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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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INSTALLATION
INSTRUCTIONS
Merit
Series
®
CBK45UHVT Air Handler Units - R410A
MULTI-POSITION AIR HANDLERS
508471-01
6/2024
Table of Contents
General Information .......................................................2
Wiring Diagrams .............................................................3
BDC3 Blower Control ....................................................5
Adjusting the Blower Speed ..........................................5
Electrical Connections .................................................10
Requirements ..............................................................12
Unit Dimensions - Upflow ...........................................13
Unit Dimensions - Horiz. .............................................14
Installation Clearances ................................................15
Installation ...................................................................15
Condensate Drain.........................................................18
Duct System and Filters .............................................19
Brazing Refrigerant Lines ............................................20
Sealing the Unit ...........................................................23
Check-out Procedures .................................................23
Maintenance ................................................................23
Repairing or Replacing Cabinet Insulation ..................24
Professional Maintenance ...........................................24
Use of Air Handler During Construction .......................24
Decommissioning ........................................................25
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.
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.
Page 1
WARNING
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Summary of Contents for Lennox Merit CBK45UHVT
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS ©2024 Lennox Industries Inc. Merit Series ® Dallas, Texas, USA CBK45UHVT Air Handler Units – R410A MULTI-POSITION AIR HANDLERS 508471-01 6/2024 Table of Contents General Information ............2 Wiring Diagrams .............3 BDC3 Blower Control ............5 Adjusting the Blower Speed ..........5 Electrical Connections ..........10... -
Page 2: Shipping And Packing List
Shipping and Packing List General Information The CBK45UHVT 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 or horizon- or horizontal air discharge application (includes upflow and horizontal drain pans and preinstalled air filter). -
Page 3: Wiring Diagrams
Wiring Diagrams SYSTEM FIELD JUMPERS WARNING SINGLE STAGE AIR CONDITIONER NEED ALL TWO-STAGE AIR CONDITIONER REMOVE Y1 TO Y2 SINGLE STAGE HEAT PUMP REMOVE R TO O USE COPPER CONDUCTORS REMOVE Y1 TO Y2 AND R TWO-STAGE HEAT PUMP TO O ONLY TWO-STAGE ELECTRIC HEAT REMOVE W1 TO W2... - Page 4 WARNING USE COPPER CONDUCTORS ONLY FIGURE 2. Low Voltage Connections (Variable-Speed Motor) Page 4...
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Page 5: Bdc3 Blower Control
JUMPER SETTINGS BDC3 Blower Control IMPORTANT Before changing jumper setting, make sure the motor JP1 15 PIN has completely stopped. Any jumper setting change will PLUG (BOARD TO MOTOR) not take place while the motor is running. Table 1 lists the recommended factory blower speed tap selections for Merit CBK45UHVT series units. -
Page 6: Blower Data
NOTES - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed. First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications - minimum blower speed is 250 cfm. TABLE 3... - Page 7 NOTES - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed. First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications - minimum blower speed is 250 cfm. TABLE 5...
- Page 8 NOTES - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed. First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications - minimum blower speed is 450 cfm. TABLE 8...
- Page 9 TABLE 10. CBK45UHVT Thermostat and Two-Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity Handler System Step Status (COOL) Comments Condition pressor NO CALL FOR DEHUMIDIFICATION Normal Operation Acceptable 24 VAC - Y1 Compressor and indoor air handler follow thermostat demand Normal Operation Acceptable...
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Page 10: Electrical Connections
C- Motor runs at 100% until demand is satisfied. WARNING D- Once demand is met, motor ramps down to stop. Run 24V Class II wiring only through specified low voltage opening. Run line voltage wiring only through specified high voltage opening. Do not combine voltage 7 1/2 MIN 100% in one opening. -
Page 11: Use Copper Conductors Only
• This unit is provided with holes for conduit. Use provid- ed caps to seal holes not used. • Typical unit wiring (as well as wiring of optional field-in- stalled electric heat) is given in figure 1. Refer to the instructions provided with the electric heat section for proper installation. -
Page 12: Requirements
Lennox air handler units (with or without optional elec- it will form condensate on the cooler control box and tric heat), MUST conform with National Fire Protection As- electrical controls. -
Page 13: 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 14: Unit Dimensions - Horiz
Unit Dimensions – Horiz. 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) (559) OPENING 1-3/4 (44) (19) SUCTION 2-3/4 LINE LIQUID (70) LINE 2-3/8 4-3/8 (60) (111) VOLTAGE INLETS VOLTAGE INLETS... -
Page 15: Installation Clearances
Installation Clearances NON-DUCTED RETURN CLOSET INSTALLATION The air handler can be installed in a closet with a false bottom to form a return air plenum. It may also be installed with a return air plenum under the air handler. Louvers or return air grilles are field-supplied. Local codes may limit application of systems without a ducted return to HORIZONTAL DRAIN PAN single-story buildings. - Page 16 5 - If the unit is suspended, the entire length of the TOP CAP ROTATED TO cabinet must be supported. If you use a chain or CORRECT POSITION strap, use a piece of angle iron or sheet metal TOP CAP SCREWS CABINET SUPPORT attached to the unit (either above or below) to...
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Page 17: Downflow Application
NOTE – Be very careful when reinstalling the screws into DOWNFLOW APPLICATION the coil end plate engaging holes. Misaligned screws may NOTE – If downflow application is required, separately or- damage the coil. der kit number Y9658 (-018 through -030) or Y9659 (-036 8 - From the upflow position, flip cabinet 90º... -
Page 18: Condensate Drain
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 12. Typical Main and Overflow Drain IMPORTANT THIS CORNER SHOULD BE 5/8" (+/- 1/8") HIGHER... -
Page 19: Duct System And Filters
Lennox Product pulled through the condensate line will not allow positive Specifications bulletin. Additional information is provided drainage without a proper trap. -
Page 20: Brazing Refrigerant Lines
Technical Support Product Applications for assistance. Handle the refrigerant lines gently during the installation To obtain the correct information from Lennox, be sure to process. Sharp bends or kinks in the lines will cause a communicate the following information: Model and capac- restriction. - Page 21 1 - Route the suction and liquid lines from the fittings 5 - Braze using an alloy of silver or copper and on the indoor coil to the fittings on the outdoor unit. phosphorus with a melting point above 1,100°F Run the lines in a direct path, avoiding unnecessary (593°C).
- Page 22 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 23: Sealing The Unit
• Have all cabinet openings and wiring been sealed? Sealing the Unit • Is the indoor coil factory-installed TXV properly sized for the outdoor unit being used? Seal the unit so that warm air is not allowed into the cabi- net. -
Page 24: Repairing Or Replacing Cabinet Insulation
Use of Air Handler During Construction corrosion and, subsequently, component failure. REPAIRING DAMAGED INSULATION Lennox does not recommend the use of its air handler unit Areas of condensation on the cabinet surface are an indi- during any phase of construction. Very low return air tem- cation that the insulation is in need of repair. -
Page 25: Decommissioning
• recovery equipment and cylinders conform to the ap- Decommissioning propriate standards. Before carrying out this procedure, it is essential that the d) Pump down refrigerant system, if possible. technician is completely familiar with the equipment and e) If a vacuum is not possible, make a manifold so that all its detail. -
Page 26: 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 27 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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