Lennox CBA25UH Installation Instructions Manual
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Lennox CBA25UH Installation Instructions Manual

Merit series air handler units, multi-position air handlers
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©2017 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
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.
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.
IMPORTANT INFORMATION FOR INSTALLER
This unit has a delay relay that delays the supply blower "ON" for 1 second and keeps the blower "ON" for 45
seconds on all fan and cooling demands. For more details, refer to page 17 for unit sequence of operation.
100%
2
1
CFM
1
SECOND
COOLING
DELAY
DEMAND
Page 1
INSTALLATION
INSTRUCTIONS
Merit
Series
®
CBA25UH Air Handler Units
MULTI-POSITION AIR HANDLERS
507751-01
12/2017

Table of Contents

Shipping and Packing List .............................................1
General Information .......................................................3
Requirements ................................................................3
Installation Clearances ..................................................4
Installation .....................................................................4
Condensate Drain...........................................................7
Duct System and Filters ...............................................8
Brazing Refrigerant Lines ..............................................9
Sealing the Unit ...........................................................12
Electrical Connections .................................................12
Air Flow - Cooling Blower Speed ................................15
Check-out Procedures .................................................16
Operation ....................................................................17
Homeowner Maintenance ............................................17
Professional Maintenance ...........................................18
Use of Air Handler During Construction .......................18

Shipping and Packing List

Package 1 of 1 contains:
1 - Assembled air handler unit factory-equipped for upflow
or horizontal air discharge application (includes upflow
and horizontal drain pans and preinstalled air filter).
Check the air handler for shipping damage; if found, im-
mediately contact the last carrier. Check the unit rating
plate to confirm that delivered unit matches order.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 18 in this
instruction for information.
3
4
100%
CFM
OFF
45
SECS

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Summary of Contents for Lennox CBA25UH

  • Page 1: Table Of Contents

    CBA25UH Air Handler Units MULTI-POSITION AIR HANDLERS 507751-01 12/2017 Table of Contents Shipping and Packing List ..........1 CBA25UH Unit Dimensions – Upflow – Inches (mm) ..2 General Information ............3 Requirements ..............3 Installation Clearances ..........4 Installation ..............4 Condensate Drain............7 Duct System and Filters ..........8 Brazing Refrigerant Lines ..........9...

  • Page 2: Cba25Uh Unit Dimensions - Upflow - Inches (Mm)

    CBA25UH Unit Dimensions – Upflow – Inches (mm) 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)

  • Page 3: General Information

    These units must be installed as a in a warm, humid place. When the unit is installed in part of a matched system as outlined in the CBA25UH an unconditioned space, apply sealant around electrical Product Specification bulletin.

  • Page 4: Installation Clearances

    Louvers or return air grilles are field-supplied. Local codes may limit application of systems without a ducted return to single-story buildings. When a CBA25UH unit is installed in a closet with a lou- vered return opening, the minimum open area for the lou- HORIZONTAL DRAIN PAN...
  • Page 5 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.
  • Page 6 If electric heat section with circuit breakers (ECB29/ NOTE – For horizontal applications in high humidity ar- ECB31) is installed in a CBA25UH unit in a downflow eas, remove the downflow rail closest to the drain pan. To application, the circuit breakers must be rotated 180°...

  • Page 7: 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 8: Duct System And Filters

    Confirm primary and secondary drains are open. 2 - Check the installed drain pan. Drain pan must be 1 - CBA25UH units are equipped with a drain pan, which draining completely. Drain line fittings must not be includes green (main drain) and red (secondary leaking.

  • Page 9: 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 10 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 11 REMOVE ACCESS PANEL REMOVE RUBBER PLUG FROM BOTH LIQUID AND SUCTION LINES NOTE - CBA25UH SERIES UNITS USE NITROGEN OR DRY AIR PIPING AS A HOLDING CHARGE. IF THERE IS NO PRESSURE WHEN PLATE THE RUBBER PLUGS ARE REMOVED, CHECK THE COIL FOR LEAKS BEFORE INSTALLING.

  • Page 12: 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 13 208 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 14 FIGURE 14. Typical Wiring Diagram – CBA25UH Air Handler with Electric Heat Page 14...

  • Page 15: 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 16: Check-Out Procedures

    All downflow applications run on high speed when utilizing electric heat. 4-PIN BLOWER CONNECTOR FIGURE 16. Changing Blower Speed TABLE 2. CBA25UH Blower Performance (3-Speed PSC) – 240V (CFM @ ESP. – in. W. C.) Air Handler Blower Speed .10" WC .20" WC .30"...

  • Page 17: Operation

    • Is the wiring neat, correct, and in accordance with the contactor in the outdoor unit, starting the compressor and wiring diagram? outdoor fan motor. On heat pumps, circuit R and O energizes the reversing • Is the unit properly grounded and protected (fused)? valve, switching the valve to the cooling position.

  • Page 18: Repairing Or Replacing Cabinet Insulation

    Use of Air Handler During Construction is damaged (wet, ripped, torn or separated from the cabi- Lennox does not recommend the use of its air handler unit net walls), the surrounding ambient air will affect the inside during any phase of construction. Very low return air tem- surface temperature of the cabinet.
  • Page 19 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 20 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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