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CBX32MV Series - HvacPartsShop.com

1. 1 2 MIN 50 CFM COOLING DEMAND IIl VARIABLE SPEED MOTOR TROUBLESHOOTING DO e Check motor controls wiring and connections thoroughly before replacing e Use proper replacement parts for motor and control model numbers e Keep duct static to a minimum e Size equipment properly Check orientation before inserting motor connector DON T e Automatically assume the motor is bad e Locate connectors above 7 and 4 o clock positions e Replace a control or motor number with an unauthorized replacement e Use high pressure drop filters e Use restricted returns e Oversize systems then compensate with low airflow MOISTURE CHECK e Connectors should point downward e Arrange harness with drip loop under motor e Check condensate drain plug e Check for airflow too much latent capacity e Check for undercharged condition e Check for plug leaks in return ducts cabinet Page 13 MOTOR CHECK Reduced blower speed for production August 2002 and later Kit 70J11 can be used to check the motor The kit is is 7096 of COOL speed for ALL model units Reduced blower available at the Lennox parts center If not using the kit speed for production prior to August 2002 is 6596 of COOL for follow the procedure below These settings and jumper the 036 units and 60 of COOL for 048 and 060 series placements will bypass the BDC3 control board and units confirm correct motor operation COOL SPEED Symptom Caus
2. 50 50 50 ECB29 30CB 1 P 60 60 60 208 230 Volt Electric Heat Sections ECB29 15CB 1 Y 60 AMP Each stage of the 208 230 electric heat is protected ECB29 20CB 1 40 AMP 35 AMP a by a primary S15 and secondary S20 high ECB29 25CB 1 Y 50 35 AMP temperature limit Both S15 and S20 are located in the Note Do not remove patch plate or insulation on units same housing Each stage uses the same style of limits Both the primary and secondary limits are wired in series without circuit breakers with a heat element When either S15 or S20 opens the 4 Terminal Strip TB2 208 230 volt only corresponding heat element is de energized All other heating elements remain energized The primary high temperature limit opens at 150 F 5 F 65 5 C 2 8 C on a temperature rise and automatically resets at 110 F PF 43 3 C 5 0 C on a temperature fall The secondary high temperature limit opens at 333 F 10 F 167 2 C 5 6 C on a temperature For the electric heat sections without circuit breakers or fuses line voltage connections are made to terminal strip TB2 The terminal strip is located in the lower left corner of the electric heat vestibule panel Single phase electric heat uses two pole terminal strips while three phase electric heat uses three pole terminal strips rise lf the secondary limit opens it must b
3. LENNOX Service Literature UNIT INFORMATION CBX32MV Corp 0206 L3 Revised 02 2010 CBX32MV HFC 410A SERIES UNITS TABLE OF CONTENTS Introduction 1 Model Number Identification 2 Specifications Electrical Data 2 Blower Performance 4 Parts Arrangement 10 l Application 11 Il Unit Components 11 Ill Troubleshooting the Variable Speed Motor 15 IV Optional Electric 17 V Optional Humidity Control 23 Vl Configuration Modifications 30 VII Start Up Operation 34 VIIl Operating Characteristics 35 XI Maintenance 35 X Wiring and Operation Sequence 36 Introduction The CBX32MV is a high efficiency residential split system blower coil featuring a variable speed motor controlled by an electronic blower drive control BDC CBX32MV series units are designed to be matched with Lennox two speed or single speed HFC 410A condensing units and heat pumps Several models are available in sizes ranging from 1 5 through 5 tons All units are equipped with factory installed check and expansion valve for cooling or heat pump applications Electric heat is available in
4. When K33 1 K35 1 and K35 2 contacts close assuming the N C primary S15 and secondary S20 limit switches are closed electric heat elements HE4 HE5 and HE6 are energized Page 40
5. ELECTRICAL DATA Voltage phase 60hz 208 230V 1ph 208 230V 1ph 208 230V 1ph Maximum overcurrent protection unit only 20 20 20 Minimum circuit ampacity unit only 11 11 11 Optional CIRCUIT BREAKER KITS Must Be Ordered Extra D 2 gt I II Page 3 Blower Data CBX32MV 018 024 BLOWER PERFORMANCE 0 through 0 80 in w g 0 through 200 Pa External Static Pressure Range BDC3 Jumper Speed Positions HEAT Speed COOL Speed ADJUST Jumper Setting 1000 470 1130 535 900 425 1035 490 800 375 930 440 NOTES The effect of static pressure filter and electric heater resistance is included in the air volumes listed Low speed cooling air volume is 70 of COOL speed setting Production units September 2005 and later continuous blower speed for is approximately 38 of COOL speed setting Earlier production units continuous blower speed is approximately 50 of COOL speed setting Harmony Zone Control applications Low speed cooling is approximately 250 cfm 118 L s Lennox Harmony 1 Zone Control applications Low speed cooling is 300 cfm 145 L s CBX32MV 018 024 BLOWER MOTOR WATTS AT Plus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Motor Watts Various External Static Pressures in wg Pa Speed Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 HEAT Speed COOL Speed 0 7 175 0 8 200 BDC3 Jumper Motor W
6. HEAT Speed Tap 1 65 90 120 145 185 210 240 250 275 Tap 2 95 125 150 185 230 265 310 345 365 Tap 3 140 190 225 250 290 320 350 405 450 Tap 4 215 250 285 315 350 390 440 480 505 COOL Speed Tap 1 45 60 90 120 140 155 165 185 200 Tap 2 80 110 135 165 205 250 285 315 335 Tap 3 150 195 225 260 295 320 370 425 465 Tap 4 265 315 350 400 440 485 525 555 605 CBX32MV 024 030 BLOWER MOTOR WATTS AT NORM BDC3 SETTING Adjust Jumper at NORM Setting BDC3 Jumper Motor Watts Various External Static Pressures in wg Pa Speed Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed Tap 1 Tap 2 Tap 3 Tap 4 COOL Speed CBX32MV 024 030 BLOWER MOTOR WATTS AT Minus BDC3 SETTING Adjust Jumper at Setting Motor Watts Various External Static Pressures in wg Pa Speed Positions 0 1 25 02 5 03 75 0 4 100 0 5 125 0 6 150 0 7 475 0 8 200 HEAT Speed Tap 1 45 65 90 110 130 150 165 190 195 Tap 2 60 85 110 145 175 200 215 235 240 Tap 3 85 105 130 165 210 245 280 305 330 Tap 4 115 145 175 205 230 280 325 370 390 COOL Speed Tap 1 30 50 70 90 100 115 125 140 165 Tap 2 55 75 100 135 155 185 190 210 225 Tap 3 85 115 135 175 210 255 295 320 345 Tap 4 145 175 215 245 280 325 355 410 450 Page 5 CBX32MV 036 BLOWER PERFORMANCE 0 through 0 80 in w g 0 through 200 Pa External Static Pressure Range
7. ECB29 8 28K33 Terminal Block ECB29 8CB 28K34 45A Circuit breaker ECB29 9CB 10L11 50A Circuit breaker ECB29EH 9CB 91K67 50A Circuit breaker ECB29 12 5CB 28K37 1 25A amp 1 50A Circuit breaker ECB29EH 12 5CB 91K68 1 25A amp 1 50A Circuit breaker ECB29 15CB 28K38 1 30A amp 1 60A Circuit breaker ECB29EH 15CB 91K69 1 30A 8 1 60A Circuit breaker ECB29 20CB 11L31 1 50A amp 1 60A Circuit breaker ECB29EH 20CB 91K70 1 50A amp 1 60A Circuit breaker ECB29 25CB 28K40 3 50A Breakers THREE PHASE ELECTRIC HEAT ECB29 8 28K42 Terminal block ECB29 10 28K43 Terminal block ECB29 15CB 28K44 50A Circuit breaker ECB29 20CB 28K45 2 35A Circuit breakers ECB29 25CB 28K46 2 45A Circuit breakers NOTE Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps 1 Electric heater capacity only does not include additional blower motor heat capacity 2 Amps shown are for blower motor only 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C 4 Bold text indicates that the circuit breaker on CB circuit breaker models must be replaced with size noted 5 HACR type circuit breaker or fuse Page 18 ECB29 5 5CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT VESTIBULE PANEL ELE
8. 28K34 45A Circuit breaker ECB29 9CB 10L11 50A Circuit breaker ECB29EH 9CB 91K67 50A Circuit breaker ECB29 10 28K35 Terminal Block ECB29 10CB 28K36 60A Circuit breaker ECB29 12 5CB 28K37 1 25A amp 1 50A Circuitbreaker ECB29EH 12 5CB 91K68 1 25A amp 1 50A Circuitbreaker ECB29 15CB 28K38 1 30A amp 1 60A Circuit breaker ECB29EH 15CB 91K69 1 30A amp 1 60A Circuit breaker NOTE Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps 1 Electric heater capacity only does not include additional blower motor heat capacity 2 Amps shown are for blower motor only 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C 4 Bold text indicates that the circuit breaker on CB circuit breaker models must be replaced with size noted 5 HACR type circuit breaker or fuse Page 16 TABLE 5 ELECTRIC HEAT DATA SINGLE PHASE ELECTRIC HEAT Model Number Input Input 2 Blower Motor Full Load Amps CBX32MV 036 3 Minimum Circuit Ampacity Circuit Circuit 5 Maximum Overcurrent Protection ECB29 5 28K31 Terminal Block ECB29 5CB 28K32 30A Circuit breaker ECB29 6 47L22 Terminal Block ECB29 6CB 47L23 35A Circuit breaker ECB29 8 28K33 Terminal Block ECB29 8CB 28K34 45A Circuit breaker ECB299CB 10L11 50A Circuit breaker
9. BDC3 Jumper Speed Positions HEAT Speed COOL Speed ADJUST Jumper Setting NOTES The effect of static pressure filter and electric heater resistance is included in the air volumes listed Low speed cooling air volume is 70 of COOL speed setting 65 COOL speed for production prior to August 2002 Production units September 2005 and later continuous blower speed for is approximately 38 of COOL speed setting Earlier production units continuous blower speed is approximately 50 of COOL speed setting Harmony Zone Control applications Low speed cooling is approximately 380 cfm 178 L s Lennox Harmony III Zone Control applications minimum blower speed is 442 cfm 210 L s CBX32MV 036 BLOWER MOTOR WATTS AT Plus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Motor Watts Various External Static Pressures in wg Pa Speed Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed COOL Speed CBX32MV 036 BLOWER MOTOR WATTS AT NORM BDC3 SETTING Adjust Jumper at NORM Setting BDC3 Jumper Motor Watts Various External Static Pressures in wg Pa Speed Positions 0 0 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed COOL Speed CBX32MV 036 BLOWER MOTOR WATTS AT Minus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Motor Watts Var
10. Diagnostic LEDs RUN RUN indicates there is a demand for the blower motor to run CFM CFM LED indicates the CFM the unit is operating according to the jumper settings The light flashes once for approximately every 100 CFM For example if the unit is operating at 1000 CFM CFM LED will flash 10 times If the CFM is 1150 CFM LED will flash 11 full times plus one fast or half flash At times the light may appear to flicker or glow This takes place when the control is communicating with the motor between cycles This is normal operation The appropriate speed according to application and CFM need is selected by moving jumper pins Jumper Settings 4 IMPORTANT Before changing jumper setting make sure the motor has completely stopped Any jumper set ting change will not take place while the motor is running Table 2 shows the recommended factorv blower speed tap selections for CBX32MV series units These settings are for nominal tonnage match ups with the CBX32MV When matched with other sizes it is recommended that the CFM be adjusted to approximatelv 400 CFM per ton TABLE 2 FACTORV BLOWER SPEED TAP SELECTION SPEED TAP SELECTION COOL HEAT 2 Heat Condensing Unit Heat Pump Pum with Electric Heat with Electric Only Heat 018 024 024 030 048 060 Minimum setting for heat To change jumper positions gently pull the jumper off the pins and place it on the de
