WARNING - lennox
Contents
1. K58 LI HOOKUP ON HEATCRAFT CONTROL COMMON 16 0 COMMON Y CMC I 24 RO 2 Qu 0 OUT 8 COM OUT 24V COMMON 24V COMMON DENOTES OPTIONAL COMPONENT CONNECTIONS aaa CONTROL QUTDOOR FAN N FACTORY INSTALLED OPTION COMPRESSOR MOTOR QUTDOOR FAN 1 M VOLTAGE UNITS ONLY 0010008 FAN 1 gt TIMER DEFROST COMPRESSOR 1 REFER TO UNIT RATING PLATE FOR HEATER COMPRESSOR MINIMUM CIRCUIT AMPACITY AND JACK GFI RECEPTACLE MAXIMUM OVERCURRENT PROTECTION JACK TEST COOL SI CONTACTOR COMPRESSOR RELAY DEFROST N WITH 511 amp K58 ON OFF FAN RELAY LATCH LOW AMBIENT CONTROL DISCONNECT RELAY TRANSFER WITH A46 VARIABLE FAN LOW POWER BEFO RELAY OUTDOOR FAN A AMBIENT CONTROL RELAY I SERVICING TUER NL Tc A CRIMARY OF 26 VOLT TRANSFORMER EX BE PHASED WITH B4 FAN MOTOR SENSOR AMBIENT AMPLE IF MOTOR IS HOOKED TO S m amp L5 TRANSFORMER PRIMARY PRESS COMP ALSO BE HOOKED ACROSS ARE N A SWITCH DEFROST TERMINATION A IEN AG d USED CONNEC T SWITCH DISCONNECT WITH A46 HOOK UP GROUND TRANSF ORMER HOFFMEN CONTROL NO2. LENNOX Nr NFORMATION 9713 18 26 4 amp 35 2 kw Service Literature Revised 09 2000 Litho U S A LSA090P 120P HEAT PUMP SERIES UNITS The LSA heat pump units are designed for light commer cial applications with a remotely located blower coil unit or a furnace with an add on evaporator coil Capacities for the series are 7 1 2 and 10 tons 26 4 and 35 2 kW The 54090 120 1 model units use a single speed recipro cating compressor and other parts common to a heat pump LSA090 120 2 model units are equipped with a scroll compressor The LSA heat pumps match with the CB17 blower coil units All LSA units are three phase This manual is divided into sections which discuss the ma jor components refrigerant system charging procedure maintenance and operation sequence Information in this manual is intended for qualified service technicians only All specifications are subject to change Procedures in this manual are presented as recommenda tions only and do not supersede or replace local or state codes AWARNING Refrigerant can be harmful if it is inhaled Refrigerant Improper installation adjustment alteration service or maintenance can cause property damage per f sonal injury or loss of life Installation and service Failure to follow this warning may result in must be performed by a qualified installer or service personal injury or death agency must be used and recovered respo
3. PINE HEAT 4VAC COM gt N NUT REG D WITH SUME TSTATS PUMP UNI RING DIAGRAM WITHDUT AUXILIARY HEAT 5969 9 9 THERMOSTAT FIELD PROVIDED gt TO POWER gt SUPPLY LSA HEAT LOW VOLTAGE MAKE UP BOX CONTROL RELAY r c m lm YELLOW BLOWER MOTOR CONTACTOR RED NS 19 N NUT REQ D WITH SUME TSTATS RED HIGH VOLTAGE RED MAKE UP BUX CBH17 Page 27
4. VALVE FRONT SEATED SERVICE PORT CAP SCHRADER VALVE OPEN TO LINE SET WHEN VALVE IS CLOSED FRONT SEATED OUTLET COMPRESSOR FIGURE 16 To Access Service Port 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6 tum Do not over torque Open Liquid Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Using service wrench and 5 16 hex head extension part 49A71 back the stem out counterclockwise until the valve stem just touches the retaining ring Make sure wrench fits properly to avoid stripping stem 3 Replace stem cap Tighten finger tight then tighten an additional 1 6 turn Page 14 DANGER Do not attempt to backseat this valve past the retaining ring Attempts to backseat this valve past the retaining ring will cause snap ring to explode from valve body under pressure of refrigerant Personal injury and unit damage will result To Close Liquid Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Using service wrench and 5 16 hex head extension part 49A71 tum stem clockwise to seat the valve Tighten firmly 3 Replace stem cap Tighten finger tight then tighten an additional 1 6 turn 2 Vapor Line Service Valve LSA 1 model heat pumps are equipped with a front and back seating vapor line service valves wi
5. 2 2 the switch closes initiating defrost after minimum run time of 30 60 or 90 minutes When the temperature rises to 60 F 5 F 15 6 C 2 890 the switch opens Defrost Pressure Switch Defrost switch S46 is an auto reset SPST N C pressure switch which opens on pressure rise of 275 10 psi 1896 69 kPa When S46 opens defrost operation ends switch will reset when the unit receives a heat call and pressure falls to 195 10 psi 1344 69 kPa All LSA heat pumps are equipped with this switch located on the dis charge line See figures 1 through 4 S46 is wired through the K8 transfer relay to the defrost board CMC1 Page 10 Defrost Relay 4 Defrost relay K4 controls defrost in the LSA units K4 is controlled by defrost board CMC1 and defrost pressure switch S46 When is energized contacts close and de frost is initiated Defrost Control The defrost control board combines functions of a time temperature initiated and time pressure terminated defrost control defrost relay time delay diagnostic LEDs and field connection terminal strip See figure 13 The control provides automatic switching from normal heating operation to defrost mode and back During com pressor cycle call for defrost the control accumulates compressor run times at 30 60 or 90 minute field adjust able intervals If the defrost thermostat remains closed when the accumulated compressor run time ends the de frost relay i
6. ELECTRICAL DATA Model No LSA090P 2 LSA120P 2 Line voltage data 60 hz 3 phase 208 230v 460v 575v 208 230v 460v 575v Rec max fuse or circuit breaker size amps 60 30 25 80 40 25 TMinimum circuit ampacity 39 20 15 53 25 18 Rated load amps 28 8 14 7 10 8 37 8 17 2 12 4 Compressor 1 Locked rotor amps 195 95 80 239 125 80 Outdoor Coil Full load amps total 3 1 5 1 2 2 4 4 8 1 3 2 6 1 2 Fan Motor 1 phase Locked rotor amps total 6 3 2 9 47 94 24 48 19 3 8 TRefer 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 1HACR type under 100 amps U S only Page 3 OUTDOOR FAN B4 REVERSING VALVE L1 COMPRESSOR B1 HIGH PRESSURE SWITCH S4 COMPRESSOR B1 DEFROST PRESSURE SWITCH S46 DEFROST THERMOSTAT SWITCH 56 5124 NOT SHOWN ee Sen LOW AMBIENT SWITCH FIGURE 1 lt 3 x lt o lt n a lt 3 x lt o lt n a a e e lt 9 LSA090P THERMOWELL LIQUID LINE SERVICE VALVE FAN GUARD FAN GUARD CONTROL BOX LINE SERVICE VALVE LOW AMBIENT SWITCH S11 LIQUID LINE SERVICE VALVE SWITCH S24 CONTROL BOX DEFROST THERMO
