Lennox CBX32MV-018/024 Manual
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Lennox CBX32MV-018/024 Manual

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Service Literature
CBX32MV (HFC-410A) SERIES UNITS (iComfort
NOTICE
A thermostat is not included and must be ordered
separately.
D A Lennox iComfort
®
communicating applications.
D In
non-communicating
®
ComfortSense
7000 thermostat may be used, as well
as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
Field wiring for both communicating and non-
communicating applications is illustrated in diagrams,
which begin on page 24.
WARNING
Improper installation, adjustment, alteration, service or
Maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take care
while handling this equipment and use protective cloth­
ing.
Revised April 7, 2015
thermostat must be used in
applications,
the
Lennox
Corp. 1005-L2

TABLE OF CONTENTS

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Upflow/Downflow Unit Dimensions
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Error Code Recall Mode
Operation
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Maintenance
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This indoor unit is designed for installation with optional
field-installed electric heat and a matched remote outdoor
unit that is charged with HFC-410A refrigerant. These units,
designed for indoor installation in multiple positions, are
completely assembled for upflow and horizontal right-hand
discharge before being shipped from the factory.
All CBX32MV air handlers are equipped with a
factory-installed, internally mounted check expansion
valve (CTXV), which is suitable for use in HFC-410A
applications.
This air handler is compatible with the ComfortSense® 7000
non-communicating thermostat and non- communicating
outdoor units. In addition, newer model units have the
enhanced capability of communicating with iComfort
thermostats and compatible outdoor units using the Lennox
RSBus protocols.
NOTE - For downflow or horizontal left-hand air discharge,
certain field modifications are required.
This document provides information only on the
CBX32MV-XXX-230-6-06 and later which features the new
iComfortt-enabled hardware. Refer to Corp. 0206-L3 for
earlier model service related information.
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CBX32MV
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Summary of Contents for Lennox CBX32MV-018/024

  • Page 1 Installation and service must be performed by a licensed ® enhanced capability of communicating with iComfort professional installer (or equivalent) or a service agency. thermostats and compatible outdoor units using the Lennox RSBus protocols. NOTE - For downflow or horizontal left-hand air discharge, CAUTION certain field modifications are required.

  • Page 2: Specifications

    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) in.

  • Page 3: Model Identification

    First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the same second­stage COOL speed selected, minimum 250 cfm. Lennox Harmony III™ Zone Control applications - minimum blower speed of 250 cfm. CBX32MV‐018/024 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures - in.
  • Page 4 First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the same second­stage COOL speed selected, minimum 250 cfm. Lennox Harmony III™ Zone Control applications - minimum blower speed of 250 cfm. CBX32MV‐024/030 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures - in.
  • Page 5 First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the same second­stage COOL speed selected, minimum 250 cfm. Lennox Harmony III™ Zone Control applications - minimum blower speed of 250 cfm. CBX32MV‐036 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures - in.
  • Page 6 First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the same second­stage COOL speed selected, minimum 450 cfm. Lennox Harmony III™ Zone Control applications - minimum blower speed of 450 cfm. CBX32MV‐048 AND CBX32MV‐060 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures - in.
  • Page 7 First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the same second­stage COOL speed selected, minimum 450 cfm. Lennox Harmony III™ Zone Control applications - minimum blower speed of 450 cfm. CBX32MV‐068 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures - in.
  • Page 8 CBX32MV‐068 BLOWER MOTOR WATTS AT NORM SETTING (Adjust Jumper at NORM Setting) Motor Watts @ Various External Static Pressures - in. wg. (Pa) Jumper 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) Tap 1...