11. ECB29EH 9CB 91K67 50A Circuit breaker ECB29 12 5CB 28K37 1 25A amp 1 50A Circuitbreaker ECB29EH 12 5CB 91K68 1 25A amp 1 50A Circuitbreaker ECB29 15CB 28K38 1 30A amp 1 60A Circuit breaker ECB29EH 15CB 91K69 1 30A amp 1 60A Circuit breaker ECB29 20CB 11L31 1 50A amp 1 60A Circuit breaker ECB29EH 20CB 91K70 1 50A amp 1 60A Circuit breaker THREE PHASE ELECTRIC HEAT ECB29 8 28K42 Terminal Block 4 3 4 3 4 3 4 3 ECB29 10 28K43 Terminal Block ECB29 15CB 28K44 50A Circuit breaker ECB29 20CB 28K45 2 35A Circuit breaker NOTE Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps 1 Electric heater capacity only does not include additional blower motor heat capacity 2 Amps shown are for blower motor only 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C 4 Bold text indicates that the circuit breaker on CB circuit breaker models must be replaced with size noted 5 HACR type circuit breaker or fuse Page 17 TABLE 6 ELECTRIC HEAT DATA CBX32MV 048 CBX32MV 060 and CBX32MV 068 3 Minimum 5 Maximum Circuit Ampacity Overcurrent Protection Model Number ECB29 5 28K31 Terminal Block ECB29 5CB 28K32 30A Circuit breaker ECB29 6 47L22 Terminal Block ECB29 6CB 47L23 35A Circuit breaker
12. 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed COOL Tap 1 180 205 240 285 325 365 405 435 480 pee Tap 2 250 285 320 355 410 455 505 535 585 Tap 3 345 375 415 460 505 560 610 670 735 Tap 4 445 510 560 595 665 725 790 845 865 CBX32MV 068 BLOWER MOTOR WATTS AT Minus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed COOL Speed Page 8 Parts Arrangement ELECTRIC HEAT SECTION CBX32MV CONTROL BOX BLOWER COMPARTMENT BLOWER ACCESS PANEL HORIZONTAL DRAIN PAN COIL COIL ACCESS PANEL CHECK AND EXPANSION VALVE COMPLETE WITH SCREEN UPFLOW DOWNFLOW DRAIN PAN FIGURE 1 CBX32MV CONTROL BOX LARGE ELECTRIC HEAT ADDITIONAL KNOCK SMALL ELECTRIC HEAT OUT EOR BLOWER TERMINAL KNOCK OUT FOR RELAY K20 STRIP 1 2 5 15 kW TRANSFORMER BDC3 BLOWER CONTROL A15 TERMINAL STRIP GROUNDING TB2 LUGS FIGURE 2 Page 9 I APPLICATION CBX32MV blower coils are designed for R410A applications only All major
13. 2 minutes C Motor runs at 100 until demand is satisfied D Once demand is met motor runs at 50 for 1 2 minute then E Motor ramps down to off 7 1 2 100 82 1 2 50 COOLING DEMAND CBX32MV units built Februarv 2003 and later 1 Pins Jumpered A Motor runs at 100 until demand is satisfied B Once demand is met motor ramps down to stop OFF 100 CFM OFF n 2 Pins Jumpered A Motor runs at 100 until demand is satisfied B Once demand is met motor runs at 100 for 45 seconds C Motor ramps down to stop A B 100 gt 100 CFM OFF F 45 seconds OFF COOLING DEMAND CB32XMV units date coded prior to 2 2006 will delay 60 seconds 3 Pins Jumpered A Motor runs at 8296 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1 2 minutes B Motor runs at 10096 until demand is satisfied C Once demand is met motor ramps down to stop B 7 1 2 82 COOLING DEMAND 100 OFF OFF A Pins Jumpered A Motor runs at 50 for 30 seconds B Motor then runs at 82 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1 2 minutes C Motor runs at 100 until demand is satisfied D Once demand is met motor runs at 50 for 30 seconds E Motor ramps down to stop 7 1 2 82 100
14. 24VAC energized Page 38 COMPONENT ARRANGEMENT OR TB2 L2 DESCRIPTION COMPONENT CIRCUIT BREAKER ELECTRIC HEAT ELEMENT ELECTRIC HEAT PLUG ELECTRIC HEAT RELAV SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT CONNECT POWER WIRES FROM ISWITCH LIMIT PRIMARY AUTO RESET INHEATER LABLED LI L2 L3 SWITCH LIMIT SECONDARY TO TB2 TERMINAL STRIP TERMINAL BLOCK ELECTRIC HEAT INSIDE INDOOR UNIT A LINE VOLTAGE FIELD INSTALLED ZA TB2 LT CIRCUIT DENOTES OPTIONAL COMPONENTS L 7 5 LI LI v L2 L2 2 L3 Y L3 i NI Aq u a bG 6 29 5 1 ES A G A 515 515 REFER TO UNIT PX CIRCUIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND S20 520 L2 MAXIMUM OVER 18 PROTECTION SIZE EQUIPMENT GROUND ORE 2 Q2 m T HES USE 60 BREAKER ON 29 15 UNITS NOTE USE COPPER CONDUCTORS ONLY FOR COMPLETE CIRCUIT USE DIAGRAM FOR THE n 11 95 v E6B29 5 8 8 10 1Y LENNOX me WIRING DIAGRAM 22 A 182 USED ON HEATING UNITS ELECTRIC HEATERS ONLY A CB USED ON ECB29 5 8 10 1 Y 5KW HEATER ONLY ECB29 BCB Y AN Re MEN mena Supersedes Form No New Form No U NIT 551 706W 1995 Lennox Indust
15. 5 When K33 1 K33 2 close assuming the 3 Assuming the N C primarv S15 and secondarv S20 primarv S15 and secondarv S20 limit switches limit switches are closed electric heat element HE1 is are closed electric heat elements HE2 and HE3 are energized energized Page 37 COMPONENT ARRANGEMENT CaO Y CB2 CB3 9 joo 2 OO loo DESCRIPTION COMPONENT CIRCUIT BREAKERS KW AMPS CIRCUIT BREAKER ELECTRIC HEAT CIRCUIT BREAKER ELECTRIC HEAT 25KW 50A CIRCUIT BREAKER ELECTRIC HEAT 30KW 60A ELEMENT ELECTRIC HEAT ELEMENT ELECTRIC HEAT ELEMENT ELECTRIC HEAT PLUG ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT B NOTE USE COPPER RELAY SEQUENCER ELECTRIC HEAT CONDUCTORS ONLY 2 RELAY SEQUENCER ELECTRIC HEAT 2 RELAY SEQUENCER ELECTRIC HEAT LINE VOLTAGE FIELD INSTALLED E RITE LIMIT n RU RAS mesa DENOTES OPTIONAL COMPONENTS SWITCH LIMIT SECONDARY CIRCUIT 3 CIRCUIT 2 A CIRCUIT lL18Z N 2 CBI EQUIPMENT 7 EQUIPMENT GROUND GROUND EN REFER TO UNIT LENNOX S me WIRING DIAGRAM NAMEPLATE FOR MINIMUM CIRCUIT HEATING UNITS ELECTRIC MAXIMUM OVER PROTECTION SIZE ECB29 25CB 30CB I P Supersedes Form No New Form No 01995 Lennox
16. CBX32MV unit may be installed in the upflow downflow horizontal right hand discharge or horizontal left hand discharge orientation The units come from the factory ready for upflow or horizontal right hand discharge installation If the unit needs to be modified from its original configuration use the following procedures All procedures assume the unit has not been modified from the factory A Disassembly of CBX32MV Cabinet For tight applications where a modular design is an advantage the CBX32MV unit can be easily disassembled and reassembled By removing four screws the top blower section lifts off so the unit is in two parts To disassemble the CBX32MV use the following procedure 1 Remove the two black screws located just above the seam in the top half of the unit 2 Remove the front access panel and remove the two screws on the inside of the top half of the cabinet on both sides 3 Lift the top section apart from the bottom section 4 To lighten the cabinet for lifting the blower and coil assemblies can also be removed 5 Reassemble once the cabinet is in place B Upflow Application 1 Discard drip shields if applicable The shields are used for downflow applications only and are located with the foam pads on top of unit 2 For best efficiency and air flow the horizontal drain pan should be removed from units in upflow configurations 3 After removing horizontal drain pan place unit in desired locati
17. HE3 CIRCUIT BREAKER PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 ELECTRIC HEAT SEQUENCER RELAY K32 ELECTRIC HEAT SEQUENCER RELAY K35 ELECTRIC HEAT SEQUENCER RELAY K34 ELECTRIC HEAT SEQUENCER RELAY K116 FIGURE 10 Page 20 V OPTIONAL HUMIDITV CONTROL A20 EfficiencvPlus PARTS IDENTIFICATION lt BASE SECTION CONTROL WIRE ENTRV TERMINAL BLOCK ar INDICATING LIGHTS HUMIDITY SENSOR ON CIRCUIT BOARD Lose COVER VERTICAL SLIDE CONTROL control setpoint NOTE TO REMOVE COVER HOLD BASE SECTION AND GENTLY PULL THE COVER OUT AT THE BOT TOM AND PIVOT IT UP AND AWAY FROM BASE FIGURE 11 A CCB1 Optional Comfort Control Board CCB1 A20 may be installed adjacent to the indoor thermostat figure 11 The control monitors indoor humidity conditions and creates a dehumidification demand in response to indoor humidity just as the thermostat creates a cooling demand in response to indoor temperature The CCB1 works in combination with the indoor thermostat to adjust compressor speed and indoor blower speed Although the control provides a dehumidification demand only the thermostat can directly control compressor operation The CCB1 cannot call for a compressor cycle by itself Principles of Cooling with Drier Air The humidity comfort range for humans is between 4096 and 60 relative humidity RH A vertical slide on the control allows the humidity
18. Industries Inc F ECB29 25CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 5 When K33 1 closes the blower if not energized is 1 When there is a call for heat W1 of the thermostat energized on heating speed and economizer heat relay energizes the electric heat relays K32 and K34 with K43 is energized see 208 230VAC CB schematic 24VAC 6 When K33 2 and K116 1 close assuming the N C 2 When K32 1 closes the blower is energized on primary S15 and secondary S20 limit switches heating speed and economizer heat relay K20 2 is are closed electric heat elements HE3 and HE6 are energized see unit schematic 26 energized 3 When K32 1 and K32 2 closes assuming the N C THIRD STAGE HEAT primary S15 and secondary S20 limit switches remove jumper between W3 and R if using third stage arg closed electric heat elements HE1 and HE2 are 7 When K34 2 closes the unit is ready for a third stage heat energized demand W3 if available of the thermostat sends a third SECOND STAGE HEAT stage heat demand energizing the electric heat relav K35 remove jumper between W2 and R with 24VAC 4 When K34 1 closes the unit is readv for a second stage 8 When K35 1 and K35 2 close assuming the N C heat demand W2 of the thermostat sends a second stage primary S15 and secondary S20 limit switches heat demand energizing the electric heat relays K33 and are closed electric heat elements HE4 and HES are K116 with
19. P ELECTRIC HEATERS THE NUMBER OF CIRCUITS VARY ACCORDING TO HEATER MODEL REFER TO FAN COIL NAMEPLATE FOR ACTUAL NUMBER EMPLOYED 24V POWER COOL HEAT 2 REV VALVE COOL HEAT 1 REFER TO FACTORV BLOWER SPEED TAP SELECTION CHART BELOW FOR BLOWER SPEED INFORMATION USE COPPER CONDUCTORS ONLV REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITV AND MAXIMUM OVERCURRENT PROTECTION SIZE NOTE FOR NON HEAT PUMP APPLICATION ONLV WHEN TWO STAGE THERMOSTAT IS USED CONNECT SECOND STAGE HEAT BULB TO TERMINAL W2 AND REMOVE JUMPER BETWEEN TERMINALS R amp W2 JUMPER R TO O IS USED WITH CONDENSING UNIT REMOVE TO 707 JUMPER WHEN HEAT PUMP IS USED REMOVE JUMPER BETWEEN DS AND YI WHEN HUMIDITY CONTROL CCBI A20 IS USED JUMPER YI TO va IS FOR SINGLE STAGE COOLING REMOVE JUMPER YI TO Y2 FOR TWO STAGE COOLING INTO 246 15 TO J46 13 TO J46 5 TO TBI YI TO J46 11 TO 0 oro LENNIXe coiLs BLOWER COIL UNITS CBX32MV 024 030 048 060 230 2 CBX32MV 018 024 068 2 CBX32MV 036 230 3 Supersedes New Form INDICATES OPTIONAL COMPONENTS LINE VOLTAGE FIELD WIRING 334 698W CLASS II VOLTAGE FIELD WIRING 2004 Lennox Industries Inc Litho U S A A CBX32MV 208 230V SINGLE PHASE SEQUENCE OF OPERATION 1 Line voltage is routed to transformer T1 and blower motor B3 2 T1 supplies 24VAC to terminal strip TB1 which supplies 24VAC to the indoor thermostat and e
