Lennox CBX40UHV Series Installation And Service Procedure
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Lennox CBX40UHV Series Installation And Service Procedure

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Service Literature
CBX40UHV (HFC-410A) SERIES UNITS (Communicating)
NOTICE
A thermostat is not included and must be ordered
separately.
D A Lennox communicating thermostat must be used in
communicating applications
(CBX40UHV-XXX-230-6-02 and later).
D In
non-communicating
®
ComfortSense
7500 thermostat may be used, as well
as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
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
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
INSTALLATION AND SERVICE
PROCEDURE
Revised August, 2018
the
Lennox
Corp. 0906-L2

TABLE OF CONTENTS

Blower Performance
Application
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Field Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electric Heat Diagrams and Sequence of
Operations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CBX40UHV series units are designed to be matched with
Lennox two‐stage or single‐stage HFC-410A air conditioner
units and heat pumps. Several models are available in sizes
ranging from 2 through 5 tons. All units are equipped with
factory installed HFC-410A check and expansion valve for
cooling or heat pump applications.
This air handler is compatible with the ComfortSense® 7500
non-communicating thermostat and non-communicating
outdoor units. In addition, this unit has the enhanced
capability
of
thermostat and compatible outdoor units using the Lennox
RSBus protocols.
Optional ECB40 electric heat is available in several kW
sizes, and can be field installed in the cabinets.
This document provides service information on the
following model builds:
1. Non-communicating
230-6-01)
2. Communicating version (CBX40UHV-XXX-
230-6-02) or later.
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communicating
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2018 Lennox Industries Inc.
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communicating
(CBX40UHV-XXX-

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Summary of Contents for Lennox CBX40UHV Series

  • Page 1 ........as other non-communicating thermostats. CBX40UHV series units are designed to be matched with In all cases, setup is critical to ensure proper system Lennox two‐stage or single‐stage HFC-410A air conditioner...

  • Page 2: Model Number Identification

    036 = 3 tons 042 = 3.5 tons 048 = 4 tons 060 = 5 tons SPECIFICATIONS / ELECTRICAL DATA Refer to the Unit Engineering Handbook or Lennox Price Book for optional accessories for this unit. SPECIFICATIONS General Data CBX40UH CBX40UH...

  • Page 3: Blower Performance

    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 if 250 cfm. CBX40UHV‐024 BLOWER MOTOR WATTS AT “+” (Plus) AHC 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 if 250 cfm. CBX40UHV‐030 BLOWER MOTOR WATTS AT “+” (Plus) AHC 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 380 cfm. Lennox Harmony III™ Zone Control applications - minimum blower speed if 380 cfm. CBX40UHV‐036 BLOWER MOTOR WATTS AT “+” (Plus) AHC 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 if 450 cfm. CBX40UHV‐042 BLOWER MOTOR WATTS AT “+” (Plus) AHC 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 if 450 cfm. CBX40UHV‐048 and CBX40UHV-060 BLOWER MOTOR WATTS AT “+” (Plus) AHC SETTING (“Adjust” Jumper at “+”...

  • Page 8: Parts Arrangement

    CBX40UHV‐048 and CBX40UHV-060 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (“Adjust” Jumper at “-” Setting) Motor Watts @ Various External Static Pressures - in. wg. AHC Jumper Speed Positions HEAT SPEED TAP 1 TAP 2 TAP 3 TAP 4 COOL SPEED TAP 1 TAP 2...

  • Page 9: Application

    Transformer (T1) static discharge by putting the unit, the control and the All CBX40UHV series units use a single line voltage to technician at the same electrostatic potential. 24VAC transformer mounted in the control box. The...
  • Page 10 Coil Wiring distance between the Air Handler Control and the All CBX40UHV series units have dual slab coils arranged in discharge air sensor should not exceed 10' (3m) when an ”A” configuration. Each coil has two or three rows of wired with 18-gauge thermostat wire.
  • Page 11 DETAIL A THE AIR HANDLER CONTROL (AHC) HAS TWO SCREW TERMINALS MARKED DISCHARGE AIR SENSOR. THE SENSOR IS REQUIRED FOR ® EVENHEATER OPERATION, IS FIELD MOUNTED AND MUST BE ORDERED SEPARATELY (CATALOG # 88K38). OPTIONAL DISCHARGE SENSOR (DAT) 5-1/2 IN. ELECTRIC HEAT RELAY (140 MM) PART NO.
  • Page 12 DETAIL A THE AIR HANDLER CONTROL (AHC) 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 13: Field Wiring