7. When discharge pressure rises to 410 10 psig 2827 69 kPa the switch opens and the compressor is de energized through the CMC1 The switch will close when discharge pressure drops to 210 20 psig 1447 138 kPa 5 Low Ambient Switch S11 all units The low ambient switch is an auto reset SPST N O pres sure switch which allows for mechanical cooling operation at low outdoor temperatures All LSA heat pumps are equipped with S11 The switch is located in the liquid line In all LSA heat pumps S11 is wired in series with fan relay K10 When liquid pressure rises to 275 10 psig 1896 69 kPa the switch closes and the condenser fan is ener gized When the discharge pressure drops to 150 10 psig 1034 69 kPa the switch opens and the condenser fan is de energized This intermittent fan operation results in higher evaporating temperature allowing the system to operate without icing the evaporator coil and losing capac ity 6 Low Ambient Kit Hoffman Control A46 Optional LSA090P 1 Model The low ambient kit consisits of a control A46 and sensor RT13 Control A46 is located on the outside of the unit near the compressor section Sensor RT13 is located on the liq uid line near the evaporator coil Control A46 allows opera tion of the LSAO9OP units down to 0 F 18 C outdoor am bient As liquid line temperature falls the control reduces fan RPM As liquid line temperature increases the control increases outdoor fan RPM
8. CAPACITOR C1 TERMINAL STRIP TB14 Jo Jo Jo Jo Jo Jo o tel 9 FIGURE 5 LSA120P CONTROL BOX LATCH RELAY SWITCH K6 9 TERMINAL STRIP TB14 o CMCI DEFROST TIMER el ej lel ej lel ej lel el OPTIONAL DISCONNECT COMPRESSOR TRANSFER OUTDOOR FAN RELAY K10 SWITCH CONTACTOR 5 5 548 K1 r sss e e RELAY K8 OW AMBIENT 5122212 OUTDOOR FAN BY PASS RELAY K68 RELAY K58 DEFROST oje RELAY K4 GROUND LUG 4 LOW AMBIENT THERMOSTAT 541 FAN CAPACITORS C1 C2 Y FIGURE 6 Page 6 I UNIT COMPONENTS The LSA090P and LSA120P components are shown in fig ures 1 through 4 A CONTROL BOX COMPONENTS The LSAO90P control box components are shown in figure 5 The LSA120P control box components are shown in fig ure 6 1 Disconne
9. Refer to unit nameplate for correct running amps Three Phase Compressor Rotation Three phase scroll compressors must be phased sequen tially to ensure that the compressor rotates and operates correctly When the compressor starts a rise in discharge and drop in suction pressures indicate proper compressor phasing and operation If discharge and suction pressures do not perform normally follow the steps below to correctly phase in the unit 1 Disconnect the power to the unit 2 Reverse any two field power leads to the unit 3 Reconnect the power to the unit The discharge and suction pressures should operate with in their normal start up ranges NOTE The compressor s noise level will be significantly higher when the phasing is incorrect The compressor will not provide cooling when the unit is not correctly phased Continued backward operation of the compressor to due to incorrect phasing will cause the compressor to cycle on in ternal protector Page 20 VI Wiring Diagram and Sequence of Operation A LSA090P 1 Y G J M 24V POWER 24V POWER ECON ECONOMIZER BLOWER G Bl4 BLOWER Wi HEAT I WI HEAT 2 W2 CMC I RANCO DEFROST COOL I YI CONTROL Y m LETTER COM FAN DESIGNATION VOLTAGE y out 208 250 60 5 460 60 5 75 60 5 52 380 420 5073
10. TEST COOL KI 1 CONTACTOR COMPRESSOR RELAY LATCH RELAY OUTDOOR 1 K58 T 2 RELAY LOW AMB KIT 68 001000 FAN 2 VALVE REVERSING IPSG K P36 IPLUG TEST COOL FACTORY INSTALLED OPTION S4 SWITCH LIMIT HI PRESS COMP 1 SWITCH DEFROST ZX REFER TO UNIT RATING PLATE FOR SWITCH LOW PRESS LOW AMB KIT MINIMUM CIRCUIT AMPACITY AND SWITCH LOSS OF CHARGE MAXIMUM OVERCURRENT PROTECTION 1 THERMOSTAT LOW AMBIENT KIT SIZE SWITCH DEFROST TERMINATION SWITCH DISCONNECT IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH 5124 SWITCH DEFROST AUX 12071760 WIRE OF LIKE SIZE RATING AND 1814 TERMINAL STRIP CLASS 11 VOLTAGE INSULATION THICKNESS M VOLTAGE UNITS ONLY DISCONNECT ALL POWER BEFORE SERVICING WIRING DIAGRAM 4 97 HEAT PUMP OUTDOOR UNITS FOR USE WITH COPPER CONDUCTORS ONLY LSA 120P Y 6 J M WARNING ELECTRIC SHOCK HAZARD CAN CAUSE ee esee PERIERE C RETE upersedes orm 9 ow orm 9 9551 675W 532 502W 0 1997 Lennox Industries Inc Litho U S A Page 24 D LSA120P 2 Y G J M 24V POWER 24V POWER ECONOMIZER 14 BLOWER G m BLOWER HEAT I WI ST w L HEAT 2 W2 9 81197 58 2 D RB COOL O 2 D 6 136 CMC RANCO DEFROST CONTROL DESIGNATION VOLTAGE Y 1208 230 6073 Re 480 60 3 57576073 COMMON DF COMMON DENOTES OPTIONAL COMPONENT CONNECTIONS APA OR QUTDOOR FA
11. L COMPRESSOR lize scroll compressor DISCHARGE The scroll compressor de sign is simple efficient and requires few moving parts A cutaway diagram of the scroll compressor is shown in figure 8 The scrolls are located in the top of the compressor can and the motor is located in the bottom of the com pressor can The oil level is immediately below the motor and oil is pressure fed to the moving parts of the compressor The lower portion of the compressor shell is exposed to low side pressure while only the very top of the shell is exposed to high side pressure hag ay 4 suction FIGURE 8 scroll is simple compression concept centered around the unique spiral shape of the scroll and its inherent properties Figure 9 shows the basic scroll form Two iden tical scrolls are mated together forming concentric spiral shapes figure 11 One scroll remains station ary while the other is al lowed to orbit figure 10 1 Note that the or biting scroll does not ro tate or turn but merely orbits stationary scroll FIGURE 9 Page 8 SUCTION ORBITING SCROLL STATIONARY SCROLL SUCTION POCKET SUCTION 32 INTERMEDIATE PRESSURE GAS 2 CRECENT SHAPED GAS POCKET FLANKS SEALED 7 BY CENTRIFIGUAL SUCTION FORCE SUCTION 2 MOVEMENT ORBIT HIGH PRESURE GAS DISCHARGE POCKET FIGURE 10 The counterclockwise orbiting scroll draws gas into
12. N TIMER DEFROST COMPRESSOR HEATER COMPRESSOR JACK GFI RECEPTACLE JACK TEST COOL CONTACTOR COMPRESSOR IRELAY DEFROST ooo U REA LATCH Z RELAY OUTDOOR FAN RELAY LOW AMB KIT RELAY OUTDOOR FAN 2 VALVE REVERS ING xs PLUS TEST coy N FACTORY INSTALLED OPTION SWITCH LIMIT HI PRESS 1 S5 THERMOSTAT DISCHARGE LINE ZX REFER TO UNIT RATING PLATE FOR 56 SWIICH DEFROST MINIMUM CIRCUIT AMPACITY AND SWITCH LOV PRESS MAXIMUM OVERCURRENT PROTECTION 524 SWITCH LOSS OF CHARGE SIZE S41 THERMOSTAT LOW M KIT REPLACED IT MUST BE REPLACED WITH 248 ON 120 1 60 WIRE OF LIKE SIZE RATING AND Rr IAN DEPOST AUX INSULATION THICKNESS fel 1 A OLTA N VOLTAGE UNITS ONLY WIRING DIAGRAM 0800 HEAT PUMP OUTDOOR UNITS DISCONNECT ALL POWER BEFORE SERVICING FOR USE WITH COPPER CONDUCTORS ONLY LSA 120P 2 6 J M Y WARNING ELECTRIC SHOCK HAZARD CAN CAUSE GROUNDED IN ACCORDANCE WITH HEAT PUMP SECTION B4 HUI MUTET 532 502W 555 3589W 0 2000 Lennox Industries Inc Litho U S A Page 25 SEQUENCE OF OPERATION LSA120P After each thermostat demand time delay locks out the circuit to compressor contactor coil and defrost control for 5 2 minutes At the end of the time period the time delay allows the compressor contactor and defrost control to be energized upon demand COOLING 1 Cooling demand energizes through termi
