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LGC 7.5-25 Ton Series

1. 33 Unit Components 36 Placement and Installation 54 II Charging EE 54 IV Start Up Operation 57 V System Service Checks 60 High Altitude exe 62 VI Maintenance 62 Vil Accessories 63 VIII Wiring and Operation Sequence 7T 1 SPECIFICATIONS LGC090S 102S General Nominal Tonnage 7 5 Ton 8 5 Ton pata Model No LGC090S2B LGC102S2B Efficiency Type Standard Standard Cooling Gross Cooling Capacity Btuh kW 96 000 28 1 106 000 31 1 Performance 1 Net Cooling Capacity Btuh kW 93 000 27 3 102 000 29 9 ARI Rated Air Flow cfm L s 3000 1415 3400 1605 3 Sound Rating Number dB 88 88 Total Unit Power kW 9 0 9 9 1 EER Btuh Watt 10 3 10 3 2 Integrated Part Load Value Btuh Watt 10 8 10 4 Refrigerant Charge Furnished R 22 Circuit 1 6 Ibs 0 oz 2 72 kg 6 Ibs 0 oz 2 72 kg Circuit 2 6 Ibs 0 oz 2 72 kg 6 Ibs 0 oz 2 72 kg Refrigerant Charge Furnished R 410A Circuit 1 Not Available Not Available Circuit 2 Not Available Not Available Refrigerant Charge Furnished R 22 Circuit 1 Not Available Not Available w Humiditrol Option Circuit 2 Not Available Not Available Gas Heating Two Stage Heat Input Type Standard Medium Standard Medium High Performance Input Btuh kW First Stage 84 500 24 8
2. DIE OPTIONAL ACCESSORIES LGC156 300 OPTIONs ACCESSORIES Item Catalog 156 180 210 240 300 No COOLING SYSTEM Condensate Drain Trap PVC LTACDKP09 36 76M18 9 9 9 0 Copper LTACDKC09 36 76 19 9 9 9 Corrosion Protection Factory O Efficiency Standard Factory O O O High Factory O O O Refrigerant Type R 22 Factory O O O O R 410A Factory O O O O Service Valves not for Humiditrol Units Factory O O Stainless Steel Condensate Drain Pan Factory O O HEATING SYSTEM Combustion Air Intake Extensions LTACAIK10 15 89197 1 x 1 1 Gas Input Low 169 kBtuh input Factory O Standard 260 kBtuh input Factory O O O Medium 360 kBtuh input Factory O O High 480 kBtuh input Factory O Low Temperature Vestibule Heater Factory O O LPG Propane 169 kBtuh input order 1 kit LTALPGK 130 72M94 1 x 1 Conversion Kits 260 kBtuh input order 2 kits LTALPGK 130 72 94 x 1 1 1x 360 kBtuh input order 2 kits LTALPGK 180 72 95 1 1 1 1 1 480 kBtuh input order 2 kits LTALPGK 240 72 96 1x OE Cx Side Gas Piping Kit C1GPKTO1C 85 31 x Stainless Steel Heat Exchanger Factory O o Vertical Vent Extension LTAWEK10 15 73 72 1 1 1 1 1x
3. LENNOX Service Literature UNIT INFORMATION LGC SERIES Corp 0224 L7 M Revised 01 2009 26 3 to 88 kW LGCO090S through 3005 The LGC090S 1025 1205 1505 150H 156H 1805 180H 2105 210 2405 and 3005 LGC090S 300S units are configure to order units CTO with a wide selection of factory installed options LGCO90S 1025 1205 and 1505 units are available in 130 000 180 000 Btuh or 240 000 Btuh 38 1 52 7 or 68 9 kW heating inputs LGC180S 180H 2105 210H 2405 and 3005 units are available in 260 000 360 000 or 470 00 Btuh 76 2 105 5 or 137 7 kW heating inputs The LGC1808 180H 2105 and 210H also has an optional single stage heat in 169 000 Btuh 49 5 kW LGC156H is available in 260 000 Btuh or 360 000 Btuh 76 2 or 105 5 kW and has the option for single stage heat in 169 000 Btuh 49 5 kW Gas heat sections are designed with Lennox aluminized steel tube heat exchangers with stainless steel as an option AWARNING Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must be performed by a qualified installer or service agency Cooling capacities range from 7 5 to 25 tons 26 3 to 88 kW LGCO90S 1025 1205 and 150H utilizes two compressors while the LGC156H 180S and 180H utilizes three compres sors and LGC210S 210H 2405 and 3005 utilizes four com pressors Units are also designe
4. 5 hp 4 kit 2 685 865 rpm kit 3 850 1045 rpm kit 4 945 1185 rpm 7 5 hp kit 5 945 1185 rpm kit 6 1045 1285 rpm kit 7 850 1045 rpm 2 15 x 15 in 381 x 381 mm Disposable 6 24 x 24 x 2 610 x 610 x 51 Electrical characteristics 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum external duct static pressure 2 Integrated Part Load Value tested at 80 F 27 C outdoor air temperature Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Kit 2 is used with high efficiency 3 HP motor only Page 6 SPECIFICATIONS LGC210H General Nominal Tonnage Model No Efficiency Type Gross Cooling Capacity Btuh kW 1 Net Cooling Capacity Btuh kW ARI Rated Air Flow cfm L s Total Unit Power kW 1 EER Btuh Watt
5. Unit only 92 100 106 41 Ampacity with power exhaust 97 105 EST 43 Disconnect 84 13 20 TON HIGH EFFICIENCY R 22 LGA240H2 Voltage 60hz 3 phase 208 230V 460V 575V Compressors Rated Load Amps total 17 3 69 2 9 36 1 1 28 4 4 Locked Rotor Amps total 123 492 62 248 50 200 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 6 2 1 4 Motors 4 Locked Rotor Amps total 4 7 188 24 9 6 1 9 76 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 24 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 4 8 19 88 Service 1159 GFI 75 Amps Indoor Blower Horsepower 5 7 5 10 5 7 5 10 5 7 5 10 Motor Rated Load Amps 167 242 308 76 11 14 6 1 9 11 Locked Rotor Amps 105 152 193 456 66 84 36 6 54 66 2 Maximum Unit only 110 125 125 60 60 70 45 50 50 GE with power exhaust 110 125 150 60 60 70 45 50 50 T Minimum Circuit Unit only 100 108 114 52 55 58 41 44 46 with power exhaust 105 113 119 54 58 61 43 46 48 Disconnect Dm 20 HIGH 410 LGA240H4 Voltage 60hz 3 phase 208 230V 460V 575V Compressors Rated Load Amps total 16 64 7 8 31 2 5 7 22 8 Locked Rotor Amps total 110 440 52 208 38 9 155 6 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 6 2 1 4 Motors 4 Locked Rotor Amps total 4 7 18 8 24 9 6 1 9 7 6 Standard Power Horsepower W 1 3 249 1 3 249 1 3 24
6. RPM ADJUSTABLE SHEAVE FIXED SHEAVE BELTS SPLIT BUSHING Drive Min Max Supplier No OEM Supplier No OEM Part No Supplier OEM Supplier No OEM No Part No No Part No Part No SC 50 8 1045 1VP65x1 1 8 100239 03 BK110H 100788 06 97J5901 H 1 7 1 49M6201 6 945 1185 1VP60x1 1 8 4101301 BK90H x 1 7 16 100788 04 57 7701 1 7 16 49 6201 50 8 1045 1VP65x1 3 8 78 7101 BK110H 100788 06 97J5901 49M6201 1135 1365 1VP62x1 3 8 78M7001 BK80H 100788 03 57A7701 49M6201 Two belts required per unit Page 32 LGC PARTS ARRANGEMENT 7 5 to 12 5 ton CONDENSER FAN EVAPORATOR COIL SS CONTROL BOX BLOWER ECONOMIZER IN BLOWER MOTOR ER 4 gt MEC S y RY gt by ai 5 E t E CONDENSER COIL COMPRESSORS Le COMBUSTION AIR INDUCER BURNERS FIGURE 1 LGC PARTS ARRANGEMENT 13 to 25 ton EVAPORATOR COIL S CONDENSER FANS ECONOMIZER BLOWER CONDENSER COILS COMPRESSORS BURNERS COMBUSTION AIR INDUCER FIGURE 2 Page 33 ve 102 120 150 CONTROL BOX PARTS ARRANGEMENT Economizer Compressor 2 Module A56 Module A57 CAL Relay K13 Power Exhaust Relay Main Control Module A55 Termina
7. ft m Diffuser Model RTD11 185 FD11 185 28 37 9 11 29 38 9 12 Kc 40 50 12 15 42 51 13 16 53 52 13 16 45 56 14 17 Diffuser Model RTD11 275 FD11 275 26 35 8 11 28 37 9 11 29 38 9 12 40 50 12 15 3008 42 51 13 16 43 52 13 16 44 54 13 17 46 57 14 17 48 59 15 18 1 Throw is the horizontal or vertical distance an airstream travels on leaving the outlet or diffuser before the maximum velocity is reduced to 50 ft 15 m per minute Four sides open Page 31 FACTORY INSTALLED BELT DRIVE SPECIFICATIONS Model No Motor Efficiency Nominal Maximum Nominal Maximum Drive Kit RPM Range p p kW kw Number 156 Standard or High 15 17 535 725 156 thru 210 Standard 3 hp 3 45 22 2 6 535 725 1 685 865 High 2 2 2 6 2 685 865 156H thru 300S Standard or High 3 7 4 3 2 685 865 3 850 1045 4 945 1185 180 thru 300S Standard or High 5 945 1185 6 1045 1285 7 850 1045 240 thru 300S Standard or High 6 1045 1285 8 1135 1365 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT WITH STANDARD GAS HEAT WET INDOOR COIL amp AIR FIL TERS IN PLACE FOR ALL UNITS ADD 1 Any factory installed options air resistance high gas heat economizer See table below 2 Any field installed accessories air resistance duct resistance diffuser etc See page Page 30 Then determine from table the blower motor output and drive required MANUFACTURER S NUMBERS DRIVE COMPONENTS
8. 11 2758 13 64 Flush Order 011 185 29610 x Canada Only FD11 150 180S 13 58 x FD11 275 R 29611 Canada Only 011 275 13 59 Transitions Supply and Return Order LASRT18 19 01 x Canada Only LASRT18S 33 48 LASRT21 24 19 02 Canada Only 21 248 33 49 NOTE The catalog and model numbers that appear here are for ordering field installed accessories only Field Installed or Configure to Order factory installed X Field Installed Configure to Order Factory Installed Standard Efficiency Models Only H Configure to Order Factory Installed High Efficiency Models Only Page 13 ELECTRICAL DATA LGC090 120 Model No LGCO090S Line voltage data 60 Hz 3 phase 208 230V 460 575 Compressors Rated load amps each total 12 8 25 6 6 4 12 8 5 1 10 2 2 Locked rotor amps each total 91 182 46 92 37 74 Condenser Number of motors 2 2 2 Fan Motor Full load amps each total 2 4 4 8 1 3 2 6 1 0 2 0 Locked rotor amps each total 4 7 9 4 2 4 4 8 1 9 3 8 Evaporator Motor Output hp 2 3 5 2 3 5 2 3 5 Bower kw 15 2 2 3 7 1 5 2 2 3 7 1 5 2 2 3 7 Full load amps 7 5 10 6 16 7 3 4 4 8 7 6 2 7 3 9 6 1 Locked rotor amps 46 9 66 105 20 4 26 8 45 6 16 2 23 4 36 6 T Maximum Overcurrent With ExhaustFan 50 50 70 25 25
9. 5000 5250 5500 5750 6000 Page 22 AIR RESISTANCE CEILING DIFFUSERS RTD11 Step Down Diffuser 11 Flush got 2 Ende Open 1 Side 2 Ends Open ee Diffuser Pa Pa 35 4 42 50 090 62 Models 77 97 92 3600 1700 0 36 90 0 28 70 0 23 0 15 37 ow 45 m ow s ow 4000 1890 0 44 109 0 36 90 0 29 0 21 52 Lm ow ow om e om 4600 2170 060 149 0 49 122 0 42 104 0 31 77 4800 2265 0565 162 0 53 132 0 46 114 0 35 87 5000 2360 0 69 172 0 58 144 0 50 124 0 39 97 5200 2455 0 75 186 0 62 154 0 54 134 0 43 107 4200 1980 022 55 0 19 47 0 16 40 0 10 25 5 4600 2170 0 34 85 0 29 72 0 24 60 0 15 37 150 Models 5000 2360 0 46 114 0 39 97 0 34 85 0 23 57 5400 2550 058 144 0 49 122 0 43 107 0 31 77 5600 2645 0 64 159 0 54 134 0 47 117 0 35 87 5800 2735 0 70 174 0 59 147 0 51 127 0 39 97 37 5 52 62 80 3600 1700 0 61 152 0 54 134 0 48 119 0 44 109 57 65 72 82 92 Page 23 BLOWER DATA Model No 090 102 120 150 CEILING DIFFUSER AIR THROW DATA 1Effective Throw Range Air Volume cfm 5600 5800 6000 6200 6400 6600 L s 2645 2740 2830 2925 3020 3115 RTD11 Step Down 39 49 42 51 44 54 45 55 46 55 47 56 12 15 13 16 13 17 14 17 14 17 14 17 FD11 Flush m 6 7 6 9 6 9 7 9 7 9 7 9 7 9 7 10 8 11 9 11
10. 7 1 3 9 0 5 7 1 3 9 0 5 5 Recheck voltage and amp draw with unit running If voltage is not within range listed on unit nameplate stop unit and consult power company Refer to unit nameplate for maximum rated load amps 6 Inspect and adjust blower belt see section on Blower Compartment Blower Belt Adjustment B Cooling Startup See figure 26 for circuits NOTE Crankcase heaters must be energized 24 hours be fore attempting to start compressor Set thermostat so that there is no demand to prevent compressor from cycling Apply power to unit LGC090 150 1 Initiate first and second stage cooling demande cording to instructions provided with thermostat 2 First stage thermostat demand will energize compres sor 1 Second stage thermostat demand will energize compressor 2 3 Units contain two refrigerant circuits or stages 4 Each refrigerant circuit is separately charged with re frigerant See unit rating plate for correct amount of charge LGC156 300 1 Initiate first and second stage cooling demands ac cording to instructions provided with thermostat 2 First stage thermostat demand will energize compres sors 1 and 2 on all units Second stage thermostat de mand will energize compressor 3 on all units and com pressor 4 on LGC210 300 3 Units contain two refrigerant circuits or stages 4 Each refrigerant circuit is separately charged with re frigerant See unit rating plate f
11. COMP 2 SWITCH LOW PRESS LOW AMB COMP 5 585 587 SWITCH LOW PRESS COMP S88 SWITCH LOW PRESS COMP 2 S94 SWITCH LOW PRESS LOW 4 3 595 SWITCH FREEZESTAT COMP 4 596 SWITCH HIGH PRESS COMP 4 597 SWITCH LOW PRESS 4 598 SWITCH LOW PRESS COMP 5 4 WARNING gt ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES DISCONNECT ALL POWER BEFORE SERVICING IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT NOTE FOR USE WITH COPPER CONDUCTORS ONLY 24V COMMON MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AND INSULATION THICKNESS THERMOSTAT HEAT ANTICIPATION SETTING 0 1 AMP DESCRIPTION AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE KEY COMPONENT DENOTES OPTIONAL COMPONENTS LINE VOLTAGE FIELD INSTALLED NEC CEC CLASS GLI7 ISWITCH GFI TI TRANSFORMER GONTROL NOTE ALL REMAINING WIRES FACTORY INSTALLED 9935 Ai EQUIPMENT GROUND 120 1 60 GROUND NOTE USE COPPER CONDUCTORS ONLY 120V FIELD PROVIDED POWER SUPPLY IS REQUIRED WHEN T29 IS NOT PROVIDED 129 TRANSFORMER GFI TBIS TERMINAL STRIP POWER DISTRIBUTIO 1854 TERMINAL STRIP TRANS TI 1B35 TERMIN
12. COMPONENT COMPONENT PANEL MAIN CAPACITOR OUTDOOR FAN 4 PANEL ECONOMIZER CIRCUIT BREAKER TRANS TI PANEL COMPRESSOR 2 CIRCUIT BREAKER TRANS PANEL COMPRESSOR 3 amp 4 FUSE EXHAUST FAN COMPRESSOR T FUSE OUTDOOR FAN MOTOR FUSE TRANS 729 PRIMARY lt MOTOR BLOWER FUSE TRANS 129 SECONDARY 120 1 60 MOTOR OUTDOOR FAN HEATER COMPRESSOR MOTOR OUTDOOR FAN HEATER COMPRESSOR 2 MOTOR EXHAUST FAN HEATER COMPRESSOR 3 aH MOTOR EXHAUST FAN JACK GFI RECEPTACLE SE Een JEE NOTE USE COPPER JACK EXHAUST FAN MOTOR OUTDOOR FAN JACK TEST HEAT E CI CAPACITOR OUTDOOR JACK TEST COOL CAPACITOR OUTDOOR JACK QUTDOOR FAN END CAPACITOR EXHAUST JACK OUTDOOR FAN 2 SAD Ren WHEN 726 CAPACI TOR OUTDOOR JACK BLOWER DECK IS NOT PROVIDED CAPACI TOR QUTDOOR JACK MOTOR OUTDOOR FAN 3 DESCRIPTION COMPONENT JACK MOTOR OUTDOOR FAN 4 WIRING DIAGRAM 2 03 JACK GAS QUTPUT JACK COOLING SENSOR INPUT COMBINATION PACKAGED ROOF TOP JACK BLOWER 4 COOL CONT OUTPUT LCA LGA 156 180 6 J M Y JACK COMPRESSOR 2 JACK COMP 3 4 4 CONTROL LCC L6C 156 180 6 J M Y JACK COMP 3 amp 4 INPUT JACK BLOWER EXHAUST HEAT COOL SECTION B6 JACK BIl EXHAUST FAN MOTOR Supersedes Form No New Form No E FAN S 533 903W 534 559 1 0
13. ELECTRICAL DATA 13 TON 13 TON HIGH EFFICIENCY R 22 LGC156H2 Voltage 60hz 3 phase 575 Compressors Rated Load Amps total 147 44 1 71 213 5 1 153 3 Locked Rotor Amps total 91 273 50 150 37 111 Outdoor Fan Full Load Amps total 2A 96 1 3 52 Moters 4 Locked Rotor Amps total 47 188 19 7 6 Standard Power Horsepower W 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 24 48 3 2 1 2 Locked Rotor Amps total 4 7 9 4 1 9 3 8 Service Outlet 115V 15 15 ae 3 15 Amps Indoor Blower Horsepower 3 5 Motor Rated Load Amps 75 106 16 7 3 4 4 8 7 6 27 3 9 6 1 Locked Rotor Amps 46 9 20 4 26 8 45 6 16 2 23 4 36 6 Maximum Unit only 25 30 Overcurrent Protection with power exhaust 80 80 90 40 40 45 30 30 5 Minimum Circuit Unit only 65 68 75 32 34 36 24 25 27 Disconnect 84 13 84M14 84M13 84M13 13 TON HIGH EFFICIENCY R 410A LGC156H4 Voltage 60hz 3 phase 208 230V 460 575 Compressors Rated Load Amps total 17 9 53 7 7 9 23 7 6 2 18 6 3 Locked Rotor Amps total 91 273 46 138 37 111 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 5 2 1 4 Motors 4 Locked Rotor Amps total 4 7 188 24 9 6 19 76 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 24 4 8 1 3 2 6 1 Locked Rotor Amps total 4 7 9 4 2 4 4 8 1 9 3 8 Service Outlet 115 15 MINES 15 GE 15 Amp
14. po NN nr 525 14 59 145 TABLE 22 LGC150H R410A Std amp Humiditrol Outdoor CIRCUIT 1 CIRCUIT 2 Air Temp psig psig psig psig 129 pase 133 105 469 139 461 139 1156 521 143 513 TABLE 23 LGC156H R410A Std amp Humiditrol CIRCUIT 1 CIRCUIT 2 CIRCUIT 3 Outdoor Coil Dis Dis Suc Dis Suc Entering 10 10 5 10 5 Air Temp Psig pslg psig psig psig 246 158 276 279 28 146 414 418 150 468 472 152 CS Der pepe pepe we aer 361 44 1159F 137 0 5 6 150 56 TABLE 24 LGC180H R410A Std and with Humiditrol Outdoor Coil En tering Air Temp TABLE 25 LGC180H 3 R410A Std and with Humiditrol Outdoor Coil En tering Air Temp 2 136 EN E 138 EM TABLE 26 KEE R41 Std amp Humiditrol RCU RCUIT 4 Outdoor i Suc Dis pos tering 10 Air Temp psig TABLE 27 LGC300S4 R410A Std amp Humiditrol Outdoor Coil En tering B Charge Verification Approach Method 8 Using the same thermometer compare liquid temper ature to outdoor ambient temperature Approach Tem perature Liquid temperature minus ambient temper ature 9 Approach temperature should match values in tables 28 or 29 An approach temperature greater than value shown indicates an underch
15. 11 Ibs 12 oz 5 33 kg 14 Ibs 0 oz 6 35 kg 13 Ibs 0 oz 5 90 kg 14 Ibs 0 oz 6 35 11 Ibs 8 oz 5 22 9 Not Available 13 Ibs 8 oz 6 12 kg 14 Ibs 8 oz 6 58 kg 13 Ibs 0 oz 5 90 9 Not Available 17 Ibs 8 oz 5 22 kg 14 Ibs 0 oz 6 35 Ka 11 Ibs 8 oz 5 22 9 Standard Medium High 84 500 24 8 117 000 34 3 156 000 45 7 84 500 24 8 117 000 34 3 156 000 45 7 130 000 38 1 180 000 52 7 240 000 70 3 1130 000 38 1 1180 000 52 7 240 000 70 3 104 000 30 5 144 000 42 2 192 000 56 3 104 000 30 5 144 000 42 2 192 000 56 3 80 0 80 0 3 4 in NPT 3 4 in NPT 7 in w c 1 7 kPa 7 in w c 1 7 kPa 11 in w c 2 7 kPa 11 in w c 2 7 kPa Compressor Type No Scroll 2 Scroll 2 Condenser Net face area sq ft m 29 3 2 72 total 26 6 2 47 total Coil Tube diameter in mm 3 8 9 5 3 8 9 5 Number of rows 2 3 Fins per inch m 20 787 20 787 Condenser Motor horsepower W 2 1 3 249 2 1 2 372 Fans Motor rpm 1075 1075 Total Motor watts 700 1150 Diameter in mm no of blades 2 24 610 3 2 24 610 3 Total air volume cfm L s 8 000 3775 9 000 4245 Evaporator Net face area sq ft m2 10 5 0 98 total 10 5 0 98 total Coil Tube diameter in No of rows 3 8 9 5 A 3 8 9 5 4 Fins per inch m 14 551 14 551 Drain connection no amp size 1 1 in NPT coupling 1 1 in NPT coupli
16. 1185 rpm 7 5 hp kittt 5 945 1185 rpm kit 6 1045 1285 rpm kit 7 850 1045 rpm Blower wheel nominal diameter x width 2 15 x 15 in 381 x 381 mm Filters Type of filter Disposable 6 24 x 24 x 2 610 x 610 x 51 Electrical characteristics 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum external duct static pressure 2 Integrated Part Load Value tested at 80 F 27 C outdoor air temperature 3 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Kit 2 is used with high efficiency HP motor only Page 8 SPECIFICATIONS LGC240S amp LGC300S General Nominal Tonnage Data Model No Efficiency Type Gross Cooling Capacity Btuh kW Net Cooling Capacity Btuh kW Total Unit Power kW ARI Rated Air Flow cfm L s EER Btuh
17. See table below 2 Any field installed accessories air resistance duct resistance diffuser etc See page Page 30 Then determine from table the blower motor output and drive required 0 00 to 1 00 in w g LGC300S Air External Static in w g Volume cfm 0 00 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 1 00 8500 10750 11500 915 7 40 948 7 88 980 8 35 1010 8 80 1040 9 25 1068 9 68 1095 10 10 1118 10 53 1140 10 95 1165 11 40 1190 11 85 NOTE italics field furnished 1 10 to 2 20 in w g LGC300S Air External Static in w g Volume 449 1 20 1 30 1 40 1 50 1 60 1 70 1 80 1 90 2 00 240 2 20 RPM RPM RPM RPM RPM RPM RPM RPM RPM BHP Standard Static 10 HP 8000 1065 6 40 11090 6 70 1115 6 98 1140 7 25 1163 7 55 1185 7 85 1208 8 13 1230 8 40 1253 8 70 1275 9 00 1295 9 30 1315 9 60 8500 1085 7 10 1110 7 40 1135 7 73 1160 8 05 1183 8 35 1205 8 65 1228 8 95 1250 9 25 1270 9 55 1290 9 85 1310 10 15 1330 10 45 10000 1145 9 43 1170 9 80 1193 10 1511215 10 50 1238 10 88 1260 11 25 1283 11 62 ES 11500 1210 1223 1230 1260 NOTE italics field furnished AIR RESISTANCE in w g Factory or Field Installed Options Gas Heat Exchanger Med Heat High Heat Roof Curb MERV 11 MERV
18. The GLO or global mode is used with an energy management system which includes a global con trol feature Global control is used when multiple units in one location respond to a single outdoor air sensor Each energy management system uses a specific type of out door sensor which is installed and wired by the controls contractor Motorized Outdoor Air Damper The GLO mode is also used when a motorized outdoor air damper is installed in the system NOTE All economizer modes of operation will mod ulate dampers to 55 F 13 C supply air F LAGED H Gravity Exhaust Dampers all units LAGED H 10 15 dampers figure 34 available for LGC0908 1508 and LAGED H 18 24 dampers figure 35 available for LGC 156H 300S units are used in down flow and LAGEDH are used in horizontal air discharge applications LAGED H gravity exhaust dampers are installed in the return air plenum The dampers must be used any time an economizer or power exhaust fans are applied to LGC series units Gravity exhaust dampers allow exhaust air to be discharged from the system when an economizer and or power exhaust is operating Gravity exhaust dampers also prevent outdoor air infiltration during unit off cycle See installation instructions for more detail LAGED AND LAPEF INSTALLATION ECONOMIZER FRESH AIR GRAVITY EXHAUST 2 LAPEF 77 POWER EXHAUST FAN ASSEMBLY LAGED GRAVITY EXHAUST DAMPERS FIGURE 34
19. cooling ECTO 5 04 option 2 and 6 01 option 0 Three stages of cooling is available in zone sensor mode ECTO 6 01 set to option 1 2 or 3 Three stages of cooling is also available by installing a transfer relay and a three stage thermostat ECTO 5 04 must be set to option 3 Refer to the Main Control Operation section in the IMC manual when using the transfer relay Four stages of cooling is available in zone sensor mode ECTO 6 01 set to option 1 2 or 3 on units with four compres sors C210 240 300 Compressors are not de energized when unit operation changes from cooling to reheat or from reheat to cooling Instead L14 and L30 reheat valves are energized reheat or de energized cooling NOTE Another thermostat staging option is available which allows both compressors to be energized during free cooling See ECTO 5 04 option 1 in IMC manual Page 74 24 VOLT FIELD WIRING WITH IMC SET IN LOCAL THERMOSTAT MODE ECTO 6 01 OPTION 0 JUMPER TERMINALS 8 amp 9 WHEN THERMOSTAT HAS NO Note On electro mechanical ther NIGHT SETBACK TERMINALS mostats set anticipator at 0 1 amps 2345 6 819 10 111213 14 15 1617 19 2021 01112 7 O YD L 231114 954 Q V OOo NOT ALL TERMINALS ARE FOUND ON ALL THERMOSTATS ER VOUT GND O 91 HUMIDITY SENSOR Connect shield drain to unit TB1 7 Ai _ THERMOSTA FIGURE 44 24 VOLT FIELD WIRING IN ZONE SENSO
20. 1135 1365 rpm 2 15 15 in 381 381 mm Disposable 6 24 x 24 x 2 610 x 610 x 51 208 230 460 575V 60 hertz 3 phase Electrical characteristics NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction 1 Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum external duct static pressure 2 Tested at conditions included in with ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum Integrated Part Load Value tested at 80 F 27 C outdoor air temperature 4 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 9 OPTIONAL ACCESSORIES LGC090 150 The catalog and part numbers that appear here are for ordering field installed accessories only Item Factory Field 090 102 120 150 Cabinet Coil Guards gt 88K51 Grille Guards 86 29 Hail Guards gt
21. 169 000 49 5 234 000 68 6 260 000 76 2 360 000 105 5 208 000 60 9 288 000 84 4 80 0 1 in 7 in w g 1 7 kPa 11 in w g 2 7 kPa Scroll 4 56 5 5 25 3 8 9 5 20 787 4 1 3 249 1075 1395 4 24 610 15 450 7290 Low High 1 Stage 2 Stage 312 000 91 4 480 000 140 6 384 000 112 5 Net face area sq ft m7 total Tube diameter in mm No of rows Fins per inch m Condensate Drain number and size Expansion device type Evaporator Coils 22 3 2 07 3 8 9 5 14 551 1 1 in NPT coupling Balanced Port Thermostatic Expansion Valve removeable power head Indoor Blower and Drive Selection Nominal motor output Maximum usable motor output US Only Motor Drive kit number Blower wheel nom dia x width in mm Type of filter No and size in mm Electrical characteristics Filters 3hp 2 2 KW 5 hp 3 7 kW 7 5 hp 5 6 kW 3 45 hp 2 6 kW 5 75 hp 4 3 kW 8 63 hp 6 4 kW 3 hp kit HA 535 725 rpm 1 685 1045 2 685 gt 1045 rpm kit 2 685 P 865 rpm kit 3 850 865 rpm kit 4 945 1185 rpm 7 5 hp kit 5 945 1185 rpm kit 6 1045 1285 rpm kit 7 850 1045 rpm 2 15 x 15 381 x 381 Disposable 6 24 x 24 x 2 610 x 610 x 51 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not includ
