Lennox CBX32MV Series Manual
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Lennox CBX32MV Series Manual

Lennox CBX32MV Series Manual

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Service Literature
CBX32MV (HFC−410A) SERIES UNITS (icomfortt ENABLED)
NOTICE
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Touch™ thermostat must be used
in 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
operation.
Field
wiring for both communicating and non−
communicating applications is illustrated in diagrams,
which begin on Page 23.
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.

TABLE OF CONTENTS

Revised March 29, 2011
applications,
the
Lennox
Corp. 1005−L2
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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, new model units have the enhance
capability of communicating with the icomfort Toucht
thermostat 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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2010 Lennox Industries Inc.
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Summary of Contents for Lennox CBX32MV Series

  • Page 1: Table Of Contents

    This indoor unit is designed for installation with optional separately. field−installed electric heat and a matched remote outdoor D The Lennox icomfort Touch™ thermostat must be used unit that is charged with HFC−410A refrigerant. These units, designed for indoor installation in multiple positions, are in communicating applications.

  • 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 setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony IIIt Zone Control applications − minimum blower speed is 300 cfm (145 L/s) CBX32MV-018/024 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures −...
  • Page 4 First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony IIIt Zone Control applications − minimum blower speed is 300 cfm (145 L/s) CBX32MV-024/030 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures −...
  • Page 5 First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony IIIt Zone Control applications − minimum blower speed is 300 cfm (145 L/s) CBX32MV-036 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures −...
  • Page 6 First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony IIIt Zone Control applications − minimum blower speed is 300 cfm (145 L/s) CBX32MV-048 AND CBX32MV-060 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures −...
  • Page 7 First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony IIIt Zone Control applications − minimum blower speed is 300 cfm (145 L/s) CBX32MV-068 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting) Motor Watts @ Various External Static Pressures −...
  • 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 Circuit Circuit Ampacity...
  • 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 Amps Circuit Circuit ECB40−4 (55W89) 4 kW 10,250 − − − −...
  • 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 Amps Circuit Circuit ECB40−20CB (35W01) 20 kW 15.0 51,200 19 lbs.
  • 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: Upflow/Downflow Unit Dimensions

    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 OPENING...

  • Page 14: Horizontal Lh/Rh Unit Dimensions

    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

    (CFCs, HCFCs and HFCs) as of July 1, 1992. of Lennox air handler units (with or without optional electric Approved methods of recovery, recycling or reclaiming heat), MUST conform with the following National Fire must be followed.

  • Page 16: Installation Requirements

    3. Install units that have no return air plenum on a stand APPLICATION IN HIGH HUMIDITY AREAS that is at least 14" from the floor to allow for proper air return. Lennox offers an optional upflow unit stand as For horizontal applications in high humidity areas remove listed in Table 1.
  • Page 17 TOP CAP DETAIL C TOP CAP ROTATED TO SCREWS CORRECT POSITION CABINET SUPPORT 3/16" PLASTIC PLUG (REAR COIL END SEAL) 90º HORIZONTAL DRIP BEND 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

    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. The unit is now locked in place. Install return air plenum and secure with sheet metal screws.
  • Page 20 REMOVE RUBBER PLUG FROM BOTH LIQUID AND SUCTION LINES NOTE CBX32MV SERIES UNITS USE NITROGEN OR DRY AIR AS A HOLDING CHARGE. IF THERE IS NO PRESSURE WHEN THE RUBBER PLUGS ARE REMOVED, CHECK THE COIL FOR LEAKS BEFORE INSTALLING.

  • Page 21: Condensate Drain Requirements

    Technical Support Product Applications for assistance. To It is recommended that the overflow drain line be obtain the correct information from Lennox, be sure to communicate the following information: vented and a trap installed. Refer to local codes.

  • Page 22: Inspecting And Replacing Filters

    TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES FEET (25MM PER 3 GENERALLY, TWO INCHES (51MM). METERS) *LENNOX P−TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J−TRAP 91P90. Figure 13. Typical Main and Overflow Drain Installations Table 4. Filter Dimensions Inspecting and Replacing Filters Unit Model No.

  • Page 23: Field Control Wiring

    Make sure the liquid line and suction line entry points are Select the proper supply circuit conductors in 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.

  • Page 24: Outdoor Air Sensor

    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 É...
  • Page 25 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 26 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 27 Table 7. Run Length Communicating Outdoor Air Sensor Wire Run Length AWG # Insulation/Core Types This is a two screw terminal for connection to a Lennox Maximum length of wiring Color−coded, temperature º º for all connections on the rating 95...
  • Page 28 CBX32MV / CBX40UHV 2−STG COMPRESSOR 1−STG COMPRESSOR JUMPER & LINK GUIDE CUT LINK DO NOT CUT 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...

  • Page 29: 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 30: Delay Profile

    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- 45 SEC.
  • Page 31 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 −...
  • Page 32 Table 12. AHC Control Single Character Display Alert Codes (Communicating and Non−Communicating) Error Codes Status of Air Handler E 105 Device communications problem − No other devices on BUS (Communication system). E 114 No 60 hertz power (Check voltage and frequency) E 115 Low 24 volts (18 or less volts) −...

  • Page 33: 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. If three horizontal bars displays, Air Handler Control does not recognize unit size code (air handler model size and capacity).
  • Page 34 Configuring Unit Size Codes (Model Number) Power−up Unit Size Code (number or letter) displayed represents unit size code (air handler model size and capacity). If three horizontal bars display, then Air Handler Control (AHC) does not recognize unit size code. AHC in IDLE mode (No heating, cooling or indoor fan operation) To enter unit size code...
  • Page 35 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 36 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 37 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 38 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 CUT ON−BOARD LINK Y1−Y2 cooling and heat pump) 2−STAGE Y1−Y2 FOR COMPR...

  • Page 39: 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 R−O...

  • Page 40: 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 41: 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 Turn room thermostat to (Solid bar), then release button. Push and hold button until the solid A symbol is displayed on the (Solid bar) starts blinking...

  • Page 42: 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 43: Indoor Coil

    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 44: 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 3.
  • Page 45 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 46 This section details unit operating sequence for non−communicating systems. NOTE − For communicating systems, see the icomfort Toucht 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...
  • Page 47 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- Normal Operation...
  • Page 48 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 48 CBX32MV...
  • Page 49 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 49 CBX32MV...
  • Page 50 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) 3.
  • Page 51 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) 3.
  • Page 52 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) 3.
  • Page 53 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 54 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 55 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) 3.
  • Page 56 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 57: 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−MOUNTED AND MUST BE ORDERED SEPARATELY (CATALOG # 88K38). DISCHARGE SENSOR (DAT) 5−1/2 IN. ELECTRIC HEAT RELAY (140 MM) PART NO.
  • Page 58 A−TRANSFORMER (T1) Wiring distance between the Air Handler Control and the All CBX32MV series units use a single line voltage to discharge air sensor should not exceed 10’ (3m) when 24VAC transformer mounted in the control box. The wired with 18−gauge thermostat wire.
  • Page 59 Then the motor will immediately attempt a restart. The shutdown feature provides protection in case of a EARLIER ECM MOTORS USED ON OTHER LENNOX AIR HANDLER frozen bearing or blocked blower wheel. The motor may MODELS ARE NOT INTERCHANGEABLE WITH MOTORS USED ON THE CBX32MV LINE.
  • Page 60 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 61 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 62 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 63: 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 64 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 64 CBX32MV...

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