13. SA120P tested with CB17 CBH17 135V Page 19 IV MAINTENANCE At the beginning of each cooling season the system should be checked as follows AWARNING Electric shock hazard Can cause inju ry or death Before attempting to per form any service or maintenance turn the electrical power to unit OFF at dis g connect switch es Unit may have multiple power supplies Outdoor Unit 1 Clean and inspect the condenser coil You can flush the coil with a water hose 2 The outdoor fan motor is prelubricated and sealed No further lubrication is necessary 3 Visually inspect connecting lines and coils for evi dence of oil leaks 4 Check wiring for loose connections 5 Check for correct voltage at the unit while the unit is op erating and while it is off 6 Check amp draw of the outdoor fan motor Unit nameplate Actual Check amp draw of the compressor Unit nameplate Actual NOTE Ifthe owner complains of insufficient cooling gauge the unit and check the refrigerant charge Re fer to section on refrigerant charging in this instruc tion Indoor Coil 1 If necessary clean the coil 2 Check connecting lines and coils for evidence of oil leaks 3 If necessary check the condensate line and clean it Indoor Unit 1 Clean or change filters 2 Adjust the blower speed for cooling Measure the pres sure drop over the coil to determine the correct blower CFM Refer to the unit information s
14. STAT SWITCH S6 SUCTION VAPOR HIGH PRESSURE LOSS OF CHARGE SUCTION VAPOR LINE SERVICE VALVE SWITCH THERMOWELL FIGURE 2 Page 4 LSA090P 2 MODEL PARTS ARRANGEMENT CONTROL BOX DEFROST THERMOSTAT SWITCH S6 DEFROST PRESSURE SWITCH S46 VAPOR LINE SERVICE VALVE LOSS OF CHARGE SWITCH S24 CONTROL BOX DEFROST THERMOSTAT SWITCH S6 LOW AMBIENT SWITCH LOSS OF CHARGE SWITCH S24 LIQUID LINE SERVICE VALVE FAN GUARD OUTDOOR FAN B4 REVERSING VALVE L1 COMPRESSOR B1 A TN ry L5 HIGH PRESSURE SWITCH 54 N I X LOW AMBIENT SWITCH S11 W LIQUID LINE SERVICE VALVE m OUTDOOR FANS gt REVERSING VALVE L1 COMPRESSOR B1 gt HIGH PRESSURE SWITCH S4 IA ee FN DEFROST PRESSURE SWITCH 546 VAPOR LINE SERVICE VALVE FIGURE 4 Page 5 LSA090P CONTROL BOX o o COMPRESSOR 9 LOW AMBIENT CONTACTOR BY PASS RELAY K1 OUTDOOR FAN u K58 RELAY K10 DE e 5 DEFROST S48 CNCI RELAY K4 GROUND o LUG DEFROST TIMER o LATCH RELAY SWITCH K6 FAN
15. TE TERMINAL STRIP CLASS II VOLTAGE USE COPPER DISCONNECT ALL POWER BEFORE SERVICING WIRING DIAGRAM ONLY H IF ANY WIRE IN THIS APPLIANCE IS REPACED HEAT PUMP OUTDOOR UNITS 120 1 6 IT MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING AND INSULATION THICKNESS LSA 090P Y 6 J M WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN HEAT PUMP SECTION B4 ACCORDANCE WITH NATIONAL AND LOCAL CODES Supersedes Form No New Form 552 501W 532 651W 1998 Lennox Industries Inc Litho U S A Page 21 B LSA090P 2 Y G J M 24V POWER ECONOMIZER BLOWER G HEAT I WI HEAT 2 W2 DESIGNATION VOLTAGE LY 208 250 60 5 460 60 5 4 575 60 3 24V COMMON n C DENOTES OPTIONAL COMPONENT CONNECTIONS h DISCONNECT ALL POWER BEFORE x SERVICING COMPRESSOR N FACTORY INSTALLED OPTION 010 0 DOOR APA DR D DOOR TIMER DEFROST COMPRESSOR 1 HR HEATER M 0 Jil RECEPTACLE 36 5 cooL 1 CONTACTOR COMPR OR K4 1 3 RELAY DEFROST RELAY LATCH K8 1 2 RELAY TRANSFER 1 2 RELAY OUTDOOR FAN T 6 IPLUG TEST COOL 5 SENSOR AMBIENT 4 SWITCH LIMIT HI PRESS COMP AMB H RSIN 00 A M VOLTAGE UNITS ONLY REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACIT
16. This operation like Low Ambi ent Switch 511 results in higher evaporator temperature allowing the system to operate without icing in the evapo rator coil and losing capacity Page 9 7 Discharge Line Thermostat S5 S5 is an automatic reset SPST N C switch which opens on a temperature rise The switch is located on the discharge line and wired in series with the CMCI board and S4 pres sure switch When discharge line temperature rises to 275 5 the switch opens and the compressor is de en ergized through the The switch automatically resets when discharge temperature drops to 225 5 F 8 Loss of Charge Switch S24 LSA 1 Models The loss of charge switch is an auto reset SPST N O switch which opens on pressure drop The switch is lo cated on the suction line and is wired to the defrost control board CMC1 When suction pressure drops to 15 5 psig 103 34 kPa the switch opens and the compressor is de energized The switch automatically resets when pressure in the suction line rises to 25 5 psig 172 34 kPa 9 Loss of Charge Switch S24 LSA 2 Models The loss of charge switch is an auto reset SPST N O switch which opens on pressure drop The switch is lo cated on the liquid line and is wired to the defrost control board CMC1 When liquid pressure drops to 25 5 psig 172 34 kPa the switch opens and the compressor is de energized The switch automatically resets when pressure in the liquid li
17. Y AND MAXIMUM OVERCURRENT PROTECTION SIZE A WITH 511 4 K58 ON OFF LOW AMBIENT CONTROL Ay WITH A46 VARIABLE FAN LOW AMBIENT CONTROL PRIMARY OF 24 VOLT TRANSFORMER A MUST BE PHASED WITH B4 FAN MOTOR EXAMPLE IF MOTOR IS HOOKED TO LI amp L5 TRANSFORMER PRIMARY MUST ALSO BE HOOKED ACROSS LI amp L 524 SWITCH LOSS ROE ZA WHEN K46 IS USED CONNECT SWITCH LOSS OF CHARGE 546 1 5 TERMINATION 58 1 CONTACTS AS SHOWN W H D ONN GROUND 548 SWITCH DISCONNECT MITES DR NOTE USE COPPER DISCONNECT ALL POWER BEFORE SERVICING WIRING DIAGRAM 120 1 60 HEAT PUMP OUTDOOR UNITS ANY WIRE IN THIS APPLIANCE IS REPACED CED WITH WIRE DF LIKE SIZE RATING AND INSULATION THICKNESS LSA 090P 2 6 J M Y WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN HEAT PUMP SECTION B4 ACCORDANCE WITH NATIONAL AND LOCAL CODES Supersedes Form No New Form No 532 65 W 533 588W 2000 Lennox Industries Inc Litho U S A Page 22 1 1 1 1 1 SEQUENCE OF OPERATION LSA090P After each thermostat demand time delay locks out the circuit to compressor contactor coil and defrost control for 5 2 minutes At the end of the time period the time delay allows the compressor contactor and defrost control to be energized upon demand COOLING Cooling demand energizes through terminal Y1 at the indoor thermostat
18. acts close energizing compressor B1 7 K8 2 contacts close sending 24V from G1 ener gizing indoor blower DEFROST MODE 7 During heating operation when outdoor coil drops be low 4 F the defrost thermostat S6 closes When S6 closes K4 defrost relay is energized If defrost ther mostat remains closed at the end of 30 60 or 90 min utes defrost control energizes and defrost begins 8 When defrost control energizes reversing valve L1 and indoor heat relay are energized Outdoor fan is de energized 9 Defrost continues until 14 1 minutes have elapsed or until S46 defrost pressure switch opens When defrost pressure switch opens to terminate defrost the defrost timer loses power and resets Defrost timing is stopped until the next call for defrost when defrost thermostat closes C LSA120P 1 Y G J M 24V POWER 24V POWER ECONOMIZER 1814 BLOWER G al BLOWER HEAT I WI HEAT 2 W2 COOL I YI CMC RANCO DEFROST CONTROL DESIGNATION VOLTAGE Y _ 208 250 60 5 6 460 60 5 3 1 575 60 5 L M A Ll380 420 50 35 I So COMMON CONTROL DF COMMON DENOTES OPTIONAL DESCR ON COMPONENT CONNECTIONS OMPONEN OMPRESSOR BI B4 MOTOR OUTDOOR 1 B5 MOTOR OUTDOOR FAN 2 LC A c2 0 DOOR CMC I TIMER DEFROST COMPRESSOR HEATER COMPRESSOR JI 3 RECEPTACLE J36 JACK