22. 2 Integrated Part Load Value Btuh Watt Refrigerant Charge Circuit 1 Furnished R 22 Circuit 2 Circuit 3 Circuit 4 Circuit 1 Circuit 2 Circuit 3 Circuit 4 Heat Input Type Data Cooling Performance Cooling Refrigerant Charge Performance Furnished R 22 R410A with Humiditrol Option Gas Heating Performance Input Btuh kW First Stage Second Stage First Stage Second Stage CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural Output Btuh kW LPG Propane Compressor Type no Condenser Coils Net face area sq ft m total Tube diameter in mm No of rows Fins per inch m Motor horsepower W Motor rpm Total Motor watts Diameter in mm No of blades Total Air volume cfm L s Condenser Fans 169 000 49 5 135 000 39 6 17 5 Ton 210H2B R22 210 4 High 218 000 63 9 212 000 962 1 210 000 61 5 204 000 59 7 6600 3115 18 3 17 8 11 5 11 5 12 3 12 3 11 Ibs 0 oz 4 99 kg 12 Ibs 8 oz 5 67 11 Ibs 0 oz 4 99 kg 12 Ibs 8 oz 5 67 11 Ibs 0 oz 4 99 kg 12 Ibs 0 oz 5 44 kg 11 Ibs 0 oz 4 99 kg 12 Ibs 0 oz 5 44 kg 13 Ibs 0 5 90 kg 12 Ibs 8 oz 5 67 kg 13 Ibs 0 oz 5 90 kg 12 Ibs 8 oz 5 67 kg 11 Ibs 0 oz 4 99 kg 12 Ibs 0 oz 5 44 kg 11 Ibs 0 oz 4 99 kg 12 Ibs 0 oz 5 44 kg Standard Medium 2 Stage 2 Stage
23. 28 37 9 11 29 38 9 12 40 50 12 15 42 51 13 16 43 52 13 16 45 56 14 17 1 Throw is the horizontal or vertical distance stream travels on leaving the outlet or diffuser before the maximum velocity is reduced to 50 ft Return Air System Static Pressure in w g 0 0 05 0 10 0 15 0 20 0 25 0 30 0 35 12 25 37 50 62 75 87 POWER EXHAUST FANS PERFORMANCE cfm 4200 3970 3750 3520 3300 3080 2860 2640 Air Volume Exhausted Page 24 15 m per minute Four sides open 1 5 1980 1875 1770 1660 1560 1455 1350 1245 BLOWER DATA LGC156 300 BLOWER DATA 13 TON 0 30 to 1 40 in w g LGC156 Air External Static in w g voum 0 30 0 40 0 50 0 60 0 70 0 80 0 90 1 00 1 10 1 20 1 30 1 40 RPM RPM RPM RPM RPM BHP Low Static 2 HP Standard Static 5 HP 4400 501 057 960 275 5200 593 133 944 321 972 341 6000 630 1 75 670 1 95 710 2 15 970 3 90 998 413 6240 640 189 680 212 720 234 757 257 795 279 827 3 02 860 324 890 347 920 369 947 392 975 4 14 1002 4 37 1 50 to 2 50 w g LGC156 Air External Static in w g M 1 50 1 60 1 70 1 80 1 90 2 00 2 10 2 20 2 30 240 2 50 RPM RPM RPM RPM RPM RPM RPM RPM RPM BHP RPM BHP High S
24. 88K24 Horizontal Conversion Kit gt 56K53 Ceiling Step Down Net Weight gt RTD11 95 RTD11 135 RTD11 185 Diffusers 88 Ibs 40 kg 205 Ibs 93 kg 392 Ibs 178 kg Flush Net Weight gt FD11 95 FD11 135 FD11 185 75 Ibs 34 kg 174 Ibs 79 kg 289 Ibs 131 kg Transitions Supply and Return Net Weight gt LASRT08 10 LASRT10 12 LASRT15 30 Ibs 14 kg 32 Ibs 15 kg 36 Ibs 16 kg Controls Blower Proving Switch gt 18L89 Commercial Controls gt See Engineering Handbook Dirty Filter Switch gt 30K48 Economizer Enthalpy Control Differential gt 16K97 Economizer Enthalpy Control Outdoor gt 16K96 Economizer Control Global See Engineering Handbook sensor must be field provided Economizer Control Sensible See Engineering Handbook Humidity Sensor Kit Remote Mounted gt 17M50 Unit Controller PC Software gt 96L80 Smoke Detector Supply gt 16M24 Smoke Detector Return gt 16M23 Cooling PVC Condensate Drain Trap gt 37K70 Accessories Copper Condensate Drain Trap gt 48K14 Service Valves Factory installed option Corrosion Protection Factory installed option Economizer Economizer Net Weight gt LAREMD10 15 47 Ibs 21 Outdoor Al Down Flow Barometric Relief Dampers Net Weight gt LAGED10 15 8 Ibs 4 kg Power Horizontal Barometric Relief Dampers Net Weight gt LAGEDHO3 15 8 Ibs 4 kg Hood for Down Flow LAGED LAGEHO9 15 Power Exhaust Fan Net Weight
25. Compressor 1 2 3 amp 4 Cooling Cooling stage is initiated when zone temperature is higher than the cooling setpoint plus the appropriate stage differential ECTO 6 10 6 12 6 13 6 14 Reheat demand is initiated when relative humidity is higher than relative humidity setpoint there is no reheat demand and outdoor air is suitable free cooling will operate 2If there is reheat demand and outdoor air is suitable free cooling and compressor 1 will operate there is no reheat demand and outdoor air is suitable free cooling and compressor 1 and 2 will operate 4lf there is no reheat demand and outdoor air is suitable free cooling compressor 1 2 and 3 will operate SIf there is no reheat demand and outdoor air is suitable free cooling compressor 1 2 3 and 4 will operate The following conditions must be met before reheat will be energized default ECTO 4 24 option 6 see previous page 1 Blower must be operating 2 System must be in occupied mode 3 System must NOT be operating in heating mode Page 76 Vill Wiring Diagrams and Sequence of Operation 460V OR 575 TRANSFORMER 220 240 50 1 7 EE 380 420 90 150 UNIT DIAGRAM 24V POWER DESCRIPTION COMPONENT PANEL MAIN PANEL ECONOMI ZER PANEL COMPRESSOR 2 COMPRESSOR COMPRESSOR 2 MOTOR BLOWER MOTOR QUTDOOR FAN MOTOR OUTDOOR FAN 2
26. S59 is an auto reset SPST N C switch which opens on a temperature drop The switch is wired in series with 24v power and the combustion air blower switch When the temperature drops below 30 F 35 C the switch opens and the gas heat section is de energized The switch automati cally resets when the heating compartment tempera ture reaches 10 F 129 b Thermostat switch S60 is an auto reset SPST N C switch which opens on a temperature rise The switch is wired in series with HR6 and T20 When the temperature rises above 20 F 7 C the switch opens and the electric heater is de energized The switch automatically resets when the heating compartment temperature reaches 10 F 23 3 C c Thermostat switch S61 is an auto reset SPST switch which closes a temperature drop The switch is wired in series with HR6 and T20 When temperature drops below 20 F 7 C the switch closes and electric heater is energized The switch automatically opens when heating compartment temperature reaches 76 F 24 C Page 66 Control Systems Three different types of control systems may used with the LGC series units All thermostat wiring is connected to terminal block TB1 located in the control box of the unit Each thermostat has additional control options available See thermostat installation instructions for more detail 1 Electro mechanical thermostat 13F06 The electro mechanical thermostat is a two stage h
27. blower should still be energized 8 When check out is complete remove all jumpers set ECTO 4 25 back to the proper humidity set point and set ECTO 6 01 to the proper setting Default Reheat Operation Humiditrol unit reheat control parameter 4 24 is factory set to option 6 Reheat will operate as shown in table 13 once three conditions are met 1 Blower must be operating 2 System must be in occupied mode 3 System must NOT be operating in heating mode IMPORTANT Free cooling does not operate during re heat Free cooling will operate as shown in the IMC manu al Reheat Control Options Reheat control parameter 4 24 can be set to other reheat control operating conditions as follows see IMC manual 4 24 option 3 1 Blower must be operating 2 System must be in occupied mode 3 System must NOT be operating in heating mode 4 One cooling demand is required if the unit has been in heating mode the IMC has been reset or at initial unit start up 4 24 option 5 3 System must be operating heating mode 4 One cooling demand is required if the unit has been in heating mode the IMC has been reset or at initial unit start up ECTO 4 24 option 7 3 System must NOT be operating in heating mode Once the corresponding conditions are met in each mode reheat will operate as shown in table 13 Additional Cooling Stages Units are shipped from the factory to provide two stages of
28. gt LAPEF10 15 0 28 Ibs 13 kg Outdoor Air Hood Net Weight gt LAOAH10 15 11 Ibs 5 kg Number and Size of Filters 2 16 x 25 x 1 in 406 x 635 x 25 mm Electrical HACR Circuit Breaker Accessories Factory installed option Disconnect Switch 30M38 GFI Service Outlets 31M78 Gas Combustion Air Intake Extensions 89L97 Heating 45L78 23M91 Standard heat 98L35 High Heat Factory installed option 27M58 Factory installed option Fresh Air Tempering Kit LPG Propane Kits Stainless Steel Heat Exchanger Vertical Vent Extension Kit Accessories Humiditrol Condenser Reheat Option 090 102H 120H and 1505 Humidity Sensor Kit Remote Mounted required Indoor Air Sensor Duct Mounting Kit Quality CO2 Sensor white case CO display Sensor white case no display Sensor black case display Sensor duct mount black no display Aspiration Box for duct mounting Handheld Monitor Outdoor Damper Section down flow Automatic Net Weight Alr Damper Section down flow Manual Net Weight Dampers Outdoor Air Hood down flow LAOAH10 15 11 Ibs 5 kg Net Weight Number and Size of Filters 2 16 x 25 x 1 in 406 x 635 x 25 mm Down Flow 14 in 356 mm height Net Weight LARMF 10 15 14 126 Ibs 57 kg Curbs 24 in 610 m height Net Weight M LARMF 10 15 24 174 Ibs 79 kg Page 10 17M50 LAOADM10 15 31 Ibs 14 kg LAOAD10 15 26 Ibs 12 kg
29. 1 7500 1048 5 78 1075 6 05 1100 6 33 1125 6 60 1148 6 88 11170 7 15 1193 7 40 1215 7 65 1238 7 95 1260 8 25 1280 8 50 1300 8 75 8000 1065 6 40 1090 6 70 1115 6 98 1140 7 25 1163 7 55 1185 7 85 1208 8 13 1230 8 40 1253 8 70 1275 9 00 1295 9 30 1315 9 60 8400 1081 6 96 1106 7 26 1131 7 58 1156 7 89 1179 8 19 1201 8 49 1224 8 79 1246 9 09 1266 9 38 1286 9 67 1307 9 98 1328 10 29 Gas NOTE italics field furnished Med Heat High Heat Roof Curb MERV 11 MERV 15 5600 0 04 0 07 0 10 0 02 0 02 6500 0 05 0 09 0 02 0 13 0 02 0 03 7500 0 07 0 11 0 06 0 17 0 03 0 03 8000 0 08 0 13 0 09 0 03 AIR RESISTANCE in w g Factory or Field Installed Options Air Volume cfm Page 27 BLOWER DATA 20 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT WITH STANDARD GAS HEAT WET INDOOR COIL amp AIR FIL TERS IN PLACE FOR ALL UNITS ADD 1 Any factory installed options air resistance high gas heat economizer See table below 2 Any field installed accessories air resistance duct resistance diffuser etc See page Page 30 Then determine from table the blower motor output and drive required 0 20 to 1 20 in w g LGA LGC240 Air External Static in w g volum 5 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 1 00 1 10 1 20 RPM RPM RPM RPM B
30. 1 close energizing condenser fan B22 and N C contacts K150 2 open de energizing compressor 4 crankcase heater HR11 Page 83 GAS HEAT FOR LGA156 300 NOTE On single stage heat terminal H1 on gas valve GV1 and is not connected to terminal H2 on controls A55 and 58 gt A55 5 58 1835 11 7835 1 8 62 Gi t CGA 50C LOW AMBIENT KIT OPTIONAL S99 120 USED ON 460V AND 575V UNITS ONLY 599 IS SPST NC ON 260 BURNER USED ON 300 AND 360 UNITS A T3 4 TI3 ARE USED 575V UNITS ONLY D STO ON COMPONENT BUBNER ONTROL BURNER ALN ASB GAS ER 7 66 ___ AIR BLOWER BIS MOTOR COMBUSTION AIR BLOWER 1 7 CAPACITOR AIR BLOWER MOTOR Feo rose 506 Lov AMBIENT KIT a 6 HEATER 50 LOW AMBIENT KIT HL 5 LIMIT IS Jib JACK GAS JACK ECONOMIZER PROGRAM DESCRIPTION JACK GAS COMPONENT Wa JACK GAS 2 THERMOSTAT 35 C OPEN 30 E 0 9117 JACK GAS 2 CONTROL J216 JACK PRIMARY LIMIT I J217 JACK PRIMARY LIMIT 2 5 RELAY COMBUSTION AIR BLOWER KIS U RELAY STAGE 2 HEAT STAGE 2 HEAT Pz EE GAS PIS 6 5 4424 11 01 WIRING DIAGRAM 4 04 28 IPLUG ECONOMIZER PROGRAM Pri PLUG SEH OUTPUT COMBINATION UNIT ROOF TOP ONT GAS HEAT FOR a 2 SERIES 260 360 AND 480
31. 24 1 3 1 0 24 1 3 1 0 47 24 1 9 47 24 1 9 15 NOTE Extremes of operating range are plus and minus 10 of line voltage 1 HACR type breaker or fuse 2 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 14 ELECTRICAL DATA LGC150 Condenser Fan Motors 2 Locked rotor amps each total Full load amps each total Locked rotor amps each total 156 0 312 3 0 6 0 6 0 12 0 Model No LGC150S Line voltage data 60 Hz 3 phase 208 230V 460V Compressors Rated load amps each total 18 6 37 2 9 18 2 75 0 150 1 5 3 0 3 0 6 0 74 14 8 54 0 108 Evaporator Blower Motor Maximum Overcurrent Protection HACR type breaker or fuse Ampacity Optional Power Exhaust Fan Minimum Circuit Motor Output hp kW Full load amps Locked rotor amps With Exhaust Fan Less Exhaust Fan With Exhaust Fan Less Exhaust Fan 56 Number Horsepower W Full load amps Locked rotor amps 1 1 3 249 24 47 1 1 3 249 1 3 24 Service Outlet 2 115 volt GFCI amp rating 8Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus and minus 10 of line voltage Page 15 1 1 3 249 1 0 1 9 ELECTRICAL DATA LGC156
32. 3 9 C 40 5 4 4 C 0 5 See 9 1 12 1 TF 1 10 F 1 5 C 0 5 6 7 05 6 1 30 5 5 6 C 0 5 Sam 10 F 1 9 1 10 1 TF 1 5 6 C 0 5 5 C 0 5 5 6 0 5 6 1 40 5 pum TF 1 TF 1 TF 1 6 1 0 5 6 1 4055 6 1 40 5 6 1 0 5 156 miditrol 180H Hu em miditrol 2 2 C 0 5 4 4 C 0 5 210H Hu 5 F 1 6 F 1 8 F 1 miditrol 2 8 C 0 5 3 3 0 5 4 4 C 0 5 240H Hu 4 F 1 10 F 1 11 F 1 miditrol 2 2 C 0 5 5 6 0 5 6 1 0 5 300 8 F 1 11 F 1 11 F 1 miditrol 5 C 0 5 4 4 C 0 5 6 1 C 0 5 6 1 C 0 5 156 Std amp Humi 9 Ser s ditrol 22 C 05 180 Std amp Humi 35 205 ditrol 99 C 05 210 Std amp Humi S ds ditrol 3 30 05 300S Std amp Humi c9 05 ditrol 5 0 05 57 TABLE 29 APPROACH TEMPERATURE Liquid Temp Minus Ambient Temp 1st Stage 12 F 1 6 7 C 0 5 9 1 5 0 5 9 1 5 0 5 9 1 5 0 0 5 150 Humiditrol 8 F 1 4 4 C 0 5 2nd Stage 15 F 1 8 3 C 0 5 14 F 1 7 7 0 5 13 F 1 7 1 0 5 9 F 1 5 0 0 5 7 1 3 8 0 5 R410A 9 1 5 C 0 5 10 F 1 5 6 C 0 5 120 Humiditrol 150 Std amp Humiditrol 7 F 1 3 9 0 5 7 1 3 9 0 5
33. 30 20 20 25 Protection amps Less Exhaust Fan 50 50 60 25 25 30 20 20 25 2 Minimum Circuit With Exhaust Fan 44 47 53 22 24 26 18 19 21 Ampacity Less Exhaust Fan 42 45 51 21 22 25 17 18 20 Optional Power Number Horsepower W 1 1 3 249 1 1 3 249 1 1 3 249 Exhaust Fan Full load amps 24 1 3 1 0 Locked rotor amps 4 7 24 1 9 Service Outlet 2 115 volt GFCI amp rating 15 15 15 NOTE Extremes of operating range are plus and minus 10 of line volage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Model No LGC102S Line voltage data 60 Hz 3 phase 460V 575V Compressor Rated load amps 14 7 each 7 1 each 5 8 each Locked rotor amps 50 each 37 each Condenser Full load amps 2 4 each 1 3 each 1 0 each Evaporator Motor Output hp 3 e kW 2 2 3 7 22 Full load amps 10 6 16 7 4 8 Locked rotor amps 26 8 Recommended maximum With Exhaust Fan EX 30 35 fuse size amps Less Exhaust With Exhaust Fan Less Exhaust Fan Number Horsepower W Minimum Circuit Ampacity Optional Power Exhaust Fan Full load amps Locked rotor amps Model No Line voltage data 60 Hz 3 phase Compressors Rated load amps each total 2 Locked rotor amps each total Condenser Full load amps each total Fan Motors 2 rotor amps each total Evaporator Motor Output hp Blower kW Motor Full load amps Locked ro
34. 7 94 24 48 1 9 3 8 Outlet 115 15 15 15 Indoor Blower Horsepower hams 5 7 5 Rated Load Amps ib 6 ic 7 a h 8 6 9 5 1 9 Locked Rotor Amps 66 105 KS 8 id 6 4 2 6 54 Unit only 110 110 45 with power exhaust 50 Minimum Circuit Unit only 40 Disconnect oa NOTE Extremes of operating range are plus and minus 10 eus MM line uc 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 18 ELECTRICAL DATA LGC240 ELECTRICAL DATA 20 TON 20 TON STANDARD EFFICIENCY R 22 LGC240S2 Voltage 60hz 3 phase 20823 575V Compressors Rated Load Amps total 15 4 M49 8 B 74 e 5 9 23 6 4 Locked Rotor Amps total 59 6 238 4 49 4 197 6 Outdoor Fan Full Load Amps total 24 9 5 1 3 52 1 4 Motors 4 Locked Rotor Amps total 4 7 18 8 1 9 7 6 Standard Power Horsepower 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 24 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 4 8 1 9 3 8 Service Outlet 1159 GFI 75 Amps Indoor Blower Horsepower 7 s 10 Motor Rated Load Amps 1 11 Locked Rotor Amps 193 m 6 66 Maximum Unit only 100 125 125 50 50 50 with power exhaust 110 125 125 GE 50 Minimum
35. 9 Turn on all electrical power to appliance 10 Set thermostat to desired setting 11 The combustion air inducer will start The burners will light within 40 seconds 12 If the appliance does not light the first time gas line not fully purged it will attempt up to two more igni tions before locking out 13 If lockout occurs repeat steps 1 through 10 14 If the appliance will not operate follow the instructions Turning Off Gas to Appliance and call your service technician or gas supplier Turning Off Gas to Appliance 1 If using an electromechanical thermostat set to the lowest setting 2 Before performing any service turn off all electrical power to the appliance 3 Open or remove the heat section access panel 4 Turn the knob on the gas valve clockwise 499 to OFF Depress 36C knob slightly Do not force D Safety or Emergency Shutdown off power to the unit Page 59 V SYSTEMS SERVICE CHECKS A Heating System Service Checks All LGC units are A G A and C G A design certified with out modification Before checking piping check with gas company or au thorities having jurisdiction for local code requirements Refer to the LGC Installation Operation and Mainte nance instruction for more information GAS PIPING COMPONENTS REFER TO INSTALLATION INSTRUCTIONS GROUND JOINT UNION MANUAL MAIN SHUT OFF VALVE REFER TO LOCAL CODES CAP HERE TO ISOLATE VALVE WHEN PRESSUR
36. Blower SUPPLY AIR Constant Air Volume 2 hp Standard or High Efficiency Factory hp Standard or High Efficiency Factory 5 hp Standard or High Efficiency Factory O 7 5 hp Standard or High Efficiency Factory O 10 hp Standard or High Efficiency Factory O CABINET Coil Guards 88K52 x Grille Guards 72K78 x Hail Guards 88K25 x Horizontal Return Air Panel Kit 87 00 x CONTROLS Blower Proving Switch COSWCHO1AE1 30K49 9 9 9 09 Commercial Controls L Connection Building Automation System 8 2051 Unit Controller 71 58 9 9 9 Sectra Zoning System with Bypass Control COCTRLO4BD1L 34 42 9 0 Sectra Zoning System Single Zone Control COCTRLO3BD1L 71 59 9 Dirty Filter Switch COSWCHOOAE1 30 48 9 9 0 Fresh Air Tempering COSNDCO3AE1 45178 9 9 9 0 Smoke Detector Supply LTSASDK10 36 70K87 9 9 9 0 Smoke Detector Return LTARSDK10 30 70K86 9 9 0 NOTE The catalog and model numbers that appear here are for ordering field installed accessories only Field Installed or Configure to Order factory installed Configure to Order Factory Installed X Field Installed 1 Order two each Page 11 OPTIONs ACCESSORIES Item Catalog 1
37. Combustion Air Motor Capacitors C3 all units amp C11 LGC156H 300S The combustion air blower motors in all LGC units re quire run capacitors Capacitor C3 is connected to com bustion air blower B6 and C11 is connected to combus tion air blower B15 Both capacitors are rated at 3 MFD and 370VAC 10 Gas Valves GV1 all units amp GV3 LGC156 300 Gas valves GV1 and GV3 are identical The gas valves are two stage redundant valves Units are equipped with valves manufactured by White Rodgers or Honeywell On both valves first stage low fire is quick opening on and off in less than 3 seconds On the White Rodgers valve second stage is slow opening on to high fire pressure in 40 seconds and off to low fire pressure in 30 seconds On the Honeywell second stage is quick opening On a call for first stage heat low fire the valve is energized by the ignition control simultaneously with the spark electrode On a call for second stage heat high fire the second stage operator is energized directly from A55 GV1 and 58 GV3 The White Rodgers valve is adjustable for high fire only Low fire is not adjustable The Honeywell valve is adjustable for both low fire and high fire A manual Page 52 shut off knob is provided on the valve for shut off Manual shut off knob immediately closes both stages without delay Figure 23 shows gas valve components Table 3 shows factory gas valve regulation for LGC series units Optional fact
38. IMPORTANT Align top edges of blower motor base and mounting frame base parallel before tightening two bolts on the other side of base Motor shaft and blower shaft must be parallel 4 Tighten two bolts on other side of base TO INCREASE CFM LOOSEN ALLEN SCREW amp TURN PULLEY CLOCKWISE TO DECREASE CFM TURN PULLEY COUNTERCLOCKWISE BELT TENSION ADJUSTING BOLT TURN CLOCKWISE TO TIGHTEN BELT REMOVE SCREWS FROM BOTH SIDES BEFORE SLIDING BLOWER ASSEMBLY OUT OF UNIT FIGURE 13 BLOWER MAY NEED TO BE REMOVED TO INSPECT HEAT EXCHANGER REAR BLOWER BEARINGS ETC BLOWER ASSEMBLY SLIDING BASE LOOSEN 4 SCREWS TO ADJUST BELT TENSION TO INCREASE AIR VOLUME LOOSEN ALLEN SCREW amp TURN PULLEY CLOCKWISE TO DECREASE AIR VOLUME TURN PULLEY COUNTERCLOCKWISE BLOWER ASSEMBLY LGC156 300 BELT ADJ TO INCREASE BELT TENSION 1 Loosen four screws securing blower mo tor to sliding base 2 Turn adjusting screw to the left or coun terclockwise to move the motor down ward and tighten the belt TENSION 3 Tighten four screws USTING SCREW MOTOR gt LZ PULLEY FIGURE 14 Page 47 7 2 SCREW E BLOWER WHEEL BRACKET REMOVE SCREWS TO SLIDE BLOWER ASSEMBLY OUT OF UNIT LGC 1 HEAT EXCHANGER COMBUSTION AIR INDUCER MOTOR B6 HEAT EXCHANGER SUPPORT COMBUSTION AIR INDUCER CAPACITOR C3 FLAME ROLLOUT LIMIT S47 IGNITOR ELECTRODE HEAT EXCHAN
39. MOTOR EXHAUST FAN 1 CAPACITOR QUTDOOR FAN CAPACITOR OUTDOOR FAN 2 CAPACITOR EXHAUST FAN MITTS 01420111 CIRCUIT BREAKER TRANS Tl ANPLIS PLI4APIL TUN A55 DESCRIPTION PONENT COM HEATER COMPRESSOR HEATER COMPRESSOR 2 JACK GFI RECEPTACLE JACK EXHAUST FAN COMPT JACK EXHAUST FAN JACK TEST HEAT JACK OUTDOOR FAN JACK OUTDOOR FAN 2 JACK BLOWER DECK JACK GAS OUTPUT Q JACK COOLING SENSOR INPUT JACK BLOWER 4 COOL CONTROL JACK SENSOR INPUT JACK ECONOMIZER OUTPUT JACK COMPRESSOR 2 JACK BIO EXHAUST FAN MOTOR CONTACTOR COMPRESSOR CONTACTOR COMPRESSOR 2 CONTACTOR BLOWER RELAY OUTDOOR FAN 65 1 2 5 FAN K68 1 RELAY OUTDOOR FAN 2 EIS PLUG EXHAUST FAN P24 PLUG EXHAUST FAN P35 PLUG TEST HEAT P47 PLUG OUTDOOR FAN P52 PLUG OUTDOOR FAN 2 PLUG BLOWER DECK PIII PLUG GAS OUTPUT 12 PLUG COOLING SENSOR INPUT 13 PLUG BLOWER 4 COOL I CONTROL 114 PLUG SENSOR INPUT 115 PLUG ECONOMIZER OUTPUT PIIG PLUG COMPRESSOR 2 P132 PLUG BIO EXHAUST FAN MOTOR S4 SWITCH LIMIT HI 5 S7 SWITCH LIMIT HI PRESS COMP 2 SII SWITCH LOW PRESS LOW AMB KIT 542 OVERLOAD RELAY BLOWER
40. Motor Rating Plate Actual Indoor Blower Motor Rating Plate Actual Page 62 VII ACCESSORIES The accessories section describes the application of most of the optional accessories which can be factory or field installed to the LGC units A LARMF and LARMFH Mounting Frames LGC090 150 When installing either the LGC units on a combustible surface for downflow discharge applications the Lennox LARMF 10 15 14 inch or 24 inch 356 mm or 610mm height roof mounting frame is used The roof mounting frames are recommended in all other applications but not required If the LGC units are not mounted on a flat roof surface they MUST be supported un der all edges and under the middle of the unit to prevent sag ging The units MUST be mounted level within 1 16 per linear foot or 5mm per meter in any direction The assembled LARMF mounting frame is shown in figure 30 Refer to the roof mounting frame installation instructions for details of proper assembly and mounting The roof mounting frame MUST be squared to the roof and level before mount ing Plenum system MUST be installed before the unit is set on the mounting frame Typical roof curbing and flashing is shown in figure 32 Refer to the roof mounting frame installation in structions for proper plenum construction and attachment ASSEMBLED ROOF MOUNTING FRAME LGC090 150 NN 2 SUPPLY AIR CROSS SUPPORT FIGURE 30 LGC156 300 When installing eith
41. ROUTING s OUTDOOR AIR STAGE 2 EVAPORATOR TWO SOANS Sa FANS EXPANSION VALVE 1 Ht STAGE 1 CONDENSER STAGE 1 COMPRESSOR COMPRESSOR FIGURE 36 COOLING MODE REFRIGERANT ROUTING RETURN STAGE 2 EVAPORATOR OUTDOOR AIR TWO WEE STAGE 1 gt EVAPORATOR 2 N EXPANSION VALVE SUPPLY AIR REHEAT VALVE gt 5 1 COMPRESSOR STAGE 2 COMPRESSOR FIGURE 37 Page 68 67 1 BOARD LOCATION ON 1 BOARD ASS M1 Resa eS 2 4234 56 57 a eee 21 YELLOW LED INDICATES OUTPUT L14 REHEAT VALVE A67 RH1 REHEAT CONTROL BOARD A67 RH1 a L d P175 HUMIDITROL FLASHING GREEN HEARTBEAT LED INDICATES NORMAL OPERATION 00000000 JO FIGURE 38 L14 Reheat Coil Solenoid Valve When IMC board input P114 10 indicates room condi tions require dehumidification L14 reheat valve is ener gized RH1 board P175 3 and refrigerant is routed to the reheat coil RH1 Humiditrol Board The RH1 add on board is factory installed in all Humiditrol units RH1 is located on the M1 board as shown in figure 38 Reheat Setpoint Reheat is factory set to energize when indoor relative hu midity rises above 60 default The reheat setpoint can be adjusted by changing ECTO 4 25 A setting of 100 will operate reheat from an energy management system digital output The reheat setpoint can al