20. Y1 Acceptable None Low 40 of COOL Y2 Y1 Acceptable None Acceptable None High COOL 40 of COOL Call for humidity re moval during 1st stage thermostat Y1 Change to Slightly over setpoint 1 40 of COOL demand Demand Satisfied Slightly over setpoint 1 Off Significant increase Y1 Slightly over setpoint 1 Acceptable None 60 65 70 40 of COOL in humiditv during thermostat demand Change to Significantly over setpoint 2 or more Over Setpoint 60 65 70 of COOL 60 65 70 of COOL Humiditv demand satisfied during Change to Acceptable None COOL thermostat demand Acceptable None Off Call for humiditv re Acceptable None Acceptable None 40 of COOL COOL moval during 2nd stage thermostat de Change to Slightly over setpoint 1 60 65 70 of COOL mand Call for 1st stage Acceptable None Slightly over setpoint 1 COOL Off cooling after call for humiditv removal Call for 2nd stage Slightiv over setpoint 1 Slightiv over setpoint 1 40 of COOL Off cooling after call for humidity removal Call for cooling after Slightly over setpoint 1 Significantly over setpoint 2 or more 60 65 70 of COOL Off significant increase in humidity Humidity demand sat isfied between thermo Significantly o
21. and must be plugged when the unit is configured for left hand air discharge see page 24 for horizontal left hand application Each pan has a set of connections one for a primary drain and one for an auxiliary drain G Coil All CBX32MV series units have dual slab coils arranged in an A configuration Each coil has two or three rows of copper tubes fitted with ripple edge aluminum fins A check and expansion valve complete with screen feeds multiple parallel circuits through the coils The coil is designed to easily slide out of the unit cabinet Optional electric heating elements are sequenced so blower relay K20 operates on a first on last off basis H Variable Speed Blower Motor B3 CBX32MV series units use a single phase variable speed motor See figure 4 A solid state controller is attached to the motor Page 10 CBX32MV MOTOR BLOWER HOUSING ARROW MUST MOTOR CONTROLLER CBX32MV BLOWER MOTOR COMPONENTS STATOR WINDINGS BEARING OUTPUT p SHAFT FIGURE 4 l BDC3 Blower Control Board A15 CFM on the CBX32MV unit is controlled bv the BDC3 board A15 located in the control box CFM can be obtained bv positioning jumpers COOL HEAT and ADJUST on the BDC3 board The jumpers are labeled 1 2 3 and 4 Each enables a different air volume Diagnostic LEDs are provided as aid in identifying the units mode of operation The LEDs are labeled RUN and CFM See figure 5 BLOWER SPEED ADJUSTMENTS
22. blower coil components must be matched according to Lennox recommendations for the unit to be covered under warranty Refer to the Engineering Handbook for approved system matchups A misapplied system will cause erratic operation and can result in early unit failure The units come with factory installed check and expansion valve for all applications It has been installed internally and is accessible if required II UNIT COMPONENTS A Control Box The CBX32MV control box is shown in figure 2 Line voltage and electric heat connections are made in the control box Optional electric heat fits through an opening located in the center of the control box When electric heat is not used knockout plates cover the opening The electric heat control arrangement is detailed in the electric heat section of this manual B Terminal Strips TB1 and TB2 All CBX32MV units are equipped with two low voltage terminal strips TB1 and TB2 located in the control box See figure 2 The strips are used for making up all indoor thermostat wires Al CBX32MV units have factory installed jumpers connecting DS to Y1 R to O and Y1 to Y2 These jumpers will have to be removed in certain unit application See table 1 TABLE 1 Harmony II CCB1 SignatureStat Doo Heat Pump RtoO Two Stage Cooling Y1 to Y2 C Transformer T1 All CBX32MV series units use a single line voltage to 24VAC transformer mounted in the control box The transformer supplies
23. different CFM volumes For example during a first stage cooling call two speed outdoor unit with no demand from the CCB1 the air volume is 4096 of the COOL jumper selection For a normal COOL Pin 2 setting for CBX32MV 036 the CFM is 1125 the reduced speed is 450 CFM 1125 x 40 450 This arrangement provides for additional dehumidification during first stage cooling See tables 10 and 11 for various scenarios concerning use of the CCB1 humidity control and the CBX32MV series unit B SignatureStat or ComfortSense 7000 The reference thermostats can be installed in place of the indoor thermostat The thermostat monitors indoor humidity conditions and creates a dehumidification demand in response to indoor humidity just as it creates a cooling demand in response to indoor temperature The SignatureStat adjusts compressor speed and indoor blower speed to maintain humidity at a comfortable level Principles of Cooling with Drier Air The humidity comfort range for humans is between 4096 and 60 relative humidity RH 50 RH is the recommended initial setpoint until personal comfort level is established The personal comfort level will vary with humidity as with temperature For example if air at 75 F and 5096 RH is changed to 6096 RH the air will feel much warmer Likewise if the air is reduced to 4096 RH it will feel much cooler Even when inactive the body evaporates a large amount of moisture away from the skin
24. power to the control circuits in the indoor and outdoor unit D Blower Relay K20 All units use SPDT relay to energize the blower motor in response to heating demand The relay coil is energized when the 1st stage electric heat relay closes When K20 is energized its N O contacts close to energize jack plug JP46 pin 2 located on blower drive control A15 When JP46 2 is energized the blower drive control immediately energizes the blower on heating speed Heating speed will override cooling speed K20 2 will energize the economizer if used refer to wiring diagram 208 240 VOLT TRANSFORMER PRIMARY SECONDARY 240 VOLTS RED 208 VOLTS FIGURE 3 YELLOW E Circuit Breaker CB8 1 units amp Fuse F1 All transformers used in the CBX32MV 1 series units are equipped with internal secondary voltage overcurrent protection Each transformer uses a manual re set circuit breaker CB8 located on the transformer The circuit breaker is connected in series with the blue secondary voltage wire and is rated at 3 5 Amps CBX23MV 2 units and later are equipped with a fuse F1 rated at 3 amps F1 is connected in series with the blue secondary voltage wire and like CB8 provides overcurrent protection F Plastic Drain Pans Both upflow downflow and horizontal drain pans are provided and installed on the CBX32MV units The drain pans are made from fiberglass filled plastic The drain hole is used for right hand air discharge only
25. several voltages and KW sizes and can be field installed in the cabinet Some CBX32MV applications may include the optional Lennox ComfortSense 7000 SignatureStat or Efficiency Plus Comfort Management Control CCB1 The purpose of both controls is to vary indoor blower speed in response to indoor dehumidification demand When a two speed outdoor unit is used compressor speed can also be controlled by the SignatureStat or CCB1 in response to indoor dehumidification demand Information contained in this manual is intended for use by experienced HVAC service technicians only All specifications are subject to change Procedures outlined in this manual are presented as a recommendation only and do not supersede or replace local or state codes Technical Publications Page 1 AWARNING Electric shock hazard Can cause injury or death Before attempting to perform anv service or maintenance turn the electrical power to unit OFF at discon nect switch es Unit mav have multiple power supplies ELECTROSTATIC DISCHARGE ESD Precautions and Procedures A CAUTION Electrostatic discharge can affect electronic components Take precautions during unit instal lation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic discharge bv putting the unit the control and the technician at the same electrostatic potential Neutralize electro static charge by touchi
26. 15 445 465 505 540 4 375 420 440 475 515 550 575 610 645 7 CBX32MV 068 BLOWER PERFORMANCE 0 through 0 80 in w g 0 Through 200 Pa External Static Pressure Range BDC3 Jumper Speed Positions HEAT Speed COOL Speed ADJUST Jumper Setting 2150 1015 1640 775 1840 870 2075 980 2150 1015 2030 960 1465 690 1625 765 1800 850 2000 945 1800 850 1250 590 1390 655 1560 735 1720 810 NOTES effectof static pressure filter and electric heater resistance is included the air volumes listed First stage cooling air volume is 60 of COOL speed setting Production units September 2005 and later continuous blower speed for is approximately 38 of COOL speed setting Earlier production units continuous blower speed is approximatelv 5090 of COOL speed setting Lennox Harmony III Zone Control applications minimum blower speed is 442 cfm 210 L s CBX32MV 068 BLOWER MOTOR WATTS AT Plus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed COOL Speed CBX32MV 068 BLOWER MOTOR WATTS AT NORM BDC3 SETTING Adjust Jumper at NORM Setting BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Positions 0 1 25 0
27. 208 230V electric heat sections may be equipped with circuit breakers The circuit breakers are designated by CB in the model number contacts to close When the relay is de energized the disk cools and the contacts open The relays energize different stages of heat as well as the blower The blower is always first on and last off 3 Circuit Breaker CB1 CB2 and CB3 208 230 volt only Line voltage connections are made to circuit breakers CB1 CB2 and CB3 in the electric heat sections with circuit breakers designated by CB in the model numbers Table 3 shows the amperage rating for each circuit breaker used Single phase electric heat uses two pole circuit breakers while three phase electric heat uses three pole circuit breakers TABLE 3 1 515 amp Secondary S20 Temperature Limits Both the primary S15 and secondary S20 limits are ECB29 CIRCUIT BREAKERS CB1 CB2 CB3 UNIT AMPS AMPS ee located on the electric heat vestibule panel and are ECB29 5CB 1 P 30 AMP exposed directly to the air stream through an opening in the panel The high temperature limits are SPST N C ECB29 8CB 1 P 50 AMP limits with the primary limit being an auto reset limit and the ECB29 12 5CB 1 P 25 50AMP secondarv limit being a one time limit One time limits ECB29 15CB 1 P must be replaced when opened The limits are factorv set ECB29 25CB 1 P and are not adjustable 30 60AMP
28. 20CB L25CB 35A 50A 35A NOTE USE COPPER CONDUCTORS ONLY LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS CIRCUIT EQUIPMENT GROUND I LENNOX us WIRING DIAGRAM H EATING UNITS ELECTRIC ECB29 20CB 25CB Y Supersedes Form No New Form No 551 707W 1995 Lennox Litho U S A Industries Inc H ECB29 20CB 25CB 208 230V THREE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 1 When there is a call for heat W1 of the thermostat energizes the electric heat relays K32 and K34 with 24VAC When K32 1 closes the blower is energized on heating speed and economizer heat relay K20 2 is energized see unit schematic figure 26 When K32 1 and K32 2 closes assuming the primary S15 and secondary S20 limit switches are closed electric heat elements HE1 and HE2 are energized When K34 1 closes assuming the N C primary S15 and secondary S20 limit switches are closed electric heat element HE3 is energized SECOND STAGE HEAT remove jumper between W2 and R 5 When K34 2 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relays K33 and K35 with 24VAC When K33 1 closes the blower if not energized is energized on heating speed and economizer heat relay K43 is energized see 208 230VAC CB schematic