  • Page 9: Electric Heat Data

    Electric Heat Data ELECTRIC HEAT DATA - CBX32MV-018/024 AND CBX32MV-024/030 SINGLE PHASE ELECTRIC HEAT CBX32MV-018/024 CBX32MV-024/030 Minimum Maximum Circuit Overcurrent Blower Minimum Maximum Ampacity Protection No. of Volts Btuh Motor Model Number Circuit Overcurrent Stages Input Input Input Full Load...
  • Page 10 ELECTRIC HEAT DATA - CBX32MV-036 SINGLE PHASE ELECTRIC HEAT CBX32MV-036 Maximum Minimum Circuit Overcurrent Ampacity Blower Mo­ Protection No. of Volts Btuh In­ Model Number tor Full Load Stages Input Input Circuit Circuit Amps ECB40−4 (55W89) 4 kW 10,250 - - - - - - Terminal Block 4 lbs.
  • Page 11 ELECTRIC HEAT DATA - CBX32MV-036 (Continued) THREE PHASE ELECTRIC HEAT CBX32MV-036 Maximum Minimum Circuit Overcurrent Ampacity Blower Mo­ Protection No. of Volts kW In­ Btuh In­ Model Number tor Full Load Stages Input Circuit Circuit Amps ECB40−20CB (35W01) 20 kW 15.0 51,200 (2) 35A Circuit breaker...
  • Page 12 20 kW ECB40-20CB (34W96) 15.0 51,200 - - - - - - 19 lbs. (2) 60A Circuit breaker 16.8 57,300 - - - - - - 18.4 62,700 - - - - - - 20.0 68,200 - - - - - - 25 kW ECB40-25CB (34W97) 18.8...
  • Page 13 CBX32MV Upflow and Downflow Unit Dimensions — Inches (millimeters) PIPING PLATE DETAIL 3/4 (19) (FOR UPFLOW AND DOWNFLOW POSITIONS) 5/8 (16) SUPPLY AIR OPENING 4‐3/8 (111) 1‐1/8 (29) SUCTION LINE CONDENSATE DRAINS 5/8 (16) 5/8 (16) (2) (HORIZONTAL) 3/4 (19) RETURN (51) LIQUID LINE...
  • Page 14 CBX32MV Horizontal Left- and Right-Hand Unit Dimensions — Inches (mm) 5‐3/8 FILTER (137) (51) LIQUID Horizontal Position LINE (Right‐Hand Air SUCTION CONDENSATE LINE DRAINS (2) Discharge) (UPFLOW AND DOWNFLOW) COIL BLOWER 1‐1/8 (29) CONDENSATE 4‐3/8 DRAINS (2) (HORIZONTAL) (111) FOR DIMENSIONS “A” THROUGH “H”, SEE CHART ON PAGE 13.

  • Page 15: Installation Clearances

    Requirements In addition to conforming to manufacturer's installation Installation Clearances instructions and local municipal building codes, installation of Lennox air handler units (with or without optional electric Cabinet 0 inch (0 mm) heat), MUST conform with the following National Fire...
  • Page 16 DOWNFLOW RAIL that is at least 14” from the floor to allow for proper air NO ADJUSTMENT IS NECESSARY return. Lennox offers an optional upflow unit stand as listed in Table 1. Figure 2. Right-Hand Discharge Configuration Table 1. Optional Unit Side Stand (Upflow Only) 5.
  • Page 17 TOP CAP DETAIL C TOP CAP ROTATED TO SCREWS CORRECT POSITION CABINET SUPPORT 3/16” PLASTIC PLUG (REAR COIL END SEAL) 90º BEND HORIZONTAL DRIP SHIELD SCREW (FRONT COIL END SEAL) DRAIN PAN SHIPPING DRAIN PAN LOCATION REINSTALLED HERE INSTALL DRAIN PAN BETWEEN TAB AND EXTERIOR INNER WALL.
  • Page 18 9. Rotate top cap 180º front‐to‐back and align with CAUTION unused screw holes. Holes must align with front and back coil end plates. The top cap has a 45º bend on one If electric heat section with circuit breakers side and a 90º bend on the other. The 90º bend must be (ECB29/ECB31) is applied to downflow CBX32MV on the same side as the horizontal drain pan as unit, the circuit breakers must be rotated 180°...