42. Switches 587 8 S88 all units 98 LGC156 300 S97 LGC210 300 The low pressure switch is an auto reset SPST N O switch held N C by refrigerant pressure which opens on a pres sure drop All units are equipped with this switch The switch is located in the compressor suction line 587 compressor one S88 compressor two 598 com pressor three and S97 compressor four are wired in se ries with the main control module A55 The main control module 55 governs the low pressure switches by shunting the switches during start up until pres sure is stabilized After the shunt period the control has a three strike counter during first thermostat demand before the compressor is locked out The control is reset by breaking and remaking the thermostat demand or manually resetting the control Units charged with R22 When suction pressure drops to 25 5 psig 172 34 kPa indicating low pressure the switch opens and the compressor is de energized The switch automatically resets when pressure in the suction line rises to 55 5 psig 379 34 kPa due to many causes such as refrig erant being added Units charged with R410A When suction pressure drops to 40 5 psig 276 34 kPa indicating low pressure the switch opens and the compressor is de energized The switch automatically resets when pressure in the suction line rises to 90 5 psig 620 34 kPa due to many causes such as refriger ant being added 6 S
43. Type no 17 5 Ton LGC210S2B Standard 212 000 62 1 204 000 59 8 6800 3210 20 4 10 0 10 5 7 165 0 oz 3 18 kg 7 Ibs 0 oz 3 18 kg 7 Ibs 0 oz 3 18 kg 7 Ibs 0 oz 3 18 kg Low Standard Medium High 1 Stage 2 Stage 2 Stage 2 Stage 169 000 49 5 169 000 49 5 234 000 68 6 312 000 91 4 260 000 76 2 360 000 105 5 480 000 140 6 208 000 60 9 288 000 84 4 80 096 1 in 7 in w g 1 7 kPa 11 in w g 2 7 kPa 384 000 112 5 No and size in mm Condenser Net face area sq ft m total 56 5 5 25 Coils Tube diameter in mm 3 8 9 5 Number of rows 1 Fins per inch m 20 787 Condenser Motor horsepower W 4 1 3 249 Fans Motor rpm 1075 Total Motor watts 1370 Diameter in mm 4 24 610 No of blades 3 Total Air volume cfm L s 15 850 7480 Evaporator Net face area sq ft m total 22 3 2 07 Coils Tube diameter in mm 3 8 9 5 No of rows 3 Fins per inch m 14 551 Drain connection number and size 1 1 in NPT coupling Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head 3 Indoor Nominal motor output z hp 87 KW Blower and Drive 7 5 hp 5 6 kW Selection Maximum usable motor output 3 45 hp 2 6 kW US Only 5 75 hp 4 3 kW 8 63 hp 6 4 kW Motor Drive kit 3 hp 535 725 kit 1 685 1045 rom kit 2 685 1045 rom 5 hp 4kit 2 685 865 rpm 3 850 865 rpm kit 4 945
44. UNITS 52 05 NEE HEATING SECTION A2 Wi p ow EE RE ROLLOUT BURNER SEW U S A Page 84 SEQUENCE OF OPERATION GAS HEAT FOR LGC156 300 470 UNITS FIRST STAGE HEAT 1 2 Heating demand initiates at W1 in thermostat 24VAC is routed through TB35 to the main con trol module A55 After A55 proves N C primary limit S10 and N C secondary limit S21 the com bustion air blower relay K13 is energized N O K13 1 contacts close allowing line voltage or transformer T3 in 460V and 575V only to ener gize combustion air blower B6 After the combustion air blower B6 has reached full speed the combustion air proving switch S18 con tacts close The 55 routes 24VAC through N C burner 1 flame rollout switch S47 and the closed con tacts of the combustion air proving switch S18 to energize the ignition module A3 After a 30 second delay A3 energizes the gas valve GV1 on low fire As steps 2 3 and 4 occur 24VAC is also routed to the gas valve control module 58 After A58 proves primary gas heat limit S99 and N C secondary limit 100 the combustion air blower relay K19 is ener gized 19 1 contacts close allowing line voltage or transformer T13 in 460V and 575V only to energize combustion air blower B15 After the combustion air blower B15 has reached full speed the combustion air proving switch S45 con tacts close The A58 routes 24VAC through N C burner 2 flame rollou
45. Watt 3 Integrated Part Load Value Btuh Watt Refrigerant Charge Circuit 1 Furnished R 22 Circuit 2 R410A Circuit 3 Circuit 4 Circuit 1 Circuit 2 Circuit 3 Circuit 4 Heat Input Type Cooling Performance Refrigerant Charge Furnished R 22 R410A with Humiditrol Option Gas Heating Performance Input Btuh kW First Stage Second Stage Output Btuh KW Second Stage CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural LPG Propane Compressor Type no Condenser Coils Net face area sq ft m total Tube diameter in mm Number of rows Fins per inch m Motor horsepower W Motor rpm Total Motor watts Diameter in mm No of blades Total Air volume cfm L s Net face area sq ft m total Tube diameter in mm No of rows Fins per inch m Drain connection number and size Expansion device type Nominal motor output Condenser Fans Evaporator Coils Indoor Blower and Drive Selection Maximum usable motor output US Only Motor Drive kit Blower wheel nominal diameter x width Type of filter No and size in mm Filters external duct static pressure 3 20 Ton LGC240S2B Standard 243 000 71 2 1 232 000 67 9 24 4 8000 3775 19 5 9 8 11 165 0 oz 4 99 kg 11 Ibs 0 oz 4 99 11 Ibs 0 oz 4 99 kg 11 Ibs 0 oz 4 99 kg Not Available Not Available Not Available Not Ava
46. automatic spark ignition system Do not attempt to light manually In case of a safety shutdown move thermostat switch to OFF and return the thermostat switch to HEAT to reset igni tion control 1 Placing Furnace In Operation Gas Valve Operation for White Rodgers 36C and Honeywell VR8205Q VR8305Q figure 27 1 Set thermostat to lowest setting 2 Turn off all electrical power to appliance 3 This appliance is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand 4 Open or remove the heat section access panel 5 Turn the knob on the gas valve clockwise P to OFF Depress 36C knob slightly Do not force 6 Wait five 5 minutes to clear out any gas If you then smell gas STOP Immediately call your gas suppli er from a neighbor s phone Follow the gas supplier s instructions If you do not smell gas go to the next step 7 Turn the knob on the gas valve counterclockwise to Do not force WHITE RODGERS 36C76 GAS VALVE STAGE 2 MANUAL MANIFOLD PRESSURE ADJUSTMENT SCREW UNDER CAP OUTLET PRESSURE TAP SIDE INLET PRESSURE TAP SIDE GAS VALVE SHOWN IN OFF HONEYWELL VR8305 VR8205 GAS VALVE GAS VALVE SHOWN IN OFF POSITION HIGH FIRE LOW FIRE ADJUSTMENT ADJUSTMENT OUTLET 4 PRESSURE TAP PRESSURE TAP FIGURE 27 8 Close or replace the heat section access panel
47. bend electrodes 5 Disconnect power to unit before disconnecting meter Make sure sensor wire is securely reconnected before reconnecting power to unit Page 61 TABLE 30 Nominal Signal Drop Out NOTE If the meter scale reads 0 the leads are re versed Disconnect power and reconnect leads for proper polarity 10 Combustion Air Inducer The combustion air inducer is factory set and is not field ad justable However operation should be monitored to ensure proper operation The combustion air inducer is used to draw fresh air into the combustion chamber while simultaneously expelling exhaust gases The inducer operates throughout the heating cycle On a heating demand the ignition control is energized by the main control module 55 The ignition control then allows 30 to 40 seconds for the combustion air inducer to vent exhaust gases from the burners When the combustion air induc er is purging the exhaust gases the combustion air prove switch is closing proving that the combustion air inducer is op erating before allowing the ignition control to energize When the combustion air prove switch is closed and the delay is over the ignition control activates the first stage operator of the gas valve low fire the spark and the flame sensing elec trode Sparking stops immediately after flame is sensed 11 High Altitude Units may be installed at altitudes up to 2000 feet 610 m above sea level without any modificatio
48. box components TB13 termi nal strip distributes line voltage power to the line voltage items in the unit TB34 terminal strip distributes 24V power from T1 to the control box components LGC156 300 units only TB35 terminal strip distributes 24V power from T18 to the contactors in the control box 6 Outdoor Fan Motor Fuse Block amp Fuses F10 LGC156 300 Three line voltage fuses F10 provide overcurrent protec tion to all condenser fans and optional power exhaust fans in all units The fuses are rated at 30A in 208 230V units and 15A in all others 7 Outdoor Fan Capacitors C1 amp C2 all units C18 amp C19 LGC156 300 Fan capacitors C1 C2 C18 C19 370V 10 MFD capaci tors used to assist in the start up of condenser fans B4 B5 B21 B22 respectively 8 Compressor Contactor K1 amp K2 all units K14 LGC156 300 amp K146 LGC210 300 units All compressor contactors are three pole double break contactors with 24VAC coils In all LGC units K1 ener gized by 55 and K2 energized by A57 energize com pressors B1 and B2 in response to thermostat demand In the LGC156 300 K1 energized by A55 K2 energized by A57 and K14 energized by A59 energize compressors B1 B2 and B13 in response to first or second stage cool demand In the LGC210 300 K1 energized by A55 K2 energized by A57 K14 and K146 energized by A59 en ergize compressors B1 B2 B13 and B20 in response to first or second stage co
49. manufactured by various manufacturers therefore electrical FLA and LRA specifications will vary See unit rating plate for information specific to your unit OPERATION ADJUSTMENT Blower Operation NOTE The following is a generalized procedure and does not apply to all thermostat control systems 1 Blower operation is dependent on the thermostat control system option that has been installed in the units Refer to operation sequence of the control system installed for de tailed descriptions of blower operation 2 Generally blower operation is set at the thermostat fan switch With the fan switch in ON position and the OCP input is ON the blower operates continuously With the fan switch in AUTO position the blower cycles with demand 3 In most cases the blower and entire unit will be off when the system switch is in the OFF position The only ex ception is immediately after a heating demand when the blower control keeps the blower on until all heat is ex tracted from the heat exchanger Determining Unit Air Volume 1 The following measurements must be made with a dry in door coil Run blower without cooling demand Air filters must be in place when measurements are taken 2 With all access panels in place measure static pres sure external to unit from supply to return 3 Measure the indoor blower wheel RPM 4 Refer to blower tables in BLOWER DATA table of con tents in the front of
50. operate in one of four modes Each mode requires a different EM1 economizer DIP switch set ting Each mode also requires different sensors 1 TMP MODE SENSIBLE TEMPERATURE In the TMP mode the IMC uses input from the factory installed RT6 Supply Air Sensor RT16 Retum Air Sensor and RT17 Outdoor Air Sensor to determine suitability of outside air and economizer damper operation When outdoor sensible temperature is less than return air sensible temperature out door air is used for cooling This may be supplemented by me chanical cooling to meet comfort demands This application does not require additional optional sensors 2 ODE MODE OUTDOOR ENTHALPY The or outdoor enthalpy mode requires a field pro vided and installed Honeywell C7400 enthalpy sensor 16K96 The sensor monitors outdoor air temperature and humidity enthalpy When outdoor air enthalpy is be low the enthalpy control setpoint the economizer modu lates to allow outdoor air for free cooling 3 DIF MODE DIFFERENTIAL ENTHALPY The DIF or differential enthalpy mode requires two field pro vided and installed Honeywell C7400 enthalpy sensors 16K97 One sensor is installed in the outside air opening and the other sensor is installed in the return air opening When the outdoor air enthalpy is below the return air en thalpy the economizer opens to bring in outdoor air for free cooling 4 GLO MODE GLOBAL Global Mode
51. remaking power to the ignition control See figure 18 for normal ignition sequence and figure 19 for the ignition attempt sequence with re trials nominal timings given for simplicity Specific timings for the ignition controls are shown in figure 20 TABLE 1 Manufacturer LED Code Description Normal Reset Mode 5secon 2 5 sec off No Power or Dejected Fail Flame rectification sensing is used on all LGC units Loss of flame during a heating cycle is indicated by an ab sence of flame signal 0 microamps If this happens the con trol will immediately restart the ignition sequence and then lock out if ignition is not gained after the third trial See System Service Checks section for flame current measure ment The control shuts off gas flow immediately in the event of a power failure Upon restoration of gas and power the control will restart the ignition sequence and continue until flame is established or system locks out On a heating demand the ignition control is energized by the main control module A55 The ignition control then allows 30 to 40 seconds for the combustion air blower to vent exhaust gases from the burners When the combustion air blower is purging the exhaust gases the combustion air prove switch is closing proving that the combustion air blower is operating before allowing the ignition control to energize When the combustion air prove switch is closed and the delay is over the ignition control
52. stage In all cases the capacity of each compressor is add ed to reach the total capacity of the unit See SPECIFI CATIONS and ELECTRICAL DATA table of contents or compressor nameplate for compressor specifications A WARNING Electrical shock hazard Compressor must be grounded Do not operate without protective cover over terminals Disconnect power before removing protective cover Discharge capacitors before ser vicing unit Failure to follow these precautions could cause electrical shock resulting in injury or death Each compressor is energized by a corresponding com pressor contactor NOTE Refer to the wiring diagram section for specific unit operation 2 Crankcase Heaters HR1 and HR2 all units HR5 LGC156 300 HR11 LGC210 300 AII LGC units use insertion type heaters Heater HR1 is installed around compressor B1 heater HR2 compressor B2 HR5 compressor B13 and HR11 compressor B20 Crankcase heater wattage varies by compressor manufac turer NOTE Pressure switch settings 84 57 511 584 887 and 588 will be significantly higher on R410A charged units than R22 charged units 3 High Pressure Switches 84 and 87 all units 28 LGC156 300 96 LGC210 300 The high pressure switches is an auto reset SPST N C switch which opens on a pressure rise All units are equipped with this switch The switch is located in the compressor discharge line and is wired in series with the compressor con
53. the system is not properly charged or that a problem exists with some component in the system Correct any system problems before proceeding 6 If discharge pressure is high remove refrigerant from the system discharge pressure 15 low add refriger ant to the system e Add or remove charge in increments e Allow the system to stabilize each time refriger ant is added or removed 7 Use the following approach method along with the nor mal operating pressures to confirm readings LGC Units Charged With R 22 TABLE 4 LGC090 CIRCUIT 1 CIRCUIT 2 Outdoor Coil Dis Dis Entering Charge Suction charge i 10 E 5 es 10 6 Suction 5 psig TABLE 5 LGC102S Outdoor Coil Entering Air Temp 65 F TABLE 6 LGC120 CIRCUIT 1 CIRCUIT 2 Coil Entering Dis 10 Suct 5 Dis 10 Suc 5 Air Temp 9 psig psig psig 180 TABLE 7 LGC150S Outdoor CIRCUIT 1 CIRCUIT 2 Coil Entering Dis 10 Suct 5 Dis 10 Suc 5 Air GT psig psig psig psig ET KLM F 85 r mm o EC sc E 115 330 75 332 76 Page 54 TABLE 8 TABLE 12 LGC150S with Humiditrol LGC180H Outdoor CIRCUIT 1 Coil Entering Dis 10 Suct 5 Dis 10 Suc 5 Air Temp PSig psig psig psig 185 69 Outdoor Coil Entering Air Temp 66 209 71 68 236 72 71 265 73 73 297 75 75 332 76 TABLE 9 LGC156H Outdoor __CI
54. will be equipped with a relay manufactured by Telemecanique figure 6 or Siemens figure 7 Page 37 LINE VOLTAGE IN TELEMECANIQUE OVERLOAD RELAY TRIP INDICATON WINDOW CLEAR COVER DETAIL SHOWING RESET BUTTON SHOWN ADJUSTED TO MANUAL POSITION CLOSED AMP SETTING POINTER Ng STOP Lift clear cover and turn adjustment screw BUTTON Es counterclockwise Reset screw will pop out RED when pointer is in M manual position Close cover to lock reset screw into position Q AMP SETTING TEST 1 CONTROL BLUE DIAL 6 Ole e RED TEST BUTTON S 2 P Push To Test BLUE RESET SCREW Shown in AUTO position as LOAD VOLTAGE OUT shipped from the factory Lift clear cover to adjust relay amp setting according to value given on the blower motor nameplate Proper relay amp setting equals motor nameplate FLA X service factor of 1 15 X 95 Cover must also be lifted to adjust control mode from automatic reset to manual reset see detail above and to test the control Control must be in the manual reset mode to perform a test Use a pointed object to press the small red test button A yellow marker should appear in the trip indication window to the right of the amp setting control Press the blue reset screw to reset the relay The red STOP button opens the normally closed contacts
55. 0 2 20 1100 2 45 1145 2 65 1195 2 95 1240 3 25 1300 0 34 0 48 0 63 0 78 0 93 1 08 1 27 1 42 1 64 1 83 1 98 2 20 2 42 3000 525 0 55 615 0 75 695 0 95 770 1 20 835 1 40 895 1 60 955 1 85 1010 2 10 1060 2 35 1110 2 65 1160 2 90 1205 3 20 1250 3 45 1415 0 41 0 56 0 71 0 90 1 04 1 19 1 38 1 57 1 75 1 98 2 16 2 39 2 57 3250 550 0 65 640 0 90 715 1 101790 1 35 855 1 60 915 1 80 970 2 05 1025 2 35 1075 2 60 1125 2 85 1170 3 15 1215 3 40 1260 3 70 3500 580 0 80 665 1 051740 1 25 810 1 50 870 1 75 930 2 00 985 2 25 1040 2 55 1090 2 85 1135 3 10 1185 3 40 1230 3 70 1270 4 00 3750 605 0 95 690 1 20 760 1 45 830 1 70 890 1 95 950 2 25 1005 2 50 1055 2 80 1105 3 10 1150 3 35 1195 3 65 1240 3 95 1285 4 30 4000 635 1 10 715 1 40 785 1 65 850 1 90 910 220 965 2 45 1020 2 75 1070 3 05 1120 3 35 1165 3 65 1210 3 95 1255 4 30 1295 4 60 4250 665 1 30 740 1 60 810 1 85 870 2 15 930 2 45 985 2 75 1040 3 05 1090 3 35 1135 3 65 1185 4 00 1225 4 30 1270 4 65 1310 4 95 4500 695 1 50 770 1 80 835 2 10 895 2 40 955 2 70 1005 3 00 1060 3 35 1105 3 65 1155 4 00 1200 4 30 1245 4 65 1285 5 00 1325 5 30 4750 725 1 75 795 2 05 860 2 40 920 2 70 975 3 00 1030 3 35 1080 3 65 1125 3 95 1175 4 35 1215 4 65 1260 5 00 1300 5 35 1340 5 70 5000 760 2 05 825 2 35 885 2 65 945 3 00 1000 3 35 1050 3 65 1100 4 00 1145 4 35 1190 4 70 1235 5 05 1280 5 45 5250 790 2 30 855 2 65 910 2 95 970
56. 00 relative humidity 4 Jumper the following TB1 terminals 8 amp 9 occupied mode 6 amp 3 blower demand G 24 amp 6 digital input applications only The blower compressor 1 and compressor 2 reheat should be operating L14 and L30 LED s on the A67 board should also be ON indicating the reheat valves are energized TABLE 32 Relative Humidity RH 3 20 30 40 50 60 70 80 90 9 00 5 Press the IMC pushbutton to by pass the compressor minimum run delay 6 For RH sensors disconnect the jumper between TB1 terminals 8 amp 9 occupied mode For digital input re move the jumper between TB1 6 amp 24 Page 69 Compressor 1 and 2 reheat should de energize L14 and L30 LED s should go OFF blower should still be energized 8 When check out is complete remove all jumpers set ECTO 4 25 back to the proper humidity set point and set ECTO 6 01 to the proper setting Default Reheat Operation Humiditrol unit reheat control parameter 4 24 is factory set to option 6 Reheat will operate as shown in table 35 once three conditions are met 1 Blower must be operating 2 System must be in occupied mode 3 System must NOT be operating in heating mode IMPORTANT Free cooling does not operate during re heat Free cooling will operate as shown in the IMC manu al Reheat Control Options Reheat control parameter 4 24 can be set to other reheat control operating conditions as fol
57. 00S 150S and first heat section on LGC156 300 and S69 on second heat section on LGC156 300 are SPST N C high temperature lim its located just above the bumer air intake opening in the er enclosures see figures 15 and 16 S47 is wired to the main control pane A55 while S69 is wired to the gas 2 panel A58 When S47 or S69 senses flame rollout indicating a blockage in the combustion air passages the corre sponding flame rollout limit trips and the ignition control immediately closes the gas valve Limit S47 and S69 in standard heat units are factory preset to open at 250 F 12 F 121 1 C 6 7 C on a tempera ture rise while on high heat units both limits open at 270 F 12 F 132 2 C 6 7 C a temperature rise All flame rol lout limits are manual reset 7 Combustion Air Prove Switches 18 all units amp S45 LGC156 300 Prove switch S18 is located in the vestibule area on LGC090 150 units On LGC156 300 units 518 first heat sec tion and S45 second heat section switches are located in the compressor compartment Both are SPST N O switches are identical and monitor combustion air inducer operation Switch 18 is wired to the main control panel A55 while S45 is wired to the gas 2 panel 58 The switch closes on a negative pressure fall This nega tive pressure fall and switch actuation allows the ignition sequence to continue proves by closing that the combus tion air inducer is operating befo
58. 1 BISER ko ao e nit FR FR FR CO CO CC CC OR 28 bed 17834 TB35 1 460V 575V UNITS LGA Ge DESCRIPTION KEY COMPONENT 4118 41145 K65 1 2 RELAY EXHAUST FAN PIAA pr JAN K68 1 2 RELAY OUTDOOR FAN 2 A55 K146 1 ICONTACTOR COMPRESSOR 4 K149 1 2JRELAY OUTDOOR FAN 5 59 LG K150 1 2 RELAY OUTDOOR FAN 4 A55 PIB PLUG PED gt P24 PLUG EXHAUST FAN 43 Q P35 IPLUG TEST HEAT PLUG TEST COOL 44 PLUG OUTDOOR FAN I PLUG OUTDOOR FAN 2 PLUG BLOWER DECK lt lt 91118 PLUG MOTOR OUTDOOR FAN 3 PLUG MOTOR OUTDOOR FAN 4 PLUG GAS OUTPUT PLUG COOLING SENSOR INPUT PLUG BLOWER 4 COOL CONT PLUG SENSOR INPUT PLUG ECONOMIZER OUTPUT PLUG COMPRESSOR 2 PLUG COMP 5 4 4 CONTROL PLUG COMP 3 4 4 INPUT PLUG BIO EXHAUST FAN MOTOR PLUG BII EXHAUST FAN MOTOR PLUG EXHAUST FAN 2 SWITCH LIMIT HI PRESS COMP SWITCH LIMIT HI PRESS COMP 2 SWITCH LOW PRESS LOW AMB KIT SWITCH LIMIT HI PRESS COMP 5 OVERLOAD RELAY BLOWER MOTOR SWITCH DISCONNECT 649 SWITCH FREEZESTAT 1 550 SWITCH FREEZESTAT COMP 2 553 SWITCH FREEZESTAT COMP 5 584 SWITCH LOW PRESS LOW
59. 1 and S84 wired in parallel are wired in series with outdoor fan relay K10 Compressor one Compres sor two is under control of the IMC board In the LGC156 180 units S11 compressor one S84 compressor two and S85 compressor three are wired in parallel to the low ambient switch relay K159 In the LGC 210 240 300 units S11 and S84 are in parallel wired to outdoor fan relay K10 while S85 and S94 compressor four are in parallel wired to third outdoor fan relay K149 Page 44 Units charged with R22 When liquid pressure rises to 275 10 psig 1896 69 kPa the switch closes and the condenser fan is ener gized When discharge pressure in one refrigerant circuit drops to 150 10 psig 1034 69 kPa the switch opens and the condenser fan in that refrigerant circuit is de ener gized This intermittent fan operation results in higher evaporating temperature allowing the system to operate without icing the evaporator coil and losing capacity Units charged with R410A When liquid pressure rises to 450 10 psig 3102 69 kPa the switch closes and the condenser fan is ener gized When discharge pressure in one refrigerant circuit drops to 240 10 psig 1655 69 kPa the switch opens and the condenser fan in that refrigerant circuit is de ener gized This intermittent fan operation results in higher evaporating temperature allowing the system to operate without icing the evaporator coil and losing capacity 5 Low Pressure