29. CONDUCTORS ONLY 42 iii A A A AT L2 12 12 L2 L2 Be ECB29 5CB BCB ECB29 2 5 5 8KW UNITS TS UNI EQUTEMENT A GROUND AN CONNECT POWER WIRES FROM UNT LABELED LI AND L2 TO TB2 TERMINAL STRIP ON HEATER PLATE REFER TO UNTI NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE EQUIPMENT GROUND IS LOCATED IN INDOOR UNIT E ELEMENT LENNUX 5 Inc WIRING DIAGRAM HEATING UNITS ELECTRIC ECB29 2 5 5 8 l P ECB29 5CB 8CB 1 Supersedes Form No New Form No 551 616W 1995 Lennox Industries Inc Litho U S A B ECB29 5 5CB 8 8CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION 1 When there is a call for heat W1 of the thermostat 3 Assuming the N C primary 815 and secondary S20 energizes the electric heat relay K32 with 24VAC limit switches are closed electric heat element HE1 is energized 2 When K32 1 closes the blower is energized on 4 When K32 2 closes assuming the N C primary S15 heating speed and economizer heat relay K20 2 is and secondary S20 limit switches are closed electric energized see unit schematic figure 26 heat element HE2 is energized Page 36 COMPONENT ARRANGEMENT DESCRIPTIO
30. D 2 060 BLOWER MOTOR WATTS Plus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Tap 1 Speed Tap 2 Tap 3 Tap 4 COOL Speed CBX32MV 048 AND CBX32MV 060 BLOWER MOTOR WATTS AT NORM BDC3 SETTING Adjust Jumper at NORM Setting BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 1 385 425 465 495 525 565 600 635 Speed Tap 2 440 485 520 555 595 640 670 705 Tap 3 520 560 605 640 685 765 785 805 Tap 4 625 665 710 760 800 835 875 925 COOL Speed CBX32MV 048 AND CBX32MV 060 BLOWER MOTOR WATTS Minus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 1 265 305 340 370 410 440 460 505 540 s Tap2 320 350 395 420 450 475 515 545 580 Tap 3 375 410 435 470 515 545 575 610 645 Tap4 400 435 480 525 555 595 640 670 700 COOL Tap 1 140 170 195 215 250 275 300 335 360 2 200 230 260 285 315 355 385 415 450 280 315 340 380 4
31. ION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITHOUT SignatureStat OR CCB1 WITH HARMONY UNIT JUMPERS SEQUENCE OF OPERATION Harmonv controls blower speed according to size Single or Two Speed i Condensing Unit OtoR of demand through pulse width modulated signal to DS Harmonv controls blower speed according to size aingle or Two Speed NONE of demand through pulse width modulated signal Heat Pump to DS NOTE CAUTION HIGH VOLTAGE If using Harmony kit locate blower relay K20 and remove and tape off any one of four wires NOTE Continuous fan CFM will be 50 of COOL speed Blower will run on HEAT speed during Heat operation Production August 2002 and later Reduced blower speed is 70 of COOL for ALL model units Production prior to August 2002 Reduced blower speed is 65 of COOL for the 036 units and 60 of COOL for 048 and 060 units Two Speed DS to Y1 60 65 70 of COOL Condensing Unit Oto R COOL Y 1 1 2 1 1 2 Oto R See table 10 Page 35 COMPONENT ARRANGEMENT 2 6 8 CB OR TB DESCRIPTION KW AMPS COMPONENT 5 30A CIRCUIT BREAKER ELECTRIC HEAT 8 50A ELEMENT ELECTRIC HEAT FOR USE WITH 3 PLUG ELECTRIC HEAT CIRCUIT BREAKERS RELAY SEQUENCER ELECTRIC HEAT ONLY SWITCH LIMIT PRIMARY AUTO RESE LINE VOLTAGE FIELD INSTALLED SWITCH LIMIT SECONDARY TERMINAL BLOCK UNIT DENOTES OPTIONAL COMPONENTS NOTE USE COPPER
32. IT SHOWN IN UPFLOW POSITION SUPPLY RETURN FIGURE 32 2 Punch a 1 4 6mm diameter hole in supply and return air plenums Insert manometer hose flush with inside edge of hole or insulation in the supply plenum only Seal around the hose with permagum Connect the other end of the hose to the zero end of the manometer Leave the other end of the manometer open to the atmosphere 3 With only the blower motor running and the evaporator coil dry observe and take note of the manometer reading 4 Repeat step 2 for the return air plenum Insert manometer hose to the opposite end of the zero side of the manometer Leave the zero side of the manometer open to atmosphere 5 Repeat step 3 6 Add the absolute values of the supply air reading and the return air reading to get the external static pressure of the unit For example 20 in wg on the return and 7 30 in wg on the supply result in external static pressure of 50 in wg External static should not exceed 80 w g 200Pa Adjust blower motor speed to deliver the air desired according to job requirements 7 Seal around the holes when the check is complete IX MAINTENANCE AWARNING Electric shock hazard Can cause injury or death Before attempting to perform anv service or maintenance turn the electrical power to unit OFF at discon nect switch es Unit mav have multiple power supplies At the beginning of each hea
33. J DOWNFLOW RAIL FS FIGURE 28 T HORIZONTAL DRAIN PAN 10 Install the horizontal shield 068 model on the front edge of the horizontal drain pan as shown in figure 29 LEFT HAND DISCHARGE CONFIGURATION HORIZONTAL DRIP SHIELD 068 MODEL FRONT EDGE OF HORIZONTAL DRAIN PAN DOWNFLOW RAIL FIGURE 29 NOTE For horizontal applications in high humiditv areas remove the downflow rail closest to the drain pan To remove rail remove screw from rail at back of unit and at cabinet support rail Remove downflow rail then replace screws Also seal around the exiting drain pipe liquid and suction lines to prevent infiltration of humid air 11 Flip access door Knock out the portion of door for the drain pipes and attach to the cabinet with screw provided Replace access door on the unit Page 31 12 Set unit so it is sloped toward the drain pan 1 4 6mm Connect return and supply air plenums as required using sheet metal screws 13 If hanging the unit it must be supported along the entire length of the cabinet If using chain or strap use a piece of angle iron or sheet metal attached to the unit either above or below so that the full length of the cabinet is supported Use securing screws no longer than 1 2 13mm to avoid damage to coil or filter See figure 25 Connect return and supply air plenums as required using sheet metal
34. LOW COMBUSTIBLE BASE DIMENSIONS T2 TOP VIEW SUPPLY AIR OPENING 22 1 8 E 562 Ls 13 3 8 2251540 a Y 2 51 ges VIEW FIGURE 23 D Horizontal Right Hand Discharge Application NOTE For horizontal applications a secondary drain pan is recommended Refer to local codes 1 Before operating the unit remove access panels and the horizontal drip shield 068 model and the corrugated padding between the blower and coil assembly Discard the corrugated padding and the downflow drip shields from the foam pads on top of the unit 2 Install the horizontal shield on the front edge of the horizontal drain pan as shown in figure 24 3 No further adjustment is necessary Set unit so it is sloped toward the drain pan 1 4 6mm See figure 24 4 If hanging the unit it must be supported along the entire length of the cabinet If using chain or strap use a piece of angle iron or sheet metal attached to the unit either above or below so that the full length of the cabinet is supported Use securing screws no longer than 1 2 13mm to avoid damage to coil or filter See figure 25 Connect return and supply air plenums as required using sheet metal screws NOTE For horizontal applications in high humidity areas remove the downflow rail closest to the drain pan Removal of downflow rail will prevent sweating in high humidity areas To remove rail remove screw from rail at back of unit and at cabinet s
35. MENT HE1 PRIMARV LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 ELECTRIC HEAT CIRCUIT BREAKER SEQUENCER RELAY K32 CB1 FIGURE 7 ECB29 8 AND 8CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ECB29 8 CIRCUIT BREAKER CB1 ELECTRIC HEAT VESTIBULE PANEL ELECTRIC HEAT ELEMENT HE2 ELECTRIC HEAT ELEMENT HE1 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 ELECTRIC HEAT ELECTRIC HEAT SEQUENCER RELAY K33 SEQUENCER RELAY K32 FIGURE 8 Page 19 ECB29 8 10 208 230 THREE PHASE ECB29 12 5CB 15CB 208 230 SINGLE 8 THREE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT ELEMENT HE3 ELECTRIC HEAT hes ie ELECTRIC HEAT 201 WV ELEMENT HE2 VESTIBULE PANEL SEQUENCER RELAY K33 CIRCUIT BREAKER ELECTRIC HEAT ELEMENT HE1 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 PRIMARY LIMIT S15 ELECTRIC HEAT amp SECONDARY LIMIT S20 SEQUENCER RELAY K32 CB2 FIGURE 9 ECB29 20CB 25CB 208 230 THREE PHASE ELECTRIC HEAT ECB29 25CB 208 230 SINGLE PHASE ea ac ar HE2 ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT y ELECTRIC HEAT ELEMENT HES L va SEQUENCER RELAY K33 4 4 ELECTRIC VESTIBULE PANEL E NI PRIMARV ON 372 amp SECONDARY LIMIT 520 SS CIRCUIT BREAKER 0 CX S LECTRIC HEAT ELEMENT
36. N COMPONENT CIRCUIT BREAKER ELECTRIC HEAT CIRCUIT BREAKER ELECTRIC HEAT ELEMENT ELECTRIC HEAT ELEMENT ELECTRIC HEAT PLUG ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT SWITCH LIMIT PRIMARY AUTO RESET SWITCH LIMIT SECONDARY LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS CIRCUIT 2 CIRCUIT Li 7 MA ls 75 PN AA UN P TAL A EQUIPMENT EQUIPMENT 8 GROUND a GROUND i I 0 515 515 A REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT 520 520 520 PROTECTION SIZE pe HE NOTE USE COPPER CONDUCTORS ONLY LENNOX 2 WIRING DIAGRAM 10 95 HEATING UNITS ELECTRIC ECB29 12 5CB ISCB l P Supersedes Form No New Form No 531 61 4W 1995 Lennox Industries Inc Litho U S A D ECB29 12 5CB 15CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT SECOND STAGE HEAT remove jumper between W2 and R 1 When there is a call for heat W1 of the thermostat energizes the electric heat relay K32 with 24VAC 4 When K32 2 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second 2 When K32 1 closes the blower is energized on stage heat demand energizing the electric heat relav heating speed and economizer heat relay K20 2 is K33 with 24VAC
37. This evaporation produces a cooling effect during wintertime this phenomenon is called wind chill Dry air is capable of absorbing more moisture away from the skin thereby increasing the cooling effect When the thermostat senses that the indoor humidity level is above the control setpoint the control places the CBX32MV and outdoor unit in a dehumidification mode To produce drier air the CBX32MV will slow down the speed of the air crossing the indoor coil Because the air is moving much slower than normal the indoor coil is allowed more time to remove moisture from the air a higher percentage of the air passing over the coil is cooled to its dew point removing more moisture At the same time the two stage outdoor unit will switch to high speed to produce a colder indoor coil The colder indoor coil and slower moving air combine to produce drier supply air Page 22 NOTE The indoor blower speed is reduced in order to slow the air speed across the indoor coil The supplv air exiting the unit mav not feel as forceful This is normal Remember that when the unit is in dehumidification mode the comfort level is increased because the unit is producing cooler drier air The exact sequence of operation to produce cooler drier air is described in the following section Other Conditions Which Adverselv Affect Thermostat Performance Blower speed selection can adverselv affect thermostat performance Higher blower speeds should be sel
