Lennox CBX40UHV Series Unit Information
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Air Handlers
  5. CBX40UHV Series
  6. Unit information

Lennox CBX40UHV Series Unit Information

Hide thumbs Also See for CBX40UHV Series:
Table of Contents

Advertisement

Quick Links

Download this manual
Service Literature
CBX40UHV (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
(CBX40UHV−XXX−230−6−02 and later).
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.
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.
Corp. 0906−L2
Revised 12/10
applications,
the
Lennox

TABLE OF CONTENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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® 7000
non−communicating thermostat and non−communicating
outdoor units. In addition, this unit has the enhance capability
of communicating with the icomfort Toucht 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 icomfortt enabled version (CBX40UHV−XXX−
230−6−01)
2. icomfortt enabled version (CBX40UHV−XXX−230−6−02)
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.
Page 1
CBX40UHV
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
2010 Lennox Industries Inc.
2
2
3
3
9
9
22
27
33
36
36
37
38
47

Advertisement

Table of Contents
loading

Related Manuals for Lennox CBX40UHV Series

Summary of Contents for Lennox CBX40UHV Series

  • Page 1: Table Of Contents

    ....... . . CBX40UHV series units are designed to be matched with 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 CBX40UHV CBX40UHV...

  • Page 3: Blower Performance

    First stage cooling air volume is 70% of COOL speed setting. . Continuous blower speeds are adjustable to 28%, 38%, 70% and 100% of COOL speed setting (default setting is 38%). Lennox Harmony IIIt Zone Control applications minimum blower speed is 250 cfm.
  • Page 4 First stage cooling air volume is 70% of COOL speed setting. . Continuous blower speeds are adjustable to 28%, 38%, 70% and 100% of COOL speed setting (default setting is 38%). Lennox Harmony IIIt Zone Control applications minimum blower speed is 250 cfm.
  • Page 5 First stage cooling air volume is 70% of COOL speed setting. . Continuous blower speeds are adjustable to 28%, 38%, 70% and 100% of COOL speed setting (default setting is 38%). Lennox Harmony IIIt Zone Control applications minimum blower speed is 380 cfm.
  • Page 6 First stage cooling air volume is 70% of COOL speed setting. . Continuous blower speeds are adjustable to 28%, 38%, 70% and 100% of COOL speed setting (default setting is 38%). Lennox Harmony IIIt Zone Control applications minimum blower speed is 450 cfm.
  • Page 7 CBX40UHV-048 and CBX40UHV−060 BLOWER MOTOR WATTS AT +" (Plus) 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 1028 COOL SPEED TAP 1...

  • Page 8: Parts Arrangement

    PARTS ARRANGEMENT ELECTRIC HEAT SECTION CONTROL BOX BLOWER COMPARTMENT BLOWER ACCESS HORIZONTAL PANEL DRAIN PAN COIL COIL ACCESS PANEL UP−FLOW/DOWN−FLOW DRAIN PAN FILTER ACCESS PANEL FILTER Figure 1. CBX40UHV Parts Arrangement HEATING ELEMENTS HEATING ELEMENTS LIMIT LIMIT RELAY RELAY CIRCUIT BREAKER AIR HANDLER CONTROL Figure 2.

  • Page 9: I−Application

    D−COIL all tools on an unpainted unit surface before perform- ing any service procedure. All CBX40UHV series units have dual slab coils arranged in an "A" configuration. Each coil has two or three rows of II−UNIT COMPONENTS copper tubes fitted with ripple-edge aluminum fins. A check and expansion valve complete with inlet screen feeds A−CONTROL BOX...
  • Page 10 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 11 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 12 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 13 OUTDOOR IMPORTANT USE CARE WHEN CUTTING LINKS TO SENSOR (X2658) PREVENT DAMAGE TO CONTROL. SEE FIGURE 12, 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 14 H−AIR HANDLER CONTROL 9−PIN CONNECTOR Table 4. Air Handler Control Connections Communicating (CBX40UHV−XXX−230−6−02) 1. Air Handler ONLY − 2−wire harness (Wired to points 7 Label Label Function and 8) from the factory provides 230 volt power to Air Handler Control. 24VAC 2.
  • Page 15 I−AIR HANDLER CONTROL BUTTON, DISPLAY AND B. Once demand is met, motor runs at 100% for 45 JUMPERS seconds. C. Motor ramps down to stop. Use figure 10 as reference for jumper settings. If any of the reference jumpers are missing, the Air Handler Control will Heating Heat Pump only: display Error Code 130 as per table 14, and the Air Handler...
  • Page 16 CBX40UHV JUMPER & LINK GUIDE 1−STG COMPRESSOR 2−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 17 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 18 The DC filter capacitors inside the controller are connected electrically to the motor supply wires. The capacitors take EARLIER ECM MOTORS USED ON OTHER LENNOX AIR HANDLER approximately 5 minutes to discharge when the disconnect MODELS ARE NOT INTERCHANGEABLE WITH MOTORS USED ON is opened.
  • Page 19 INDOOR BLOWER MOTOR (B3) CONTROL P48 5 PIN TROUBLESHOOTING (REGAL−BELOIT) P49 4 PIN To verify motor operation see steps below and figure 15. CHECK POWER TO MOTOR 1. Remove J48 (5−pin power plug) from P48 on the motor. 2. With the power on at the air handler, use a test meter to verify 230V between pins 4 and 5 on J48.
  • Page 20 INDOOR BLOWER MOTOR (B3) CONTROL CONTROL MODULE TROUBLESHOOTING (EMERSON) 3−PIN JACK 1. Disconnect three−wire harness from motor control module. A. If the plug terminals inside the module are damaged. B. If terminals are not damaged, proceed to next step. 2. Inspect the negative temperature coefficient (NTC) thermistor (see figure 18) for any cracks or breakage.
  • Page 21 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 20. 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 22: Optional Electric Heat