60. 117 000 34 3 156 000 45 7 84 500 24 8 117 000 34 3 156 000 45 7 Second Stage 130 000 38 1 180 000 52 7 240 000 70 3 130 000 38 1 180 000 52 7 240 000 70 3 Output Btuh kW Second Stage 104 000 30 5 144 000 42 2 192 000 56 3 104 000 30 5 144 000 42 2 192 000 56 3 CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural LPG Propane Compressor Type No 80 0 3 4 in npt 7 in w c 1 7 kPa 11 in w c 2 7 kPa 80 0 3 4 in npt 7 in w c 1 7 kPa 11 in w c 2 7 kPa Condenser Net face area sq ft m4 29 3 2 72 total 29 3 2 72 total Coil Tube diameter in mm 3 8 9 5 3 8 9 5 Number of rows 1 1 Fins per inch m 20 787 20 787 Condenser Motor horsepower W 2 1 3 249 2 1 3 249 Fans Motor rpm 1075 1075 Total Motor watts 700 700 Diameter in mm no of blades 2 24 610 3 2 24 610 3 Total air volume cfm L s 8 000 3775 8 000 3775 Evaporator Net face area sq ft m 10 5 0 98 total 10 5 0 98 total Coil Tube diameter in mm No of rows 3 8 9 5 3 3 8 9 5 3 Fins per inch m 14 551 14 551 Drain connection no amp size 1 1 in NPT coupling 1 1 in NPT coupling Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head Indoor Nominal motor output 2 hp 1 5 kW 3 hp 2 2 kW 5 hp 3 7 kW Blower and Maximum usable motor output 2 3
61. 15 8000 0 08 0 13 0 09 0 13 0 03 9250 0 11 0 17 0 15 0 18 0 03 Air Volume cfm Page 29 BLOWER DATA CEILING DIFFUSER AIR RESISTANCE Step Down Diffuser Flush Diffuser Air Volume RTD11 185 RTD11 275 cm Us ws wg wg wg wg Pl wg wg 5000 2360 51 127 44 109 Suh dul 5200 2455 fos 5400 2550 61 152 52 129 xa 5800 2735 71 177 59 147 2423 E 6000 2830 76 189 63 157 29 72 6200 2925 80 199 68 169 ae 6400 3020 72 179 6500 3065 34 85 6600 3115 92 229 77 19 Site 6800 3210 99 246 83 206 Lii mec 7000 3305 A0 99 7200 3400 1 09 271 92 229 Lum nns 7400 3490 Lp hie 7500 3540 45 112 7600 3585 120 301 1 02 254 nada 8000 3775 50 124 8500 4010 2222 57 142 9000 4245 66 164 9500 4485 22 he 74 184 10 000 4720 81 201 10 500 4955 222 eae 89 221 11 000 5190 121 301 101 251 88 219 pe 96 239 Page 30 BLOWER DATA POWER EXHAUST FANS STANDARD STATIC OPERATION Negative He Pressure Air Volume in w g Pa cfm Lis 0 0 8630 4070 0 05 12 8210 3875 0 10 25 7725 3645 0 15 37 7110 3355 0 20 50 6470 3055 0 25 62 5790 2730 0 30 75 5060 2390 0 35 87 4300 2030 0 40 100 3510 1655 0 45 112 2690 1270 0 50 125 1840 870 CEILING DIFFUSER AIR THROW DATA 1 Effective Throw Range Ar Volume Step Down Flush
62. 3 35 1020 3 65 1070 4 00 1120 4 35 1165 4 70 1210 5 10 1255 5 45 5500 820 2 60 880 2 95 940 3 30 995 3 70 1045 4 05 1095 4 40 1145 4 80 1190 5 15 1230 5 50 5750 850 2 95 910 3 30 965 3 70 1020 4 05 1070 4 45 1120 4 80 1165 5 20 1210 5 60 6000 885 3 35 940 3 70 995 4 10 1045 4 45 1095 4 85 1145 5 25 1190 5 65 FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Motor Outputs RPM Range Nominal Maximum i Motor Efficiency Drive 1 Drive 2 Drive 3 Drive 4 Drive 5 Drive 6 Standard or High 680 925 895 1120 Sand s 22545 z5 sos ms rs High 3 22326 85 92 moss Standard or High 75 a7 695 120 mos NOTE Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 21 BLOWER DATA FACTORY INSTALLED OPTIONS FIELD INSTALLED ACCESSORY AIR RESISTANCE Wet Indoor Coil Humiditrol Gas Heat Exchanger Filters Condenser Economizer 090 102 120 150 Reheat Coil Air Volume MERV 11 MERV 15 in w g Pa cfm 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750
63. 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 4 8 1 9 3 8 Service Outlet 15V GFI Se Indoor Blower Horsepower 5 7 5 7 5 Motor Rated Load Amps T 9 1 9 Locked Rotor Amps 23 4 36 6 54 Maximum Unit only 40 Seis meer Minimum Unit JEMEN 32 Ampacity with power exhaust ESSEN 34 Disconnect 84M13 NOTE Extremes of operating range are plus and minus 10 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 17 ELECTRICAL DATA LGC210 ELECTRICAL DATA 17 5 TON 17 5 TON STANDARD EFFICIENCY R 22 LGC21082 Voltage 60hz 3 phase 575V Compressors Rated Load Amps total 14 7 58 8 7 1 28 4 5 8 23 2 4 Locked Rotor Amps total 91 364 50 200 37 148 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 5 2 1 4 Motors 4 Locked Rotor Amps total 4 7 18 8 24 96 1 9 7 6 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 2 4 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 2 4 4 8 1 9 3 8 Service Outlet 115V GFI 15 15 eee 15 Amps Indoor Blower Horsepower Ag 5 Fur 5 7 5 Motor Rated Load Amps Pb 6 S 5 8 5 6 9 61 9 Locked Rotor 66 SA 8 5 4 6 4 36 6 54 Unit only 90 40 45 with power exhaust 45 Minimum Circuit Unit onl
64. 55 FAN RELAY K68 ol 1 I rl SECOND SECTION HEAT RELAY K19 o BLOWER CONTACTOR COMPRESSOR OUTDOOR OUTDOOR FAN TERMINAL RELAY 3 CONTACTOR CAPACITOR 1 CAPACITOR 3 1 K1 K14 C1 C18 BLOWER MOTOR COMPRESSOR COMPRESSOR 4 OVERLOAD RELAY 542 2 CONTACTOR CONTACTOR OUTDOOR FAN OUTDOOR FAN DIFFERENT BLOWER MOTORS K2 K146 210 240 15 CAPACITOR2 CAPACITOR 4 6H UNITS ONLY C2 C19 9126 P66 125 126 J66 5125 000 TERMINAL 1815 BLOCK 13 DISCONNECT SWITCH 48 OPTIONAL 12 BURNER 2 BURNER 1 GROUND CONTROL CONTROL A12 A3 FIGURE 4 I UNIT COMPONENT
65. 56 180 210 240 3005 No INDOOR AIR QUALITY Air Filters Healthy Climate High Efficiency Air Filters MERV 11 C1FLTR20C 1 97187 9 per nl MERV 15 C1FLTR50C 1 284405 x Replaceable Media Filter With Metal Mesh Frame C1FLTR30C 44 61 x includes non pleated filter media 24 x 24 x 2 order 6 per unit Germicidal Lamps Healthy Climate UVC Germicidal Lamps 208 230V C1UVCL10C 7521 x 460V C1UVCL10C 7526 x 575V C1UVCL10C 7531 x D Indoor Air Quality Sensors Sensor white case w display COSNSRS50AE1L 77N39 x x x Sensor white case no display COSNSR52AE1L 87 53 x Sensor black case w display COSNSR51AE1L 87352 x Sensor black case no display COSNSR53AE1L 87 54 x CO Sensor Duct Mounting Kit COMISC19AE1 85L43 x Aspiration Box for duct mounting Sensor COMISC16AE1 90N43 x Handheld Monitor LTAIAQSHMO3 36 70N93 x x ELECTRICAL Voltage 208 230V 3 phase Factory O SE 460 Factory o 575V 3 phase Factory O O O HACR Circuit Breakers Factory O Disconnect Switch See Electrical Electric Heat 80 84 13 9 e Tables for selection 150 84 14 0 0 250 84 15 9 0 Service Outlets LTAGFIK1015 74 70 9 9 0 Phase Monitor Factory O ECONOMIZER Economiz
66. 6 4 After the combustion air blower B6 has reached full speed the combustion air proving switch S18 contacts close The 55 routes 24VAC through N C burner flame rollout switch S47 and the closed contacts of combustion air proving switch 518 to energize the igni tion module A3 5 After a 30 second delay A3 energizes the ignitor and LO terminal low fire of gas valve GV1 Second Stage Heat 6 With first stage heat operating an additional heating demand initiates W2 in the thermostat 7 second stage heating demand is received by 55 control module 8 55 energizes HI terminal high fire of gas valve GV1 End of Second Stage Heat 9 Heating demand is satisfied Terminal W2 high fire is de energized 10 Terminal HI of GV1 is de energized by A55 control module End of First Stage Heat 11 Heating demand is satisfied Terminal W1 low fire is de energized 12 Ignition is de energized by control module 55 in turn de energizing terminal LO of GV1 Combustion air blower relay K13 is also de energized Optional Low Ambient Kit 50 C Low Ambient Kit 13 Line voltage or transformer T20 in 460V and 575V only is routed through the low ambient kit fuses F20 and N C low ambient kit thermostats S60 and S61 to energize low ambient kit heater HR6 Page 80 Lg bed K LCA LGA SY 9114 A pu LU DESCRIPTION PIIN COMPONENT 55 KI CONTACTOR COMPR
67. 65 4 kit 2 865 kit 2 685 P 865 rem kit 3 850 1045 kit 4 945 1185 rpm Blower wheel nom dia x width in mm 2 15 x 15 381 x 381 Filters Type of filter Disposable Electrical characteristics 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum external duct static pressure 2 Integrated Part Load Value tested at 80 F 27 C outdoor air temperature 3 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Kit 2 is used with high efficiency HP motor only Page 4 SPECIFICATIONS LGC180H General Nominal Tonnage Data Model No Efficiency Type Cooling Gross Cooling Capacity Btuh kW Performance 1 Net Cooling Capacity Btuh kW ARI Rated Air Flow cfm L s Total Unit Power kW 1 EER Btuh Watt 2 I
68. 69 000 49 5 se 260 000 76 2 234 000 68 6 360 000 105 5 312 000 91 4 480 000 140 6 135 000 39 6 SEN See ae 208 000 60 9 288 000 84 4 384 000 112 5 80 0 1 in 7 in w g 1 7 kPa 11 in w g 2 7 kPa Scroll 3 56 5 5 25 3 8 9 5 20 787 4 1 3 249 1075 1395 4 24 610 15 450 7290 Evaporator Net face area sq ft m7 total Coils Tube diameter in mm No of rows Fins per inch m Condensate Drain number and size Expansion device type 22 3 2 07 3 8 9 5 14 551 1 1 in NPT coupling Balanced Port Thermostatic Expansion Valve removeable power head Indoor Nominal motor output Blower and Drive Selection Maximum usable r output Only Motor Drive kit number Blower wheel nom dia x width in mm Filters Type of filter No and size in mm Electrical characteristics 3 hp 2 2 kW 5 hp 3 7 kW 7 5 hp 5 6 kW 3 45 hp 2 6 KW 5 75 hp 4 3 kW 8 63 hp 6 4 kW 3 hp kit HA 535 725 rpm kit 1 685 865 rpm kit 2 954 865 4 kit 2 r 865 rpm kit 3 850 1045 rpm kit 4 945 1185 rpm 7 5 hp 5 945 1185 rpm 6 1045 1285 rpm kit 850 1045 rpm 2 15 x 15 381 x 381 Disposable 6 24 x 24 x 2 6010 x 610 x 51 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower
69. 9 Exhaust Fans 2 Full Load Amps total 24 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 48 1 9 3 8 Service Outlet 15V GFI 75 Amps Indoor Blower Horsepower 5 10 Rated Load Amps SCH 1 11 Locked Rotor Amps 193 2 6 66 Maximum Unit only 110 125 125 50 60 50 with power exhaust 110 125 125 50 Minimum Unit only 102 109 40 Ampacity with power exhaust 100 107 42 Disconnect 84 13 NOTE Extremes of operating range are plus and minus 10 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 19 ELECTRICAL DATA LGC300 ELECTRICAL DATA 25 TON 25 TON STANDARD EFFICIENCY R 22 LGC300S2 Voltage 60hz 3 phase 575V Compressors Rated Load Amps total 18 6 74 4 9 36 7 4 29 6 4 Locked Rotor Amps total 156 624 75 300 5A 216 Outdoor Fan Full Load Amps total 3 12 1 5 6 1 2 4 8 Motors 4 Locked Rotor Amps total 6 24 3 12 2 9 11 6 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 2 4 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 4 8 1 9 3 8 Service Outlet 115V GFI 15 15Amps 15 15Ams 15 Amps Indoor Blower Horsepower anes 5 10 ere a 7 2 10 Motor Rated Load Amps i 7 d S 5 6 5 1 11 Locked Rotor Amps 105 2 6 KS 6 66 Maximum Unit onl
70. 9 e 9 Manual LAOAD18 24 16K9 9 9 Outdoor Air Hood down flow Number of Filters C1HOOD10C 3 85 25 9 9 0 16 x 25 x 1 in Power Exhaust Standard Static 208 230V CIPWRE20C 1Y 85 37 9 9 9 0 460V C1PWRE20C 1G 85 38 9 9 9 9 575V C1IPWRE20C 1J 85 39 9 9 9 ROOF CURBS 1000 Down Flow 8 in height C1CURB40CD1 26W32 D 14 in height LARMF18 30S 14 33K44 x x x 18 in height LARMF18 30S 18 33K45 x 24 in height LARMF18 30S 24 33K46 x x Horizontal Canada Only 26 in height LARMFH18 245 26 33 47 x 37 in height LARMFH18 248 37 45 70 x ROOF CURBS STANDARD Down Flow 14 in height LARMF18 36 14 16K87 x 24 in height LARMF18 36 24 16 88 x x x Horizontal 26 in height Rooftop Applications LARMFH18 24 26 97433 x 37 in height Slab Applications LARMFH18 24 37 38 53 x 30 height Rooftop applications LARMFH30 36 30 33 79 41 in height Slab applications LARMFH30 36 41 38K54 Horizontal Air Panel Kit C1HAP10C 1 87 00 x Insulation Kits for LARMFH18 24 26 C1INSU11C 1 73K32 x for LARMFH18 24 37 C1INSU13C 1 73K34 x for LARMFH30 36 30 73K33 for LARMFH30 36 41 73K35 CEILING DIFFUSERS Step Down Order one 11 185 29606 x Canada Only RTD11 150 1808 13 63 x RTD11 275 R 29607 Canada Only
71. AL STRIP TRANS 118 A Oy S42 UDED ON M VOLTAGE UNITS DESCRIPTION DESCRIPTION COMPONENT COMPONENT OHO 8 AND UNITS WITH HIGH EFFICIENCY MOTORS A F6 AND FIO FUSES ARE USED ON m Y VOLTAGE UNITS ONLY gt 149 gt cis 9106 KI50 1 19 2o gt gt P47 295 P52 mm e IK gt DS PANEL CAPACITOR OUTDOOR FAN 4 DESCRIPTION PANEL ECONOMI ZER CIRCUIT BREAKER TRANS TI COMPONENT 4133 PANEL COMPRESSOR 2 CIRCUIT BREAKER TRANS 118 PANEL COMPRESSOR 3 4 4 F6 FUSE EXHAUST FAN He JACK MOTOR OUTDOOR FAN 4 BI0 ess 2 COMPRESSOR USE OUTDOOR FAN MOTOR COMPRESSOR 2 USE TRANS 129 PRIMARY MOTOR BLOWER USE TRANS 129 SECONDARY JACK GAS QUIPUT JACK COOLING SENSOR INPUT JACK BLOWER 4 COOL CONT JACK SENSOR INPUT MOTOR OUTDOOR FAN EATER COMPRESSOR 1 Err JACK ECONOMIZER OUTPUT WIRING DIAGRAM 2703 MOTOR OUTDOOR FAN EATER COMPRESSOR 2 JACK COMPRESSOR 2 MOTOR EXHAUST FAN IHEATER COMPRESSOR 5 JACK COME 3 amp 4 CONTROL COMBINATION PACKAGED ROOF TOP MOTOR EXHAUST FAN IHEATER COMPRESSOR 4 JACK COMP 3 4 4 INPUT COMPRESSOR 3 JACK GFI RECEPTACLE JACK BLWR EXHAUST FAN COMPRE
72. ATION Furnished COUNTER FLASHING NAILER STRIP Field Supplied Furnished CANT STRIP Field Supplied RIGID INSULATION Field Supplied ROOF MOUNTING FRAME Extends around entire perimeter of unit ROOFING MATERIAL FIGURE 32 B Transitions LGC090 150 Optional supply return transitions LASRT08 10 is avail able for use with the LGC 7 5 ton units and LASRT10 12 is available for the 8 5 and 10 ton units utilizing optional LARMF 10 15 roof mounting frames LGC 12 5 ton units will use LASRT15 with LARMF10 15 roof mounting frame Transition must be installed in the LARMF mounting frame before mounting the unit to the frame Refer to the manufacturer s instructions included with the transition for detailed installation procedures LGC156 300 Optional supply return transitions LASRT18 24 are available for use with LGC series units utilizing optional LARMF 18 36 roof mounting frame Transition must be installed in the LARMF18 36 mounting frame before mounting the unit to the frame Refer to the manufacturer s instructions included with the transition for detailed installa tion procedures C LAOAD M Outdoor Air Dampers all units LAOAD M 10 15 used 16 0905 1505 LAOAD M 18 24 figure 33 used on LGC156H 3008 units consists of a set of dampers which may be manually or mo tor M operated to allow up to 25 percent outside air into the system at all times see figure 33 Either air damper can be i
73. E PLUG DISCHARGE TEMP SENSO RETURN TEMP SENSOR P RETURN AIR LUG PLUG SMOKE DETECTOR SMOKE DETECTOR SUPPLY AIR POWER Terminal strip TB34 energizes the thermostat components with 24VAC via TB1 OPERATION The main control module A55 proves the optional N O filter switch S27 indicates dirty filter when closed optional N O air flow switch S52 indicates no air i e broken belt system shuts down and optional C G A 50 C low ambient kit thermostat S59 used in C G A units only The main control module A55 receives data from the supply and return smoke detectors A17 and A64 optional phase protection monitor A42 blower motor overload relay S42 discharge sensor RT6 return air sensor RT16 and the outdoor air sensor RT17 The main control module A55 receives data from the electronic thermostat A2 Y1 Y2 W1 W2 G OCP and the sensor if economizer is used via terminal strip TB1 A55 energizes the appropriate components 1 2 REHEAT SCHEME SET PARAMETER 4 24 TO VALVE FOR SIMULTANEOUS HEATING AND COOLING 20 FOR DEHUMIDIFICATION CONTROL DESIGNATES OPTIONAL WIRING CLASS II FIELD WIRING WIRING DIAGRAM ACCESSORIES ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT FOR L SERIES UNITS TEMPERATURE CONTROL SECTION C2 Supersedes Form No New Form No 533 629W 534 390W 2003 Litho U S A 3 03 Page 86 L SERIES ECONOMIZ
74. E TESTING LINE GAS PIPING 4 amp SUPPORT FIGURE 28 1 Gas Piping Gas supply piping must not allow more than 0 5 W C 124 3 Pa drop in pressure between the gas meter and the unit Supply gas pipe must not be smaller than the unit gas connection Refer to installation instructions for de tails 2 Testing Gas Piping NOTE In case emergency shutdown is required off the main manual shut off valve and disconnect the main power to the unit These controls should be properly la beled by the installer When pressure testing gas lines the gas valve must be dis connected and isolated Gas valves can be damaged if subjected to more than 0 5 psig 14 W C 3481 Pa See figure 28 When checking piping connection for gas leaks use the preferred means Common kitchen detergents can cause harmful corrosion on various metals used in gas piping The use of specialty Gas Leak Detector is strongly recommended It is available through Lennox under part number 31B2001 See CORP 8411 L 10 for further details Do not use matches candles flame or any other source of ignition to check for gas leaks 3 Testing Gas Supply Pressure When testing gas supply pressure connect test gauge to the inlet pressure tap located on unit gas valve GV1 and or GV3 Test supply gas pressure with unit firing at maximum rate both stages energized Make sure the reading falls within the range of the following values Low pressure may resul
75. ER NF24 SR AF24 SR JOHNSON M9216 ML 72854 RANGE 2 10 VDC RANGE 2 10 VOC 0 05 se 2 48 G amp lt i 7 DELETE 7 AND 62 IF USED FOR EITHER GLOBAL ENTHALPY OR SENSIBLE TEMPERATURE CONTROL A FOR UNIT DIFFERENTIAL ENTHALPY CONTROL ADD A62 RETURN AIR ENTHALPY SENSOR DESCRIPTION KEY COMPONENT NOTE THIS DIAGRAM USED ONLY WHEN ECONOMIZER OR A7 SENSOR SOLID STATE ENTHALPY MOTORIZED OUTDOOR AIR DAMPERS ARE INSTALLED AS6 PANEL ECONOMIZER A62 SENSOR ENTHALPY INDOOR CONTROL REMOTE MIN WIRING DIAGRAM 8 97 72 CONTROL REMO EI er ACCES IES 104 JACK SENSOR OUTDOOR ENTHALPY 5 SERIES ECONOMIZER AND 5 HAC SENTIS i MOTORIZED OUTSIDE AIR DAMPER Ps PLUG UNIT ECONOMIZER P104 PLUG SENSOR OUTDOOR ENTHALPY ECONOMIZER SECTION DI 105 PLUG SENSOR RETURN AIR ENTHALP Supersedes Form No New Form No P LUG ECONOMIZER OUTPUT 531 713W 710 BI TERMINAL STRIP CLASS IT VOLTAG 1997 Lennox Industries Inc Litho U S A ORM SEQUENCE OF OPERATION L SERIES ECONOMIZER POWER 1 Terminal strip TB34 energizes the economizer components with 24VAC OPERATION 2 main control module A55 along with outdoor enthalpy sensor A7 and indoor enthalpy sensor A62 if differential enthalpy is used communicates to the economizer control module A56 when to power the damper motor B7 The economizer control module A56 supplies B7 wi
76. ESSOR AND REFRIGERANT CIRCUITS DETAIL LOW AMBIENT SWITCH S84 LOW AMBIENT SWITCH S11 BOTH FANS ARE ENERGIZED DRIERS WITH A Y1 DEMAND CONDENSER CONDENSER FAN 1 FAN 2 LOW PRESSUR SWITCH S87 LOW PRESSURE SWITCH S88 HIGH PRESSURE SWITCH 87 c COMPRESSOR B1 COMPRESSOR B2 STG 1 HIGH PRESSUR SWITCH 54 FIGURE 10 Page 41 LGC156 180 PLUMBING COMPRESSOR AND GE REFRIGERANT CIRCUITS DETAIL OF COIL LOCATED ON RETURN BEND 2 LOW AMBIENT SWITCHES S11 S84 S85 B2 STG 1 13 STG 2 0 Cora 0 DRIERS OPTIONAL SERVICE VALVE 3 C S98 S28 STAGE 1 CONDENSER COIL COMPRESSOR B1 AN STG 1 STAGE 2 DISCHARGE LINE EVAPORATOR COIL PRESSURE TAP HEEN p HIGH PRESSURE NW RESSURE GE L OW PRESSURE Lt SWITCH STAGE 2 CONDENSER COIL STAGE 1 EVAPORATOR COIL FIGURE 11 Page 42 LGC210 240 300 PLUMBING COMPRESSOR ONE FOR EACH STAGE AND REFRIGERANT CIRCUITS DETAIL OF COIL LOCATED ON RETURN BEND pa gt x 27 LOW AMBIENT SWITCH gt COMPRESSOR 1 5 1 STG 1 CONDENSER COIL STAGE 2 EVAPORATOR COI
77. ESSOR 1 K2 1 CONTACTOR COMPRESSOR 2 A55 K3 I CONTACTOR BLOWER RELAY 25 12 RELAY QUTDOOR FAN Q KILL JCONTACTOR COMPRESSOR 3 K65 1 2 RELAY EXHAUST FAN K RELAY OUTDOOR FAN 2 K149 1 RELAY OUTDOOR FAN 3 KI50 1 2 RELAY OUTDOOR FAN 4 460V 575V KI59 1 2 RELAY LOW AMBIENT SWITCH UNITS IPLUG PED P24 PLUG EXHAUST FAN P35 PLUG TEST HEAT P36 PLUG TEST COOL PLUG OUTDOOR FAN I PLUG OUTDOOR FAN 2 PLUG BLOWER DECK PLUG MOTOR OUTDOOR FAN 3 PLUG MOTOR OUTDOOR FAN 4 PLUG GAS OUTPUT PLUG COOLING SENSOR INPUT PLUG BLOWER 4 COOL T CONT PLUG SENSOR INPUT PLUG ECONOMIZER OUTPUT PLUG COMPRESSOR 2 PLUG COMP 3 4 4 CONTROL PLUG COMP amp 4 INPUT PLUG BIO EXHAUST FAN MOTOR PLUG BIT EXHAUST FAN MOTOR PLUG EXHAUST FAN 2 SVI ICH LIMIT HI PRESS COMP 1 SWITCH LIMIT HI_PRESS COMP 2 ISWITCH LOW PRESS LOW AMB KIT SWITCH LIMIT HI PRESS COMP 3 DVERLOAD RELAY BLOWER MOTOR SWITCH DISCONN CT SWITCH FREEZESTAT COMP 1 ISWITCH FREEZESTAT COMP 2 SWITCH FREEZESTAT COMP 3 E ee Ferorervrererererere ico co lune Kaka 4 24
78. GER TUBES INDUCED COMBUSTION AIR INDUCER TRANSITION INSHOT HEAT EXCHANGER BURNERS BAFFLE FLAME SENSOR ELECTRODE ORIFICE GAS MANIFOLD FIGURE 15 LGC 2 HEAT EXCHANGER one heat section shown HEAT EXCHANGER TUBE COMBUSTION AIR INDUCER lt 5 DYP 1 CK FLUE EXTENSION FIGURE 16 Page 48 LGC156 300 HEATING COMPONENTS LGC 1 UNITS SECONDARY LIMIT S100 COMBUSTION AIR BLOWER SECOND HEAT SECTION PROVE SWITCH S45 NOT SHOWN LGC 1 UNITS SECONDARY LIMIT 21 FIRST HEAT SECTION SECOND HEAT SECTION LGC 2 UNITS 510 AND 599 ON DRIP SHIELD BEHIND BLOWER HOUSING CONDENSER DIVIDER PANEL LGC 1 UNITS PRIMARY HIGH TEMP LIMIT S99 SECOND HEAT SECTION access patch plate is located LGC 1 UNITS PRIMARY on condenser divider panel HIGH TEMP LIMIT 510 FIRST HEAT SECTION COMBUSTION AIR BLOWER PROVE SWITCH 518 FIRST HEAT SECTION FIGURE 17 D GAS HEAT COMPONENTS See unit nameplate for all 1 model unit Btuh capacities See SPECIFICATIONS tables or unit namelplate for Btuh capacities in 2 model units LGC090 150 units have one heat section while LGC156 300 units are equipped with two identical gas heat sections gas heat section one and gas heat section two Flexible pipe will feed supply gas to both sections If for service the flex ible connection must broken hand tighten then turn additional 1 4 with a wrench for metal to metal seal do not overtighten
79. HP 7000 675 2 35 858 3 68 978 4 70 1005 4 95 8000 725 3 20 898 4 65 930 4 95 958 5 23 985 5 50 1013 5 80 1040 6 10 9600 811 487 845 522 1104 841 NOTE italics field furnished 1 30 to 2 40 in w g LGA LGC240 Air External Static in w g Volume cfm 1 30 1 40 1 50 1 60 1 70 1 80 1 90 2 00 2 10 2 20 2 30 2 40 RPM RPM RPM RPM RPM RPM RPM BHP RPM BHP RPM BHP BHP 6400 1008 4 53 1035 4 75 1060 4 98 1085 5 22 1110 5 45 1135 5 68 1157 5 91 11180 6 15 1202 6 40 1225 6 65 1246 6 88 1268 7 11 7500 1048 5 78 1075 6 05 11100 6 33 1125 6 60 1148 6 88 1170 7 15 1193 7 40 1215 7 65 1238 7 95 1260 8 25 1280 8 50 1300 8 75 8500 1085 7 10 1110 7 40 1135 7 73 1160 8 05 1183 8 35 1205 8 65 1228 8 95 1250 9 25 1270 9 55 1290 9 85 1310 10 15 1330 10 45 9600 1129 877 1154 913 1177 946 1199 9 78 1222 10 14 1244 1050 1267 10871289 11 28 AIR RESISTANCE w g Factory or Field Installed Options Gas Heat Exchanger Med Heat High Heat 0 02 Horizontal Filters Air Volume cfm Roof Curb MERV 11 MERV 15 Page 28 BLOWER DATA STANDARD 25 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT WITH STANDARD GAS HEAT WET INDOOR COIL amp AIR FIL TERS IN PLACE FOR ALL UNITS ADD 1 Any factory installed options air resistance high gas heat economizer etc
80. L DISCHARGE LINE SUCTION LINE PRESSURE TAP LOW PRESSURE SWITCH PRESSURE TAP 587 HIGH PRESSURE SWITCH S4 2 CONDENSER COIL STAGE 1 EVAPORATOR COIL FIGURE 12 Page 43 B Cooling Components All units use independent cooling circuits consisting of sepa rate compressors condenser coils and evaporator coils See figures 10 11 and 12 Four draw through type condens er fans are used in LGC156 300 units and two are used on LGC090 150 All units are equipped with belt drive blowers which draw air across the evaporator during unit operation Cooling may be supplemented by a factory or field installed economizer The evaporators are slab type and are stacked Each evaporator uses a thermostatic ex pansion valve as the primary expansion device Each evap orator is also equipped with enhanced fins and rifled tubing In all units each compressor is protected by a crankcase heater high pressure switch and low pressure switch Additional protection is provided by low ambient switches and freezes tats on each evaporator 1 Compressors B1 and 2 all units B13 LGC156 240 B20 LGC210 300 All LGCO090 300 units use scroll compressors LGC090 150 units use two compressors LGC156 and 180 use 3 compressors and LGC210 300 use four compres sors All compressors are equipped with independent cool ing circuits Compressor capacity may vary from stage to