38. ac Dehumidification 0 52 reater than set point Signaturestat will trv to maintain room humiditv Dehumidification 0 60 65 setpoint by allowing the call ONLY 1 On On On On Demand VAC High 7096 room space to maintain a cooler room thermostat setpoint ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING BASIC MODE only active on a Y1 thermostat demand 24 Dehumidificati 60907659 2 and de energizes D enumiomeanon i 9 6576 a call for dehumidification wea 2 fon fon fon jon pea vac e PRECISION MODE operates independent of a Y1 thermostat demand C 7 gins when humidity is gt aul EB Jon on ov Demand o 6070 6576 greater than set point 70 Dehumidification ENG Signaturestat will try to setpoint by allowing the Jumpers at indoor unit with a two stage outdoor unit room space to maintain a With Condensing unit Y2 and R to O cooler room thermostat With Heat Pump none setpoint During dehumidification cooling blower speed is as follows 7096 of COOL cfm for 018 024 024 030 amp 068 6596 for 036 6096 for 048 amp 060 units n Precision mode Signature thermostat built BEFORE October 2003 will maintain the room temperature up to 3 F 1 8 C cooler than room thermostat setting Precision thermostats built AFTER October 2003 will maintain the room temperature up to 2 F 1 2 C cooler than the room thermostat setting Page 27 VI CONFIGURATION MODIFICATIONS
39. ack and install it on the opposite side of coil 5 Remove screws from top cap Remove horizontal drip shield screw located in the center of the back coil end seal See figure 26 6 Rotate horizontal drip shield 180 front to back 7 Remove plastic plug from left hole on coil front end seal and re install plug in back hole Re install horizontal drip shield screw in front coil end seal Drip shield should drain downward into horizontal drain pan inside coil Rotate top cap 180 front to back and align with unused screw holes Holes must align with front and back coil end plates Note that top cap has a 45 bend on one side and 90 bend on the other The 90 bend must be on the same side as the horizontal drain pan See figures 26 and 27 1 NOTE Use extreme care when re installing screws into coil end plate engaging holes Coil damage could result by misalignment FIELD MODIFICATION FOR LEFT HAND DISCHARGE CABINET SUPPORT COIL SHOWN IN UP FLOW POSITION FOR EASY CONVERSION FIGURE 26 BACK COIL END SEAL 90 BEND FIGURE 27 9 From the upflow position replace coil assembly Then flip cabinet 90 to the left and set into place Replace coil assembly Secure coil in place by bending down tab on cabinet support rail See figures 26 and 28 LEFT HAND DISCHARGE CONFIGURATION HORIZONTAL DRIP SHIELD SECURING TAB ON CABINET SUPPORT RAIL is
40. ately 5 Check to see that heat if applicable is operating D Insulation Outdoor piping insulation should be inspected yearly for deterioration If necessary replace with same materials Page 33 X WIRING SCHEMATIC AND OPERATION SEQUENCE FIELD WIRING FOR UNITS WITHOUT CIRCUIT BREAKERS CIRCUIT 2 TB2 LI Ll 12 Au QE EQUIPMENT GROUND A CONNECT POWER WIRES FROM HEATER LABELED LI L2 ON P VOLTAGE UNITS AND LI L2 L3 ON Y VOLTAGE UNITS TO TB2 TERMINAL STRIP IN INDOOR UNIT 8 EQUIPMENT GROUND LOCATED IN INDOOR UNIT LUG MOTOR VAR SPD Q Kk20 I 2BELAY BLOMER Q P46 PLUG OUTPUT P48 PI GROUND CIRCUIT T K20 7 l BLACK 47 ORANGE gt K20 O BLACK COM RED 208V 2 osne 2sov 4 4 9 RECOMMENDED BLOWER SPEED SELECTION SPEED SELECTION COOL HEAT CONDENS ME a l ELECTRIC rata HEAT ONLY 024 COOL COOL HEAT HEAT 030 PIN 35 PIN 3 PIN 4 PIN 4 036 COOL COOL HEAT HEAT PIN 3 PIN 3 PIN 4 PIN 4 COOL COOL HEAT HEAT PIN 2 e2 PIN 1 PIN 060 COOL COOL HEAT HEAT 068 43 JPIN 3 PIN 1 PIN 1 SETTING FOR HEAT FIELD WIRING FOR UNITS WITH CIRCUIT BREAKERS CIRCUIT 4 CIRCUIT 3 CIRCUIT 2 A 2 A CB A e T L2 za A L5 Ar EQUIPMENT EQUIPMENT EQUIPMENT GROUND GROUND GROUND A L3 IS NOT PRESENT ON
41. atts Various External Static Pressures in wg Pa Speed Positions k 0 6 150 COOL Speed BDC3 Motor Watts Various External Static Pressures wg Speed Positions k 8 f 0 6 150 HEAT Speed COOL Speed Tap 1 Tap 2 57 65 83 94 110 119 134 Tap 3 110 124 141 157 176 188 213 Tap 4 148 170 195 207 230 248 272 0 7 175 148 231 282 0 8 200 Page 4 CBX32MV 024 030 BLOWER PERFORMANCE 0 through 0 80 in w g 0 through 200 Pa External Static Pressure Range BDC3 Jumper Speed Positions HEAT Speed COOL Speed ADJUST Jumper 3 Setting cfm NOTES The effect of static pressure filter and electric heater resistance is included in the air volumes listed Low speed cooling air volume is 70 of COOL speed setting Production units September 2005 and later continuous blower speed for is approximately 38 of COOL speed setting Earlier production units continuous blower speed is approximately 50 of COOL speed setting Harmony Zone III Control applications Low speed cooling is approximately 300 cfm 145 L s CBX32MV 024 030 BLOWER MOTOR WATTS AT Plus BDC3 SETTING Adjust Jumper at Setting BDC3 Jumper Motor Watts Various External Static Pressures in wg Pa Speed Positions 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200
42. e Procedure e Disconnect power to unit Motor rocks slightly This is normal start up for the variable speed Change delay pin setting on the BDC3 board to 1 when starting motor e Remove wires from terminal strips in control box Check power at motor e Install jumpers between R and e Check low voltage 24vac R to C at motor Y2 Reand DS and R ang a Check low voltage connection G Y R C at e Turn on power to unit Blower should operate Motor will not start motor cool speed no movement e Check for unseated pins on motor harness e When check is complete disconnect power and e Test with temporary jumper between R G replace delay setting to original position e Check motor for tight shaft HEAT SPEED e Run moisture check e Disconnect power to the unit Motor rocks but e Check for loose or compliant motor mount e Change delay pin setting on the BDC3 board to 1 hl f Make Sure blower nestle e Remove wires from terminal strips in control box Check line voltage for variation or sag Install jumper between R and W1 e Check low voltage connections G Y R C e on power to unit Blower should operate Motor starts but at pue fad ois ae heat speed Go C LU ee e When check is complete disconnect power and bae DS on terminal strip for CFM replace delav setting to original position comman Notes on 5 Pin AC Line Connection
43. e default setting for dehumidification is OFF To turn on basic dehumidification mode select BASIC To turn on precision dehumidification mode select PRECISION See figure 14 Setting Dehumidify Mode HUMIDIFY MODE OFF BASIC PRECISION HUM MENU SELECT FIGURE 14 5 The Humidity Menu appears Basic BAS is displayed on the right hand of the screen Now you can program the dehumidity percentage that you want Page 23 Setting Dehumiditv Levels Setting Dehumiditv Levels HUMIDIFV MENU DEHUMIDIFV MENU MODE BAS MODE OFF DEHUMIDIFV 4590 DEHUMIDIFV 45 MAIN MENU SELECT MAIN MENU SELECT FIGURE 15 Figure 16 Dehumidity Sensor Settings The dehumidity sensor settings have minimum and 2 Use the up and down button to adjust the humiditv level maximum settings The sensor settings can be adjusted in See figure 17 1 increments See table 9 Setting Dehumidity Levels TABLE 9 Dehumidity Setpoint Range DEHUMIDIFY CONTROL 45 1 On the humidity menu press the up or down button to Figure 17 again highlight DEHUMIDIFY See figure 16 9 MAIN MENU SELECT Page 24 OPERATING SEQUENCE Svstem Condition TABLE 10 TYPICAL CBX32MV CCB1 and TWO SPEED OUTDOOR UNIT OPERATING SEQUENCE SYSTEM DEMAND Thermostat Demand Relative Humidity EfficiencyPlus Lights doe Compres sor Speed SYSTEM RESPONSE Blower CFM COOL Comments Normal operation
44. e is a dehumidification demand This means that the D terminal has 24V on it even in HEAT and OFF modes Basic Mode Dehumidification only with a cooling demand COOL is on then D is active reverse logic off and G is on if not already on Y1 and Y2 if available is on Precision Mode Dehumidification with or without Cooling demand D is active reverse logic off and G 1 and V2 if available are on Note that H is inactive off during dehumidification The D terminal controls dehumidification When a dehumidification demand is present the D terminal becomes de energized Otherwise 24VAC is present in off mode and heating mode unless there is a call for dehumidification Tables 12 and 13 show system response to thermostat demand Dehumidify Mode Screen SignatureStat Only NOTE See the ComfortSense 7000 user guide for interface instructions for dehumidify mode operations NOTE Basic or Precision mode must be turned on before you can adjust the dehumidify level on the thermostat 1 From the home screen press MENU 2 Use the UP or DOWN button to highlight DEHUMIDIFY See figure 12 Setting Humidity Levels MAIN MENU PROGRAM HEAT COOL HUMIDIFY DEHUMIDIFY HOME SELECT FIGURE 12 3 Press SELECT to choose MODE Setting Humidity Levels HUMIDIFY MENU MODE OFF DEHUMIDIFY 45 MAIN MENU SELECT FIGURE 13 4 To turn off dehumidification control entirely select OFF Th
45. e on demand from the thermostat 2 The refrigerant circuit is charged with R410A refrigerant See condensing unit rating plate for correct charge amount 3 Refer to the correct condensing unit service manual for more information C Heating Start Up 1 Set the fan switch to AUTO or ON and move the system selection switch to HEAT Adjust the thermostat setting above room temperature 2 The indoor blower immediately starts and the electric heat will stage on based on sequence timing D Safety or Emergency Shutdown Turn off unit power at circuit breaker E Extended Period Shutdown Turn off thermostat or set to UNOCCUPIED mode Turn off power to unit All access panels and covers must be in place and secured The condensate assembly should be clean and dry for extended period shutdown Page 32 Vill TYPICAL OPERATING CHARACTERISTICS A Blower Operation and Adjustment NOTE The following is a generalized procedure and does not apply to all thermostat controls 1 Blower operation is dependent on thermostat control system 2 Generally blower operation is set at thermostat subbase fan switch With fan switch in ON position blower operates continuously With fan switch in AUTO position blower cycles with demand 3 In all cases blower and entire unit will be off when the system switch is in OFF position B External Static Pressure 1 Measure tap locations as shown in figure 32 STATIC PRESSURE TEST UN
46. e replaced 5 Heating Elements HE1 through HE6 2 Electric Heat Sequencer Relays K32 K33 K34 K35 and K116 208 230 volt only Relays K32 K33 K34 K35 and K116 are N O sequencer relays with a resistive element for a coil and abi metal disk which actuates the contacts The relays are located on the electric heat vestibule panel and are energized by a 24V heating demand W1 W2 and W3 via jack plug 2 J2 which is used to connect electric heat to the blower coil control circuit When energized the internal resistance heats the bi metal disk causing the Page 15 Heating elements are composed of helix wound bare nichrome wire exposed directly to the air stream The elements are supported by insulators mounted to the wire frame For single phase applications one elementis used per stage Each stage is energized independently by the corresponding relay located on the electric heat vestibule arranged in a three phase delta Once energized heat transfer is instantaneous High temperature protection is provided by primary and secondary high temperature limits TABLE 4 ELECTRIC HEAT DATA SINGLE PHASE ELECTRIC HEAT CBX32MV 018 024 CBX32MV 024 030 No of Volts kW Steps Input Input Model Number ECB29 2 5 28K30 Terminal Block ECB29 5 28K31 Terminal Block ECB29 5CB 28K32 30A Circuit breaker ECB29 6 47L22 Terminal Block ECB29 6CB 47L23 35A Circuit breaker ECB29 8 28K33 Terminal Block ECB29 8CB