    P48 (5−PIN) HARNESS P49 (4−PIN) HARNESS P48 (5−PIN) HARNESS J49 4 Pin CONTROL MODULE MOTOR J49 Connector 24v Transformer Figure 22. J49 Test (Emerson) III−OPTIONAL ECB40 ELECTRIC HEAT 3. Terminal Strip (TB2) A−MATCHUPS AND RATINGS For the electric heat sections without circuit breakers or fuses, line voltage connections are made to terminal strip Tables 8, 9 and 10 show all approved CBX40UHV to ECB40 TB2.
  • Page 23 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 Page 23 CBX40UHV...
  • Page 24 TABLE 8 ELECTRIC HEAT DATA − CBX40UHV−024 AND CBX40UHV−030 SINGLE PHASE ELECTRIC HEAT CBX40UHV−024 CBX40UHV−030 MAXIMUM MAXIMUM MINIMUM MINIMUM BLOW- OVERCUR- OVERCUR- CIRCUIT CIRCUIT VOLT RENT RENT AMPACITY AMPACITY BTUH MOTOR PROTECTION PROTECTION MODEL NUMBER INPUT STAGE FULL LOAD CIRCUIT CIRCUIT AMPS 2.5 kW...
  • Page 25 TABLE 9 ELECTRIC HEAT DATA − CBX40UHV−036 SINGLE PHASE ELECTRIC HEAT CBX40UHV−036 MINIMUM MAXIMUM CIRCUIT OVERCURRENT BLOWER AMPACITY PROTECTION VOLTS BTUH MOTOR MODEL NUMBER STAGE INPUT INPUT INPUT FULL LOAD CIRCUIT CIRCUIT AMPS 12,800 30.5 − − − − − − 5 kW ECB40-5 (34W87) Terminal Block...
  • Page 26 TABLE 10 ELECTRIC HEAT DATA − CBX40UHV−042, CBX40UHV−048 AND CBX40UHV−060 SINGLE PHASE ELECTRIC HEAT CBX40UHV−042, CBX40UHV−048 and CBX40UHV−060 MAXIMUM OVERCUR- BLOWER MINIMUM VOLT RENT MOTOR NO. OF CIRCUIT AMPACITY BTUH PROTECTION FULL MODEL NUMBER STAGE INPUT LOAD CIRCUIT CIRCUIT CIRCUIT CIRCUIT CIRCUIT CIRCUIT...

  • Page 27: Optional Humidity Control

    ComfortSense 7000 thermostat performance ® ComfortSense 7000 thermostat The Lennox ComfortSenset 7000 thermostat (shown Blower speed selection can adversely affect ComfortSense below) monitors indoor humidity conditions and creates a 7000 thermostat performance. Higher blower speeds dehumidification demand in response to indoor humidity...
  • Page 28 PRECISION mode User Control of Humidification / Dehumidification with or without a cooling demand. COOL Dehumidification is on, the D is active (reverse logic, off), and G, Y1, and Y2 (if available) are on. Note that H is inactive (off) during dehumidification.
  • Page 29 ® Table 12. 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 Acceptable 24 VAC High...
  • Page 30 ® Table 13. 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 −...
  • Page 31 FIELD TEST MODE (NOTE BOARD MUST BE IN IDLE MODE) Single Character LED Action Display Solid To enter Field Test Mode, push and hold button until solid appears, release button. Display will blink. Push and hold button until required symbol displays. H A or P Blinking CONFIGURING ELECTRIC HEAT SECTIONS Release push button...
  • Page 32 Table 14. Control Single Character Display Alert Codes (Communicating and Non−Communicating) Alert Status of Air Handler Codes E 105 Equipment is unable to communicate. Indicates numerous message errors. In most cases errors are related to electrical noise. E 114 No 60 Hertz Power. E 115 24−Volt Power Low (Range is 18 to 30 volts).