  • Page 19: Brazing Connections

    HORIZONTAL DRAIN PAN HANDER (REMOVE FROM UNIT) UNIT UP-LOAD / DOWNFLOW DRAIN PAN COMBUSTIBLE FLOOR ADDITIVE BASE PROPERLY SIZED FLOOR OPENING Figure 9. Combustible Flooring Additive Base Figure 6. Downflow Discharge Position 8. For downflow installation on combustible flooring, an additive base must be used as illustrated in figure 9 on page 19.
  • Page 20 IMPORTANT WARNING Danger of fire. Bleeding the refrigerant To prevent the build up of high levels of nitrogen when charge from only the high side may result purging, be sure it is done in a well ventilated area. Purge in the low side shell and suction tubing low pressure nitrogen (1 to 2 psig) through the refrigerant being pressurized.
  • Page 21 PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING OPERATIONS ON PAGE 10 BEFORE PROCEEDING. USE A WET RAG TO PROTECT CTXV SENSING BULB WHEN BRAZING SUCTION LINE CONNECTIONS. NOTE — REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR REFRIGERANT PIPING SIZE REQUIREMENTS. NOTE - Use silver alloy brazing rods with five or six percent minimum silver alloy for copper-to-copper brazing, 45 percent alloy for copper-to-brass and copper-to-steel brazing.

  • Page 22: Condensate Drain Requirements

    Overflow drain line should run to an area where NOTE - When installing refrigerant lines longer than 50 homeowner will notice drainage. feet, see the Lennox Refrigerant Piping Design and It is recommended that the overflow drain line be Fabrication Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance.

  • Page 23: Inspecting And Replacing Filters

    METERS) LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90. PIPE NIPPLE PROVIDED IN BAG ASSEMBLY - SCH 80, 3/4” I. D. X 5” - 34K7401 (1): CUT THE PIPE IN HALF AND USE IT TO ROUTE THE MAIN DRAIN.

  • Page 24: Field Control Wiring

    Make sure the liquid line and suction line entry points are Select proper supply circuit conductors sealed with either the provided flexible elastomeric thermal accordance with Tables 310-16 and 310-17 in the insulation, or field provided material (e.g. Armaflex, National Electric Code, ANSI/NFPA No. 70 or Tables 1 Permagum or equivalent).
  • Page 25 Air Handler or Furnace Control É É É É É É É É É É É É É É É É É É Heat Pump or Air Conditioner Control É É É É É É É É É É É É...
  • Page 26 COMFORTSENSE CBX32MV T 7000 AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 20 FOR HEAT SECTION CONFIGURATION. CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # CONDITIONER 47W97) IS REQUIRED WHEN CONNECTING THE UNIT COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2.
  • Page 27 OUTDOOR IMPORTANT — USE CARE WHEN CUTTING LINKS TO SENSOR PREVENT DAMAGE TO CONTROL. SEE FIGURE 19, (X2658) CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS. EDA UNIT CONNECTED ON UNIT WITH LSOM. RELAY RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2.
  • Page 28 Label Label Function 24VAC Outdoor Air Sensor This is a two screw terminal for connection to a Lennox RSbus data high connection X2658 outdoor temperature sensor. The Control takes no Thermostat RSbus data low connection action on the sensor status other than to communicate the 24VAC command (ground) temperature to the RSBus network.
  • Page 29 H (Output) The H terminal provides a 24VAC output for humidification needs in both communicating and non-communicating mode . The L terminal is provided for connection to devices with Lennox System Operation Monitor (LSOM) capabilities. The control L (Input) interprets the fault signals and transmits them as an alarm message on the communication line. There are ten (10) identified LSOM fault codes.
  • Page 30 2-STG COMPRESSOR 1-STG COMPRESSOR JUMPER & LINK GUIDE DO NOT CUT CUT LINK COOLING MODE HEATING MODE BLOWER SPEED BLOWER SPEED (COOLING & HP MODE) (ELECTRIC HT MODE) A/C UNIT HEAT PUMP UNIT HIGH HIGH DO NOT CUT CUT LINK SPEED SPEED 1 2 3 4...