47. ected to provide maximum sensible cooling while lower blower speeds should be selected to provide maximum humiditv removal Refer to CBX32MV and applicable thermostat installation instructions It is recommended that the indoor blower be left in AUTO mode at all times During dehumidification mode the indoor coil and drain pan may become saturated with moisture If the indoor blower is left in ON mode much of that moisture can be re evaporated into the living space between thermostat demands This can create a constant demand for humidity removal and may cause extended compressor run times Refer to table 8 for jumpers per application TABLE 8 JUMPERS REQUIRED DS to Y1 and Y1 to Y2 Humidity Control OFF Humidity Control ON Single Speed Heat Pump Two Speed DS to Y1 Condensing Unit Heat Pump Condensing Single Speed Two Speed DS to Y1 and Y1 to Y2 and OtoR DS to Y1 and OtoR Single Speed Y1 to Y2 Two Speed None Single Speed Y1 to Y2 and OtoR Unit Two Speed OtoR Operation Dehumidification is provided only when the thermostat is in cool mode Dehumidification D terminal wires to variable speed blower reverse logic active on low signal 24VAC When the unit is in heating mode the dehumidification function is off The default mode for dehumidification is OFF and needs to be activated during installation The D terminal is active whenever the thermostat is powered EXCEPT when ther
48. ermostat demand begins when humidity is 52 di reater than set point 60 65 SignatureStat will try to setpoint by allowing the Jumpers at indoor unit with a single stage outdoor unit room space to maintain a With Condensing unit Y1 to Y2 and R to O cooler room thermostat With Heat Pump Y1 to Y2 setpoint During dehumidification cooling blower speed is as follows 70 of COOL cfm for 018 024 024 030 amp 068 65 for 036 60 for 048 amp 060 units In Precision mode Signature thermostat built BEFORE October 2003 will maintain the room temperature up to 3 F 1 8 C cooler than room thermostat setting Precision thermostat built AFTER October 2003 will maintain the room temperature up to 2 F 1 2 C cooler than the room thermostat setting Page 26 TABLE 13 CBX32MV SignatureStat or ComfortSense 7000 and TWO STAGE OUTDOOR UNIT OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Relative Humidity System Step Compressor NO CALL FOR DEHUMIDIFICATION Normal Operation 7s N lo ti 24 blower follow thermostat ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING SignatureStat energizes Y2 and de energizes D on BASIC MODE only active on a 1 thermostat demand Dehumidification d m a call for dehumidification PRECISION MODE operates independent of a Y1 thermostat demand 8 Dehumidification mode be gins when humiditv is Comments Normal Operation 1 fon Jon Jon Acceptable V
49. hp W 10 x 7 279 x 178 1 2 373 10 x 8 279 x 203 1 2 373 10 x 8 279 x 203 1 2 373 Filters 1 Number size in 1 15 x 20 x 1 1 20 x 20 x 1 1 20 x 22x 1 mm 381x508x25 508 x 508 x 25 508 x 559 x 25 Shipping Data 1 Package lbs kg 126 57 152 69 183 83 ELECTRICAL DATA Voltage phase 60hz Maximum overcurrent protection unit only Minimum circuit ampacity unit only 208 230V 1ph 15 5 Page 2 208 230V 1ph 15 5 208 230V 1ph 15 5 Specifications General Data Model Number CBX32MV 048 CBX32MV 060 CBX32MV 068 Nominal cooling capacity tons kW 4 14 1 5 17 6 5 17 64 Refrigerant R 410A R 410A R 410A Connections Suction vapor line sweat 7 8 22 2 1 1 8 28 1 1 8 28 Liquid line sweat 3 8 9 5 3 8 9 5 3 8 9 5 Condensate drain fpt 2 3 4 19 2 3 4 19 2 3 4 19 Indoor Net face area ft 2 m2 7 22 0 67 7 22 0 67 7 77 0 72 el Tube outside diameter in mm 3 8 9 5 3 8 9 5 3 8 9 5 Number of rows 3 3 3 Fins per inch fins per m 12 472 12 472 12 472 Blower Data Wheel nominal diameter x width in mm 12 x 9 305 x 229 12 x 9 305 x 229 15 x 9 381 x 229 Motor output hp W 1 746 1 746 1 746 Filters 1 Number and size in 1 20 x 24 x 1 1 20 x 24 x 1 1 20 x 25 x 1 mm 508 x 610 x 25 508 x 610 x 25 508 x 635 x 25 Shipping Data 1 Package Ibs kg 212 96 212 96 244 111
50. ights that are on will stay on until the first thermostat heating demand IMPORTANT If power to unit is turned on with CCB1 calling for humidity removal outdoor unit may be locked into high speed indefinitely To reset move humidity slide switch all the way down then back up to desired setpoint with unit running Reduced blower speed is 70 of cool for 018 024 and 024 030 units 65 of COOL for the 036 units 60 of COOL for 048 and 060 units Jf the two speed control on a two speed outdoor unit is set for LATCH 2 15 minutes or LATCH 30 minutes the compressor will latch into high speed after a Y1 demand has occurred for that period of time Page 25 TABLE 11 TYPICAL CBX32MV CCB1 and SINGLE SPEED OUTDOOR UNIT OPERATING SEQUENCE OPERATING SEQUENCE System Condition Thermostat Demand SYSTEM DEMAND Relative Humidity EfficiencvPlus Lights Blower CFM COOL SYSTEM RESPONSE Comments Normal operation Call for humidity re moval during call for cooling Humidity demand satisfied during ther mostat demand Call for cooling after call for humidity removal Humidity demand sat isfied between thermo stat demands unit off Y1 Acceptable None Acceptable None COOL COOL Compressor demand and indoor blower speed follow thermostat demand Dehumidification mode begins Change over setpoint Over Setpoint 60 65 70 of COOL 60 65 70 of COOL when re
51. ing a W1 demand for electric heat operation These jumper selections are activated when W1 is energized with or without a Y1 demand for heat pump compressor DELAY The DELAY jumper is used to set the specific motor fan mode of operation during cooling Depending on the application one of four fan options may be chosen by moving the jumper pins to the appropriate set of pins Options 1 2 3 or 4 will have an increased dehumidification effect on the system Option 1 will have the least effect and option 4 will have the greatest effect Applications with the EfficiencyPlus CCB1 humidity control create different CFM volumes For example during a first stage cooling call two speed outdoor unit with no demand from the CCB1 the air volume is 40 of the COOL jumper selection For a normal COOL Pin 2 setting for CBX32MV 036 the CFM is 1125 the reduced speed is 450 CFM 1125 x 40 450 This arrangement provides for additional dehumidification during standard first stage cooling See tables 10 and 11 for various scenarios concerning use of the CCB1 humidity control and the CBX32MV series unit Applications with the Lennox SignatureStat but no demand for de humidification will operate as follows during a first stage cooling call two stage outdoor unit the air volume is 7096 of the COOL jumper selection For a normal COOL Pin 2 setting for CBX32MV 036 the CFM is 1125 the reduced speed is 788 CFM 1125 x 70 788 This ar
52. ious External Static Pressures in wg Pa Speed Positions 0 1 25 02 50 0 3 75 04 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed Tap 1 120 135 165 185 205 225 245 265 300 Tap2 140 165 195 215 245 270 300 315 335 Tap 3 185 210 240 265 285 310 330 360 385 Tap4 245 255 290 310 335 355 380 405 430 COOL Speed Tap 1 90 110 135 155 180 195 210 230 250 Tap2 120 140 160 185 215 235 255 275 295 Tap 3 160 190 225 240 275 295 320 350 380 Tap4 245 255 290 310 335 355 380 405 430 Page 6 CBX32MV 048 AND CBX32MV 060 BLOWER PERFORMANCE 0 through 0 80 in w g 0 Through 200 Pa External Static Pressure Range BDC3 Jumper Speed Positions HEAT Speed COOL Speed ADJUST Jumper Setting cfm 2150 1015 2145 1010 3 2005 945 2005 945 1770 835 1725 815 NOTES effectof static pressure filter and electric heater resistance included in the air volumes listed Low speed cooling air volume is 70 of COOL speed setting 60 of COOL speed for production prior to August 2002 Production units September 2005 and later continuous blower speed for is approximately 38 of COOL speed setting Earlier production units continuous blower speed is approximately 50 of COOL speed setting Harmony Zone Control applications Low speed cooling is approximately 400 cfm 190 L s Lennox Harmony III Zone Control applications minimum blower speed is 442 cfm 210 L s CBX32MV 048 AN
53. lative humidity is greater than setpoint When humidity demand is satisfied blower immediately shifts to the Change to Over setpoint Acceptable None COOL Off COOL CFM in order to hasten the end of the cycle Dehumidification mode begins Over setpoint Over setpoint 1 or more 60 65 70 of COOL Change to when relative humidity is greater than setpoint While unit is not operating no thermo stat demand slide switch is moved down and back up Blower operates at cycle Acceptable None Note When changing unit mode of operation from cooling to heating indicating lights that are will stav on until the first thermostat heating demand Reduced blower speed is 70 of COOL for 018 024 and 024 030 65 of COOL for the 036 units 60 of COOL for 048 and 060 series units TABLE 12 CBX32MV SignatureStat or ComfortSense 7000 and SINGLE STAGE OUTDOOR UNIT OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Demand Relative Relative Humidity Compres NO CALL FOR DEHUMIDIFICATION 24 Compressor and indoor Normal Operation 1 On Acceptable VAC High 100 blower follow thermostat demand BASIC MODE only active on a Y1 thermostat demand 24 l Y1 and de energizes D on Svstem Condition Comments Dehumidification 0 60 65 call for dehumidification PRECISION MODE operates independent of a Y1 th
54. lectric heat if used HEATING 3 When there is a call for heat W1 of the thermostat energizes the electric heat relay K32 covered in the electric heat section After K32 closes blower relay K20 1 is energized 4 Blower motor B3 is energized on heating speed after K20 1 closes see electric heat 5 Economizer relay K20 2 if used is energized after K32 1 closes see electric heat section 6 K20 2 closes energizing the economizer with 24VAC COOLING 7 See Table 16 for cooling sequence of operation Page 34 TABLE 16 CBX32MV COOLING OPERATION AND JUMPER SUMMARX OPTIONAL ACCESSORIES WITHOUT SignatureStat OR CCB1 WITHOUT HARMONV THERMOSTAT JUMPERS DEMAND BLOWER SPEED Single Speed Condensing Unit COOL COOL Single Speed Heat Pump SA 2 a 60 65 70 of COOL Two Speed Heat Pump DS to Y1 CBX32MV COOLING OPERATION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITH CCB1 WITHOUT HARMONY UNIT JUMPERS THERMOSTAT DEMAND amp BLOWER SPEED Single Speed Y1 to Y2 Condensing Unit OtoR See table 11 Two Speed Condensing Unit Single Speed Heat Pump Y1 to Y2 See table 11 Two Speed Heat Pump NONE See table 10 CBX32MV COOLING OPERATION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITH SignatureStat WITHOUT HARMONY UNIT JUMPERS THERMOSTAT DEMAND amp BLOWER SPEED Single Speed Y1 to Y2 Two Speed Single Speed Heat Pump Y1 to Y2 See table 12 Two Speed Heat Pump NONE See table 13 CBX32MV COOLING OPERAT
55. may cause extended compressor run times Refer to table 7 for jumpers per application CBX32MV units manufactured January 2002 and later will have factory installed jumpers Remove jumpers not used TABLE 7 JUMPERS REQUIRED DS to Y1 and Y1 to Y2 Two Speed DS to Y1 DS to Y1 and Single Speed Y1 to Y2 and Condensing OtoR Single Speed Heat Pump IESP Without CCB1 Humidity Control Unit n DS to Y1 and Two Speed OtoR Single Speed Y1 to Y2 Heat P midity Sinale Speed Y1 to Y2 and Control Condensing ingle Spee OtoR Unit Two Speed The CCB1 may become indefinitely latched in the dehumidification mode when power to the unit is turned off This condition can be caused by turning off power while dehumidification demand is present then turning on power when dehumidification demand is satisfied If the CCB1 becomes stuck in this manner it can be reset by removing thermostat demand then moving the CCB1 slide switch all the way down and back up to its setpoint How to unlatch CCB1 1 Force a cooling demand by setting thermostat to COOL mode and by moving thermostat lever to lowest position 2 Move 1 slide control down to 40 relative humidity CCB1 lights should come on 3 Now move CCB1 slide control back up to 6096 relative humidity The lights should go off 4 Remove thermostat demand by moving thermostat lever to cycle unit off Applications with the EfficiencyPlus CCB1 humidity control create