19. an upright bottle of HCFC 22 refrigerant Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close man ifold gauge valves and shut off HCFC 22 bottle and re move manifold gauge set Page 17 C Charging If the system is completely void of refrigerant the recom mended and most accurate method of charging is to weigh the refrigerant into the unit according to table 3 or 4 If weighing facilities are not available or if unit is just low on charge the following procedure applies The following procedures are intended as a general guide for use withexpansion valve systems only For bestresults indoortemperature should be between 70 F 21 C and 80 F 26 6 Outdoor temperature should be 60 F 15 5 orabove Slight variations charging temperature and pressure should be ex pected Large variations may indicate aneed for further servicing IMPORTANT Use tables 6 and 7 as a general guide for performing maintenance checks Tables 6 and 7 are not a proce dure for charging the system Minor variations in these pressures may be expected due to differ ences in installations Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the sys tem Used prudently tables 6 and 7 could serve as a useful service guides A IMPORTANT The following procedure requires accurate read ings of ambient outdoor temperature
20. at demand is satisfied or when a pressure switch resets If thermostat demand is satisfied and the off cycle is greater than 5 min utes the compressor will energize immediately on next heating or cooling demand 3 Pressure Switch Safety Circuits The defrost control incorporates a pressure switch safety circuit that allows the application of an additional pressure switch high pressure switch S4 is factory wired to this cir cuit See figure 13 PS1 and PS2 terminals are internally connected in series with a jumper internal to the control board During one demand cycle the defrost control will lock out the unit on the third instance that the unit goes off on any auto reset pressure switch wired to this circuit The diag nostic LEDs will display a pattern for a locked out pressure switch on the third open pressure switch occurrence See table 1 The unit will remain locked out until power is broken then remade to the control The PS2 safety circuit terminals are connected to the com pressor thermostat 4 Diagnostic LEDs The defrost board uses two LEDs for diagnostics The LEDs flash a specific sequence according to the condi tion See table 1 on page 9 5 Ambient Thermistor amp Service Light Connection The defrost control board provides terminal connections for the ambient thermistor and service light These activate the room thermostat service light during periods of ineffi cient operation The thermistor compensates f
21. ay K6 and transfer relay K8 allows the LSA heat pumps to use a conventional heat cool thermostat instead of a heat pump thermostat A latch relay figure 7 has two coils a SET coil and a RESET coil When 24VAC is applied to the SET coil the normally open contacts close and the normally closed con tacts open When power is removed from the SET coil nothing happens the NO contacts remain closed and the N C contacts remain open The contacts do not return to their normal position until the RESET coil is energized Once the contacts are reset they remain in their normal position when power is removed LATCH RELAY K6 LSA heat pumps use a DPDT latch relay Each set of normally open contacts controls a reversing valve When the SET coil is ener gized the normally open contacts close to energize the reversing valve there by placing the unit in the cooling mode When pow er is removed from the SET coil such as when thermostat demand is satis fied the normally open contacts remain closed the reversing valve remains en ergized and the unit re FIGURE 7 mains in the cooling mode When heating demand is initiated the RESET coil is en ergized The normally open contacts open and the revers ing valve is de energized thereby placing the unit in the heating mode When heat demand is satisfied and power to the RESET coil is removed the normally open contacts remain open
22. conditioning system Oxygen will explode on contact with oil and could cause personal inju ry Use nitrogen only for this purpose and be sure to use a regulator that can control the pres sure down to 1 or 2 psig 6 9 to 13 8 kPa CAUTION Any nitogen cylinder connected to system must have a 150 psig maximum setting regulator Never introduce pressures greater than 150 psig to any refrigerant system A Leak Testing Using an Electronic Leak Detector or Halide 1 Connect a cylinder of nitrogen with a pressure regulat ing valve to the center port of the manifold gauge set Connect the high pressure hose of the manifold gauge set to the service port of the suction valve Normally the high pressure hose is connected to the liquid line port however connecting it to the suction port better protects the manifold gauge set from high pressure damage 3 With both manifold valves closed open the valve on the HCFC 22 bottle vapor only 4 Open the high pressure side of the manifold to allow HCFC 22 into the line set and indoor unit Weigh trace amount of HCFC 22 A trace amount is enough refrigerant to equal 3 pounds 31 kPa pressure Close the valve on the HCFC 22 bottle and the valve on the high pressure side of the manifold gauge set Disconnect HCFC 22 bottle 5 Adjust nitrogen pressure to 150 psig 1034 kPa Open the valve on the high side of the manifold gauge set which will pressurize line set and indoo
23. ct Switch S48 Optional all units LSA heat pumps units may be equipped with an optional disconnect switch S48 S48 is a factory installed toggle switch used to disconnect power to the unit 2 Outdoor Fan Capacitors C1 all units and C2 120P All LSA units use single phase condenser fan motors Mo tors are equipped with a fan run capacitor to maximize mo tor efficiency Outdoor fan capacitors C1 and C2 assist in the start up of condenser fan motors B4 and B5 Capacitor ratings are on outdoor fan motor nameplates 3 Compressor Contactor K1 all units All compressor contactors are three pole double break contactors with a 24V coil K1 energizes compressor B1 in both LSA090P and 120P units The contactor is energized from indoor thermostat terminal Y when thermostat de mand is present 4 Low Ambient Thermostat S41 120P only S41 is a limit which opens on temperature fall at 55 5 F The switch resets when temperature rises to 65 6 F 541 opens and de energizes K68 which de energizes out door fan B5 When S41 closes fans will be re energi zed This intermittent fan operation increases indoor evap orator coil temperature to prevent icing 5 Latch Relay K6 all units LSA heat pumps units are plumbed so that the unit is in cooling mode when the reversing valve is energized Latch relay K6 controls operation of the reversing valve and is controlled indirectly by the indoor thermostat The combined operation of latch rel