  • Page 31: Air Handler Control Button, Display And Jumpers

    NOTE - Optional Discharge Air Temperature Sensor, Air Handler Control Button, Display and Lennox Catalog # 88K38 is REQUIRED for EVENHEAT Jumpers operation and must be ordered separately. Use Figure 19 as reference for jumper settings. If any of the 3.
  • Page 32 Delay Profile 2 When cool demand is initiated, motor ramps up to Cooling — Air Conditioner and Heat Pump: Motor runs at 82% for approximately 7.5 minutes and then ramp up to 100% (unless the demand has 100% CFM 100% CFM been satisfied) and motor runs at 100% until COOL­...
  • Page 33 Table 11. AHC Configuration, Test and Error Recall (Fault and Lockout) Function NOTE — AHC MUST BE IN IDLE MODE) Single Character LED Action Display Solid Push and hold button until solid appears, release button. Display will blink. Blinking Push and hold button until required symbol displays CONFIGURING ELECTRIC HEAT SECTIONS Release push button - control will cycle the indoor blower motor on to the selected heat speed and stage the electric Solid...
  • Page 34 Table 12. AHC Control Single Character Display Alert Codes (Communicating and Non-Communicating) Alert Alert How to Clear Priority Code Equipment is unable to communicate. This may indicate the existence of other alarms / codes. In most cases errors are related to electrical noise. Make sure high voltage E105 The air-handler has lost communica­...
  • Page 35 Table 12. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (continued) Alert Alert How to Clear Priority Code The O relay on the air-handler has fai­ E345 led. Either the pilot relay contacts did O relay failed. Pilot relay contacts did not close or the relay coil did not energize. Re­ Critical place control.

  • Page 36: Configuring Unit

    Configuring Unit This section identifies the requirements for configuring the air handler unit for unit size, heat mode selection and EvenHeat. Air Handler Control Checkout Power-up - Unit Size Code (Number or letter) displayed represents air handler model size and capacity.
  • Page 37 PUSH and HOLD button next to single Turn room thermostat to character LED display until dash symbol appears, RELEASE button. UNIT SIZE AIR HANDLER CODE MODEL CBX32MV-018/024 CBX32MV-024/030 Solid dash starts blinking on single character LED CBX32MV-036 display. CBX32MV-048 CBX32MV-060 CBX32MV-068...
  • Page 38 Configuring/Detecting Electric Heat Sections IMPORTANT — All electric heat installations require the Air Handler Control (AHC) to be manually configured to detect number of heat sections. NOTE — All field replacement AHC will require configuring/detecting electric heat sections. RECOMMEND — USE FIGURE 19 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
  • Page 39 EVENHEAT OPERATION INPUTS OUTPUTS Target Discharge Air Target Discharge Air Target Discharge Air Room Thermostat Demand Temperature Set at 85ºF Temperature Set at 100ºF Temperature Set at 115ºF/130ºF Heat Pump First + First Electric Heat Pump First Stage Heat Pump First Stage Heat Section (H1) Heat Pump First and Second Stage + First Electric Heat Section...
  • Page 40 Note 1 Activation delay EVENHEAT Operation 120 seconds if one heat stage is or deactivated 150 seconds if more than one stage is activated or deacti­ vated. Start Timer Delay (Note 1) Activate Y2 Change in Heat demand from room thermostat? Delay Timer Delay Timer Finished or last...
  • Page 41 Heat Pump Operation (Heating and Cooling) Air Handler Control Indoor Blower Mode Speed and Profiles settings Set Cooling Mode Blower Speed jumper pin . (Low and high indoor blower CFM settings are identical for Y1-Y2 CUT ON-BOARD LINK cooling and heat pump) 2-STAGE Y1-Y2 FOR COMPR...