    FIELD WIRING COMFORTSENSET CBX40UHV 7000 AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. R CONNECTION REQUIRED FOR AIR CONDITIONER UNIT WITH LSOM. AIR CONDITIONER RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE UNIT COMFORTSENSE 7000 WITH THE LSOM 2.
  • Page 14 OUTDOOR IMPORTANT — USE CARE WHEN CUTTING LINKS TO SENSOR PREVENT DAMAGE TO CONTROL. SEE FIGURE 12, (X2658) CBX40UHV JUMP AND LINK GUIDE FOR FURTHER DETAILS. RESISTOR KIT (CAT # 47W97) IS REQUIRED EDA UNIT WHEN CONNECTING THE COMFORTSENSE 7000 WITH THE LSOM 2. RELAY CBX40UHV Y1-Y2...
  • Page 15 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 16 Table 5. Run Length — Non-Communicating IMPORTANT (CBX40UHV-XXX-230-6-01 and -02) Wire Run Length AWG # Insulation/Core Types Before changing any clippable links or jumper settings, Color-coded, temperature make sure the motor has completely stopped. Any Less than 100' (30m) º º...

  • Page 17: Air Handler Control Button, Display And Jumpers

    AIR HANDLER CONTROL BUTTON, DISPLAY AND A. When cool demand is initiated, motor ramps up to JUMPERS 100% and runs at 100% until demand is satisfied. B. Once demand is met, motor runs at 100% for 45 Use figure 10 as reference for jumper settings. If any of the seconds.
  • Page 18 CBX40UHV JUMPER & LINK GUIDE 2−STG COMPRESSOR 1−STG COMPRESSOR 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 1 2 3...
  • Page 19 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 1 2 3 4...

  • Page 20: Variable Speed Ecm Blower Motor

    (this is called “soft‐start”). The motor may take as long as 60 seconds to reach full speed. If Earlier ECM motors used on other Lennox air handler the motor does not reach 200RPM within 13 seconds, the models are not interchangeable with motors used on the motor shuts down.
  • Page 21 The DC filter capacitors inside the controller are connected 4. Test is complete. Remove jumpers and reconnect electrically to the motor supply wires. The capacitors take plugs. approximately 5 minutes to discharge when the disconnect Another option is to use the TECMate PRO with the 16 to is opened.
  • Page 22 Indoor Blower Motor (B3) Control P48 5 PIN P49 4 PIN Troubleshooting (Emerson) NOTE: If the communication channel is disrupted (loss of communication and and 24VAC) to the air handler control, the motor will continue to operate at its current mode. This means, if the motor is currently in idle, it will stay in idle mode;...
  • Page 23 B. If there is no damage, proceed to next step. CONTROL MODULE 3. Check resistance between each of the three-phase 3-PIN JACK terminals in the motor harness as illustrated in figure 19. Resistance between any two contacts should be equal. If resistance between any two contacts are not equal, or if any resistance shows open or short-circuited, replace the motor.
  • Page 24 P48 (5-PIN) HARNESS P49 (4-PIN) HARNESS P48 (5-PIN) HARNESS P49 4 Pin CONTROL MODULE MOTOR 120v J48 Connector 230v Figure 21. J48 Test (Emerson) P48 (5-PIN) HARNESS P49 (4-PIN) HARNESS P48 (5-PIN) HARNESS J49 4 Pin CONTROL MODULE MOTOR J49 Connector 24v Transformer Figure 22.