24. d in mm connection sweat 1 3 8 34 9 Shipping weight Ibs kg 1 package 1 Model 490 222 1 Model 604 274 ELECTRICAL DATA Model No LSA090P 1 LSA120P 1 208 230 460 575 208 230 460 575 Ine vollage 3ph 3ph Compressor 1 Condenser Gol Fu load amps oa 5 12 1309 10 Fan Motor 1 phase Locked rotor amps total EEEE 4 7 9 4 2 4 4 8 1 9 3 8 TRefer 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 1HACR type under 100 amps U S only Page 2 SPECIFICATIONS Model No LSA090P 2 LSA120P 2 Nominal Size Tons kW 7 5 26 4 10 35 2 Net face area Outer coil 21 80 2 03 29 34 2 73 UM EE S S NE NEL EN Outdoor Inner coil 20 94 1 95 Tube diameter in mm amp no of rows 3 8 9 5 Diameter in mm amp no of blades 1 24 610 4 2 24 610 3 Motor hp W 1 1 2 373 2 1 3 249 Outdoor Coil Cfm L s total air volume 5300 2500 8200 3870 Fan s 0 9 m j Liquid line o d in mm connection sweat 5 8 15 9 Vapor line mm connection sweat 1 3 8 34 9 Shipping weight Ibs kg 1 package 2 Model 506 230 2 Model 626 284
25. ervice manual for pressure drop tables and procedure 3 On belt drive blowers check the belt for wear and proper tension 4 Check all wiring for loose connections 5 Check for correct voltage at the unit blower operat ing 6 Check amp draw on blower motor Unit nameplate Actual V STARTUP The following is a general procedure and does not apply to all thermostat control systems Refer to sequence of op eration in this manual for more information WARNING Crankcase heaters must be energized for 24 hours before attempting to start compressors Set ther mostat so there is no compressor demand before closing disconnect switch Attempting to start compressors during the 24 hour warm up period could result in damage or failed compressors 1 Rotate the fan to check for frozen bearings or binding 2 Inspect all factory and field installed wiring for loose connections 3 Refer to charging section to accurately charge and check the charge on this unit 4 Check voltage supply at the disconnect switch The voltage must be within range listed on unit nameplate If not do not start equipment until the power company has been consulted and the voltage condition cor rected 5 Set thermostat for a cooling demand turn on power to blower and close heat pump unit disconnect switch to start 6 Recheck unit voltage with unit running Power must be within range shown on unit nameplate Check amper age draw of unit
26. essor failure gauge valves to release the nitrogen from the line set Damage caused by deep vacuum operation will and indoorunit void warranty 7 Reconnect the manifold gauge to the vacuum pump turn the pump and continue to evacuate the line set A temperature vacuum gauge mercury vacuum and indoor unit until the absolute pressure does not U tube or thermocouple gauge should used rise above 5mm of mercury within a 20 minute period The usual Bourdon tube gauges are not accurate after shutting off the vacuum pump and closing the enough in the vacuum range manifold gauge valves 2 Connect the vacuum pump with vacuum gauge to the 8 Depending on the equipment used to determine the center port of the manifold gauge set vacuum level absolute pressure of 5mm of mercury is Open both manifold valves and start vacuum pump equal to 500 microns 4 Evacuate the line set and indoor unit to an absolute 9 When the absolute pressure requirement above has pressure of 23mm of mercury or approximately 1 inch of mercury During the early stages of evacuation it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in absolute pressure A rapid rise in pressure indicates a relative ly large leak If this occurs the leak testing procedure must be repeated after the leak is repaired been met disconnect the manifold hose from the vacu um pump and connect it to
27. liquid tem perature and liquid pressure for proper charging Use a thermometer with accuracy of 2 F and a pressure gauge with accuracy of 5 PSIG 1 Attach gauge manifolds and operate unit in cooling mode until system stabilizes approximately 5 min utes 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 table 6 or 7 to deter mine 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 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 liquid pressure is high remove refrigerant from the system If discharge pressure is low add refrigerant to the system Add or remove charge in increments e Allow the system to stabilize each time refrigerant is added or removed 7 Use the following approach method along with the nor mal operating pressures to confirm readings APPROACH METHOD TXV SYSTEMS Ambient Temperature of 60 F 16 C or above 1 Use the same thermometer to take both the liquid line temperature and the outdoor ambient tempera ture Compare liquid line temperature to the outdoor ambient temperature A
28. m the thermo stat to control box components 9 Low Ambient Bypass Relay K58 all units K58 is a normally closed DPDT relay with a 24V coil used in both LSA090P and LSA120P units K58 is wired parallel with the reversing valve L1 When L1 is energized in the cooling cycle K58 is also energized opening K58 1 On the LSA120P K58 1 and K58 2 will open This shuts off power to the outdoor fans but does not by pass S11 and 541 which allow fans to cycle during cooling demand Dur ing heating demand K58 remains closed by passing S11 and S41 so fans can operate 10 GFI J11 Optional Factory Installed LSAP units may be equipped with a 110v ground fault in terrupter GFI The GFI is located on the control box panel on the 90 and120P Separate wiring must be run for the 110v receptacle B COOLING COMPONENTS A IMPORTANT ALL major components indoor blowerlcoil must be matched to Lennox recommendations for com pressor to be covered under warranty Refer to En gineering Handbook for approved system match ups 1 Reciprocating Compressor B1 LSA 1 Models All LSA 1model heat pumps use reciprocating compres sors Compressor B1 operates during cooling and heating demand and is energized by contactor K1 upon receiving thermostat demand See compressor nameplate or ELEC TRICAL DATA section in this manual for compressor spec ifications 2 Scroll Compressor B1 LSA 2 Models All LSA 2 model units uti SCROL
29. n finger tight then tighten an additional 1 6 turn Page 15 VAPOR LINE SERVICE VALVE VALVE OPEN LSA 1 MODELS our er TO COMPRESSOR SERVICE PORT I SERVICE SERVICE PORT PORT SERVICE PORT INLET TO CAP lt INDOOR COIL STEM CAP s NOTE WHEN VALVE IS FRONT SEATED SERVICE PORT IS NOT ISOLATED BLOCKED OFF FROM SYSTEM FIGURE 17 VAPOR LINE BALL TYPE SERVICE VALVE LSA 2 MODELS VALVE OPEN USE ADJUSTABLE WRENCH ROTATE STEM CLOCKWISE 90 TO CLOSE ROTATE STEM COUNTER CLOCKWISE 90 TO OPEN STEM CAP TO INDOOR COIL SCHRADER VALVE FIGURE 18 lll CHARGING LSA heat pumps are field charged with the amount of HCFC 22 refrigerant indicated in the charging procedure This charge is based on a matching indoor coil and outdoor Coil with a 25 foot 7 6 m line set For varying lengths of line set refer to table 3 or 4 for refrigerant charge adjustment for LSAO90P and 120P series units Units are designed for line sets up to 50 ft 15 24 m Consult Lennox Refrigerant Piping Manual for line sets over 50 ft 15 24 m TABLE 3 1 MODELS UNIT HCFC 22 FOR 25 FT 7 6M Adjust per 1ft LINE SET 3m LSA090P 1 22 Ibs 12 ozs 10 0kg 340g 2 ozs 579 LSA120P 1 29 Ibs 8 ozs 13kg 2279 2 ozs 57g If line set is greater than 25 ft 7 6m add this amount If line set is less than 25 ft 7 6m subtract this amount A WARNING Never use oxygen to pressurize refrigeration or air
