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©2024 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
Every working procedure that affects safety means shall
only be carried out by competent persons. This appliance
is not to be used by persons (including children) with
reduced physical, sensory or mental capabilities, or
lack of experience and knowledge, unless they have
been given supervision or instruction concerning use of
the appliance by a person responsible for their safety.
Children should be supervised to ensure they do not
play with the appliance.
CAUTION
Leak Detection System installed. Unit must be powered
except for service.
WARNING
Maximum Altitude of application is 3200m above sea level.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
CAUTION
Servicing shall be performed only as recommended by
the manufacturer.
INSTALLATION
INSTRUCTIONS
Merit
Series
®
CBK45UHET Air Handler Units - R454B
MULTI-POSITION AIR HANDLERS
508438-01
5/2024
Table of Contents
General Information .......................................................2
Wiring Diagrams ............................................................3
Air Flow - Cooling Blower Speed ..................................4
Blower Data ..................................................................5
Requirements ................................................................6
Unit Dimensions - Upflow Position.................................8
Unit Dimensions - Horizontal Position ..........................9
Installation Clearances ................................................10
Installation ...................................................................10
Sensor / Bracket Installation .........................................13
Condensate Drain.........................................................16
Duct System and Filters .............................................17
Brazing Refrigerant Lines ............................................18
Sealing the Unit ...........................................................21
Electrical Connections .................................................21
Check-out Procedures .................................................23
Operation ....................................................................23
Homeowner Maintenance ............................................24
Repairing or Replacing Cabinet Insulation ..................24
Professional Maintenance ...........................................24
Sensor Maintenance ....................................................25
Modes of Operation ......................................................25
Start Up Test Procedure ...............................................27
Decommissioning ........................................................28
NOTE - This unit is a PARTIAL UNIT AIR CON DITIONER,
complying with PARTIAL UNIT requirements of this Stan-
dard, and must only be connected to other units that have
been confirmed as complying to corre sponding PARTIAL
UNIT requirements of this Standard, UL 60335-2-40/CSA
C22.2 No. 60335-2-40, or UL 1995/CSA C22.2 No 236.
Partial units shall only be connected to an appliance suit-
able for the same refrigerant.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
Ducts connected to an appliance shall not contain a
potential ignition source
Page 1
WARNING
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Summary of Contents for Lennox Merit CBK45UHET Series
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Merit Series ® Dallas, Texas, USA CBK45UHET Air Handler Units – R454B MULTI-POSITION AIR HANDLERS 508438-01 5/2024 Table of Contents General Information ............2 Wiring Diagrams ............3 Air Flow – Cooling Blower Speed ........4 Blower Data ..............5 Requirements ..............6... -
Page 2: General Information
WARNING WARNING • Do not use means to accelerate the defrosting pro- For duct connected appliances, false ceilings or cess or to clean, other than those recommended by drop ceilings may be used as a return air plenum if a the manufacturer. -
Page 3: Wiring Diagrams
Cut size: 7" Wide x 9-1/2" Tall Wiring Diagrams PART NO. 538348-01 WIRING DIAGRAM - ELECTRIC HEAT 20KW HTR 3 HTR 2 HTR 1 HTR 4 SEC L SEC L SEC L SEC L HTR 3 HTR 2 HTR 4 HTR 1 PRI LS PRI LS... -
Page 4: Air Flow - Cooling Blower Speed
IMPORTANT Indoor Unit Thermostat RDS Control Board Outdoor Unit Minimum Air Flow when RDS initiates mitigation is factory set at 350 CFM Per Ton. WARNING Electric shock hazard! - Disconnect all power supplies before servicing. Auxiliary Heat Auxiliary Heat Replace all parts and panels before (Heat Pump) (Heat Pump) operating. -
Page 5: Blower Data
Blower Data CBK45UHET-024 Air Volume and Motor Watts External Static Tap 1 Tap 2 Tap 3 Tap 4 Tap 5 Pressure in. w.g. Watts Watts Watts Watts Watts 1015 1015 1054 1020 CBK45UHET-030 Air Volume and Motor Watts External Static Tap 1 Tap 2 Tap 3... -
Page 6: Requirements
Failure to do so can structions and local municipal building codes, installation result in back or other type of injury. of Lennox air handler units (with or without optional elec- tric heat), MUST conform with National Fire Protection As- IMPORTANT sociation (NFPA) standards: “Standard for Installation of... - Page 7 Local authorities having jurisdiction should be consulted WARNING before installation is made. Such applicable regulations or requirements take precedence over the general instruc- Danger of explosion. Keep flammable tions in this manual. materials and vapors, such as gasoline, away Install the conditioned air plenum, ducts and air filters from air handler.
