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©2024 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
IMPORTANT
If installing in an R454B application, R454B air handler
sensor kit (27J27), Refrigerant Detection System Control
(27A02) and R454B TXV (26Z70, 26Z71, or 26Z72)
must be ordered. If installing in R454B application, use
installation instructions provided in R454B air handler
sensor kit (27J27).
For sensor maintenance recommendations, refer to the
instructions in kit 27J27.
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.
WARNING
Maximum Altitude of application is 3200m above sea
level.
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Disponible en Français sur le LennoxPros.com site
INSTALLATION
INSTRUCTIONS
Merit
Series
®
CBK45UHPT Air Handler Units - R410A
MULTI-POSITION AIR HANDLERS
508469-01
6/2024
Table of Contents
General Information .......................................................2
Wiring Diagrams ............................................................3
Air Flow - Cooling Blower Speed ..................................4
Requirements ................................................................5
Unit Dimensions - Upflow .............................................7
Installation Clearances ..................................................8
Installation .....................................................................8
Condensate Drain......................................................... 11
Duct System and Filters .............................................12
Brazing Refrigerant Lines ............................................13
Sealing the Unit ...........................................................16
Electrical Connections .................................................16
Check-out Procedures .................................................17
Operation ....................................................................18
Homeowner Maintenance ............................................18
Repairing or Replacing Cabinet Insulation ..................19
Professional Maintenance ...........................................19
Use of Air Handler During Construction .......................19
Decommissioning ........................................................20
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.
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.
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.
Page 1
WARNING
IMPORTANT
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Related Manuals for Lennox Merit CBK45UHPT Series
Summary of Contents for Lennox Merit CBK45UHPT Series
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Merit Series ® Dallas, Texas, USA CBK45UHPT Air Handler Units – R410A MULTI-POSITION AIR HANDLERS 508469-01 6/2024 Table of Contents General Information ............2 Wiring Diagrams ............3 Air Flow – Cooling Blower Speed ........4 Requirements ..............5 Unit Dimensions –... -
Page 2: Shipping And Packing List
Shipping and Packing List General Information The CBK45UHPT series air handler with all-aluminum Package 1 of 1 contains: coil is designed for indoor installation only. As shipped, 1 – Assembled air handler unit factory-equipped for upflow the unit is ready for installation in either upflow, horizontal or horizontal air discharge application (includes upflow and horizontal drain pans and preinstalled air filter). -
Page 3: Wiring Diagrams
Wiring Diagrams PART NO. 537980-03 WIRING DIAGRAM - ELECTRIC HEAT HTR 2 HTR 2 PRI LS PRI LS 20KW HTR 4 HTR 3 HTR 2 HTR 1 SEC L SEC L SEC L SEC L HTR 4 HTR 3 HTR 2 HTR 1 PRI LS PRI LS... -
Page 4: Air Flow - Cooling Blower Speed
THERMOSTAT AIR HANDLER THERMOSTAT AIR HANDLER NOTE NOTE HEAT ONLY APPLICATION CONDITIONER THERMOSTAT HEAT PUMP UNIT UNIT AIR HANDLER COOLING ONLY APPLICATION THERMOSTAT AIR HANDLER CONNECT COMMON WIRE ONLY IF REQUIRED (REFER TO THE APPROPRIATE THERMOSTAT INSTALLATION INSTRUCTIONS) NOTE HEAT PUMP APPLICATION WITH AIR CONDITIONER ELECTRIC HEAT UNIT... - Page 5 BLOWER RELAY PLASTIC CAPS NOTE - Refer to wiring diagram located on the BLOWER RELAY unit HARNESS ance (table 2). BLUE (MED) RED (L0) All air data measured external to unit with 1 inch non-pleated air filter in place. BLACK (HI) All factory settings are medium speed.
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Page 6: Requirements
In addition to conforming to manufacturer’s installation in- structions and local municipal building codes, installation of Lennox air handler units (with or without optional elec- tric heat), MUST conform with National Fire Protection As- sociation (NFPA) standards: “Standard for Installation of Air Conditioning and Ventilation Systems”... -
Page 7: Unit Dimensions - Upflow
Unit Dimensions – Upflow 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) VOLTAGE... -
Page 8: Installation Clearances
NOTES – REFRIGERANT METERING DEVICE CBK45UHPT units are equipped with a factory-installed During cooling operation, excessive sweating may occur check/ expansion valve. if the air handler is installed in a warm and humid space. UPFLOW APPLICATION If installed in an unconditioned space, sealant should be applied around the electrical wires, refrigerant tubing, and 1 - The air handler must be supported on the bottom condensate lines where they enter the cabinet. - Page 9 RIGHT-HAND DISCHARGE IMPORTANT 1 - Determine which plugs are required for drain line After removal of drain pan plug(s), check drain hole(s) connections. to verify that drain opening is fully open and free of any 2 - With access door removed, remove drain line plugs debris.
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Page 10: Downflow Application
11 - Set unit so that it is sloped 1/4ʺ toward the drain pan end of the unit. Connect return and supply air plenums as required using sheet metal screws. 12 - If suspending the unit, it must be supported along the entire length of the cabinet. -
Page 11: 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 12: Duct System And Filters
(primary) drain. The condensate drain is on the against the data given in the appropriate Lennox Product negative pressure side of the blower; therefore, air being Specifications bulletin. Additional information is provided pulled through the condensate line will not allow positive in Service and Application Note ACC002 (August 2000).. -
Page 13: Brazing Refrigerant Lines
INSTALLING DUCT SYSTEM WARNING Connect supply air duct to the flange on top of the air han- dler. If an isolation connector is used, it must be nonflam- Polyol ester (POE) oils used with HFC-410A refrigerant mable. absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. - Page 14 Technical Support Product Applications for assistance. 5 - Braze using an alloy of silver or copper and To obtain the correct information from Lennox, be sure to phosphorus with a melting point above 1,100°F communicate the following information: Model and capac- (593°C).
- Page 15 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 16: 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 17: Use Copper Conductors Only
208 VOLT CONVERSION WARNING 1 - Disconnect all power supplies. USE COPPER CONDUCTORS ONLY 2 - Remove the air handler access panel. 3 - Using the wiring diagram located on the unit access 1 - Disconnect all power supplies. panel as a reference, move the 2 connected black 2 - Remove the air handler access panel. -
Page 18: Operation
CHECK BLOWER OPERATION between R and Y is completed, closing the circuit to the contactor in the outdoor unit, starting the compressor and • Set thermostat to FAN ON. outdoor fan motor. • The indoor blower should come on. On heat pumps, circuit R and O energizes the reversing CHECK COOLING OPERATION valve, switching the valve to the cooling position. -
Page 19: Repairing Or Replacing Cabinet Insulation
(surrounding ambient temperature and humidity) and the varying conditions inside the unit. If the insulation barrier Lennox does not recommend the use of its air handler unit is damaged (wet, ripped, torn or separated from the cabi- during any phase of construction. Very low return air tem-... -
Page 20: Decommissioning
d) Pump down refrigerant system, if possible. Decommissioning e) If a vacuum is not possible, make a manifold so that Before carrying out this procedure, it is essential that the refrigerant can be removed from various parts of the technician is completely familiar with the equipment and system. -
Page 21: 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 22 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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