  • Page 42: Cooling Operation

    Cooling Operation Air Handler Control Indoor Blower Mode Speed and Profiles settings Set Cooling Mode Blower Speed jumper pin. Y1-Y2 Set Cooling Mode Blower Ramping jumper pin. CUT ON-BOARD LINK Y1-Y2 FOR 2-STAGE Set Blower Adjust Selection jumper pin. COMPR TWO-STAGE A/C Single or Two-Stage Unit Control on-board link must be cut between Y1 and Y2 to allow 2 stage...

  • Page 43: Error Code Recall Mode

    Error Code / Recall Mode Control in Idle Mode (No heating cooling or indoor fan operation) To enter Error Code Mode, Turn room thermostat to OFF push and hold button next to single character LED display until solid E symbol appears, release button.

  • Page 44: Indoor Blower Test

    Indoor Blower Test Indoor Blower Test Mode Control in Idle Mode (No heating cooling or indoor fan operation) To enter blower test mode, push and hold button next to single character LED display until — (Solid bar), then release button. Turn room thermostat to Push and hold button until the solid A symbol is displayed on the...

  • Page 45: Operation

    If the selector switch on the thermostat is set to the 1. Clean or change filters. emergency heat position, the heat pump will be locked out of the heating circuit, and all heating will be electric heat (if 2. Lennox blower motors prelubricated applicable).

  • Page 46: Cabinet Insulation

    3. Adjust blower speed for cooling. Measure the pressure temperature/humidity difference between the inside and drop over the coil to determine the correct blower CFM. outside of the cabinet can cause condensation on the Refer to the unit information service manual for pressure inside or outside of the cabinet which leads to sheet metal drop tables and procedure.

  • Page 47: Sequence Of Operations

    Sequence of Operations CBX32MV - 208/230V SINGLE PHASE 1. Line voltage is routed to transformer T1 and blower motor B3. 2. T1 supplies 24VAC to terminal strip TB2, which supplies 24VAC to the indoor thermostat and electric heat, if used. HEATING 1.
  • Page 48 Table 13. Cooling Operation and Jumper Summary CBX32MV COOLING OPERATION AND JUMPER SUMMARY (OPTIONAL ACCESSORIES) WITHOUT ® ComfortSense 7000t WITHOUT HARMONY IIIt THERMOSTAT UNIT JUMPERS BLOWER SPEED DEMAND DS to R Single Speed Condensing Unit Y1 to Y2 COOL O to R 70% of COOL DS to R Two Speed Condensing Unit...
  • Page 49 This section details unit operating sequence for non-communicating systems. NOTE - For communicating systems, see the iComfortt thermostat installation instruction. Table 14. CBX32MV with ComfortSenset 7000 Thermostat and Single-Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity System Handler...
  • Page 50 Table 14. CBX32MV with ComfortSenset 7000 Thermostat and Two‐Stage Outdoor Unit Operating Sequence (continued) Operating Sequence System Demand System Response Thermostat Demand Relative Humidity Handler System Compre Condition Status ssor Step (COOL) Comments Room Thermostat Calls for First- and Second-Stage Cooling BASIC MODE (Only active on a Y1 thermostat demand) ComfortSenset 7000 ther­...
  • Page 51 ECB40-2.5, 4, 5 and ECB40-4CB, 5CB 208/230V Single Phase 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized. Page 51 CBX32MV...
  • Page 52 ECB40-6 and ECB40-6CB 208/230V Single Phase 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized. Page 52 CBX32MV...
  • Page 53 ECB40‐8 and ECB40-8CB - 208/230V Single Phase FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized. SECOND-STAGE HEAT (remove jumper between W2 and R) 1.
  • Page 54 ECB40‐9CB - 208/230V Single Phase FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized. SECOND-STAGE HEAT (remove jumper between W2 and R) 1.
  • Page 55 ECB40-12.5CB, ‐15CB - 208/230V Single Phase FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized. SECOND-STAGE HEAT(remove jumper between W2 and R) 1.
  • Page 56 ECB40‐20CB - 208/230V Single Phase FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 and K33 relays. K32-1 and K33-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE1 and HE3 are energized.
  • Page 57 G ECB40‐25CB - 208/230V Single Phase FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 and K34 relays. K32-1 and K34-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE1 and HE2 are energized.
  • Page 58 ECB40-8, 10 and ECB40‐15CB - 208/230V Three Phase FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized. SECOND-STAGE HEAT (remove jumper between W2 and R) 1.
  • Page 59 ECB40‐20CB, ECB25CB - 208/230V Three Phase FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 and K34 relays. K32-1 and K34-1 closes. 2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE1 and HE2 are energized.