30. nal Y1 at the indoor thermostat 2 Voltage passes through N C K8 1 to CMCI defrost control K6 set coil is energized 3 N O K6 1 latching relay contacts close energizing L1 reversing valve 4 K58 low ambient relay is energized N C K58 1 con tacts open eleminating the 511 and 541 by pass 5 Voltage passes through S11 low pressure switch switch will close provided liquid line pressure rises to 275 10 psig energizing K10 outdoor fan relay 1 N O K10 1 contacts close energizing outdoor fan B4 N C K10 2 contacts open de energizing HR1 crank case heater 6 Voltage passes through S41 low ambient switch ener gizing K68 outdoor fan relay 2 N O K68 1 contacts close energizing outdoor fan B5 7 Compressor contactor K1 is energized N O K1 1 contacts close energizing compressor B1 8 G from indoor thermostat sends 24V through K8 2 N C contacts to G1 energizing indoor blower HEATING 1 Heating demand energizes through terminal W1 at the indoor thermostat 2 8 transfer relay is energized K8 1 contacts open and N O contacts close sending voltage to defrost control K6 set coil is energized 3 N O K6 1 latching relay contacts open de energizing L1 reversing valve 4 K58 low ambient relay is de energized N C K58 1 contacts close by passing S11 low ambient switch and 541 low ambient thermostat 5 K10 outdoor fan relay is energized N O K10 1 con tacts close energizing
31. ne rises to 55 5 psig 379 34 kPa 10 Reversing Valve L1 all units A reversing valve with an electromechanical solenoid is used to reverse refrigerant flow during unit operation L1 is energized during cooling demand and defrost See figures 14 and 15 11 Expansion Valves all units The LSA120P uses two expansion valves in the liquid line adjacent to the left and right refrigerant coil LSA090P has one expansion valve A liquid line filter drier and check valve are connected in parallel with each expansion valve The check valve allows for reverse refrigerant flow Expan sion valve control is provided by a superheat sensing bulb which is connected by cap tube to the expansion valve The sensing bulb is strapped to the vapor line where it exits the coil If the bulb senses inadequate superheat the ex pansion valve throttles down and restricts refrigerant flow through the coil When excessive superheat is sensed the valve opens to allow more refrigerant flow through the coil See figures 14 and 15 12 Condenser Fan 4 all units B5 120P See page 2 for the specifications on the condenser fans used in the LSA heat pumps All condenser fans have single phase motors The LSA090P units are equipped with a single condenser fan The LSA120P is equipped with two fans The fan assembly may be removed for ser vicing by removing the fan grill and turning the assembly until the motor brackets line up with the notches in the t
32. nents Take precautions during unit instal lation and service to protect the unit s electronic controls Precautions will help to avoid control To Protect Compressor with LED 2 with LED 1 Pressure Switch Open Of o Pressure Switch Lockout on or Board Malfunction 071 exposure to electrostatic discharge by putting the unit the control and the technician at the same electrostatic potential Neutralize electro static charge by touching hand and all tools on an unpainted unit surface before performing any service procedure Page 12 COOLING MODE LOW HIGH REVERSING VALVE PRESSURE PRESSURE NOTE ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW OUTDOOR COIL TO REFRIGERANE gt EXPANSION INDOOR COIL THERMOWELL 1 models EXPANSION OUTDOOR UNIT PAN INDOOR UNIT LOW HIGH 7 REVERSING PRESSURE PRESSURE VALVE NOTE ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW OUTDOOR COIL TO REFRIGERANES gt DRUM EXPANSION VALVE INDOOR COIL LIQUID LINE VALVE THERMOWELL 1 models EXPANSION OUTDOOR UNIT VALVE INDOOR FIGURE 15 Page 13 ll REFRIGERANT SYSTEM A Plumbing Field refrigerant piping consists of liquid and vapor lines from the outdoor unit sweat connections to the indoor evaporator coil sweat connections Refer to table 2 for field fabricated refrigerant line sizes Refer to Lennox Re frigerant Piping manual Corp 9351 L9 for proper size ty
33. nsibly TABLE of CONTENTS Introduction 1 CHARGING Page 16 Specifications Electrical Page 2 Leak Testing Page 16 Parts Arrangement Page 4 17 I UNIT COMPONENTS Page 7 Charging Page 18 Control Box Page 7 IV MAINTENANCE Page 20 8 V START UP Page 20 Defrost System Page 10 VI WIRING amp OPERATION SEQUENCE REFRIGERANT Page 14 ESA090P tds Page 21 Plumbing Page 14 LSAT120P E Rc Page 24 Service Valves Page 14 Thermostat Connections Page 27 Technical 1997 Lennox Industries Inc Publications Page 1 Litho U S A SPECIFICATIONS Model No LSAO90P 1 LSA120P 1 Nominal Size Tons kW 7 5 26 4 10 35 2 et face area outer coil 21 80 2 03 29 34 2 73 EE 277777 20 94 1 95 goll Tube diameter in mm amp no of rows 3 8 9 5 Diameter in mm amp no of blades 1 24 610 4 2 24 610 3 Motor hp W 1 1 2 373 2 1 3 249 Outdoor Coil Cfm L s total air volume 5300 2500 8200 3870 Fan s mw pm m Liquid line in mm connection sweat 5 8 15 9 Vapor line 0
34. op panel Lift the assembly out of the unit and disconnect the jack plug on the motor 13 Thermowell LSA 1 Models All LSA 1 model heat pumps are equipped with a thermo well figure 12 for charging the unit The well is used to ac curately measure the temperature of the liquid line The temperature is used to calculate the approach tempera ture Approach temperatures are compared to tables printed in the charging section of the manual to determine correct charge Thermowells are equipped with a gauge port for high pressure gauge connection To accurately measure the temperature of the liquid line the well should be filled with light mineral oil before using This will ensure good heat transfer to the thermometer THERMOWELL LIQUID LINE GAUGE PORT LIQUID LINE THERMOMETER WELL FIGURE 12 C Defrost System The defrost system includes four components a defrost thermostat defrost pressure switch defrost relay and de frost control Defrost Thermostat Switch Defrost thermostat switches S6 refrigeration circuit one and S124 refrigeration circuit two are S P S T con tacts which close on temperature fall initiating defrost after minimum run time of 30 60 or 90 minutes The switches are located on each of the expansion valve distributor as semblies The switches monitor the outdoor coil saturation temperature to determine when defrost is needed When the outdoor coil temperature falls to 35 F 4 F 1 7 C