  • Page 25: Optional Ecb40 Electric Heat

    OPTIONAL ECB40 ELECTRIC HEAT 3. Terminal Strip (TB2) Match-ups and Ratings For the electric heat sections without circuit breakers or fuses, line voltage connections are made to terminal strip The tables on the following pages show all approved TB2. The terminal strip is located in the lower left corner of CBX40UHV to ECB40 matchups and electrical ratings.
  • Page 26 ECB40-9CB P VOLTAGE SHOWN Elements HE1 and HE2 Primary Limit S15 and Relay K33 Secondary Limit S20 Location of CB1 Relay K32 Figure 23. Electric Heat CBX40UHV Page 26...
  • Page 27 ELECTRIC HEAT DATA - CBX40UHV-024 AND CBX40UHV-030 SINGLE PHASE ELECTRIC HEAT CBX40UHV-024 CBX40UHV-030 Minimum Maximum Blower Circuit Overcurrent Minimum Maximum Volts Btuh Motor Ampacity Protection Model Number Circuit Overcurrent Input Input Input Full Load Circuit Circuit Stages Ampacity Protection Amps 6,400 - - - - - -...
  • Page 28 ELECTRIC HEAT DATA - CBX40UHV-036 SINGLE PHASE ELECTRIC HEAT CBX40UHV-036 Minimum Maximum Circuit Overcurrent Blower Volts Btuh Ampacity Protection Model Number Motor Full Input Input Input Circuit Circuit Stages Load Amps 10,250 - - - - - - ECB40-4 (55W89) 11,450 - - - - - -...
  • Page 29 ELECTRIC HEAT DATA - CBX40UHV-036 (Continued) THREE PHASE ELECTRIC HEAT CBX40UHV-036 Blower Minimum Maximum Volts Btuh Model Number Motor Full Circuit Overcurrent Input Input Input Stages Load Amps Ampacity Protection 15.0 51,200 16.8 57,300 20 kW ECB40-20CB (35W01) 19 lbs. (2) 35A Circuit breaker 18.4 62,700...

  • Page 30: Optional Humidity Control

    ComfortSense 7000 Thermostat 60 percent relative humidity (RH). 50% RH is the The Lennox ComfortSenset 7000 thermostat (shown recommended initial setpoint until personal comfort level is below) monitors indoor humidity conditions and creates a established. The personal comfort level will vary with dehumidification demand in response to indoor humidity humidity as with temperature.
  • Page 31 to its dew point removing more moisture). At the same time, in heating mode, the dehumidification function is off. The the two‐stage outdoor unit will switch to high-speed to default mode for dehumidification is OFF and needs to be produce a colder indoor coil. The colder indoor coil and activated during installation.
  • Page 32 Setting HUMIDITY OFFSET 2- Scroll to HUMIDITY SETTINGS; press ENTER. (If both Humidify and Dehumidify are on, the following screen The Default setting is 0%. This can be used to offset the appears; otherwise go to the step 3). Press the box displayed and controlled space relative humidity (RH) by up below HUMIDIFY.

  • Page 33: Unit Sequence Of Operations

    UNIT SEQUENCE OF OPERATIONS ® Table 9. CBX40UV with ComfortSense 7000 Thermostat and Single-Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity System Handler Step Comp Comments Condition Status (COOL) NO CALL FOR DEHUMIDIFICATION Compressor and indoor Normal handler...
  • Page 34 ® Table 10. CBX40UV, with ComfortSense 7000 Thermostat and Two‐Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity Handler System Compre Condition Status ssor Step (COOL) Comments No Call for Dehumidification Normal Operation Acceptable 24 VAC - Y1 Compressor and indoor air...

  • Page 35: Unit Status And Alarm Codes

    UNIT STATUS AND ALARM CODES Table 11. AHC System Status Codes AHC Single Character Action Display Letter or Number Unit Size Code (number or letter) displayed represents air handler model size and capacity. If three horizontal bars are displayed, AHC does not recognize air handler model size and capacity. Idle mode (decimal point / no unit operation) Delivered CFM.
  • Page 36 Table 13. AHC Single Character Display — Error 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 37 Table 13. 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 O relay failed. Pilot relay contacts did not close or the relay coil did not energize. Re­ E345 led.

  • Page 38: Application Configuration Modifications

    3. Install units that have no return air plenum on a stand that is at least 14” (356 mm) from the floor to allow for proper air return. Lennox offers an optional upflow unit stand as listed in table 14.
  • Page 39 NOTE - Be very careful when you reinstall the screws into coil end plate engaging holes. Misaligned screws may 1/2 IN. SCREWS MAXIMUM ELECTRICAL INLET ANGLE IRON OR CLEARANCE 4 IN. (102 MM) damage the coil. SHEET METAL 8. From the upflow position, flip cabinet 90º to the left and set into place.
  • Page 40 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 41: Start-Up Operation

    START‐UP - OPERATION 1. Blower operation is dependent on thermostat control system. Preliminary and Seasonal Checks 2. Generally, blower operation is set at thermostat subbase fan switch. With fan switch in ON position, 1. Make sure the unit is installed in accordance with the installation instructions.