81. LARMFH18 24 WARNING Refrigerant can be harmful if it is inhaled Refrigerant must be used and recovered responsibly Failure to follow this warning may result in person al injury or death IMPORTANT Units equipped with Humiditrol system MUST be charged standard cooling mode A Refrigerant Charge and Check WARNING Do not exceed nameplate charge under any condition This unit is factory charged and should require no further adjustment If the system requires charge reclaim the charge evacuate the system and add required nameplate charge NOTE System charging is not recommended below 60 15 C In temperatures below 60 F 15 C the charge must be weighed into the system If weighing facilities are not available or to check the charge use the following procedure 1 Attach gauge manifolds and operate unit in cooling mode until system stabilizes approximately five min utes Make sure all outdoor air dampers are closed 2 Check each system separately with all stages operat ing 3 Use a thermometer to accurately measure the outdoor ambient temperature 4 Apply the outdoor temperature to tables 4 through 27 and to determine normal operating pressures 5 Compare the normal operating pressures to the pres sures obtained from the gauges Minor variations in these pressures may be expected due to differences in installations Significant differences could mean that
82. LTERS IN PLACE FOR ALL UNITS ADD 1 Wet indoor coil air resistance of selected unit 2 Any factory installed options air resistance heat section economizer etc 3 Any field installed accessories air resistance duct resistance diffuser etc Then determine from blower table blower motor output and drive required See below for blower motors and drives See page Page 22 for wet coil and option accessory air resistance data BOLD INDICATES FIELD FURNISHED DRIVE Total Static Pressure in w g Pa Soltis 20 50 40 100 60 150 80 200 11 00 250 1 20 300 11 40 350 11 60 400 11 80 450 2 00 495 2 20 545 2 40 595 2 60 645 tus RPM RPM RPM RPM RPM RPM RPM BHP RPM RPM RPM BHP RPM RPM BHP RPM BHP kW kW kW kW kW kW kW kW kW kW kW kW kW 2250 455 0 301555 0 45 640 0 60 720 0 80 790 1 00 855 1 20 915 1 40 975 1 60 1030 1 85 1080 2 05 1130 2 30 1175 2 55 1220 2 80 1060 0 22 0 34 0 45 0 60 0 75 0 90 1 04 1 19 1 38 1 53 1 72 1 90 2 09 2500 475 0 40 575 0 55 660 0 70 735 0 90 805 1 10 870 1 30 930 1 55 985 1 75 1040 2 00 1090 2 25 1140 2 50 1185 2 75 1230 3 00 1180 0 30 0 41 0 52 0 67 0 82 0 97 1 16 1 31 1 49 1 68 1 87 2 05 2 24 2750 495 0 45 595 0 65 675 0 85 750 1 05 820 1 25 885 1 45 940 1 70 995 1 90 105
83. MTR 548 SWITCH DISCONNECT S49 SWITCH FREEZESTAT COMP 550 SWITCH FREEZESTAT COMP 2 584 SWITCH LOW PRESS LOW AMB COMP 2 24v 587 SWITCH LOW PRESS COMMON 588 SWITCH LOW PRESS COMP 2 TRANSFORMER CONTROL 1813 TERMINAL STRIP POWER DISTRIB TB34 TERMINAL STRIP TRANS TI Lio 0 DENOTES OPTIONAL COMPONENTS al N EQUIP GROUND 120 1 60 GROUND NOTE USE COPPER CONDUCTORS ONLY A IF ANY WIRE IN THIS APPLIANCE IS REPLACED MUST BE REPLACED WITH WIRE OF LIKE SIZE RAT AND INSULATION THICKNESS DISCONNECT ALL POWER BEFORE SERVICING THERMOSTAT HEAT ANTICIPATION SETTING 0 1 AMP WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES NOTE FOR USE WITH COPPER CONDUCTORS ONLY REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE USED ON VOLTAGE UNITS AND UNITS WITH HIGH EFFICIENCY MOTORS Page 77 EXHAUST FAN LINE VOLTAGE FIELD INSTALLED NEC CEC CLASS NOTE ALL REMAINING WIRES FACTORY INSTALLED WIRING DIAGRAM 2 05 COMBINATION PACKAGED ROOF LCA LGA 090 102 120H 6 J M Y LCC L6C 090 102 120 1508 6 J M Y HEAT COOL SEC
84. NIT PLUG JUMPER BLOWER PROVING OPERATION IS DESIRED UNIT REMAINS IN JACK A2 RETURN_AIR_SENSOR LUG ECONOMI ZER HARNESS OCCUPIED OPERATION WITH JUMPER JACK RTI DISCH AIR SENSOR SENSOR A55 DISCHARGE IMC 19 IS SERVICE RELAY OUTPUT 24VAC JACK 527 FILTER SWITCH SENSOR RETURN AIR TEMP IF USED CONNECT INDICATOR LIGHT JACK 552 FAN SWITCH SENSOR OUTSIDE AIR TEMP OR RELAY COIL MAX 4VA JACK COOL I SWITCH FILTER JACK NTERF ACE DISCHARGE TEMP SENSOR OVERLOAD RELAY BLOWER MOTOR J99 P99 JIOO P100 AND JI03 P103 ARE NOT USED JACK RETURN TEMP SENSOR SWITCH AIR FLOW ON 036 042 048 060 072 088 AND 100 UNITS JACK SWITCH DEHUMIDISTAT 65F 8601 ALTERNATE REMOTE LOCATION OF RT6 SMOKE DETECTOR RETURN AIR JACK SMOKE DETECTOR SUPPLY AIR TERMINAL STRIP 24V CLASS II USE 586 DEHUMIDISTAT AND 855 RELAY KOR GET TONAL e JACK SENSORS CONTROL JACK THERMOSTAT INPUT JACK NG SENSOR INPUT JACK BLOWER 4 COOL CONTROL JACK SENSOR INPUT JACK ECONOMI ZER OUTPUT lo aie JACK BLOWER PROVING JACK JUMPER BLOWER PROVING JACK ECONOMIZER HARNESS RELAY TRANSFER 2 PLUG UNIT PLUG 527 FILTER SWITCH PLUG 550 FAN SWITCH PLUG COOL ONE R PLU
85. NOTE Do not use thread sealing compound on flex pipe flare connections 1 Control Box Components A3 A12 A55 A58 T3 T13 K13 and K19 A WARNING Shock hazard Spark related compo nents contain high voltage which can cause personal injury or death Discon nect power before servicing Control is not field repairable Unsafe operation will result If control is inoperable sim ply replace the entire control The main control box see figure 4 houses the controls and A12 main control module A55 gas valve burner con trol module A58 combustion air blower transformers T3 and T13 combustion air blower relay K13 and second heat sec tion relay K19 For description of the components see sec tion A more detailed description of burner controls and A12 is given below Burner Ignition Control A3 all units and A12 LGC156 300 The ignition controls are located in the control box and are manufactured by Johnson Controls See table 1 for LED codes The ignition control provides three main functions gas valve control ignition and flame sensing The unit will usually ignite on the first attempt however the ignition at tempt sequence provides three trials for ignition before locking out The lockout time for the Johnson control is 5 min utes After lockout the ignition control automatically resets and provides three more attempts at ignition Manual reset after lockout requires breaking and
86. NTROL USED ON 6 TON AND SMALLER UNITS D PLUG N 510 521 HOOKUP FOR 056 TO 072 UNITS S 5 BLACK 040 D lt NJI Co WITCH LIMIT PRIMARY G EE PROVE 510 HOOKUP FOR 090 TO 150 UNITS SWITCH LIMIT SECONDARY GAS HEAT A T3 USED ON 575V UNITS ONLY SWITCH FLAME ROLLOUT BURNER THERMOSTAT 35 OPEN 50 C THERMOSTAT 23C CL 7 _OP S0C_LOW AWB KIT WIRING DIAGRAM HERMOSTAT 24C_OPEN 50 LOW AMB KIT TRANSFORMER COMB AIR BLOWER COMBINATION UNIT ROOF TOP TRANSFORMER 5OC LOW AMBIENT KIT GAS HEAT FOR TERMINAL STRIP TRANSFORMER wies E TERMINAL STRIP TRANSFORMER 118 L SERIES 75 THRU 255 UNITS B BOX HEATING SECTION AI Supersedes Form No New Form No 533 904W 534 441W 2003 Litho U S A Pale 2 ofo UT m gt I Ul 4 05 07107 fo Page 79 SEQUENCE OF OPERATION LGC090 150 First Stage Heat 1 Heating demand initiates at W1 in the thermostat 2 24VAC is routed through TB34 to the main control module A55 After A55 proves N C primary limit S21 the combustion air blower relay K13 is energized 3 N O K13 1 contacts close allowing line voltage to en ergize combustion air blower B
87. Out Test Humiditrol operation using the following procedure 1 Make sure RH sensor is wired as shown in figure 44 or 45 Set IMC ECTO system mode parameter 6 01 to option 0 default local thermostat mode Set IMC ECTO reheat setpoint parameter 4 25 to op tion 0 relative humidity 1 4 Jumper the following TB1 terminals 7 amp 8 occupied mode 6 amp 3 blower demand G 6 amp 18 1 cooling demand On 156 and 180 units the blower compressor 1 and compres sor 2 reheat and compressor 3 cooling should be operat ing On 210 240 and 300 units the blower compressor 1 and compressor 2 reheat and compressor 3 and 4 cooling should be operating L14 and L30 LED s on the A67 board should also be ON indicating the reheat valves are energized 5 Disconnect the jumper between TB1 terminals 6 amp 18 Y1 to end the cooling demand 6 Press the IMC pushbutton to by pass the compressor minimum run delay 156 and 180 Units Compressor 3 cooling should de energize compressor 1 and 2 reheat should continue to operate and L14 and 130 LED s should still be ON 210 240 and 300 Units Compressor 3 and 4 cooling should de energize com pressor 1 and 2 reheat should continue to operate and L14 and L30 LED s should still be ON 7 Disconnect the jumper between TB1 terminals 788 occupied mode Compressor 1 and 2 reheat should de energize L14 and L30 LED s should go OFF
88. Page 65 LAGED AND LAPEF INSTALLATION ECONOMIZER FRESH AIR POWER EXHAUST FAN ASSEMBLY LAGED GRAVITY EXHAUST DAMPERS FIGURE 35 G LAPEF Power Exhaust Fans all units LAPEF10 15 available for LGCO90S 150S units and LAPEF 18 24 available for LGC156 300 units are power exhaust fans used in downflow applications only LAPEF fans requires op tional down flow gravity exhaust dampers and LAREMD economizers Power exhaust fans provide exhaust air pres sure relief and also run when return air dampers are closed and supply air blowers are operating Figures 34 and 35 show location of the LAPEF See installation instructions for more detail H Optional Cold Weather Kit Canada only Electric heater is available to automatically control the minimum temperature in the gas burner compartment Heater is C G A certified to allow cold weather opera tion of unit down to 60 F 50 C The kit includes the following parts 1 Transformer T20 is a 600 to 120 240V stepdown trans former mounted in the blower compartment 2 T20 has two in line fuses F20 one on each leg of the trans former Both are rated at 15 amps 3 The strip heater HR6 is located as close as possible to the gas valve It is wired in series with T20 The strip heater is rated at 500 Watts 4 Athermostat mounting box is installed on the vesti bule of the heating compartment Included in the box are the following thermostat switches a Thermostat switch
89. R MODE ECTO 6 01 OPTION 1 2 OR 3 TB1 12345 6 8 9 101112131415 1617 19 20 21 Connect _ shield drain to it TB1 16 Terminals are located on combination RH temperature sensors only A2 sensor is not required when combina tion sensor is used A91 HUMIDITY Connect SENSOR shield drain to unit TB1 7 FIGURE 45 Page 75 TABLE 35 REHEAT OPERATION Two Stage Thermostat Default 156 8 180H 3 Compressors 210H 8 3005 4 Compressors Reheat Only Compressor 1 amp 2 Reheat Compressor 1 amp 2 Reheat Reheat amp Y1 Compressor 1 amp 2 Reheat and Compressor 1 amp 2 Reheat and Compressor 3 Cooling Compressor 3 amp 4 Cooling Reheat 8 Y2 Three Stage Thermostat Transfer relay required Reheat Only Reheat amp Y1 Compressor 1 amp 2 Reheat and Compressor 1 amp 2 Reheat and Compressor Cooling Compressor Cooling Reheat Y1 8 Y2 Compressor 1 amp 2 Cooling 212 Reheat YT amp Y2 8 Reheat Only Reheat amp Compressor 1 amp 2 Reheat and Compressor 1 amp 2 Reheat and Compressor 3 Cooling Compressor Cooling Compressor 1 amp 2 Reheat Reheat amp 1 amp 2 Compressor 1 amp 2 Cooling Compressor 3 amp 4 Cooling2 Reheat amp Y1 amp Y2 amp Y3 Compressor 1 2 amp 3 Cooling Compressor 1 2 amp 3 Cooling Reheat amp Y1 amp Y2 amp Y3 amp Y4 Compressor 1 2 amp Cooling
90. RCUIT1 CIRCUIT2 CIRCUIT3 Coil Dis Suct Suct Dis Coil Entering 10 5 10 5 10 Entering Air Temp Air psig psig psig psig psig psig i Air 65 F OUTDOOR FAN CYCLES 75 171 77 168 81 75 F 85 _ 196 78 194 82 9526 228 79 227 84 eer 262 SE 301 82 86 10 LGC156H with Humiditrol Outdoor CIRCUIT 1 CIRCUIT 2 CIRCUIT 3 Outdoor CIRCUIT 1 CIRCUIT 2 CIRCUIT 3 CIRCUIT 4 Entering 015 Suct Dis Suc Dis Suc Coil En Dis Suc Dis Suc Dis Suc Dis Suc tering 10 10 10 5 10 Air 10 5 10 5 10 5 Air Temp Psig psig psig psig psig psig psig pid Temp psig psig psig psig psig psig 65 F 187 70 187 78 194 72 75 F 216 79 222 74 85 F 79 256 76 se as pre are a wo 78 15 F 309 82 305 86 309 86 115 F 357 80 355 TABLE 11 TABLE 15 LGC180S LGC210H CIRCUIT 2 CIRCUIT 3 Outdoor Fan Cycles 65 F 75 F 184 77 183 81 180 82 212 78 210 82 206 83 Outdoor Outdoor Coil Dis Suct Dis Suc Dis Suc Coil En Dis Suc Dis Suc Dis Suc Dis Suc Entering 10 5 10 5 10 55 tering 10 25 10 5 10 5 10 55 Air Temp PSig psig psig psig psig psig Air Temp Psig psig psig psig psig psi
91. S All 7 5 through 25 ton 29 8 through 88 kW units are config ure to order units CTO The LGC unit components are shown in figures 1 and 2 All units come standard with hinged unit panels The unit panels may be held open with the door rod located inside the unit All L1 L2 and L3 wiring is color coded L1 is red L2 is yellow and L3 is blue A Control Box Components ELECTROSTATIC DISCHARGE ESD Precautions and Procedures A CAUTION Electrostatic discharge can affect electronic ponents Take precautions during unit installation and service to protect the unit s electronic con trols Precautions will help to avoid control expo sure to electrostatic discharge by putting the unit the control and the technician at the same electro static potential Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface such as the gas valve or blower deck be fore performing any service procedure control box components are shown in figures 3 and 4 The control box is located in the upper left portion of the compressor compartment 1 Disconnect Switch 548 Optional all units All units may be equipped with an optional disconnect switch 548 Other factory or field installed optional circuit breakers may be used such as CB10 548 and CB10 are toggle switches which can be used by the service technician to dis connect power to the unit 2 Control Transformer 1 all units All u
92. SSOR 4 JACK PED lo on esi MOTOR OUTDOOR FAN JACK EXHAUST EXHAUST FAN MOTOR LCA LGA 210 240 3005 6 J M Y MOTOR OUTDOOR FAN JACK TEST HEAT JACK EXHAUST FAN 3 LCC LGC 210 240 300S G J M Y ICAPACT TOR OUTDOOR MACK TEST COOL CONTACTOR COMPRESSOR ICAPACITOR OUTDOOR UACK OUTDOOR FAN CONTACTOR COMPRESSOR 2 HEAT COOL SECTION B7 CAPACI TOR EXHAUST JACK OUTDOOR FAN 2 gt Ga N EERE CONTACTOR BLOWER Supersedes Form No New Form No CAPAC1TOR EXHAUST JACK BLOWER DECK CAPACI TOR OUTDOOR JACK MOTOR OUTDOOR FAN 5 HORS 535 902W 580 LINN 006 012 91 Sequence of Operation LGC156 300 Power 1 Line voltage from TB2 unit disconnect S48 or other factory or field installed optional power disconnects such as CB10 energizes transformer T1 and 18 Transformer T1 provides 24VAC power to terminal strip TB34 and T18 provides 24VAC power to terminal strip TB35 The two terminal strips provide 24VAC power to the unit cooling heating and blower controls and thermostat 2 Terminal strip TB13 is also energized when the unit dis connect closes TB13 supplies line voltage to com pressor crankcase heaters compressors blower motors and fan motors Blower Operation OCP input must be on 3 The main control m
93. TION B5 Supersedes Form No New Form No 533 912W 534 358W 2003 Litho U S A 90 150 SEQUENCE OF OPERATION Power 1 Line voltage from unit disconnect energizes transformer 1 T1 provides 24VAC power to terminal strip TB34 TB34 provides 24VAC to the unit cooling heating and blower controls TB13 is also energized when unit disconnect switch closes TB13 provides line voltage to compressors crankcase heaters compressor contactors the blower motor contactor and condenser fan relay Blower Operation 3 The main control module receives a demand from thermostat terminal G A55 energizes blower contactor K3 with 24VAC 4 K3 1 closes energizing blower B3 Economizer Operation 5 The economizer control module A56 receives a demand and energizes exhaust fan relay K65 with 24VAC at 50 outside air damper open adjustable 6 K65 1 and K65 2 both close energizing exhaust fan motor B10 1st Stage Cooling compressor B1 First stage cooling demand energizes Y1 and G in the thermostat G energizes blower 24VAC is routed through TB34 to the main control module A55 After A55 proves N C low pres sure switch S87 N C freezestat S49 and N C high pressure switch S4 compressor contactor K1 is energized N O contacts K1 1 close energizing compressor B1 low ambient switch S11 closes to energize condenser fan relay K10 57 energizes con denser fan relay K68 N O contac
94. V COMMON WARNING ELECTRIC SHOCK CAUSE INJURY THERMOSTAT HEAT ANTICIPATION SETTING 0 1 AMP OR DEATH UNIT MUST BE GROUNDED IN IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT KEY COMPONENT ACCORDANCE WITH NATIONAL AND LOCAL CODES wuel BE REPLACED WITH WIRE OF LIKE SIZE RATING I a4_ SWITCH LOW PRESS LOW AMS COMP 2 DISCONNECT ALL POWER BEFORE SERVICING AND INSULATION THICKNESS 585 SWITCH LOW PRESS LOW 3 GEET A NOTE FOR USE WITH COPPER CONDUCTORS ONLY REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT 598 _ SWITCH LOW PRESS COMP 5 5117 SWITCH GF I AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE TI TPRANGEORMER CONTROL 118 TRANSF ORMER CONTACTOR 1129 TRANSFORMER GF T TBIS TERMINAL STRIP POWER DISTRIB 1 54 TERMINAL STRIP TRANS TB35 TERMINAL STRIP TRANS 118 DESCRIPTION LINN 081 8 941291 542 USED ON M VOLTAGE UNITS AND UNITS WITH HIGH EFFICIENCY MOTORS F6 AND FIO FUSES ARE USED ON Y VOLTAGE UNITS ONLY 50 1 HO EQUIP GROUND JIOZKI LINE VOLTAGE FIELD INSTALLED NEC CEC CLASS NOTE ALL REMAINING WIRES FACTORY INSTALLED mm DENOTES OPTIONAL COMPONENTS DESCRIPTION 9 9
95. ace area sq ft m total Coils Tube diameter in mm Number of rows Fins per inch m Condenser Motor horsepower W Fans Motor rpm Total Motor watts Diameter in mm No of blades Total Air volume cfm L s Evaporator Net face area sq ft m total Coils Tube diameter in mm No of rows Fins per inch m Drain connection number and size Expansion device type 3 Indoor Nominal motor output Blower and Drive Selection Maximum usable motor output Only Motor Drive kit Blower wheel nominal diameter x width Filters Type of filter No and size in mm 15 Ton LGC180S2B Standard 186 000 54 5 180 000 52 7 6000 2830 18 0 10 0 10 6 9 Ibs 0 oz 4 08 kg 9 Ibs 0 oz 4 08 kg 9 Ibs 0 oz 4 08 kg Low Standard Medium High 1 Stage 2 Stage 2 Stage 2 Stage 169 000 49 5 169 000 49 5 234 000 68 6 312 000 91 4 260 000 76 2 360 000 105 5 480 000 140 6 208 000 60 9 288 000 84 4 384 000 112 5 80 0 1 9 1 7 11 in w g 2 7 kPa 56 5 5 25 3 8 9 5 1 20 787 4 1 3 249 1075 1370 4 24 610 3 15 850 7480 22 3 2 07 3 8 9 5 3 14 651 1 1 in NPT coupling Balanced Port Thermostatic Expansion Valve removeable power head 3 hp 2 2 kW 5 hp 3 7 kW 7 5 hp 5 6 kW 3 45 hp 2 6 kW 5 75 hp 4 3 kW 8 63 hp 6 4 kW 3 hp 535 725 1 685 865 2 685 865
96. acity with power exhaust 76 82 89 37 40 43 30 32 35 Disconnect 84M13 15 TON HIGH EFFICIENCY R 22 LGC180H2 Voltage 60hz 3 phase 208 230 575 Compressors Rated Load Amps total 17 3 51 9 9 27 7 1 21 3 3 Locked Rotor Amps total 123 369 62 186 50 150 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 6 2 1 4 Motors 4 Locked Rotor Amps total 4 7 188 24 9 6 1 9 7 6 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 24 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 4 8 1 9 3 8 Service 1159 GFI 75 Amps Indoor Blower Horsepower 3 5 7 5 3 5 7 5 3 5 7 5 Motor Rated Load Amps 106 167 242 4 8 7 6 11 3 9 6 1 9 Locked Rotor Amps 66 105 152 268 456 66 234 366 54 T Maximum Unit only 90 90 110 45 50 50 35 40 45 Geh with power exhaust 90 100 110 50 50 50 40 40 45 2 Minimum Circuit Unitonly 77 83 91 40 43 46 31 34 37 with power exhaust 82 88 95 42 45 49 33 36 39 Disconnect Dm D E 15 TON HIGH EFFICIENCY R 410A LGC180H4 Voltage 60hz 3 phase 208 230V 460V 575V Compressors Rated Load Amps total 15 6 46 8 7 8 23 4 5 8 17 4 Locked Rotor Amps total 110 330 52 156 38 9 116 7 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 5 2 144 Motors 4 Locked Rotor Amps total 4 7 18 8 24 9 6 1 9 7 6 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 24
97. activates gas valve the spark electrode and the flame sensing electrode Sparking stops immediate ly after flame is sensed The combustion air blower continues to operate throughout the heating demand If the flame fails or if the burners do not ignite the ignition control will attempt to ignite the burners up to two more times If ignition cannot be obtained after the third attempt the control will lock out The ignition control is not adjustable Johnson Page 49 2 Heat Exchanger Figures 15 and 16 The LGC units use aluminized steel inshot burners with matching tubular aluminized stainless steel is an option steel heat exchangers and two stage redundant gas valves LGC090 150 uses one eleven tube burner for high heat and one six tube burner for standard heat LGC156 300 use two eleven tube burners for high heat and two six tube burners for standard or low heat LGC156 300 2 units use two nine tube burners for medium heat Burners in all units use a burner ven turi to mix gas and air for proper combustion Combustion takes place at each tube entrance As hot combustion gases CLOSED OFF OPEN SECONDS 05 30 35 are drawn upward through each tube the combustion air blower exhaust gases are drawn out the top and fresh air gas mixture is drawn in at the bottom Heat is transferred to the air stream from all surfaces of the heat exchanger tubes The supply air blowers controlled by the main control
98. ar Control Guide sent with each unit 17 Main Control Module A55 all units The main control module A55 is the heart of the system It controls one compressor one two stage gas valve one bank of electric heat one outdoor fan and one blower A55 includes the thermostat inputs serial communica tions ports diagnostic code display control pushbutton sys tem configuration dp switches and four expansion ports A diagnostic code list is located on the back side of the left ac cess panel P111 112 ROOM THERMOSTAT A2 P113 18 Compressor 2 Control Module A57 The compressor 2 control module A57 controls one addi tional compressor stage for the LGC units A57 includes all inputs and outputs required for compressor and fan control compressor stages diagnostics and low ambient control 19 Compressor 3 amp 4 Control Module A59 LGC156 300 The compressor 3 amp 4 control module A59 controls two addi tional compressor stage for the LGC156 300 units 59 in cludes all inputs and outputs required for compressor and fan control compressor stage diagnostics and low ambient con trol 20 Gas Valve Control Module A58 LGC156 300 The gas valve control module 58 controls an additional burn er with a two stage gas valve A58 includes all inputs and out puts required for control and diagnostics of one two stage gas valve burner 21 Economizer Control Module A56 Economizer only The economizer control module A56 contr
99. arge An approach tem perature less than value shown indicates an over charge 10 Do not use the approach method if system pressures do not match pressures in tables 5 through 18 The ap proach method is not valid for grossly over or under charged systems IV STARTUP OPERATION Refer to startup directions and to the unit wiring diagram when servicing See unit nameplate for minimum circuit ampacity and maximum fuse size A Preliminary and Seasonal Checks 1 Make sure the unit is installed in accordance with the installation instructions and applicable codes 2 Inspect all electrical wiring both field and factory installed for loose connections Tighten as required Refer to unit diagram located on inside of unit control box cover 3 Check to ensure that refrigerant lines are in good condition and do not rub against the cabinet or other refrigerant lines 4 Check voltage Voltage must be within the range listed on the nameplate If not consult power company and have the voltage corrected before starting the unit TABLE 28 APPROACH ee RES L Series Liquid ens Minus Ambient Temp Unit 1st Stage 2nd Stage 3rd Stage 4th Stage TER 1 1 OF 1 4 4 C 0 5 44 0 5 5 C 0 5 1805 ore 180H Ge Ger BF 1 1 TF 1 F 44 05 44 305 3 9 C 0 5 5 C 0 5 E 1 1 1 BF 1 3 9 C 05 28 05