35. or changes in ambient temperature which might cause thermostat droop The service light when lit indicates the compressor is not running The service light is powered from W1 2nd stage heat terminal of the indoor thermostat The service light thermostat will close and light when the discharge line falls below 110 5 F indicating a problem in the system The service light thermostat opens and the service light goes off when discharge line reaches 130 5 F indicating the compressor is running Page 11 DEFROST CONTROL BOARD COMPRESSOR CONNECTIONS DIAGNOSTIC LEDs DEFROST S INTERVAL 5 PRESSURE SWITCH SAFETY CIRCUIT CONNECTIONS AMBIENT no id THERMISTOR CONNECTION 24V TERMINAL STRIP CONNECTIONS ET z DEFROST SWITCH SERVICE LIGHT CONNECTIONS CONNECTION P i REVERSING VALVE PSDFC R O NOTE There is an internal jumper between inside PS1 and PS2 terminals FIGURE 13 ELECTROSTATIC DISCHARGE ESD TABLE 1 Precautions and Procedures ENE A CAUTION neuer mc Electrostatic discharge affect electronic compo
36. or system above the absolute zero of pressure Absolute pres sure in a vacuum is equal to atmospheric pressure mi nus vacuum pressure B Evacuating the System Evacuating the system of non condensables is critical for proper operation of the unit Non condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Non condensable such as water vapor nitrogen he 6 5 When the absolute pressure reaches 23mm of mercu lium and air combines with refrigerant to produce substances close the manifold gauge valves turn off the vacu that corrode copper piping and compressor parts um pump and disconnect the manifold gauge center 1 Connect manifold gauge set to the service valve ports port hose from vacuum pump Attach the manifold as follows low pressure gauge to vapor line service valve high pressure gauge to liquid line service valve yd Sri NOM 329 3 i regulator set to 150 psig 1034 kPa and purge the A CAUTION hose Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the man Danger of Equipment Damage ifold gauge valves Avoid deep vacuum operation Do not use com pressors to evacuate a system 6 Shut off the nitrogen cylinder and remove the manifold Extremely low vacuums can cause internal arcing gauge hose from the cylinder Open the manifold and compr
37. outdoor fan B4 N C K10 2 contacts open de energizing HR1 crankcase heater 6 Voltage passes through 541 low ambient switch switch will close provided ambient is high enough energizing K68 outdoor fan relay 2 N O K68 1 con tacts close energizing outdoor fan B5 7 Compressor contactor K1 is energized N O K1 1 contacts close energizing compressor B1 8 K8 2 N O contacts close sending 24V from G1 ener gizing indoor blower DEFROST MODE 8 During heating operation when outdoor coil drops be low 35 4 F defrost thermostats S6 circuit 1 and 5124 circuit 2 close When S6 or S124 close 4 de frost relay is energized If defrost thermostat remains closed at the end of 30 60 or 90 minutes defrost con trol energizes and defrost begins 9 When defrost control energizes reversing valve L1 and indoor heat relay are energized Outdoor fan is de energized 10 Defrost continues until 14 1 minutes have elapsed or until 546 defrost pressure switch opens When defrost pressure switch opens to terminate defrost the defrost timer loses power and resets Defrost timing is stopped until the next call for defrost when defrost thermostat closes Page 26 THERMOSTAT CONNECTIONS EAT PUMP UNIT FIELD WIRING DIAGRAM WITH AUXILIARY ECTRIC H 9 6 THERMOSTAT ee 14 1 X vm 17 17 17 ELECTRIC G Gl LSA HEAT
38. pe and application of field fabricated lines Separate dis charge and suction service ports are provided at the com pressor for connection of gauge manifold during charging procedure TABLE 2 REFRIGERANT LINE SIZES LSAP LIQUID VAPOR UNIT LINE LINE 5 8 in 1 3 8 i 5 120 5 8 1 3 8 16 35mm B Service Valves All LSA heat pumps are equipped with service valves lo cated in the liquid and vapor lines The service valves are manually operated See figures 16 17 and 18 The service ports are used for leak testing evacuating charging and checking charge 1 Liquid Line Service Valve A full service liquid line valve made by one of several manufacturers may be used All liquid line service valves function the same way differences are in construction Valves are not rebuildable If a valve has failed it must be replaced The liquid line service valve is illustrated in figure 16 A schrader valve is factory installed A service port cap is supplied to protect the schrader valve from contamination and to serve as primary leak seal LIQUID LINE SERVICE VALVE VALVE OPEN INSERT HEX WRENCH HERE INLET INDOOR COIL STEM CAP jJ SCHRADEP OUTLET COMPRESSOR CAP SERVICE PORT C LIQUID LINE SERVICE VALVE VALVE CLOSED RETAINING RING STEM CAP J SERVICE PORT INLET TO INDOOR COIL 24 SERVICE IM
39. pproach temperature equals the liquid line temperature minus the outdoor ambient temperature 2 Theapproach temperature should match values giv en in table 5 An approach temperature greater than the value shown indicates an undercharge An ap proach temperature less than the value shown indi cates an overcharge 3 Donotusetheapproach method if system pres sures do not match the pressures given in table 6 The approach methodis not valid for grossly over or undercharged systems TABLE 5 MODEL NO LIQUID TEMP MINUS AMBIENT TEMP LSA090P 1 16 F 1 8 9 C 0 5 LSA120P 1 1 5 5 0 5 9 2 1 5 0 C 0 5 11 3 1 6 0 C 0 5 LSA090P 2 LSA0120P 2 Note For best results the same thermometer should be used to check both outdoor ambient and liquid temperatures D Oil Charge Refer to compressor nameplate Page 18 TABLE 6 Normal Operating Pressures Outdoor Coil LSAO90P 1 8 090 1 LSA120P 1 LSA120P 1 Entering Air Liquid Vapor Liquid Vapor Temperature 10 psig 5 psig 10 psig 5 psig 55 18 757 28 C 208 LSA090P tested with CB17 CBH17 95V LSA120P tested with CB17 CBH17 135V TABLE 7 Normal Operating Pressures Outdoor Coil LSA090P 2 LSA090P 2 LSA120P 2 LSA120P 2 Entering Air Discharge Vapor Discharge Vapor Temperature 10 psig 5 psig 10 psig 5 psig raro m LSA090P tested with CB17 CBH17 95V L
40. provided 5 minute time delay is sat isfied Voltage passes through N C K8 1 to CMCI defrost control K6 set coil is enegized K6 1 latching relay contacts close energizing L1 reversing valve K58 low ambient relay is energized N C K58 1 con tacts open eliminating S11 by pass Voltage passes through S11 low pressure switch switch will close provided liquid line pressure rises to 275 10 psig energizing outdoor fan relay K10 N O K10 1 contacts close energizing outdoor fan B4 N C K10 2 contacts open de energizing HR1 crankcase heater Compressor contactor K1 is energized N O K1 1 contacts close energizing compressor B1 G from indoor thermostat sends 24V through K8 2 N C contacts to G1 energizing indoor blower HEATING Heating demand energizes through terminal W1 at the indoor thermostat provided 5 minute time delay is sat isfied Page 23 2 K8 transfer relay is energized K8 1 contacts open and N O contacts close sending voltage to defrost control K6 re set coil is energized 3 K6 1 latching relay contacts open de energizing L1 reversing valve 4 K58 low ambient relay is de energized N C K58 1 contacts close by passing S11 low ambient switch 5 K10 outdoor fan relay is energized N O K10 1 con tacts close energizing outdoor fan B4 N C K10 2 contacts open de energizing HR1 crankcase heater 6 Compressor contactor K1 is energized N O K1 1 cont