  • Page 33: 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 15.
  • Page 34 8. From the upflow position, flip cabinet 90º to the left and set into place. Replace coil assembly. Secure coil in 1/2 IN. SCREWS MAXIMUM ELECTRICAL INLET ANGLE IRON OR place by bending down the tab on the cabinet support CLEARANCE 4 IN.
  • Page 35 ONE INCH PER 10 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 30. Main Drain Page 35 CBX40UHV...

  • Page 36: Start Up Operation

    VI−START-UP − OPERATION B−EXTERNAL STATIC PRESSURE A−PRELIMINARY AND SEASONAL CHECKS Measure tap locations as shown in figure 31. 1. Make sure the unit is installed in accordance with the installation instructions. 2. Inspect electrical wiring, both field and factory installed for UNIT SHOWN IN SUPPLY loose connections.

  • Page 37: Maintenance

    VIII−MAINTENANCE See the tables below for replacement filter sizes. Table 17. 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 38: Configuring Unit Flow Charts

    IX− FLOW CHARTS 1. Air Handler Control (AHC) 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 39 2. Configuring Unit Size Codes − − Power−up − Unit Size Code (number or letter) displayed represents unit size code (air handler − model size and capacity). If three horizontal bars display, Air Handler Control (AHC) does not recognize unit size code (air handler model size and capacity). AHC in IDLE mode (No heating, cooling or indoor fan operation)
  • Page 40 3. Configuring / Detecting Electric Heat Elements IMPORTANT: All electric heat installations require the Air Handler Control (AHC) to be manually configured to detect number of heat elements. NOTE − All field replacement AHC will require configuring/detecting electric heat elements. RECOMMEND −...
  • Page 41 ® 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 42 ® 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 43 7. Heat Pump Operation Y1−Y2 Air Handler Control AHC) Indoor Blower Mode Speed and Profiles settings 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) R−O...
  • Page 44 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 R−O AHC on−board link must be cut between Y1 and Y2 to allow 2 stage cooling operation.
  • Page 45 4. Error Code / Recall Mode AHC in Idle Mode (No heating cooling or indoor fan operation) To enter Error Code Mode, push and hold button next to Turn room thermostat to OFF 7−Segment LED display until solid E symbol appears, release button.
  • Page 46 5. Indoor Blower Test Field Test Mode AHC in Idle Mode (No heating cooling or indoor fan operation) To enter Field Test Model, push and hold button next 7−segment LED display until Turn room thermostat (Solid bar), then release to OFF button.

  • Page 47: Diagrams

    X−DIAGRAMS AND SEQUENCE OF OPERATION A−CBX40UHV − 208/230V SINGLE PHASE − SEQUENCE OF OPERATION 1. Line voltage is routed to transformer T1 and blower 4. AHC energizes blower motor B3 on heating speed. motor B3. COOLING 2. T1 supplies 24VAC to terminal strip TB2, which 5.
  • Page 48 TABLE 19 CBX40UHV COOLING OPERATION AND JUMPER SUMMARY (OPTIONAL ACCESSORIES) WITHOUT ® ComfortSense 7000t WITHOUT HARMONY IIIt THERMOSTAT UNIT JUMPERS BLOWER SPEED DEMAND DS to R Single Speed Y1 to Y2 COOL Condensing Unit O to R 70% of COOL Two Speed DS to R Condensing Unit...
  • Page 49 B−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. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized. Page 49 CBX40UHV...
  • Page 50 B−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. Page 50 CBX40UHV...
  • Page 51 C−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 52 C−ECB40-9CB − 208/230V SINGLE PHASE − SEQUENCE OF OPERATION FIRST−STAGE HEAT SECOND−STAGE HEAT (remove jumper between W2 and R) 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.
  • Page 53 D−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 54 E−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 55 F−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 56 G−ECB40−8, 10 AND ECB40-15CB − 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 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 57 H−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.

This manual is also suitable for:

Cbx40uhv-024Cbx40uhv-030Cbx40uhv-036Cbx40uhv-042Cbx40uhv-048Cbx40uhv-060

Table of Contents