100. at the front of this manual for specifications of condenser fans used in all units All condenser fans used have single phase motors The fan assembly may be removed for servicing and cleaning C Blower Compartment The blower compartment in all LGC090 150S units is lo cated between the evaporator coil and the condenser coil sec tion The blower assembly is accessed by disconnecting the blower motor and all other plugs and removing the screws in front of the blower housing The blower pulls out as shown in figure 13 The blower compartment in LGC156 300 units is located between the evaporator coil and the compressor control sec tion on the opposite side of the condenser coil The blower as sembly is accessed by disconnecting the blower motor jack plug J98 P98 and all other plugs and removing the screws on either side of the sliding base The base pulls out as shown in figure 14 Page 45 1 Blower Wheels All LGC090 150 units have one 15 in 15 in 381 mm 381 mm blower wheel All LGC156 300 units have two 15 in x 15 in 381 mm 381 mm blower wheels Both wheels are driven by one motor 2 Indoor Blower Motor B3 All units use three phase single speed blower motors CFM adjustments are made by adjusting the motor pulley sheave Motors are equipped with sealed ball bearings All motor spec ifications are listed in the SPECIFICATIONS table of con tents in the front of this manual Units may be equipped with motors
101. center mullion 3 Remove gas valve manifold assembly and burners 4 Remove combustion air inducer and flue box Pay careful attention to the order in which gaskets and ori fice are removed 5 Support heat exchanger to prevent it from falling when final screws are removed 6 Remove screws supporting heat exchanger 7 To install heat exchanger reverse procedure Be sure to secure all wires and check plumbing and burner plate for airtight seal Screws must be torqued to 35 in lbs to ensure proper operation 9 Flame Sensing Flame current is an electrical current which passes from the ignition control through the sensor electrode during unit op eration The current passes from the sensor through the flame to the ground electrode located on the flame elec trode to complete a safety circuit The electrodes should be located so the tips are at least 1 2 12 7 mm inside the flame envelope Do not bend electrodes To measure flame current follow the procedure on the following page NOTE Electrodes are notfield adjustable Any alter ations to the electrode may create a hazardous con dition that can cause property or personal injury 1 Disconnect power to unit 2 Remove lead from sensing electrode and install a 0 50DC microamp meter in series between the sens ing electrode and the sensing lead 3 Reconnect power and adjust thermostat for heating demand 4 When flame is established compare reading to table 30 Do not
102. ch is shown on the temperature control section C2 wiring diagram in back of this manual M Indoor Air Quality CO2 Sensor A63 The indoor air quality sensor monitors levels and re ports the levels to the main control module A55 The board adjusts the economizer dampers according to the CO2 levels The sensor is mounted next to the indoor thermo stat or in the return air duct Refer to the indoor air quality sensor installation instructions for proper adjustment Wiring for the indoor air quality switch is shown on the tem perature control section C2 wiring diagram in back of this manual N LP Propane Kit LGC090 150 units require one natural to LP propane kit while LGC 156 300 units require two one for each gas heat section The kit includes one gas valve eleven burner orifices and three stickers For more detail refer to the natural to LP gas changeover kit installation instructions O Factory Installed Humiditrol LGC120S 1505 Humiditrol units provide a dehumidifying mode of opera tion These units contain a reheat coil adjacent to and downstream of the evaporator coil Reheat coil solenoid valve L14 routes hot discharge gas from the compressor to the reheat coil Return air pulled across the evaporator coil is cooled and dehumidified the reheat coil adds heat to supply air See figure 36 for reheat refrigerant routing and figure 37 for standard cooling refrigerant routing Page 67 REHEAT MODE REFRIGERANT
103. cted to the ignition control by a 8 mm silicone insulated stranded high voltage wire The wire uses 1 4 6 35 mm female quick connect on the electrode end and female spark plug type terminal on the ignition control end NOTE IN ORDER TO MAXIMIZE SPARK ENERGY TO ELECTRODE HIGH VOLTAGE WIRE SHOULD TOUCH UNIT CABINET AS LITTLE AS POSSIBLE 125 015 3 2 mm A mm ELECTRODE GROUND GROUND FIGURE 24 12 Flame Sensors A flame sensor is located on the right side of each burner support The sensor is mounted through a hole in the burn er support and the tip protrudes into the flame envelope of the right most burner The sensor assembly is fastened to burner supports and can be removed for service without removing any part of the bumers ELECTRODE When flame is sensed by the flame sensor indicated by microamp signal through the flame sparking stops imme diately During operation flame is sensed by current passed along the ground electrode located on the spark electrode through the flame and into the sensing elec trode The ignition control allows the gas valve to stay open as long as a flame signal current passed through the flame is sensed SENSOR FIGURE 25 Page 53 II PLACEMENT AND INSTALLATION Make sure the unit is installed in accordance with the installation instructions and all applicable codes See accessories section for conditions requiring use of the optional roof mounting frame LARMF18 36 or
104. d for R410A refrigerant See unit nameplate Operating pressures and pressure switch set tings are significantly higher than R22 charged units Ser vice equipment must be rated for R410A All LGC units are designed to accept any of several different energy management thermostat control systems with mini mum field wiring Factory or field provided control options connect to the unit with jack plugs When plugged in the controls become an integral part of the unit wiring Information contained in this manual is intended for use by qualified service technicians only All specifications are sub ject to change Procedures outlined in this manual are pre sented as a recommendation only and do not supersede or replace local or state codes If the unit must be lifted for service rig unit by attaching four cables to the holes located in the unit base rail two holes at each corner Refer to the installation instructions for the proper rigging technique AWARNING Electric shock hazard Can cause injury or death Before attempting to perform any service or maintenance turn the electrical power to unit OFF at discon nect switch es Unit may have multiple power supplies Table of Contents Specifications 2 Optional Accessories 10 Electrical Data 12 3 spise 13 Blower tne 21 Parts Arrangement
105. d to imme diately shut off gas supply CAUTION For safety connect shut off valve between the manometer and the gas tap to permit shut off of gas pressure to the manometer Manifold Adjustment Procedure 1 Connect test gauge to the outlet pressure tap on the gas valve Start the unit call for second stage heat and allow five minutes for the unit to reach steady state 2 While waiting for the unit to stabilize notice the flame The flame should be stable without flashback and should not lift from the burner heads Natural gas should burn basically blue with some clear streaks L P gas should burn mostly blue with some clear yellow streaks Page 60 3 After allowing the unit to stabilize for five minutes cord the manifold pressure and compare to the values given in table 3 CAUTION Disconnect heating demand as soon as rate reading has been obtained 5 Proper Gas Flow To check for proper gas flow to burners determine Btuh in put from unit rating plate or the gas heating capacity in the SPECIFICATIONS tables Divide this input rating by the Btuh per cubic foot of available gas Result is the number of cubic feet per hour required Determine the flow of gas through gas meter for two minutes and multiply by 30 to get hourly flow of gas to the burners NOTE To obtain accurate reading shut off all other gas appliances connected to meter 6 Inshot Burner Burners are factory se
106. djustable The control makes three attempts at igni tion and then locks out the system if ignition is not obtained af ter the third trial Reset after lockout requires only breaking and remaking thermostat demand The control shuts off gas flow immediately in the event of a gas or power failure Upon restoration of gas and power the control will restart the ignition sequence and continue until flame is estab lished or system locks out For a more detailed description see the Gas Heat Components section 15 Power Exhaust Relay K65 PED units Power exhaust relay K65 is DPDT relay with a 24VAC coil K65 is used in all LGC units equipped with the optional power exhaust dampers K65 is energized by the economizer control panel A56 after the econo mizer dampers reach 50 open adjustable in ECTO When K65 closes the exhaust fans B10 and B11 are en ergized 16 Blower Motor Overload Relay 542 units with high efficiency motors amp standard efficiency motors of 7 5 HP and above The blower motor overload relay is used in all L series units equipped with high efficiency motors as well as units with standard efficiency motors 7 5 HP and higher The relay S42 is connected in line with the blower motor to monitor the cur rent flow to the motor When the relay senses an overload con dition a set of normally closed contacts open to de energize pin 9 in plug 110 of the A55 main control module A55 de en ergizes all outputs Units
107. e evaporator blower motor heat deduction Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum external duct static pressure Integrated Part Load Value tested at 80 F 27 C outdoor air temperature Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Kit 2 is used with high efficiency 3 HP motor only gt 7 SPECIFICATIONS LGC210S General Nominal Tonnage Data Model No Efficiency Type Gross Cooling Capacity Btuh kW 1 Net Cooling Capacity Btuh kW ARI Rated Air Flow cfm L s Total Unit Power kW 1 EER Btuh Watt 2 Integrated Part Load Value Btuh Watt Refrigerant Charge Circuit 1 Furnished R 22 Circuit 2 Circuit 3 Circuit 4 Heat Input Type Cooling Performance Gas Heating Performance Input Btuh KW First Stage Second Stage First Stage Second Stage CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural LPG Propane Output Btuh kW Compressor
108. eat two stage cool thermostat with dual temperature levers A non switching or manual system switch subbase may be used 2 Electronic thermostat see price book Any two stage heat two stage cool electronic ther mostat may be used 3 Honeywell T7300 thermostat 81659 The Honeywell T7300 thermostat is a programmable in ternal or optional remote temperature sensing thermo stat The T7300 provides occupied and unoccupied changeover control J Smoke Detectors A17 and A64 Photoelectric smoke detectors are a factory installed op tion The smoke detectors can be installed in the supply air section A64 return air section A17 or in both the supply and return air section Wiring for the smoke detectors are shown on the temperature control section C2 wiring dia gram in back of this manual K Blower Proving Switch 552 The blower proving switch monitors blower operation and locks out the unit in case of blower failure The switch is N O and closes at 14 W C 34 9 Pa The switch is mounted on the upper left hand corner of the blower deck Wiring for the blower proving switch is shown on the tempera ture control section C2 wiring diagram in back of this manual L Dirty Filter Switch S27 The dirty filter switch senses static pressure increase indi cating a dirty filter condition The switch is N O and closes at 1 W C 248 6 Pa The switch is mounted on the top filter channel corner Wiring for the dirty filter swit
109. en j d P175 HUMIDITROL FLASHING GREEN HEARTBEAT LED INDICATES NORMAL OPERATION T T A67 RH1 REHEAT CONTROL BOARD UNDERNEATH YELLOW LED INDICATES OUTPUT TO L14 REHEAT VALVE YELLOW LED INDICATES OUTPUT TO L30 REHEAT VALVE JO FIGURE 39 Page 71 m REHEAT MODE REFRIGERANT ROUTING m 156H amp 180H UNITS STAGE 2 EVAPORATOR COIL Note Two refrigerant circuits are shown both circuits operate during reheat STAGE 1 EVAPORATOR COIL VALVES CIRCUIT 1 CONDENSER EXPANSION CIRCUIT 2 CONDENSER COIL REHEAT VALVE SUE Note Two refrigerant circuits are shown both circuits operate when EXPANSION there is a first stage thermostat de STAGE 1 VALVES mand default EVAPORATOR Ee CIRCUIT 1 CONDENSER CIRCUIT 2 CONDENSER COIL Page 72 REHEAT MODE REFRIGERANT ROUTING 210 amp 3005 UNITS 5 2 T EVAPORATOR Note Two refrigerant circuits are shown both circuits operate during reheat EXPANSION VALVES CIRCUIT 2 CONDENSER COIL CIRCUIT 1 CONDENSER COIL REHEAT VALVE CHECK COOLING MODE REFRIGERANT ROUTING 210H amp 300S UNITS STAGE2 Note Two refrigerant circuits are EVAPORATOR shown both circuits operate when there is a first stage thermostat de EXPANSION mand default VALVES CIRCUIT 2 CONDENSER COIL Y 2 CONDENSER COIL FIGURE 43 Page 73 Check
110. er Order Hood Separately 18 24 16095 9 9 09 Outdoor Air Hood down flow Number of Filters C1HOOD10C 1 3 85M25 9 9 0 16 x 25 x 1 in Economizer Controls Differential Enthalpy C1SNSRO7AE1 86 3 9 Single Enthalpy C1SNSROGAE1 86 32 9 Global Enthalpy Sensor Field Provided Factory Differential Sensible Furnished Factory Barometric Relief Down Flow Barometric Relief Dampers Order Hood LAGED18 24 16K98 9 9 0 Separately Hood for Down Flow LAGED C1HOOD20C 31 85 6 9 e 69 0 Horizontal Barometric Relief Dampers Hood Furnished LAGEDH18 24 16K99 9 9 9 9 0 NOTE catalog and model numbers that appear here are for ordering field installed accessories only amp Field Installed or Configure to Order factory installed O Configure to Order Factory Installed X Field Installed Page 12 OPTIONs ACCESSORIES Item Catalog 156 180 210 240 3005 No HUMIDITROLZ CONDENSER REHEAT OPTION Humiditrol Factory H H H H 5 Humidity Sensor Kit Remote Mounted required COSNSR31AE 1 17 50 x Remote Sensor Wall Seal Plate COMISC18AE 1 58L33 x OUTDOOR AIR Outdoor Air Dampers Damper Section down flow Order Hood Separately Motorized LAOADM18 24 16094
111. er the LGC units on a combustible surface for downflow discharge applications the Lennox LARMF 18 36 14 inch or 24 inch 356 mm or 610mm height roof mounting frame is used For horizontal discharge applications use LARMFH18 24 26 inch or 37 inch 660mm or 940mm height roof mounting frame This frame converts unit from down flow to horizontal air flow The 37 inch 940mm horizontal frame meets National Roofing Code requirements The roof mount ing frames are recommended in all other applications but not required If the LGC units are not mounted on a flat roof sur face they MUST be supported under all edges and under the middle of the unit to prevent sagging The units MUST be mounted level within 1 16 per linear foot or 5mm per meter in any direction The assembled LARMF 18 36 mounting frame is shown in fig ure 31 Refer to the roof mounting frame installation instruc tions for details of proper assembly and mounting The roof mounting frame MUST be squared to the roof and level before mounting Plenum system MUST be installed before the unit is set on the mounting frame Typical roof curbing and flashing is shown in figure 32 Refer to the roof mounting frame installa tion instructions for proper plenum construction and attach ment ASSEMBLED ROOF MOUNTING FRAME LGC156 300 CENTER SUPPORTS TWO PIECES EACH FIGURE 31 Page 63 TYPICAL FLASHING DETAIL UNIT BASE BOTTOM UNIT BASE RAIL FIBERGLASS INSUL
112. erant Charge Circuit 1 11 16 0 oz 4 99 kg 13 16 0 oz 5 9 kg F rnished R 22 Circuit 2 11 Ibs 0 oz 4 99 kg 13 Ibs 0 oz 5 9 kg Circuit 3 11 Ibs 0 oz 4 99 kg 13 Ibs 0 oz 5 9 kg Refrigerant Charge Circuit 1 13 Ibs 8 oz 6 12 kg 13 Ibs 0 oz 5 9 kg Punished bse BOA Circuit 2 13 Ibs 8 oz 6 12 kg 13 Ibs 0 oz 5 9 kg with Humiditrol Option Circuit 3 11 Ibs 0 oz 4 99 kg 13 16 0 oz 5 9 kg Gas Heating Heat Input Type Low Standard Medium Performance 1 Stage 2 Stage 2 Stage 234 000 68 6 360 000 105 5 288 000 84 4 Condenser Net face area sq ft m2 total 56 5 5 25 Coils Tube diameter in mm No of rows 3 8 9 5 Fins per inch m 20 787 Condenser Motor horsepower W 4 1 3 249 Fans Motor rpm 1075 Total Motor watts 1395 Diameter in mm No of blades 4 24 610 3 Total Air volume cfm L s 15 450 7290 Evaporator Net face area sq ft m2 total 22 3 2 07 Coils Tube diameter in mm No of rows 3 8 9 5 Fins per inch m 14 551 Condensate Drain number and size 1 1 in NPT coupling Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head 3 Indoor Nominal motor output 2 hp 1 5 kW Blower and 3 hp 2 2 kW Drive 5 hp 3 7 kW Selection Maximum usable motor r output 3 hp 1 7 kW Only 45 hp 2 6 75 hp Motor Drive kit number 2 kit HA 725 kit HA 535 725 rpm kit 1 685 8
113. ervice Valve optional LGC units may be equipped with service valves located in the discharge and liquid lines The service valves are manually operated valves used for service operation 7 Filter Drier all units LGC units have a filter drier located in the liquid line of each refrigerant circuit at the exit of each condenser coil The dri er removes contaminants and moisture from the system 8 Freezestats S49 and S50 all units 53 LGC156 300 and 595 LGC210 300 Each unit is equipped with a low temperature switch freezes tat located on the return bend of each evaporator coil S49 first circuit S50 second circuit S53 third circuit and 595 fourth circuit are located on the correspond ing evaporator coils Each freezestat is wired to the main control module A55 Each freezestat is a SPST N C auto reset switch which opens at 29 F 3 F 1 7 C 1 7 C on a temperature drop and closes at 58 F 4 F 14 4 C 2 2 C ona tempera ture rise To prevent coil icing freezestats open during compressor operation to temporarily disable the re spective compressor until the coil warms sufficiently to melt any accumulated frost If the freezestats are tripping frequently due to coil icing check the unit charge airflow and filters before allowing unit back in operation Make sure to eliminate conditions which might pro mote evaporator ice buildup 9 Condenser Fans B4 B5 B21 and B22 See SPECIFICATIONS tables
114. external duct static pressure 2 Integrated Part Load Value rated at 80 F 27 C outdoor air temperature 3 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 3 Recommended Gas Supply Pressure SPECIFICATIONS LGC156H Input Btuh kW First Stage Second Stage First Stage Second Stage CSA Thermal Efficiency Gas Supply Connections Natural LPG Propane Output Btuh kW Compressor Type no No and size in mm 169 000 49 5 169 000 49 5 260 000 76 2 208 000 60 9 80 0 1 7 in w g 1 7 kPa 11 in w g 2 7 kPa 6 24 x 24 x 2 610 x 610 x 51 General Nominal Tonnage 13 Ton Data Model No 156H2B R22 156H4B R410A Efficiency Type High Cooling Gross Cooling Capacity Btuh kW 160 000 46 8 159 000 46 6 Performance 1 Net Cooling Capacity Btuh kW 156 000 45 7 154 000 45 1 ARI Rated Air Flow cfm L s 5100 2405 5200 2455 Total Unit Power kW 12 8 12 8 1 EER Btuh Watt 12 2 12 0 2 Integrated Part Load Value Btuh Watt 13 6 13 3 Refrig
115. g psig psig 65 F 183 75 180 78 185 75 65 F 167 76 167 79 171 80 169 80 75 F 212 76 209 78 214 77 75 F 193 77 193 80 199 82 196 81 55 TABLE 16 LGC210H with Humiditrol Outdoor Coil En tering TABLE 17 LGC240S Outdoor Coil En tering TABLE 18 Outdoorl ClRCUIT1 GIRCUIT2 CIRCUIT 3 CIRCUIT 4 Coil EU Dis Dis SCH Dis Entering 10 10 Temp Gg a psig psig SC ee 75 F 213 76 210 77 220 77 216 7 85 __ 244 78 242 79 252 TO 247 79 oser 282 79 285 80 205 80 80 105 F 313 80 317 82 324 81 325 82 15 357 82 361 83 83 372 84 TABLE 19 LGC300S with SE Outdoor Coil En Dis ig Dis SE Dis Dis Suc tering 10 10 10 10 5 Air Temp PS g psig psig psig psig 289 322 367 LGC Units Charged With R 410A TABLE 20 LGC120S R410A CIRCUIT 1 CIRCUIT 2 Outdoor Entering charge Suction charge Suction Air Temp 10 psig 5 psig 10 psig 5 psig Ter t5 Im _85 30 134 375 186 ET ES 139 TABLE 21 LGC120S R410A Humiditrol CIRCUIT 1 CIRCUIT 2 Outdoor Wow Reuma SCH psig psig psig psig Perr ae 54 ser mo me
116. gt gt gt LLO gt gt 3 35 06 465 65 WINNI 26 33 PIIOJITO 8 212 MD DI E 1 S13 1 14 i n x3 o KOR 22 lt 6 lt 0 102 JOINS J102 E 7 3 28 29 lt 7 lt Zen lt lt 55 i 6 lt lt 4100 100 AY 6 gt 7 gt FIRE ALARM CONTACT SUPPLIED BY INSTALLER THERMOSTAT HOOKUP FO R SELECTABLE OPTION 3 5 04 DESCRIPTION COMPONENT DESCRIPTION COMPONENT ON MI 5 OR BETTER IMC BOARD 55 SENSOR ELECTRONIC PLUG SENSOR NTROL DETECTOR SMOKE 5 00 PLUG THERMOSTAT INPUT TO PROVIDE THREE COMPRESSOR STAGES MONITOR PHASE PROTECTION PLUG COOLING SENSOR INPUT REQUIRES 3 HEAT 3 COOL THERMOSTAT PANEL MAIN PLUG BLOWER 4 COOL CONTROL AND K27 RELAY PANEL ECONOMLEER PLUG SENSOR INPUT SENSOR C PLUG ECONOMIZER OUTPUT 527 AND 552 ARE OPTIONAL Po oy 02 1AQ DETECTOR SMOKE SUPPLY AIR ilo PLUG BLOWER PROVING REMOVE JUMPER WHEN OCCUPIED UNOCCUPIED JACK U
117. hp 1 7 kW 3 45 hp 2 6 kW 5 75 hp 4 3 kW Drive Selection Motor Drive kit 2 2 hp kit 1 680 925 rpm kit 1 680 925 rpm kit 3 895 1120 rpm kit 3 895 1120 rpm 3 hp 3 hp kit 1 680 925 rpm kit 1 680 925 rpm kit 2 680 925 rpm kit 2 680 925 rpm kit 3 895 1120 rpm kit 3 895 1120 rpm kit 4 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 5 1110 1395 rpm kit 6 1110 1395 rpm kit 46 1110 1395 rpm 5 hp 5 hp kit 4 895 1120 rpm kit 4 895 1120 rpm kit 6 1110 1395 rpm kit 6 1110 1395 rpm Wheel nominal diameter x width in mm 1 15 x 15 381 x 381 1 15 x 15 381 x 381 Filters Type of filter Disposable Number and size in mm 4 18 x 24 x 2 457 x 610 x 51 Electrical characteristics 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction 1 Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 wb entering evaporator air minimum external duct static pressure 2 Integrated Part Load Value rated at 80 F 27 C outdoor air temperature 3 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 Using total air volume and system static pressure requ
118. ilable Standard 2 Stage 7 in w g 1 7 kPa 11 in w g 2 7 kPa Scroll 4 56 5 5 25 3 8 9 5 2 20 787 4 24 610 3 15 450 7290 22 3 2 07 3 8 9 5 3 14 551 1 1 in NPT coupling 25 Ton 300S2B R22 300S4B Standard 302 000 88 4 294 000 86 1 2 286 000 83 7 274 000 30 1 28 8 9000 4250 295 95 9 7 9 7 11 Ibs 4 oz 5 10 kg 17 65 402 5 10 kg 11 158 4 oz 5 10 kg 11 16 4 oz 5 10 kg 11 158 4 oz 5 10 kg 11 16 4 oz 5 10 kg 11 Ibs 4 oz 5 10 kg 17 Ibs 4 oz 5 10 kg 12 165 4 oz 5 56 kg 11 Ibs 4 oz 5 10kg 12 Ibs 4 oz 5 56 kg 11 Ibs 402 5 10kg 11 Ibs 4 oz 5 10 kg 77 Ibs 4 oz 5 10kg 11 165 4 oz 5 10 kg 11 Ibs 4 oz 5 10kg 7 in wg 1 7 kPa 11 in w g 2 7 kPa 56 5 5 25 3 8 9 5 2 20 787 4 24 610 3 16 000 7550 22 3 2 07 3 8 9 5 4 14 551 1 1 in NPT coupling Balanced Port Thermostatic Expansion Valve removeable power head 5 hp 3 7 KW 7 5 hp 5 6 kW 10 hp 7 5 kit 2 685 P 865 rpm kit 3 850 1045 rpm kit 4 945 1185 rpm 7 5 hp kit 5 945 1185 rpm kit 6 1045 1285 rpm kit 7 850 1045 rpm 10 hp kit 46 1045 1285 rpm kit 8 1135 1365 rpm 2 15 15 in 381 x 381 mm kit 2 685 P865 rpm 3 850 1045 rpm kit 4 945 1185 rpm 7 5 hp kit 5 945 1185 rpm kit 6 1045 1285 rpm 7 850 1045 rpm 10 hp 6 1045 1285 rpm 8
119. irements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 2 SPECIFICATIONS LGC120 150 General Nominal Tonnage Model No Efficiency Type Gross Cooling Capacity Btuh kW 1 Net Cooling Capacity Btuh kW ARI Rated Air Flow cfm L s Data 3 Sound Rating Number dB Total Unit Power kW 1 EER Btuh Watt 2 Integrated Part Load Value Btuh Wait Circuit 1 Circuit 2 Refrigerant Charge Furnished R 22 R410A Refrigerant Charge Furnished R 22 Circuit 1 R410A w Humiditrol Option Circuit 2 Two Stage Heat Input Type Input Btuh kW First Stage Second Stage Output Btuh kW Second Stage CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural LPG Propane Perfor mance 10 Ton 12 5 ton 120S2B R 22 120S4B R410A 150S2B R22 150S4B R410A Standard Standard 726 000 36 6 127 000 37 2 120 000 35 2 122 000 35 7 3800 1795 3600 1700 88 88 14 5 14 4 9 5 9 7 9 2 10 2 145 000 42 5 150 000 43 9 138 000 40 4 140 000 41 0 4250 2005 10 5 11 3 10 Ibs 0 oz 4 53 kg 11 Ibs 12 oz 5 33 kg 10 Ibs 0 oz 4 53 kg