56. ng hand and all tools on unpainted unit surface before performing any service procedure 2002 Lennox Industries Inc Model Number Identification CB X 32 MV 036 230 6 05 Unit Type Minor Revision Number CB Air Handler Refrigerant Metering Device Refrigerant Type 2 Fixed Orifice X R 410A 3 TXV Bleedport indoor unit Series 4 TXV Non bleedport indoor unit 5 TXV Non bleedport outdoor unit Configuration 6 TXV R 410A Non bleedport indoor unit MV Multi Position Variable speed blower motor Voltage 230 208 230V 60hz 1ph Nominal Cooling Capacity 018 024 1 5 to 2 tons 5 3 to 7 kW 024 030 2 to 2 5 tons 7 to 8 8 kW 036 3 tons 10 6 kW 048 4 tons 14 1 kW 060 5 tons 17 6 kW 068 5 tons 17 6 kW Specifications General Data Model Number CBX32MV 018 024 CBX32MV 024 030 CBX32MV 036 Nominal cooling capacity tons kW 1 5 2 5 3 7 2 2 5 7 8 8 3 10 6 Refrigerant R 410A R 410A R 410A Connections Suction vapor line sweat 5 8 15 8 3 4 19 3 4 19 mo Liquid line sweat 3 8 9 5 3 8 9 5 3 8 9 5 Condensate drain fpt 2 3 4 19 2 3 4 19 2 3 4 19 Indoor Net face area ft 2 m2 3 56 0 33 4 44 0 41 5 0 0 46 sel Tube outside diameter in mm 3 8 9 5 3 8 9 5 3 8 9 5 Number of rows 3 3 3 Fins per inch fins per m 12 472 12 472 12 472 Blower Data Wheel nominal diameter x width in mm Motor output
57. ng has been determined chose the remainder speed jumper settings from those offered in the table in that row The TEST pin is available to bypass the BDC3 control and run the motor at approximately 70 to test that the motor is operational This is beneficial primarily in troubleshooting G must be energized for motor to run COOL The COOL jumper is used to determine the CFM during either 1 cooling or 2 heat pump operation without a call for electric heat These jumper selections are activated for cooling when Y2 and DS terminals in the CBX32MV are energized and for heating when Y2 is energized Applications without the Lennox SignatureStat or EfficiencyPlus CCB1 humidity control will provide 70 of the COOL CFM during first stage cooling for two speed outdoor units Units built prior to August 2002 will provide either 60 048 060 series units or 65 036 series units of the COOL CFM during first stage cooling for two stage outdoor units 100 of COOL speed is provided for systems with a single speed outdoor units NOTE For two speed heat pump units blower will operate at 60 65 or 70 of COOL CFM For single speed heat pump units blower will operate at 100 COOL CFM until supplemental electric heat is demanded At that time the blower will operate at HEAT speed selected This arrangement provides for warmer supply air during heat pump operation only HEAT The HEAT jumper is used to determine CFM dur
58. no field repairable parts and must be replaced when damaged in this manner Agents which can damage the CCB1 include alcohol benzene chlorine and chlorine based solutions acetone nail polish remover bug sprays and other household cleaners Calibration can also be adversely affected by the placement of the CCB1 with respect to the indoor thermostat exterior doors and windows and supply air registers Most thermostats have anticipation resistors Page 21 which give off heat If the CCBI is installed directly above the indoor thermostat the humidity sensor calibration will be thrown off If the CCB1 is installed directly above the indoor thermostat it should be relocated to the side of the thermostat Refer to CCB1 installation instructions Other Conditions Which Adversely Affect CCB1 Performance Blower speed selection can adversely affect 1 performance Higher blower speeds should be selected to provide maximum sensible cooling while lower blower speeds should be selected to provide maximum humidity removal Refer to CBX32MV and CCB1 installation instructions It is recommended that the indoor blower be left in AUTO mode at all times During dehumidification mode the indoor coil and drain pan may become saturated with moisture If the indoor blower is left in ON mode much of that moisture can be re evaporated into the living space between thermostat demands This can create a constant demand for humidity removal and
59. on Set unit so that it is level Connect return and supply air plenums as required using sheet metal screws See figure 18 UPFLOW CONFIGURATION HORIZONTAL DRAIN PAN UPFLOW DOWNFLOW DRAIN PAN im FOR OPTIMUM PERFORMANCE REMOVE HORIZONTAL DRAIN PAN FIGURE 18 C Downflow Application A WARNING If electric heat section with circuit breakers ECB29 is applied downflow CBX32MV unit the circuit breakers must be rotated 180 to the UP position See ECB29 installation instructions for more details top of unit The shields are used for downflow applications only and may need to be field fabricated if no longer with unit See table 14 for drip shields used 2 Remove coil assembly from unit 3 Remove horizontal drain pan See figure 19 TABLE 14 Lengi Wat Not CBX32MV 018 024 N A CBX32MV 024 03 LB 74274 15 875 4 6718 CBX32MV 036 LB 74272 17 875 4 6718 CBX32MV 048 060 LB 89864 19 875 4 6718 068 Page 28 DOWNFLOW DISCHARGE CONFIGURATION FOR OPTIMUM PERFORMANCE REMOVE HORIZONTAL DRAIN PAN DOWNFLOW DRAIN PAN FIGURE 19 4 Rotate cabinet 180 from upright It may be necessary to first remove the blower assembly to lighten the cabinet for lifting 5 Install downflow drip shield firmly in place on inside of coil slab from under drain pan See figures 20 and 21 side view 1 Apply two pieces of foam
60. onnectors Cable Half Air noise Check for loose blower housing panels etc If high static causing noise check for air whistling through seams in ducts cabinets or panels e Check cabinet duct for deformation 5 Pin Power AC Line connector AC Line Gnd Noisy Blower or cabinet Line 1 and 2 will be connected for 120 Vac applications only Motor failure has occurred and Replace motor and perform moisture check moisture is present 16 Pin Control 60 65 70 OF COOL SPEED Connector Out Outt Disconnect power to the unit Adjust G fan e Change delay pin setting on the BDC3 board to 1 E 24 Remove wires from terminal strips in control box Delav 24Vac R jumpers between R and Y1 and R Common 2 Heat W W1 DS Pwn Speed Common 1 O Rev Valve e Tum power to unit Blower should operate on 60 65 or 70 of cool speed e When check is complete disconnect power replace delav setting to original position FIGURE 6 Page 14 IV OPTIONAL ECB29 31 ELECTRIC HEAT A Matchups and Ratings Tables 4 5 and 6 show all approved CBX32MV to ECB29 matchups and electrical ratings B Electric Heat Components ECB29 parts arrangement is shown in figures 7 through 10 All electric heat sections consist of components mounted to the electric heat vestibule panel and electric heating elements exposed directly to the air stream
61. orizontal runs must be sloped 1 25mm per 10 feet 3 1m of drain line to offset friction 5 An open vent in drain line will sometimes be required due to line length friction and static pressure 6 Drains should be constructed in a manner to facilitate future cleaning and not to interfere with filter access See figure 30 7 Auxiliary drain should run to an area where homeowner will notice it draining Refer to local codes VII START UP OPERATION A Preliminary and Seasonal Checks 1 Make sure the unit is installed in accordance with the installation instructions 2 Inspect electrical wiring both field and factory installed for loose connections Tighten as required 3 Check voltage at disconnect switch Voltage must be within range listed on the nameplate If not consult the power company and have voltage condition corrected before starting unit 4 Check to ensure that refrigerant lines are in good condition and pipe insulation is intact 5 Inspect condition of condensate drain pan and piping assembly Disassemble and clean seasonally B Cooling Start Up NOTE The following is a generalized procedure and does not apply to all thermostat control systems Electronic thermostat control systems may operate differently 1 Set fan switch to AUTO or ON and move the system selection switch to COOL Adjust the thermostat to a setting far enough below room temperature to bring on the compressor Compressor will start and cycl
62. rangement provides for additional dehumidification during standard first stage cooling See tables 12 and 13 for various scenarios concerning use of the SignatureStat and the CBX32MV series unit For applications with Harmony zone control the blower CFM volume is determined by the Harmony control center This speed is not adjustable See footnotes in the blower tables table of contents Page 12 CBX32MV units built prior to Februarv 2003 1 PIN JUMPERED A Motor runs at 100 until demand is satisfied B Once demand is met motor ramps down to off A B OFF 100 CFM OFF 4 DEMAND 42 PIN JUMPERED A Motor runs at 82 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1 2 minutes B motor runs at 100 until demand is satisfied C Once demand is met motor ramps down to off B 7 1 2 82 COOLING DEMAND 100 CFM OFF OFF 3 PIN JUMPERED A Motor runs at 5090 for 1 2 minute B Motor then runs at 82 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1 2 minutes C Motor runs at 100 until demand is satisfied D Once demand is met motor ramps down to off D 7 1 2 MIN 82 CFM 100 CFM OFF 1 2 MIN 50 CFM COOLING DEMAND 4 PIN JUMPERED A Motor runs at 5090 for 1 2 minute B Motor then runs at 82 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1
63. ries Inc Litho U S A G ECB29 8 10 15CB 208 230V THREE PHASE SEQUENCE OF OPERATION 1 When there is a call for heat W1 of the thermostat energized see unit schematic figure 26 energizes the electric heat relays K32 and K33 with 3 When K32 1 K32 2 and K33 2 closes assuming the AG N C primary S15 and secondary S20 limit switches 2 When K32 1 and or K33 1 closes the blower is energized are closed electric heat elements HE1 HE2 and HE3 on heating speed and economizer heat relay K20 2 is are energized Page 39 COMPONENT ARRANGEMENT RCUIT BREAKERS NIT RT I CRT REAKER ELECTRIC HEAT 40A BREAKER ELECTRIC HEAT IRIC HEA LECTRIC HEA LECTRIC HEA HEAT LAY SEQUENCER ELECTRIC HEAT LAY SEQUENCER ELECTRIC HEAT LAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT SWITCH LIMIT PRIMARY AUTO SWITCH LIMIT SECONDARY AN CIRCUIT 2 u 2 L3 lt CB2 v M EQUIPMENT lt q GROUND B LN REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE
64. screws F Condensate Drain A 5 127mm section of PVC pipe is provided with the unit Cut the pipe in half and use to route the auxiliary and main drains Connect main condensate drain and route downward to an open drain or sump Do not connect drain to a closed waste system Refer to figure 30 for typical condensate trap configuration TYPICAL CONDENSATE DRAIN CONNECTION PIPE DIAMETER DIFFERENCE MINIMUM 4 INCH 25 mm PITCH PER 10 FEET 3048 mm OF LINE Trap must be deep enough to offset maximum static difference Generally 2 inches 51mm minimum FIGURE 30 It is recommended that the auxiliary drain be connected toa drain line for all units If auxiliary drain is not connected it must be plugged with provided cap For downflow units the auxiliary drain MUST be connected and routed to a drain See figure 31 for auxiliary and main drain locations RIGHT HAND DISCHARGE LEFT HAND DISCHARGE UPFLOW OR DOWNFLOW AUXILIARY DRAIN ON LEFT FIGURE 31 MAIN DRAIN ON RIGHT The following practices are recommended to ensure condensate removal 1 Drain piping should not be smaller than the drain connections at drain pan 2 A trap must be installed in the main drain line 3 The trap must be deep enough to offset the difference in static pressure between drain pan and atmosphere Generally two inches is satisfactory for medium static applications 4 H