  • Page 42: Maintenance

    MAINTENANCE See the tables below for replacement filter sizes. Table 16. MERV16 Disposable Filter (five inch) WARNING Unit Model No. Filter Size Inches (mm) Catalog # CBX40UHV-024, Improper installation of the air handler can result in 20 x 20 x 5 (508 x 508 x 127) X7935 -030 and -036 personal injury or death.

  • Page 43: Configuring Unit Flow Charts

    CONFIGURING UNIT FLOW CHARTS 1. Air Handler Control (AHC) Checkout 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 (AHC) does not recognize unit size code (air handler model size and capacity).
  • Page 44 2. Configuring Unit Size Codes 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 45 3. Configuring / Detecting Electric Heat Elements 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 —...
  • Page 46 ® 5. EvenHeater 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...
  • Page 47 ® 6. EvenHeater Operation (continued) EVENHEAT Operation Note 1 Activation delay 120 seconds if one heat stage is activated or deactivated 150 seconds if more than one stage is activated or deactivated. Start Timer Delay (Note 1) Change in Heat demand from room thermostat? Delay Timer...
  • Page 48 7. Heat Pump Operation Air Handler Control AHC) Indoor Blower Mode Speed and Profiles settings Y1-Y2 CUT ON-BOARD LINK Y1-Y2 2-STAGE Set Cooling Mode Blower Speed jumper pin . (Low and high indoor blower CFM settings are FOR TWO-STAGE A/C COMPR identical for cooling and heat pump) Set Blower Adjust Selection jumper pin.
  • Page 49 3. Cooling Operation Air Handler Control AHC) 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 TWO-STAGE A/C COMPR Set Blower Adjust Selection jumper pin. Single or Two-Stage Unit AHC on-board link must be cut between Y1 and Y2 to allow 2 stage cooling operation.
  • Page 50 4. Error Code / Recall Mode AHC in Idle Mode (No heating cooling or indoor fan operation) To enter Error Code Mode, push Turn room thermostat to OFF and hold button next to single character LED display until solid E symbol appears, release button.
  • Page 51 5. Indoor Blower Test Blower Test Mode AHC in Idle Mode (No heating cooling or indoor fan operation) To enter Indoor Blower Test Mode, push and hold button next single character LED display until — (Solid Turn room thermostat to OFF bar), then release button.

  • Page 52: Unit Diagram

    UNIT DIAGRAM CBX40UHV - 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 TB2, which supplies 24VAC to the indoor thermostat and electric heat, if used. HEATING 3.

  • Page 53: Electric Heat Diagrams And Sequence Of Operations

    ELECTRIC HEAT DIAGRAMS AND SEQUENCE OF OPERATIONS ECB40-2.5, -4, -5 and ECB40-4CB, -5CB 208/230V Single-Phase - Sequence of Operation 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC outputs a 22VDC signal to the K32 relay. K32-1 closes. 2.
  • Page 54 ECB40-6 and ECB40-6CB 208/230V Single-Phase Sequence of Operation 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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. CBX40UHV Page 54...
  • Page 55 ECB40‐8 and ECB40-8CB - 208/230V Single-Phase Sequence of Operation FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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 ECB40‐9CB - 208/230V Single-Phase Sequence of Operation First-Stage Heat Second-Stage Heat (remove jumper between W2 and 1. W1 of the thermostat provides a W1 demand to the 3. When K32‐1 closes, the unit is ready for a second stage AHC. The AHC outputs a 22VDC signal to the K32 relay. heat demand.
  • Page 57 ECB40-12.5CB, ‐15CB - 208/230V Single-Phase Sequence of Operation FIRST-STAGE HEAT 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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. 3.
  • Page 58 ECB40‐20CB - 208/230V Single-Phase Sequence of Operation First-Stage Heat 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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 59 ECB40‐25CB - 208/230V Single-Phase Sequence of Operation First-Stage Heat 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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 G-ECB40-8, 10 and ECB40‐15CB - 208/230V Single-Phase Sequence of Operation First-Stage Heat 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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 (remove jumper between W2 and R) 3.
  • Page 61 ECB40‐20CB, ECB25CB - 208/230V Three-Phase Sequence of Operation First-Stage Heat 1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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.

This manual is also suitable for:

Cbx40uhv-024Cbx40uhv-030

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