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Page 8: Unit Dimensions - Upflow Position
Unit Dimensions – Upflow Position 1 (25) DETAIL OF PIPING PLATE 4-3/4 3/4 (19) (121) SUCTION LINE SUPPLY AIR LIQUID OPENING CONDENSATE LINE 14-1/2 DRAINS (2) (368) 2-3/8 (Horizontal) (60) 1 (25) 1 (25) CONDENSATE DRAINS (2) 4-3/8 (Upflow and (111) 2-3/4 Downflow) -
Page 9: Unit Dimensions - Horizontal Position
Unit Dimensions – Horizontal Position 1-1/8 (29) DETAIL OF PIPING PLATE CONDENSATE CONDENSATE DRAINS (2) DRAINS (2) (Upflow and 4-3/4 3-1/2 (Horizontal) Downflow) (121) (89) 20-3/8 (518) OPENING (559) 1-3/4 (44) (19) SUCTION 2-3/4 LINE LIQUID (70) LINE 2-3/8 4-3/8 (60) (111) VOLTAGE INLETS... -
Page 10: Installation Clearances
• Work shall be undertaken under a controlled procedure WARNING so as to minimize the risk of a flammable gas or vapor being present while the work is being performed. To prevent serious injury or death: 1. Lock-out/tag-out before performing maintenance. •... -
Page 11: Refrigerant Metering Device
4. Markings on the equipment should be visible and • When breaking into the refrigerant circuit to make repairs legible. Markings and signs that are illegible shall be – or for any other purpose – conventional procedures shall corrected. be used. However, for flammable refrigerants it is import- ant that best practice be followed and, since flammability 5. -
Page 12: Horizontal Applications
5 - If the unit is suspended, the entire length of the cabinet must be supported. If you use a chain or strap, use a piece of angle iron or sheet metal attached to the unit (either above or below) to support the length of the cabinet. -
Page 13: Downflow Application
DOWNFLOW APPLICATION TOP CAP ROTATED TO NOTE – If downflow application is required, separately or- CORRECT POSITION der kit number Y9658 (-024 through -030) or Y9659 (-036 TOP CAP SCREWS CABINET SUPPORT through -060) and install per kit’s instructions. Also use metal or class I supply and return air plenums. - Page 14 Horizontal Left Configuration 1 - Remove sensor bracket assembly from vertical position. Do not remove sensor from bracket, and do not disconnect or reroute sensor wire from the control panel area. Set the sensor bracket assembly aside. 2 - Follow instructions for left-hand discharge as outlined in previous section on pages 12 and 13.
- Page 15 3 - With air handler access panels removed, install sensor bracket assembly to the side of the cabinet by lining up holes as shown in figure 11. FIGURE 11 (Detail) 4 - Loop and bundle any excess sensor wire with a wire tie.
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Page 16: Condensate Drain
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 MA IN DRAIN. -
Page 17: Duct System And Filters
NOTE - Do not operate air handler without a trap in the appropriate Lennox Product Specifications bulletin. main (primary) drain. The condensate drain is on the Additional information is provided in Service and negative pressure side of the blower;... -
Page 18: Brazing Refrigerant Lines
Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance. combinations. To obtain the correct information from Lennox, be sure to Handle the refrigerant lines gently during the installation communicate the following information: Model and capac- process. Sharp bends or kinks in the lines will cause a ity. - Page 19 1 - Route the suction and liquid lines from the fittings NOTE - Make sure to route copper refrigerant tubing away on the indoor coil to the fittings on the outdoor unit. from sharp edges and make sure that it does not touch other metal surfaces.