120. l Strip TB1 Terminal Strip TB34 Outdoor Fan Fuse Some Models F10 5 2 8 3 Fan Relay K68 Blower Contactor K3 Overload Relay S42 Compressor Contactors Some Motors K1 and K2 N Terminal Strip TB13 156 180 210 240 300 CONTROL BOX PARTS ARRANGEMENT LOW AMBIENT TRANSFORMER SWITCH RELAY K159 ECONOMIZER CONTROL SECOND GAS VALVE J VOLTAGES ONLY G TBOUORERN LGC180 156S ONLY MODULE A56 CONTROL MODULE CONTACTOR TRANSFORMER T3 RELAY K10 ECONOMIZER ONLY G1 A58 RA ONER TRANSFORMER G J VOLTAGES ONLY T18 COMPRESSOR 2 T1 LOW VOLTAGE CONPRESSORS 3 amp 4 POWER EXHAUST TERMINAL STRIPS OUTDOOR FAN COMBUSTION AIR OUTDOOR FAN OUTDOOR CONTROL MODULE DE C1 A57 RELAY 1K65 TB34 TRANSFORMER 1 MOTOR FUSE INDUCER K13 RELAY K149 FAN RELAY 859 TB35 TRANSFORMER 18 BLOCK F10 K150 ms A MAIN CONTROL OUTDOOR MODULE M1 A
121. l and combustion air blower is controlled by main control panel A55 Burners All units use inshot burners see figures 21 and 22 Burn ers are factory set and do not require adjustment A peep hole with cover is furnished in the heating access panel for flame viewing Always operate the unit with the access panel in place Burners can be removed individually for service Burner maintenance and service is detailed in the SERVICE CHECKS section of this manual TYPICAL GAS BURNER ASSEMBLY BURNER SUPPORT CAP BURNER SUPPORT ORIFICE SENSOR FIGURE 21 Orifice Each burner uses an orifice two types figure 22 which is precisely matched to the burner input Install only the orifices with the same threads The orifice is threaded into the burner manifold The burner is supported by the orifice and will easily slide off for service NOTE Do not use thread sealing compound on the ori fices Using thread sealing compound may plug the ori fices Each orifice and burner are sized specifically to the unit Refer to Lennox Repair Parts Listing for correct sizing in formation ORIFICE WITH STRAIGHT THREADS ORIFICE WITH PIPE THREADS Tighten to 14 5 ft lbs Tighten to 6 25 5 ft Ibs Do not over tighten Do not over tighten FIGURE 22 NOTE LGC156 300 ONLY In primary and secondary high temperature limits S10 S99 S21 and S100 the igni tion circuits in b
122. lows see IMC manual ECTO 4 24 option 3 1 Blower must be operating 2 System must be in occupied mode 3 System must NOT be operating in heating mode 4 One cooling demand is required if the unit has been in heating mode the IMC has been reset or at initial unit start up ECTO 4 24 option 5 3 System must NOT be operating in heating mode 4 One cooling demand is required if the unit has been in heating mode the IMC has been reset or at initial unit start up 4 24 option 7 3 System must NOT be operating in heating mode Once the corresponding conditions are met in each mode reheat will operate as shown in table 33 TABLE 33 Reheat Operation Two Cooling Stages Default T stat and Hu Demands Operation Compressor 1 Reheat amp Compressor 1 Cooling amp 2 Cooling If there is no reheat demand and outdoor air is suitable free cooling will operate If there is no reheat demand and outdoor air is suitable free cooling and compressor 1 will operate Additional Cooling Stages Units are shipped from the factory to provide two stages of cooling ECTO 5 04 option 2 and 6 01 option 0 Three stages of cooling is available in zone sensor mode ECTO 6 01 set to option 1 2 or 3 Three stages of cooling is also available by installing a transfer relay and a three stage thermostat ECTO 5 04 must be set to option 3 Humiditrol units provide a dehumidifying mode of opera tion The
123. ment At the same time the N O contacts of 10 and S99 close energizing the blower relay coil K3 through control 5 either limit trips the blower will be energized Limts settings are factory set and cannot be adjusted If limit must be replaced same type and set point must be used See Lennox Repair Parts Handbook Page 51 5 Secondary High Temperature Limits 21 all LGC102 150 units amp LGC156 300 1 units amp 100 LGC156 300 1 units 21 is the secondary high temperature limit for heat sec tion one while S100 is the secondary high temperature limit for heat section two Like the primary limits the sec ondary limits are located in the blower compartment 21 and S100 are mounted on top of the blowers see figure 17 Secondary limit S21 is also wired to the main control panel A55 while secondary limit S100 is wired to the gas 2 panel 58 The secondary limits function in the same manner as the primary limits but are factory set to actu ate at different temperatures The N O contacts of both 21 and 5100 are connected to the blower relay coil K3 through control A55 If either limit trips the blower will be energized All limits used are SPDT N C auto reset lim its Limts settings are factory set and cannot be adjusted If limit must be replaced same type and set point must be used See Lennox Repair Parts Handbook 6 Flame Rollout Limits 547 all units amp S69 LGC156 300 Flame rollout limits S47 on LGC1
124. motor heat deduction Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum external duct static pressure Integrated Part Load Value tested at 80 F 27 C outdoor air temperature Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Kit 2 is used with high efficiency 3 HP motor only A Page 5 SPECIFICATIONS LGC180S General Nominal Tonnage Data Model No Efficiency Type Gross Cooling Capacity Btuh kW 1 Net Cooling Capacity Btuh kW ARI Rated Air Flow cfm L s Total Unit Power kW 1 EER Btuh Watt 2 Integrated Part Load Value Btuh Watt Refrigerant Charge Circuit 1 Furnished R 22 Circuit 2 Circuit 3 Circuit 4 Heat Input Type Cooling Performance Gas Heating Performance Input Btuh KW First Stage Second Stage First Stage Second Stage CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural LPG Propane Output Btuh kW Compressor Type no Condenser Net f
125. n At altitudes above 2000 feet 610 m units must be derated to match gas manifold pressures shown in table below NOTE This is the only permissible derate for these units Natural Gas Altitude ft m in w g kPa 2001 3000 610 915 3 6 0 90 10 2 2 54 LPG Propane in w g kPa 3001 4000 915 1220 3 5 0 87 9 9 2 46 4001 5000 1220 1525 3 4 0 85 9 6 2 39 5001 6000 1525 1830 3 3 0 82 9 4 2 34 6001 7000 1830 2135 3 2 0 80 9 1 2 26 B Cooling System Service Checks LGC units are factory charged and require no further adjust ment however charge should be checked periodically using the approach method The approach method compares actual liquid temperature with the outdoor ambient temperature See section Ill CHARGING NOTE When unit is properly charged discharge line pres sures should approximate those in tables 4 through 27 VI MAINTENANCE Electric shock hazard Can cause injury or death Before attempting to perform any service or maintenance turn the electrical power to unit OFF at disconnect switch es Unit may have multiple power supplies A Filters LGC units use pleated throw away type filters See table below for number used and size Filters may be accessed through the economizer filter access door Filters should be checked monthly or more frequently in se vere use and cleaned or replaced regularly Take note of the AIR FLOW DIRECTION marking on the fil
126. ng Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head 4 Indoor Nominal motor output 2 hp 1 5 kW 3 hp 2 2 kW 5 hp 3 7 kW Blower Maximum usable motor output 2 3 hp 1 7 kW 3 45 hp 2 6 kW 5 75 hp 4 3 kW and Drive Motor Drive Kit Z hp 2 hp Selection kit 1 680 925 rpm kit 1 680 925 rpm Wheel nominal diameter x width in mm Type of filter Number and size in mm Electrical characteristics Filters kit 3 895 1120 rpm kit 3 895 1120 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 3 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm 6 1110 1395 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 3 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 6 1110 1395 rpm 5h kit 4 895 1120 rpm kit 6 1110 1395 rpm 1 15 15 381 x 381 kit 4 898 1120 rpm kit 6 1110 1395 1 15 x 15 381 x 381 Disposable 4 18 x 24 x 2 457 x 610 x 51 4 18 x 24 x 2 457 x 610 x 51 208 230V 460V 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction 1 Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum
127. nstalled in LGC units Washable filter supplied with the outdoor air dampers can be cleaned with water and a mild detergent It should be sprayed with Filter Handicoat er when dry prior to reinstallation Filter Handicoater is R P Products coating no 418 and is available as Lennox Part No P 8 5069 LAOAD18 24 MANUAL OUTDOOR AIR DAMPER FILTER BRACKET SIDE VIEW HOOD SEAL 5 HOOD FILTER FIGURE 33 D Supply and Return Diffusers all units Optional flush mount diffuser retum and extended mount diffuser return RTD11 are available for use with all LGC units Refer to manufacturers instructions included with transition for detailed installation procedures Page 64 E LAREMD Economizer all units Field or Factory Installed The optional LAREMD18 24 economizer used on LGC156H 300S units and LAREMD10 15 used on 1 5 0905 1505 units be used with downflow and hori zontal air discharge applications LAREMD18 24 econo mizer uses outdoor air for free cooling when temperature and or humidity is suitable An economizer hood is required and must be ordered separately NOTE Gravity exhaust dampers are required with power exhaust The economizer is controlled by the economizer control module A56 which connects to the main control module A55 Both boards are part of the Integrated Modular Control IMC which controls L series unit operation The economizer will
128. ntegrated Part Load Value Btuh Watt Refrigerant Gharge Circuit 1 Furnished R22 R410A Circuit 2 Circuit 3 Circuit 4 Refrigerant Gharge Circuit 1 Furnished R22 R410A Circuit 2 with Humiditrol Option eege Circuit 3 Circuit 4 Gas Heating Heat Input Type Performance Input Btuh kW First Stage Second Stage First Stage Second Stage CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural Output Btuh kW LPG Propane Compressor Type no Condenser Net face area sq ft m total Coils Tube diameter in mm No of rows Fins per inch m Condenser Motor horsepower W Fans Motor rpm Total Motor watts Diameter in mm No of blades Total Air volume cfm L s 15 Ton 180H2B R22 180H4B R410A 180H4B 3 Units High 188 000 55 1 190 000 55 7 186 000 54 4 182 000 53 3 184 000 53 9 182 000 53 3 5700 2690 15 4 16 1 15 4 11 8 11 4 11 8 13 3 12 8 13 3 11 Ibs 8 oz 5 22 kg 12 Ibs 0 oz 5 67 kg 11 Ibs 8 oz 5 22 kg 11 Ibs 8 oz 5 22 kg 12 Ibs 0 oz 5 67 kg 11 Ibs 8 oz 5 22 kg 11 Ibs 8 oz 5 22 kg 12 Ibs 0 oz 5 67 kg 11 8 oz 5 22 kg 14 16 0 oz 6 35 kg 12 Ibs 0 oz 5 67 kg 11 Ibs 8 oz 5 22 kg 14 Ibs 0 oz 6 35 kg 12 Ibs 0 z 5 67 kg 11 Ibs 8 oz 5 22 kg 11 Ibs 8 oz 5 22 kg 12 Ibs 0 oz 5 67 kg 11 Ibs 8 oz 5 22 kg Low Standard Medium High 1 Stage 2 Stage 2 Stage 2 Stage 169 000 49 5 1
129. odule A55 receives a demand from thermostat terminal G A55 energizes blower contactor K3 with 24VAC 4 N O K3 1 closes energizing blower B3 Economizer Operation 5 The economizer control module A56 receives a demand and energizes exhaust fan relay K65 with 24VAC at 50 travel outside air damper open adjustable 6 N O K65 1 and K65 2 both close energizing exhaust fan motors B10 and B11 1st Stage Cooling both compressors B1 and B2 are energized 7 First stage cooling demand energizes Y1 and G in the thermostat G energizes blower if blower is not already running see step 3 8 24VAC is routed through TB34 to the main control module 55 After A55 proves low pressure switch S87 N C freezestat S49 and N C high pressure switch S4 com pressor contactor K1 is energized 9 N O contacts K1 1 close energizing compressor B1 10 low ambient switch S11 and S84 close to energize condenser fan contactor K10 NOTE In the LGC156 and 180 units K10 is energized after K159 1 closes K159 is energized by TB35 after one of the N O low ambient pressure switches S11 S84 and S85 closes 11 contacts K10 1 close energizing condenser fan B4 and N C contacts K10 2 open de energizing compressor 1 crankcase heater HR1 12 Simultaneous with step 8 24VAC is routed through the compressor 2 control module 57 After 57 proves N C low pressure switch S88 N C freezestat S50 and N C high pressu
130. ol demand Page 36 9 Blower Contactor all units Blower contactor K3 used in all units is a three pole double break contactor with a 24VAC coil used to energize the indoor blower motor B3 in response to blower demand K3 is ener gized by main control panel A55 10 Outdoor Fan Relay K10 K68 all units K149 amp K150 LGC156 300 Outdoor fan relays K10 K68 K149 and K150 are DPDT re lays with a 24VAC coil In all LGC units K10 and K68 ener gizes condenser fans B4 and B5 In addition to K10 and K68 the LGC156 300 is equipped with K149 and K150 which en ergizes condenser fans B21 and B22 11 Combustion Air Inducer Relay K13 Combustion air inducer relay K13 used in all LGC units is a DPDT relay with a 24VAC coil K13 is energized by the main control module 55 after a first stage heating demand from the thermostat K13 remains energized throughout the heat ing demand When energized K13 N O contacts close to energize combustion air blower and begin a heating se quence Pressure switch 518 located in the compressor compartment closes as combustion air static pressure falls to prove combustion air inducer operation When 18 closes the ignition controls and gas valves are ener gized to begin a heating sequence 12 Combustion Air Inducer Relay K19 LGC156 300 second burner section Combustion air inducer relay K19 used in all LGC156 300 units is a DPDT relay with a 24 VAC coil K19 is energized b
131. ols the econo mizer A56 has four different cooling modes sensible temperature outdoor enthalpy differential enthalpy and global control SENSORS INPUTS IMC BOARD INPUTS AND OUTPUTS LGC102S 150S 3 OUTPUTS COMPRESSOR SAFETY INPUTS BURNER INPUTS TB1 connects to P110 Room thermostat connects to TB1 IMC AND ADD ON BOARD LOCATION AND OPERATION 1 Blower 1 Compressor 1 Gas valve 1 Outdoor fan 4 fe EJ a A56 Optional Economizer and or Power Exhaust Fan lia compressor 1 Outdoor fan 57 A67 Second Optional Reheat Control EE Mener i all FIGURE 8 Page 39 IMC BOARD INPUTS AND OUTPUTS LGC156H 300S SENSORS INPUTS P110 P111 P112 OUTPUTS COMPRESSOR SAFETY INPUTS BURNER THERMOSTAT INPUTS A2 TB1 connects to P110 Room thermostat connects to TB1 See section C2 in the wiring diagram section P 65 IMC AND ADD ON BOARD LOCATION AND OPERATION 1 Blower 1 Compressor A55 1 Gas valve 1 Outdoor fan A59 Compressors 3 andl 4 2 Outdoor Fans Optional Ce TN 1 Reversing valve 467 RH1 Reheat Control 1 Electric heat section eech A58 m 58 1 Second Gas 57 Valve Second Economizer compressor and or Power 1 Outdoor fan or Exhaust Fan AGO Second Electric Heat Section ee EE hus e e ol FIGURE 9 Page 40 90 102 120 150 PLUMBING COMPR
132. or correct amount of charge NOTE Refer to III CHARGING for proper method to check refrigerant charge REFRIGERANT CIRCUITS 090 150 BOTH FANS ARE ENERGIZED WITH A Y1 DEMAND CONDENSER CONDENSER FAN 1 FAN 2 REFRIGERANT CIRCUITS 156 180 STAGE 1 CONDENSER COIL STAGE 2 STAGE 1 EVAPORATOR EVAPORATOR STAGE 2 CONDENSER COIL REFRIGERANT CIRCUITS 210 240 300S STAGE 1 STAGE2 EVAPORATOR CO EVAPORATOR COIL bes 2 CONDENSER COIL FIGURE 26 Page 58 C Heating Startup FOR YOUR SAFETY READ BEFORE LIGHTING Danger of explosion Can cause injury product or property damage over heating occurs or if gas supply fails to shut off shut off the manual gas valve to the appliance before shutting off electri supply Electric shock hazard Can cause injury or death Before attempting to perform any service or maintenance v turn the electrical power to unit OFF at disconnect switch es Unit may have multiple power supplies BEFORE LIGHTING smell all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor Use only your hand to push in or turn the gas control knob Never use tools If the knob will not push in or turn by hand do not try to repair it call a qualified service technician Force or attempted repair may result in a fire or explosion A IMPORTANT This unit is equipped with an
133. ory installed gas valves for single stage heat only are available for the LGC156 180 and 210 Gas valves are wired without W2 eliminating two stage heat WHITE RODGERS 36C76 GAS VALVE STAGE 2 MANUAL MANIFOLD INLET PRESSURE ADJUSTMENT PRESSURE TAP SIDE MANIFOLD PRESSURE SCREW UNDER CAP TAP SIDE GAS VALVE 2 SHOWN IN OFF HONEYWELL VR8305 VR8205 GAS VALVE GAS VALVE SHOWN HIGH FIRE IN OFF POSITION LOW FIRE ADJUSTMENT ADJUSTMENT MANIFOLD PRESSURE PRESSURE FIGURE 23 TABLE 3 GAS VALVE REGULATION FOR LGA UNITS Operating Pressure Maximum outlet Factory Setting Inlet Pressure Natural Ps L P Low High Low High 13 0 W C 1 6 0 2 W C 3 7 0 3 W C 5 5 0 3 W C 10 5 0 5 W C 3232Pa 398 50Pa 920 75Pa 1368 75 2611 7124 11 Spark Electrodes An electrode assembly is used for ignition spark Two identical electrodes are used one for each gas heat section The electrode is mounted through holes on the left most end of the burner support The electrode tip protrudes into the envelope of the adjacent burner The electrode assembly is fastened to bumer supports and can be removed for service without removing any part of the burners During ignition spark travels through the spark electrode fig ure 24 and ignites the left burner Flame travels from burner to burner until all are lit The spark electrode is conne
134. oth gas heat sections one and two are im mediately de energized when terminals 1 3 open and the indoor blower motor is immediately energized when terminals 1 2 close This is the primary and secondary safety shut down function of the unit 4 Primary High Temperature Limits 10 all units amp S99 LGC156 300 10 is the primary high temperature limit for gas heat in LGC090 150 units and for section one LGC156 300 units while 599 is the primary high temperature limit for gas heat section two for LGC156 300 On LGC090 150 510 is located on the blower deck behind the blower On LGC156 300 1 units 510 is located in the blower compartment and is mounted on the end of the blower support panel which divides the blower compartment from the heating compartment see figure 17 599 is located on the blower support panel which separates the second gas heat section from the outdoor condenser section see figure 17 599 is accessed through patch plate on the condenser divider panel In LGC156 300 2 units 510 and 599 are located on the shield behind the blower housing In this location 510 and 599 also serve as secondary limits Primary limit 510 is wired to the main control panel A55 which energizes burner 1 control while primary limit 599 is wired to the gas 2 panel A58 which energizes burner 2 control A12 Its N C contacts open to de energize the ignition control when excessive temperature is reached in the blower compart
135. panel A55 force air across all surfaces of the tubes to extract the heat of combustion The shape of the tubes ensures maximum heat exchange The gas valves accomplish staging by allowing more or less gas to the burners as called for by heating demand NORMAL IGNITION SEQUENCE TIMINGS NOMINAL 70 05 END B DEMAND THERMOSTAT DEMAND COMBUSTION AIR BLOWER COMBUSTION AIR PROVE SWITCH GAS VALVE IGNITION SPARK BLOWER IGNITION TRIAL FIGURE 18 ON or SECONDS05 30 35 THERMOSTAT DEMAND Cg LLL COMBUSTION AIR PROVE SWITCH GAS VALVE RETRIALS IGNITION ATTEMPT SEQUENCE TIMINGS NOMINAL 65 70 m 105 IGNITION SPARK A BLOWER IGNITION TRIAL A A ey WATCHGUARD LOCKOUT FIGURE 19 IGNITION CONTROL TIMING 6 ON THERMOSTAT DEMAND SECONDSO 30 3 4 2 0 5 C9 SC I ND OF THERMOSTAT DEMAND YCLE COMBUSTION AIR BLOWER GAS VALVE IGNITION SPARK E 4 BLOWER IGNITION TRIAL HEATING ES E gt 42 SEC 122 SEC FIGURE 20 Page 50 3 Assembly Figure 21 The burners are controlled by the spark electrode flame sens ing electrode gas valve and combustion air blower The spark electrode flame sensing electrode and gas valve are directly controlled by ignition control Ignition contro
136. rb MERV 11 kill MERV 15 4800 0 03 0 05 0 02 5500 0 04 0 07 0 02 6500 0 05 0 09 0 02 0 03 7000 0 06 0 10 0 04 0 03 Page 26 BLOWER DATA 17 5 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT WITH STANDARD GAS HEAT WET INDOOR COIL amp AIR FIL TERS IN PLACE FOR ALL UNITS ADD 1 Any factory installed options air resistance high gas heat economizer etc See table below 2 Any field installed accessories air resistance duct resistance diffuser etc See page Page 30 Then determine from table the blower motor output and drive required 0 20 to 1 20 in w g LGC210 Air External Static in w g Volume cfm 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 1 00 1 10 1 20 RPM RPM RPM RPM BHP 1 30 to 2 40 w g LGC210 Air External Static in w g Volume cfm 1 30 1 40 1 50 1 60 1 70 1 80 1 90 2 00 2 10 2 20 2 30 2 40 RPM RPM RPM BHP BHP RPM RPM RPM BHP RPM BHP Standard Static 5 HP High Static 7 5 HP 9 6000 998 4 13 1025 4 35 1050 4 58 1075 4 80 1098 5 00 1120 5 20 1145 5 43 11170 5 65 1193 5 88 11215 6 10 1235 6 33 11255 6 55 6500 1013 4 63 1040 4 85 1065 5 10 1090 5 35 1115 5 60 1140 5 85 1163 6 08 1185 6 30 1205 6 53 1225 6 75 11248 7 00 11270 7 25 1 1 1 1
137. re allowing the gas valve to open The combustion air prove switch is factory set and not adjustable The switch will automatically open on a pressure rise less negative pressure Table 2 shows prove switch settings for unit production dates before and after February 2009 TABLE 2 18 amp S45 Prove Switch Settings Unit Production Close Open Date Pa Pa 0 2545 0 1045 Feb 2009 amp Later 62 3 12 4 24 8 12 4 0 46 5 0 3145 Prior to Feb 2009 114 12 4 77 2 12 4 8 Combustion Inducers B6 all units amp B15 LGC156 300 Combustion air blowers B6 on LGC090 150 and LGC156 300 first heat section and B15 LGC156 300 second heat section are identical blowers which provide fresh air to the corre sponding burners while clearing the combustion chamber of exhaust gases The blowers begin operating immediately upon receiving a thermostat demand and are de energized immediately when thermostat demand is satisfied Both combustion air blowers use a 208 230V single phase PSC motor and a 4 81in x 1 25in 122mm x 32mm blower wheel All motors operate at 3200RPM and are equipped with auto reset overload protection Blowers are supplied by vari ous manufacturers Ratings may vary by manufacturer Spe cific blower electrical ratings can be found on the unit rating plate All combustion air blower motors are sealed and cannot be oiled The blower cannot be adjusted but can be dis assembled for cleaning 9
138. re switch S7 compressor contactor K2 is energized 13 N O contacts K2 1 close energizing compressor B2 14 Compressor 2 control module 57 energizes condenser fan 2 relay K68 15 N O contacts K68 1 close energizing condenser fan B5 and N C contacts K68 2 open de energizing compressor 2 crankcase heater HR2 2nd Stage Cooling B13 15 ton 52 8 kW and both B13 and B20 in 17 5 and 20 ton 61 5 and 70 3 kW are energized 16 Second stage cooling demand energizes Y2 17 24VAC is routed through TB35 to compressor 3 and 4 module 59 After 59 proves N C low pressure switches S98 and S97 N C freezestats 553 and S95 and N C high pressure switches S28 and S96 com pressor contactors K14 and K146 are energized NOTE LGC156 and 180 units will be equipped with S98 S53 S28 and K14 only 18 N O contacts K14 1 close energizing compressor B13 19 N O contacts K146 1 close energizing compressor B20 LGC210 300 only 20 N O low ambient pressure switches S85 and S94 close to energize condenser fan relay K149 NOTE In the LGC156 and 180 units K149 is energized after K159 2 closes K159 is energized by TB35 after one of the N O low ambient pressure switches S11 S84 and S85 closes 21 contacts K149 1 close energizing condenser fan B21 and N C contacts K149 2 open de energizing compressor 3 crankcase heater HR5 22 Compressor 3 and 4 module A59 energizes condenser fan relay K150 23 contacts K150