65. setpoint to be adjusted within that comfort range 50 RH is the recommended initial setpoint until personal comfort level is established The personal comfort level will vary with humidity as with temperature For example if air at 75 F and 50 RH is changed to 60 RH the air will feel much warmer Likewise if the air is reduced to 4096 RH it will feel much cooler Even when inactive the body evaporates a large amount of moisture away from the skin This evaporation produces a cooling effect during wintertime this phenomenon is called wind chill Dry air is capable of absorbing more moisture away from the skin thereby increasing the cooling effect When the CCB1 senses that the indoor humidity level is above the control setpoint the control places the CBX32MV and outdoor unit in a dehumidification mode To produce drier air the CBX32MV will slow down the speed of the air crossing the indoor coil Because the air is moving much slower than normal the indoor coil is allowed more time to remove moisture from the air a higher percentage of the air passing over the coil is cooled to its dew point removing more moisture At the same time the two speed outdoor unit will switch to high speed to produce a colder indoor coil The colder indoor coil and slower moving air combine to produce drier supply air NOTE The indoor blower speed is reduced in order to slow the air speed across the indoor coil The supply air exiting the
66. sired set of pins The following section outlines the different jumper selections available and conditions associated with each one Refer to figure 5 for identification After the CFM for each application has been determined the jumper settings must be adjusted to reflect those given in the blower data tables at the front of this manual From the tables determine which row of CFM volumes most closely matches the desired CFM Once a specific row has been chosen NORMAL or CFM volumes from other rows cannot be used Below are the descriptions of each of the jumper selections Page 11 BDC3 VARIABLE SPEED CONTROL SELECTIONS JP1 15 PIN PLUG BOARD TO MOTOR DIAGNOSTIC DS LEDS ACCESSORY RELAY CONTACTS DRIVES OPTIONAL ACCESSORY RELAY OPERATIONAL m 4 SELECTOR PINS Paro jew 3 Affects both heating TESTES and cooling modes ADJUST HEAT COOL COOLING SPEED HEATING SPEED SELECTOR PINS SELECTOR PINS FAN DELAY SELECTOR PINS FIGURE 5 ADJUST The ADJUST pins allow the motor to run at normal speed approximately 10 higher or approximately 10 lower than normal speed The blower tables give three rows NORMAL and with their respective CFM volumes Notice that the normal adjustment setting for heat speed position 3 is 1315 CFM The adjustment setting for that position is 1445 CFM and for the adjustment setting is 1185 CFM After the adjustment setti
67. tape provided down both ends of each shield The tape should measure 4 3 4 X 2 120 X 25 mm Ensure that the tape covers both sides of the shield equally 2 Apply the longer piece of foam tape between the pieces on each end This piece of tape is 1 wide FIGURE 20 DOWNFLOW DRIP SHIELDS N Drip Shield FIGURE 21 6 Replace coil assembly and blower if removed Replace coil access panel If horizontal drain pan is not removed depress tab in cabinet support rail to hold horizontal drain pan in place See figure 19 7 Set unit so that it is level Connect return and supply air plenums as required using sheet metal screws NOTE For downflow application metal or class supply and return air plenums must be used For downflow installation on combustible flooring an additive base must be used See figure 22 7 PROPERLY SIZE FLOOR OPENING Dd FIGURE 22 Cut an opening appropriatelv sized for combustible base Base dimensions are shown in figure 23 After opening has been cut set the additive base into opening Connect outlet air plenum to the additive base Set the unit on the additive base so flanges of the unit drop into the base opening and seal against the insulation strips Seal around the insulation strips with permagum The unit is now locked in place Install return air plenum and secure with sheet metal screws COMBUSTIBLE FLOOR ADDITIVE BASE Page 29 DOWNF
68. ting cooling season the svstem should be checked as follows A Filters A IMPORTANT Filter access panel must be in place during unit operation Excessive warm air entering the unit may result in water blow off problems remove filter loosen the thumb screws holding the filter panel in place Slide filter out of the guides on either side of cabinet insert new filter and replace panel Some models come with a spacer so standard size filters can be used Filters should be inspected monthly and must be replaced when dirty to ensure proper blower coil operation See table 15 for replacement filter sizes or see the sticker located on the filter access door specifying the size of the standard throw away filter which is used with the unit TABLE 15 CBX32MV FILTER SIZES CBX32MV018 024 15 X 20 381mm X 508mm CBX32MV 024 030 20 X 20 508mm X 508mm CBX32MV 036 20 X 22 508mm X 599mm CBX32MV 048 060 20 X 24 508mm X 610mm CBX32MV 068 20 X 25 508mm X 635mm B Supply Air Blower 1 Check and clean blower wheel 2 Motors are pre lubricated for extended life no further lubrication is required C Electrical 1 Check all wiring for loose connections 2 Check circuit breaker located in unit control box 3 Check for correct voltage at unit unit operating 4 Check amp draw using a True root mean square RMS amperage meter Typical clamp on ammeters do not read current accur
69. unit may not feel as forceful This is normal Remember that when the unit is in dehumidification mode the comfort level is increased because the unit is producing cooler drier air The exact sequence of operation to produce cooler drier air is described in the following section Operation The CCB1 operates only during cooling mode During normal cooling operation when there is no indoor humidity demand the unit operates as a straight two speed cooling System First stage thermostat demand energizes the compressor and indoor blower on low speed Increased cooling demand energizes the compressor and indoor blower on high speed The control is equipped with a row of orange LED lights on its face which indicate the amount of relative humidity demand present When one or more LEDs are lit the control signals the CBX32MV to begin dehumidification mode Tables 10 and 11 shows system response to thermostat and CCB1 demand Calibration Precautions Extreme care should be taken to avoid exposing the CCB1 to fumes from household chemicals The humidity sensing element in the CCB1 is a precise component which can be damaged or the calibration changed by household chemicals and cleaning agents Make sure all household chemicals are stored in a different room in the building Also use only mild diluted soapy water when cleaning the CCB1 cover or the area surrounding the CCB1 The sensing element cannot be field calibrated The CCB1 contains
70. upport rail Remove downflow rail then replace screws Also seal around the exiting drain pipe liquid and suction lines to prevent infiltration of humid air RIGHT HAND DISCHARGE CONFIGURATION HORIZONTAL DRIP SHIELD 068 MODELS UPFLOW DOWN FLOW A PAN HORIZONTAL DOWNFLOW DRAIN PAN RAIL No Adjustment Is Necessarv FIGURE 24 HANGING HORIZONTAL UNIT Electrical Inlet Clearance 4 in 102 mm 1 2 13mm Screws max ANGLE IRON SHEET METAL FRONT VIEW FIGURE 25 A CAUTION END VIEW Danger of equipment damage and personal injurv Take care when removing coil assembiv from unit installed in right or left hand applications Coil may tip into drain pan once clear of cabinet Sup port coil when removing Page 30 E Horizontal Left Hand Discharge Application NOTE For horizontal applications above the ceiling a secondarv drain pan is recommended Refer to local codes 1 Remove access panels and horizontal drip shield 068 model from the corrugated padding between the blower and coil assembiv Discard the corrugated padding and the downflow drip shields from the foam pads on top of the unit The shields are used for downflow applications only 2 Pull the coil assembly from unit Pull off the horizontal drain pan 3 Remove drain plugs from back drain holes on horizontal drain pan and re install them on front holes 4 Rotate drain pan 180 front to b
71. varies up and down or intermittent e Check svstem controls thermostat See Figure 6 Perform moisture check e The motor connects directly to the line Motor Hunts or If removing panel or filter reduces Puffing 3 RAM ctor 119V Puffs at high CFM reduce restriction or reduce max airflow e Make sure power is off before inserting power e Check low voltage thermostat wires and connector Stays atlow connections Plug is polarized despite system call e Verify fan is not in delay mode for cool or heat CFM Check R missing not connected to motor See Figure 6 Perform motor check Notes on 16 Pin Control Connection e Control functions G Y1 Y2 may be active at greater than 5 x control transformer voltage Do not apply 24vac to either Out pin 8 or16 e High voltage on control pins will destroy motor e Make sure pins are fully seated in connector and Current leakage from controls into G Y or housing Blower will not shut W e Verify common connection from transformer C off e Check for Triac switched thermostat or solid to C1 C2 Pin 1 and Pin 3 state relay e Once common is verified test motor by applying 24vac R to control pins Check R connection at motor Stavs at high CFM Check fan delav wait until complete Perform motor check Check for proper airflow setting Check replace filter Use low pressure drop filter Check correct duct restrictions Motor C
72. ver setpoint 2 or more Over setpoint 1 or more 60 65 70 of COOL stat demands unit off cvcle Change to Acceptable None Compressor demand and indoor blower speed follow thermostat demand Dehumidification mode begins with next thermostat demand after initial thermo stat demand is satisfied If humidity increases significantly over set point or if slide switch is moved significant ly unit will immediately go into dehumidifi cation mode in presence of thermostat de mand When humidity demand is satisfied blower immediately shifts to the COOL CFM in order to hasten the end of the cycle Unit can only shift out of high speed compressor operation at begin ning of next cycle Blower immediately changes speed in response to thermostat demand Dehumidification mode high speed com pressor begins with next thermostat de mand after initial demand is satisfied Reduced blower speed dehumidification speed begins imme diately with thermostat demand If humidity increases significantly over setpoint or if slide switch is moved unit immediately goes into dehumidification mode in presence of thermostat de mand While unit is not operating no thermo stat demand slide switch is moved down and back up Blower and com pressor operate at high speed until next thermostat demand Note When changing unit mode of operation from cooling to heating indicating l

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