- Page 20 PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING OPERATIONS ON PREVIOUS PAGES BEFORE PROCEEDING. 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.
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Page 21: Sealing The Unit
WARNING Sealing the Unit Seal the unit so that warm air is not allowed into the cabi- Electric Shock Hazard. net. Warm air introduces moisture, which results in water Can cause injury or death. blow-off problems. This is especially important when the Foil-faced insulation conductive... - Page 22 1 - Disconnect all power supplies. 2 - Remove the air handler access panel. 3 - Route the field supply wires to the air handler electrical connection box. 4 - Use UL-listed wire nuts to connect the field supply conductors to the unit black and yellow leads, and the ground wire to ground terminal marked GND.
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Page 23: Check-Out Procedures
CHECK ELECTRIC HEAT (IF USED) IMPORTANT • Set thermostat to call for auxiliary heat (approximate- This unit is approved for installation clearance to ly 5°F above ambient temperature). The indoor blow- combustible material as stated on the unit rating er and auxiliary heat should come on together. Allow a plate. -
Page 24: Homeowner Maintenance
Lennox does not recommend the use of its air handler unit during any phase of construction. Very low return air tem- The temperature/humidity difference between the inside... -
Page 25: Sensor Maintenance
Leak Detected When the RDS Non-Communicating Blower Control Board detects a refrigerant leak: 1 - The RDS Non-Communicating Blower Control Board shuts off the (R) input (24VAC power) to the thermo- stat, which de-energizes the outdoor unit compressor and heat sources, such as gas and/or electric strip heat. - Page 26 Red LED Diagnostic Codes TABLE 6. Additional Button Functions Red diagnostic codes indicate a specific RDS Non-Com- State Press Action municating Blower Control Board issue. Yellow diagnostic Initializing Short Skips remaining pre-purge after sen- codes indicate the sensor’s position (if applicable). sors are recognized by the RDSC TABLE 4.
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Page 27: Additional Applications
a. If the thermostat maintained the settings, the Start Up Test Procedure thermostat is compatible with the RDS Non- Communicating Blower Control Board. The RDS Non-Communicating Blower Control Board is b. If the thermostat did not maintain its setpoint and/ equipped with a Test/Reset button, see “Test Button Func- or operating mode, the thermostat is not compatible tionality”... -
Page 28: Decommissioning
Diagnostic Codes and Troubleshooting TABLE 7. LED Diagnostic Codes State LED Diagnostic Code Action Required Initializing Flashing green None Solid green. Monitoring If a prior mitigation occurred, a blue flash None interrupts the solid green LED. Mitigating Check coil tubes for leak. Repair the issue and restart the equip- Flashing blue (Leak Detected) ment. -
Page 29: Integrated Control
Installing Contractor’s Name_______________________ Installing Date_______________________________ Installing Contractor’s Phone_______________________ Air Handler Model #___________________________ Job Address____________________________________ Thermostat Line Voltage SUPPLY Disconnect Switch Integrated Control Temperature Duct Blower Motor Amps System Electric Heat Amps Duct Static RETURN Filter Drain Line DUCT SYSTEM TOTAL EXTERNAL STATIC (dry coil) dry coil wet coil SUPPLY AIR DUCT... - Page 30 Installing Contractor’s Name_______________________ Installing Date_______________________________ Installing Contractor’s Phone_______________________ Air Handler Model #___________________________ Job Address____________________________________ Line Voltage Disconnect Switch Thermostat Integrated Control Duct System Duct System Filter RETURN SUPPLY Electric Heat Amps Blower motor Amps Drain Line Duct Static Temperature DUCT SYSTEM TOTAL EXTERNAL STATIC (dry coil) dry coil wet coil...
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