41. r unit 6 After a short period of time open a refrigerant port to make sure the refrigerant added is adequate to be de tected Amounts of refrigerant will vary with line lengths Check all joints for leaks Purge nitrogen and HCFC 22 mixture Correct any leaks and recheck 7 f brazing is necessary for repair bleed enough nitrogen through the system to ensure all oxygen is displaced Brazing with oxygen in the system will create copper ox ides which may cause restrictions the failure of compo nents and will effect the dielectric of refrigerant oil causing premature compressor failure N TABLE 4 2 MODELS UNIT MODEL MATCHED HCFC 22 FOR 25 FEET LIQUID LINE ADJUSTMENT PER NUMBER INDOOR UNIT 7 6 m OF LINE DIAMETER FOOT 3 m OF LINE LSA120P 2 5 8 in 16 mm 1 8 oz 51g LSA090P 2 CB17 CBH17 95 23 Ibs 10 4 kg 3 4 19 2 6 oz 74g 5 8 in 16 1 8 oz 514 CB17 CBH17 135 31 Ibs 14 1 kg 3 4 in 19 mm 2 6 oz 749 If line length is greater than 25 feet 7 62 add this amount If line length is less than 25 feet 7 62 m subtract this amount NOTE Refrigerant line sets should not be longer than 100 feet 30 5 m Refrigerant line losses deduct from the net capac ity of the system Additional refrigerant required for such systems may also upset the refrigerant to oil ratio Page 16 NOTE The term absolute pressure means the total actual pressure within a given volume
42. s energized and defrost begins The defrost cycle is terminated by the defrost pressure switch or in 14 minutes whichever occurs first Defrost Control Components 1 Defrost Control Timing Pins Each timing pin selection provides a different accumu lated compressor run period during one thermostat run cycle This time period must occur before a defrost cycle is initiated The defrost interval can be adjusted to 30 60 or 90 minutes See figure 13 If no timing is selected the control defaults to the factory setting 90 minutes The de frost period is a maximum of 14 minutes and cannot be adjusted A TEST option is provided for troubleshooting When the jumper is placed across the TEST pins the timing of all functions is reduced by a factor of 128 For example a 90 minute interval during TEST is 42 seconds and the 14 min ute defrost is reduced to 6 5 seconds The TEST mode may be started at anytime If the jumper is in the TEST position at power up or for longer than five min utes the control will ignore the TEST selection and will de fault to a 90 minute interval In order to test defrost cycle defrost thermostat must be closed or jumpered Once defrost is initiated remove jumper immediately Failure to remove jumper will reduce defrost time to seconds 2 Time Delay The timed off delay is five minutes long The delay feature is provided to help protect the compressor in case of inter ruption in power to the unit before thermost
43. th two service ports See figure 17 A service port cap is supplied to seal off the port A schrader valve is factory installed A service port cap is supplied to protect the schrader valve from contamination and to serve as primary leak seal LSA 2 model heatpumps are equipped with a full service ball valve shown in figure 18 The valve has one service port that contains a schrader valve core A cap is provided to seal off the port and prevent contamination Different manufacturers of valves may be used All vapor line service valves function the same way differences are in construction If a valve fails it must be replaced To Access Service Port 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then tighten an additional 1 6 turn To Open Vapor Line Service Valve 1 Remove stem cap with an adjustable wrench 2 For 1 models use a service wrench and back the stem out counterclockwise until stem just touches the retain ing ring For 2 models back the stem out counterclock wise for a 1 4 turn 3 Replace stem cap and finger tighten then tighten an additional 1 6 turn To Close Vapor Line Service Valve 1 Remove stem cap with an adjustable wrench 2 For 1 models turn stem in clockwise to seat the valve Tighten firmly For 2 models turn stem in clockwise for 1 4 tum 3 Replace stem cap Tighte
44. the outer crescent shaped gas pocket created by the two scrolls figure 10 2 The centrifugal action of the orbiting scroll seals off the flanks of the scrolls figure 10 3 As the orbiting motion continues the gas is forced toward the cen ter of the scroll and the gas pocket becomes compressed figure 10 4 When compressed gas reaches the center it is discharged vertically into a chamber and discharge port in the top of the compressor figure 8 The discharge pressure forcing down on the top scroll helps seal the upper and lower edges tips of the scrolls figure 11 During a single orbit several pockets of gas are compressed simultaneously providing smooth continuous compression CROSS SECTION OF SCROLLS DISCHARGE DISCHARG STATIONARY SCROLL PRESSURE wr SRS N SS 4 NNN HH 5 57 5 5 8 N 9 AUN Wat 7 po 2 OCA NG d di 1222222222222 TIPS SEALED BY DISCHARGE PRESSURE ORBITING SCROLL FIGURE 11 3 Crankcase Heaters HR1 all units All LSA heat pumps use a belly band crankcase heater Heater HR1 is wrapped around compressor B1 HR1 as sures proper compressor lubrication at all times 4 High Pressure Switch S4 all units The high pressure switch is an automatic reset SPST N C switch which opens on a pressure rise The switch is lo cated on the compressor discharge line and is wired to the defrost control board CMC1
45. the normally closed contacts remain closed and the unit remains in the heating mode Page 7 6 Transfer Relay K8 all units Transfer relay K8 ensures that the indoor blower will oper ate during all modes of operation K8 also completes the circuit to Y1 on the defrost control board CMC1 The com bined operation of latch relay K6 and transfer relay K8 al lows the LSA unit to use a conventional heat cool thermo stat instead of a heat pump thermostat When there is a de mand for cooling K8 1 closes completing the Y 1 circuit to defrost control board CMC1 terminal Y1 Normally open K6 1 closes energizing the reversing valve K8 2 normaly closed contacts ensure an unbroken circuit between in door thermostat G and indoor blower contactor through terminals G and G1 on terminal strip TB14 When there is a heat demand normally closed K8 1 opens breaking the Y1 circuit to the defrost control CMC1 Power is sent to the RESET coil on K6 K6 1 opens de energizing the re versing valve K8 2 closes sending voltage from G1 to the indoor blower control 7 Outdoor Fan Relay K10 all units K68 120P Outdoor fan relay K10 is a DPDT relay and K68 is a SPDT relay with a 24V coil In all units K10 energizes outdoor fan B4 fan 1 in response to thermostat demand In the LSA120P K68 energizes outdoor fan B5 fan 2 in re sponse to thermostat demand 8 Terminal Strip TB14 all units 14 terminal strip distributes 24V power fro
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