  • Page 60: Unit Components

    Unit Components DETAIL A THE AIR HANDLER CONTROL HAS TWO SCREW TERMINALS MARKED DISCHARGE AIR SENSOR. THE SENSOR IS REQUIRED FOR EVENHEAT OPERATION, IS FIELD-INSTALLED AND MUST BE ORDERED SEPARATELY (CATALOG # 88K38). DISCHARGE SENSOR (DAT) 5-1/2 IN. ELECTRIC HEAT RELAY (140 MM) PART NO.
  • Page 61 O and Y1 to Y2. These links will have to be removed in separately, use Lennox Catalog # 88K38. certain unit application. See table 16. In the EvenHeater mode, the discharge air sensor cycles Table 16.
  • Page 62 Reset controller by momentarily turning off power to unit. Earlier ECM motors used on other Lennox air handler models are not interchangeable with motors used on the The DC filter capacitors inside the controller are connected CBX32MV line.
  • Page 63 P48 5 PIN P48 5 PIN P49 4 PIN P49 4 PIN MOTOR with INTEGRATED CONTROLLER J48 5 Pin P48 5 Pin J49 4 Pin P49 4 Pin J48 5 Pin Line Voltage Connector J49 4 Pin Control Connector J48 Connector 120v Figure 30.
  • Page 64 INDOOR BLOWER MOTOR (B3) CONTROL CONTROL MODULE TROUBLESHOOTING (EMERSON) 3-PIN JACK 1. Disconnect three-wire harness from motor control module. If the plug terminals inside the module are damaged. If terminals are not damaged, proceed to next step. 2. Inspect the negative temperature coefficient (NTC) thermistor (see figure 33) for any cracks or breakage.
  • Page 65 P48 (5-PIN) P49 (4-PIN) CONTROL MODULE MOTOR J48 5 Pin Line Voltage Connector P48 5 Pin P49 4 Pin J49 4 Pin Control Connector Figure 35. Indoor Blower Motor (B3) Control Connections (Emerson) P48 (5-PIN) HARNESS P49 (4-PIN) HARNESS P48 (5-PIN) HARNESS P49 4 Pin CONTROL MODULE...

  • Page 66: Electric Heat (Ecb40)

    P48 (5-PIN) HARNESS P49 (4-PIN) HARNESS P48 (5-PIN) HARNESS J49 4 Pin CONTROL MODULE MOTOR J49 Connector 24v Transformer Figure 37. J49 Test (Emerson) 3. Terminal Strip (TB2) Optional Electric Heat (ECB40) For the electric heat sections without circuit breakers or A-MATCHUPS AND RATINGS fuses, line voltage connections are made to terminal strip The tables on the following pages show all approved...
  • Page 67 ECB40-9CB P VOLTAGE SHOWN Elements HE1 and HE2 Primary Limit S15 and Relay K33 Secondary Limit S20 Location of CB1 Relay K32 Figure 38. Electric Heat Page 67 CBX32MV...

This manual is also suitable for:

Cbx32mv-024/030Cbx32mv-060Cbx32mv-068Cbx32mv-036Cbx32mv-048

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