139. s Indoor Blower Horsepower 3 5 Motor Rated Load Amps 7 5 10 6 16 7 34 4 8 7 6 21 3 9 6 1 Locked Rotor Amps 46 9 20 4 26 8 45 6 16 2 23 4 36 6 Maximum Unit only 30 35 Overcurrent Protection with power exhaust 5 Minimum Circuit Unit only 1 Ampacity with power exhaust 3 Disconnect 84M13 84MM 4 84M13 NOTE Extremes of operating range are plus and minus 10 EE line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements 16 ELECTRICAL DATA LGC180 ELECTRICAL DATA 15 TON 15 TON STANDARD EFFICIENCY R 22 16 18052 Voltage 6012 3 phase 20823 46V 575 Compressors Rated Load Amps total 15 4 s 74 5 9 17 7 3 Locked Rotor Amps total 59 6 178 8 49 4 148 2 Outdoor Fan Full Load Amps total 24 9 S 1 3 52 1 4 Motors 4 Locked Rotor Amps total 4 7 18 8 1 9 7 6 Standard Power Horsepower 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 24 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 4 8 1 9 3 8 Service Outlet 15V GFI Se Indoor Blower Horsepower 5 7 5 7 5 Motor Rated Load Amps B 9 1 9 Locked Rotor Amps d E 4 2 6 54 Maximum Unit only 80 90 110 20 20 20 Eege edit with power exhaust 90 90 110 40 Minimum Unit only 71 77 84 35 37 41 28 30 33 Amp
140. s RH1 is located on the M1 board underneath either the A58 G1 or A60 E1 board Reheat Setpoint Reheat is factory set to energize when indoor relative humid ity rises above 60 default Reheat will terminate when the indoor relative humidity falls 3 below setpoint or 57 de fault The reheat setpoint can be adjusted by changing ECTO 4 25 setting of 100 will disable reheat The reheat setpoint can also be adjusted using an optional Network Con trol Panel NCP A91 Humidity Sensor Relative humidity should correspond to the sensor A91 output voltage listed in table 34 For example if indoor air relative humidity is 80 3 the humidity sensor output should read 8 00VDC Check the sensor output annually for accuracy Keep the air intake openings on the sensor clean and free of obstruc tions and debris Read Relative Humidity At IMC Turn MODE DIP TEMP switch 4 ON Display will alter nately flash from readout to output A single push on the pushbutton will toggle the readout upward from 0 to 7 in crementally A double push will toggle the readout down ward from 7 to 0 incrementally Readout 7 indicates per cent relative humidity TABLE 34 Sensor Output VDC Relative Humidity RH 3 20 30 40 50 60 70 80 90 A67 RH1 BOARD LOCATION ON A55 M1 BOARD 58 G1 OR A60 E1 BOARD ON TOP OF A67 RH1 BOARD 55 M1 A67 RH1 A56 asr EI
141. se a single line voltage to 24VAC transformer mounted in the control box Transformer supplies power to control circuits in the unit The transformer is rated at and is protected by a 3 5 amp circuit breaker CB8 The 208 230 Y voltage transformers use two primary voltage taps as shown in figure 5 while 460 G and 575 J voltage transform ers use a single prima ry voltage tap 208 230V TRANSFORMER BLUE YELLOW SECONDARY 208 VOLTS ORANGE PRIMARY FIGURE 5 BLACK 3 Contactor Transformer T18 LGC156 300 units T18 is asingle line voltage to 24VAC transformer used in all LGC 13 to 25 ton units Transformer T18 is protected by a3 5 amp circuit breaker CB18 T18 is identical to trans former T1 The transformer supplies 24VAC power to the contactors 4 I Transformers all 460 amp 575V units amp 13 460 amp 575V 156 300 units only All LGC 460 G and 575 J voltage units use transformer T3 In addition LGC156 300 units use transformer T13 The auto voltage to 230VAC transformers are mounted in the control box The transformers have an output rating of 0 5A T3 trans former supplies 230 VAC power to combustion air blower mo tor B6 while T13 transformer supplies power to combustion air blower motor B15 in LGC156 300 units 5 Terminal Strips TB1 TB13 TB34 all units and TB35 LGC156 300 TB1 terminal strip distributes 24V power and common from the thermostat to the control
142. se units contain a reheat coil adjacent to and downstream of the evaporator coil Reheat coil solenoid valve L14 routes hot discharge gas from the compressor to the reheat coil Return air pulled across the evaporator coil is cooled and dehumidified the reheat coil adds heat to supply air See figure 36 for reheat refrigerant routing and figure 37 for standard cooling refrigerant routing Page 70 P Factory Installed Humiditrol LGC156H 180H 210H amp 300S General Humiditrol units provide a dehumidifying mode of opera tion These units contain a reheat coil adjacent to and downstream of the evaporator coil Reheat coil solenoid valves L14 and L30 route hot discharge gas from the compressor to the reheat coil Return air pulled across the evaporator coil is cooled and dehumidified the reheat coil adds heat to supply air See figure 39 for RH1 reheat control board figure 40 for 156H and 180H reheat refrigerant routing figure 41 for 156H and 180H standard cooling refrigerant routing figure 42 for 210H and 300 reheat refrigerant routing and figure 43 for 210H and 3005 standard cooling refrigerant routing L14 and L30 Reheat Coil Solenoid Valves When IMC board input P114 10 indicates room condi tions require dehumidification L14 and L30 reheat valves are energized RH1 board P175 3 and 4 and refrigerant is routed to the reheat coil RH1 Humiditrol Board A67 The RH1 add on board is factory installed in all Humiditrol unit
143. so be adjusted using an optional Network Control Panel NCP Reheat will terminate when the indoor relative humidity falls 396 5796 default or the digital output de energizes The re heat deadband can be adjusted 1 10 RH by changing ECTO 4 26 A91 Humidity Sensor Install humidity sensor in the conditioned space according to instructions provided with sensor Relative humidity should correspond to the sensor A91 output voltage listed in table 34 For example if indoor air relative humidity is 80 3 the humidity sensor output should read 8 00VDC Check the sensor output annually for accuracy Keep the air intake openings on the sensor clean and free of obstruc tions and debris Read Relative Humidity At IMC Turn MODE DIP TEMP Display will alternately flash from readout to output A single push on the pushbutton will toggle advance to different sensor readings A double push will toggle the readout the opposite direction Once readout rH is displayed alternately with the output use table 32 to determine the percent relative humidity Check Out Test Humiditrol operation using the following procedure 1 Make sure reheat is wired as shown in wiring section 2 Set IMC ECTO system mode parameter 6 01 to option 0 default local thermostat mode 3 For RH sensors set IMC ECTO reheat setpoint param eter 4 25 to 096 relative humidity For digital input set ECTO reheat setpoint parameter 4 25 to 1
144. t for maximum air and cannot be justed Always operate unit with access panel in place A peep hole is furnished in the heating access panel for flame viewing Natural gas should burn basically blue with some clear streaks L P gas should burn mostly blue with some clear yel low streaks Figure 29 shows how to remove burner assembly 1 Tum off power to unit and shut off gas supply 2 Remove screws holding the burner support cap 3 4 Clean and reassemble reverse steps 1 3 Slide each burner off its orifice 5 Be sure to secure all wires and check plumbing 6 Turn on power to unit Follow lighting instructions at tached to unit and operate unit in heating mode Check burner flames They should be blue with yellow streaks 7 Spark Electrode Gap The spark electrode assembly can be removed for inspection by removing two screws securing the electrode assembly and sliding it out of unit For proper unit operation electrodes must be positioned and gapped correctly Spark gap may be checked with appropriately sized twist drills or feeler gauges Disconnect power to the unit and remove electrode assembly The gap should be between 0 125 0 015 3 2 mm 4 mm See figure 24 TYPICAL GAS BURNER ASSEMBLY BURNER SUPPORT CAP BURNER SUPPORT ORIFICE SENSOR FIGURE 29 8 Heat Exchanger To Access or Remove Heat Exchanger From Unit 1 off gas and electric power 2 Remove access panel s and unit
145. t in erratic operation or underfire High pressure can result in permanent damage to the gas valve or over fire For natural gas units operating pressure at the unit gas connection must be between 4 7 W C and 10 5 W C 1168 Pa and 2610 Pa For L P gas units op erating pressure at the unit gas connection must be be tween 10 8 W C and 13 5 W C 2685 3 Pa and 3356 7 Pa On multiple unit installations each unit should be checked separately while operating at maximum rate beginning with the one closest to the supply gas main and progressing to the one furthest from the main Multiple units should also be tested with and withoutthe otherunits operating Supply pressure must fall within the range listed in the previous paragraph 4 Check and Adjust Manifold Pressure After line pressure has been checked and adjusted check manifold pressure Move test gauge to the outlet pressure tap located on unit gas valve GV1 and or GV3 See figure 27 for location of pressure tap on the gas valve The manifold pressure is factory set and should not re quire adjustment If manifold pressure is incorrect and no other source of improper manifold pressure can be found the valve must be replaced See figure 27 for location of gas valve man ifold pressure adjustment screw All gas valves are factory regulated The gas valve should completely and immediately cycle off in the event of gas or power failure The manual shut off knob can be use
146. t switch S69 and the closed con tacts of the combustion air proving switch S45 to energize the ignition module A12 After a 30 second delay A12 energizes gas valve GV3 on low fire Page 85 SECOND STAGE HEAT 8 10 With first stage heat operating an additional heating demand initiates W2 in the thermostat A second stage heating demand is received by both 55 and A58 modules Each module will energize the correspondinggas valves GV1 and GV3 on high fire OPTIONAL LOW AMBIENT KIT C GA 50 C LOW AMBIENT KIT 11 Line voltage or transformer T20 in 460V and 575V only is routed through the low ambient kit fuses F20 and N C low ambient kit thermostats S60 and S61 to energize low ambient kit heater HR6 END OF SECOND STAGE HEAT 12 13 Heating demand is satisfied Terminal W2 is de energized High fire on GV1 and GV3 are de energized by the A55 and A58 Module END OF FIRST STAGE HEAT 14 15 Heating demand is satisfied Terminal W1 is de energized Ignition module A3 is de energized by A55 in turn de energizing GV1 Combustion blower relay K13 is also de energized At the same instant ignition module 12 is de energized by A58 module in turn de energizing GV3 K19 combustion air blower relay is also de energized 24V POWER ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT 24V COMMON A 39 46 464 P64 gt gt 410171
147. tactor coil 54 first circuit 57 Second circuit S28 third circuit and S96 fourth circuit are wired in series with the respective compres sor contactor coils Units charged with R22 When discharge pressure rises to 450 10 psig 3103 69 kPa indicating a problem in the system the switch opens and the respective compressor is de energized the economizer can continue to operate When dis charge pressure drops to 300 20 psig 2068 138 kPa the pressure switch will close Units charged with R410A When discharge pressure rises to 650 10 psig 4413 69 kPa indicating a problem in the system the switch opens and the respective compressor is de energized the economizer can continue to operate When dis charge pressure drops to 475 20 psig 3275 138 kPa the pressure switch will close Main control A55 has a three strike counter before lock ing out This means the control allows three high pres sure trips per one thermostat demand The control can be reset by breaking and remaking the thermostat de mand or manually resetting the control 4 Low Ambient Switches 511 amp S84 all units 585 156H 300S S94 210 300S The low ambient switch is an auto reset SPST N O pres sure switch which allows for mechanical cooling opera tion at low outdoor temperatures All units are equipped with this switch In all models a switch is located in each liquid line prior to the indoor coil section In LGC090 150 S1
148. tatic 5 HP Field Furnished AIR RESISTANCE in w g Factory Installed Options Air Volume cfm Gas Heat ges Horizontal Filters Med Heat High Heat Roof Curb MERV 11 MERV 15 4160 0 02 4400 0 02 4800 0 02 5000 0 02 5600 0 02 6000 0 03 6240 0 03 Page 25 BLOWER DATA 15 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT WITH STANDARD GAS HEAT WET INDOOR COIL amp AIR FIL TERS IN PLACE FOR ALL UNITS ADD 1 Any factory installed options air resistance high gas heat economizer See table below 2 Any field installed accessories air resistance duct resistance diffuser etc See page Page 30 Then determine from table the blower motor output and drive required 0 30 to 1 40 in w g LGC180 Air External Static in w g volum 5 0 30 0 40 0 50 0 60 0 70 0 80 0 90 1 00 1 10 1 20 1 30 1 40 RPM RPM RPM RPM BHP RPM BHP RPM RPM BHP 1 50 to 2 50 in w g LGC180 Air External Static in w g Volume cfm 1 50 1 60 1 70 1 80 1 90 2 00 2 10 2 20 2 30 2 40 2 50 RPM RPM RPM RPM High Static 5 HP High Static 7 5 HP NOTE italics field furnished AIR RESISTANCE in w g Factory Installed Options ee eem Economizer Roof Cu
149. ter frame when re installing TABLE 31 LGC FILTERS UNIT SIZE IN MM KH 18x 24 x 2 457 x610 x 51 156 300 24 x 24 x 2 610 x 610 x 51 6 NOTE Filters must be U L C certified or equivalent for use in Canada B Lubrication All motors and blower wheels used in LGC units are pre lubricated no further lubrication is required C Supply Air Blower Wheel Annually inspect supply air blower wheel for accumulated dirt or dust Turn off power before attempting to remove access panel or to clean blower wheel D Evaporator Coil Inspect and clean coil at beginning of each season Clean using mild detergent or commercial coil cleanser Check condensate drain pan and line if necessary Flush coil and condensate drain with water taking care not to get insula tion filters and return air ducts wet Check connecting lines and coil for evidence of oil and refrigerant leaks E Condenser Coil Clean condenser coil annually with detergent or com mercial coil cleaner and inspect monthly during the cool ing season Check connecting lines and coil for evidence of oil and refrigerant leaks NOTE If owner complains of insufficient cooling the unit should be gauged and refrigerant charge checked Refer to Gauge Manifold Attachment and Charging sections in this manual F Electrical 1 Check all wiring for loose connections 2 Check for correct voltage at unit unit operating 3 Check amp draw on both condenser fan motor and blower motor Fan
150. th 0 10 VDC to control the positioning of economizer The damper actuator provides 2 to 10 VDC position feedback Page 87
151. this manual Use static pressure and RPM readings to determine unit air volume 5 The RPM can be adjusted at the motor pulley Loosen Al len screw and turn adjustable pulley clockwise to increase RPM Turn counterclockwise to decrease RPM See fig ure 13 for LGCO090 150 units and figure 14 for LGC156 300 units Blower Belt Adjustment Proper pulley alignment and belt tension must be main tained for maximum belt life NOTE Tension new belt after 24 48 hours of operation This will allow belts to stretch and seat in grooves 1 Loosen four screws securing blower motor to sliding base See figures 13 and 14 2 To increase belt tension Turn belt tension adjusting screw to the left or coun terclockwise to tighten the belt This increases the dis tance between the blower motor and the blower hous ing To loosen belt tension Turn the adjusting screw to the right or clockwise to loosen belt tension 3 Tighten four screws securing blower motor to sliding base once adjustments have been made Page 46 BLOWER ASSEMBLY LGC090 150 ALIGN TOP EDGES PARALLEL BEFORE TIGHTENING MOTOR IN PLACE BLOWER MOTOR MOUNTING FRAME BLOWER MOTOR BASE TO INCREASE BELT TENSION 1 Loosen four bolts securing motor base to mounting frame 2 Turn adjusting bolt to the right or clockwise to move the motor outward and tighten the belt MOTOR BASE ADJUSTMENT SCREWS 2 EACH SIDE 3 Tighten two bolts on motor pulley side
152. tor amps With Exhaust Fan Less Exhaust Fan With Exhaust Fan Less Exhaust Fan Number Horsepower W Full load amps Locked rotor amps Service Outlet 2 115 volt GFCI amp rating Maximum Overcurrent Protection amps 2 Minimum Circuit Ampacity Optional Power Exhaust Fan 24 Service Outlet 115 volt GFCI amp rating Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus and minus 10 of line voltage 1 3 2729 1 3 2 4 20 25 25 20 25 19 20 23 18 19 22 1 1 3 IIS 1 1 3 249 1 0 1 9 15 15 LGC120S R 22 LGC120S R 410A 5757 15 4 30 8 74 14 8 5 9 11 8 20 5 41 9 6 19 2 7 6 15 2 124 248 59 6 119 2 494 98 8 155 310 75 150 54 108 24 48 1 3 26 0 2 0 24 4 8 1 3 2 6 1 0 2 0 E 7 8 4 24 4 8 9 3 8 4 9 9 4 24 4 8 1 9 3 8 3 3 3 3 5 e gt 37 15 22 137 1 5 22 37 15 22 37 15 22 37 22 37 75 10 6 16 7 34 48 76 27 39 61 75 106 e 34 48 76 27 39 6 1 46 9 66 20 4 26 8 45 6 16 2 23 4 36 6 46 9 66 105 20 4 26 8 45 6 23 4 36 6 60 60 70 30 30 35 20 25 25 80 80 E 35 35 40 30 30 50 53 59 24 26 29 19 21 23 61 64 71 29 31 24 27 1 173 249 1 173 249 1 1 3 249 1 1 3 249 1 1 3 249 249
153. ts K10 1 close energizing condenser fan B4 and N C contacts K10 2 open de en ergizing compressor crankcase heaters HR1 and HR2 N O contacts K68 1 close energizing condenser fan B5 2nd Stage Cooling compressor B2 is energized 12 Second stage cooling demand energizes Y2 13 24VAC is routed through TB34 to compressor 2 module A57 After A57 proves N C low pres sure switch S88 N C freezestat S50 and N C high pressure switch S7 compressor contactor K2 is energized 14 N O contacts K2 1 close energizing compressor B2 Page 78 GAS HEAT FOR LGC090 150 UNITS A A 1 2 510 de 2 99 3 lt 88 SG 521 LO 2 POWER gt s 2 SO SENSE Q 6 DENOTES OPTIONAL COMPONENTS 15 WHITE RED DESCRIPTION CONTROL BURNER 1 20 20 PANEL MAIN 13 MOTOR COMBUSTION AIR BLOWER CAPACITOR COMB AIR BLOWER MOTOR 1 4 FUSE 50C LOW AMBIENT KIT 560 3 VALVE GAS HEATER 50C LOW AMBIENT KIT JACK GAS LIM JACK GAS 561 JACK GAS 1 HR6 JACK GAS 1 00 WW JACK BLOWER amp COOL 1 CONTROL JACK CGA 50C LOW AMBIENT RELAY COMBUSTION AIR BLOWER KIT OPTIONAL PLUG GAS LIM 120 USED ON 460V AND LUG GAS 575V UNITS ONLY LUG GAS 1 OUTPUT LUG BLOWER amp COOL CO
154. which power the blower motor This button stops blower motor operation as long as it is pressed in FIGURE 6 SIEMENS OVERLOAD RELAY BLUE RESET BUTTON IN FACTORY SET AUTO MODE Turn clockwise to H for manual reset GREEN TRIP INDICATOR Flush with surface not tripped Above surface tripped RED TEST BUTTON AMP ADJUSTMENT DIAL Adjust relay amp setting according to value given on the blower motor nameplate Proper relay amp setting equals motor nameplate FLA X service factor of 1 15 X 95 Use small slotted screwdriver to adjust control mode from automatic reset A to manual reset H Control must be in the manual reset mode H to perform a test Press the red test button Green trip indicator should pop out Press the blue reset screw to reset the relay FIGURE 7 Page 38 INTEGRATED MODULAR CONTROL BOARDS The Integrated Modular Control IMC is a series of control boards which integrates most control functions required for the LGC units The control boards are located in the upper left hand corner of the control box The control includes com plete unit diagnostics with permanent code storage field programmable control parameters and control options on site testing and serial communications Several dif ferent printed circuit boards see figure 8 for LGC090 150 and figure 9 for LGC156 300 make up the modular configurations for the LGC 7 5 to 30 ton units For further information refer to Integrated Modul
155. y the gas valve control module 58 after a first stage heating de mand from the thermostat K19 remains energized through out the first stage heating demand When energized K19 N O contacts close to energize the second heat section com bustion air blower and begin second section heating se quence Prove switch S45 located in the compressor compartment closes as combustion air static pressure falls to prove combustion air blower operation When S45 closes the second section of the ignition control and gas valve are energized to begin the second section heating sequence 13 Low Ambient Switch Relay K159 LGC156 180 Low ambient switch relay K159 used in all LGC156 180 units is a DPDT relay with a 24VAC coil When one of the N O low pressure low ambient switches S11 S84 or S85 close due to a pressure rise K159 is energized When K159 1 closes A55 energizes K10 which in turn energizes outdoor fan motor B4 When K159 2 closes 59 energizes K149 which in turn ener gizes outdoor fan motor B21 When the pressure lowers due to the outdoor fan motors cycling on the pressure switch es will open and K159 will be de energized 14 Burner Controls A3 amp A12 LGC156 300 LGC156 300 units have two burner controls A3 controls gas heat section one while A12 controls gas heat section two The first gas heat section and the second gas heat section burner controls are identical Both burner controls are factory set and are not a
156. y 125 50 with power exhaust 60 Minimum Circuit Unit only 48 Disconnect sas 25 TON STANDARD EFFICIENCY R 410A LGC300S4 Voltage 60hz 3 phase 208 230V 460V 575V Compressors Rated Load Amps total 22 4 89 6 10 6 42 4 7 7 30 8 4 Locked Rotor Amps total 149 596 75 300 54 216 Outdoor Fan Full Load Amps total 3 12 1 5 6 1 2 4 8 Motors 4 Locked Rotor Amps total 6 24 3 12 2 9 11 6 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 2 4 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4 7 94 24 4 8 1 9 3 8 Service Outlet 115V GFI 75 Amps Indoor Blower Horsepower 5 7 5 10 5 7 5 10 5 7 5 10 Motor Rated LoadAmps 167 242 308 76 11 14 6 1 9 11 Locked 105 152 193 45 6 66 84 36 6 54 66 T Maximum Unit only 125 150 150 60 70 70 50 50 60 with power exhaust 150 150 175 70 70 80 50 50 60 2 Minimum Circuit Unit only 124 132 138 59 63 66 44 47 49 Ampacity with power exhaust 129 137 143 62 65 68 46 49 51 Disconnect 84 14 84Mi5 84M13 84M13 NOTE Extremes of operating range are plus and minus 1096 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 20 BLOWER DATA LGC090 150 BELT DRIVE BLOWER BASE UNIT BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY NO HEAT SECTION WITH DRY INDOOR COIL AND AIR FI
157. y 38 Disconnect m 17 5 TON HIGH EFFICIENCY R 22 LGC210H2 Voltage 60hz 3 phase 208 230V 460V 575V Compressors Rated Load Amps total 14 7 58 8 7 1 28 4 5 1 20 4 4 Locked Rotor Amps total 91 364 50 200 37 148 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 6 2 1 4 Motors 4 Locked Rotor Amps total 4 7 188 24 9 6 1 9 7 6 Standard Power Horsepower W 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 2 4 4 8 3 2 1 2 Locked Rotor Amps total 4 7 9 4 A 4 1 9 3 8 Service Outlet 1159 GFI 75 Amps Indoor Blower Horsepower 3 5 7 5 3 5 7 5 3 5 7 5 Motor Rated Load Amps 106 167 242 4 8 7 6 11 3 9 6 1 9 Locked Rotor Amps 66 105 152 268 456 66 234 366 54 T Maximum Unit only 90 100 110 45 50 50 30 35 40 with power exhaust 100 110 125 45 50 60 35 40 45 2 Minimum Circuit Unitonly 83 89 97 41 43 47 30 32 35 with power exhaust 88 94 102 43 46 49 32 34 37 Disconnect as ZUE 17 5 TON HIGH EFFICIENCY R 410A LGC210H4 Voltage 60hz 3 phase 208 230V 460V 575V Compressors Rated Load Amps total 17 9 71 6 7 9 31 6 6 2 24 8 4 Locked Rotor Amps total 91 364 46 184 37 148 Outdoor Fan Full Load Amps total 2 4 9 6 1 3 5 2 1 4 Motors 4 Locked Rotor Amps total 4 7 18 8 24 96 1 9 7 6 Standard Power Horsepower W 1 3 249 1 3 249 1 3 249 Exhaust Fans 2 Full Load Amps total 2 4 4 8 1 3 2 6 1 2 Locked Rotor Amps total 4

LGC 7.5-25 Ton Series

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