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Service Literature
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.
NOTICE
A thermostat is not included and must be ordered
separately.
• In non-communicating applications, the Lennox
ComfortSense® thermostat may be used, as well as
other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field wiring for non-communicating applications is
illustrated in diagrams, which begin on page 25.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
UNIT INFORMATION
July 31, 2023
CBA25UHE (HFC- 410A) SERIES UNITS
100073
Table of Contents
Specifications and Electrical Data ..................................4
Model Number Identification ...........................................5
Blower Data ....................................................................6
Unit Components ............................................................8
ECBA25 Electric Heat Data ............................................9
Heat Section Installation ...............................................13
Configuration Modification ...........................................15
Brazing Connections ...................................................17
Installing the Condensate Drain ..................................20
Electrical Connections .................................................22
Inspecting and Replacing Filters .................................23
Wiring Diagrams ...........................................................23
Professional Maintenance ...........................................25
Check-out Procedures .................................................25
Sequence of Operation ................................................26
General Information
This indoor unit with all-aluminum coil is designed for
installation with optional field-installed electric heat and a
matched outdoor unit that is charged with HFC-410A re-
frigerant. These units, designed for indoor installation in
multiple positions, are completely assembled for upflow
and horizontal right-hand discharge before being shipped
from the factory.
All CBA25UHE air handlers are equipped with a facto-
ry-installed, internally mounted check / expansion valve,
which is suitable for use in HFC-410A applications.
This air handler is compatible with the ComfortSense®
non-communicating thermostat and any conventional
non-communicating 24VAC thermostat.
NOTE - For downflow or horizontal left-hand air discharge,
certain field modifications are required.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 25 in this
instruction for information.
Page 1
CBA25UHE
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Summary of Contents for Lennox CBA25UHE Series
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Page 1: Table Of Contents
/ expansion valve, separately. which is suitable for use in HFC-410A applications. • In non-communicating applications, the Lennox This air handler is compatible with the ComfortSense® ComfortSense® thermostat may be used, as well as non-communicating thermostat and any conventional other non-communicating thermostats. -
Page 2: Cba25Uhe Unit Dimensions - Upflow - Inches (Mm)
CBA25UHE 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) 4-3/8 (Upflow and (111) -
Page 3: Cba25Uhe Unit Dimensions - Horiz. - Inches (Mm)
CBA25UHE Unit Dimensions – Horiz. – inches (mm) 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... -
Page 4: Specifications And Electrical Data
Specifications and Electrical Data General Model Number CBA25UHE-024 CBA25UHE-030 CBA25UHE-036 CBA25UHE-042 Data Nominal tonnage Connections Suction/Vapor line (o.d.) - in. sweat Liquid line (o.d.) - in. sweat Condensate - in. fpt (2) 3/4 (2) 3/4 (2) 3/4 (2) 3/4 Indoor Net face area - ft. -
Page 5: Model Number Identification
Model Number Identification CB A 25 UH E - 030 - 230 - 01 Unit Type Minor Revision Number CB = Air Handler Refrigerant Type A = Aluminum Coil/R-410A Voltage 230 = 208/230V-1 phase-60hz Series Nominal Cooling Capacity 024 = 2 tons 030 = 2.5 tons 036 = 3 tons Blower Motor... -
Page 6: Blower Data
Blower Data CBA25UHE-024 PERFORMANCE External Air Volume / Watts at Various Blower Speeds Static Tap 1 Tap 2 Tap 3 Tap 4 Tap 5 Pressure in. w.g. Watts Watts Watts Watts Watts 0.10 1015 1054 0.20 1020 0.30 0.40 0.50 0.60 0.70 0.80... - Page 7 CBA25UHE-042 PERFORMANCE Air Volume / Watts at Various Blower Speeds External Static Tap 1 Tap 2 Tap 3 Tap 4 Tap 5 Pressure in. w.g. Watts Watts Watts Watts Watts 0.10 1275 1446 1560 1656 0.20 1233 1413 1526 1624 0.30 1199 1362...
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Page 8: Unit Components
TRANSFORMER FIGURE 3. Blower Assembly All CBA25UHE series units use a single line voltage to 24VAC transformer mounted in the control box. The COIL transformer supplies power to the control circuits in the CBA25UHE units have dual slab coils arranged in an A indoor and outdoor unit. -
Page 9: Ecba25 Electric Heat Data
ECBA25 Electric Heat Data EL ECT R I C HEAT DATA C B A 2 5U H E - 0 24 | S I N G L E P H A SE Blower Minimum Maximum Input Electric Heat Motor Circuit Overcurrent Full Load Model Number... - Page 10 EL ECT RI C H EAT DATA C B A 25 U H E - 0 30 | S I N G L E P H A SE Minimum Maximum Single Point Input Circuit Overcurrent Blower Power Source Ampacity Protection Electric Heat Motor Full Load...
- Page 11 EL ECT RI C H EAT DATA C B A 25 U H E - 0 36 | S I N G L E P H A SE Minimum Maximum Single Point Input Circuit Overcurrent Blower Power Source Ampacity Protection Electric Heat Motor Full Load...
- Page 12 EL ECT RI C HEAT DATA C B A 25U H E- 04 2 | S IN G L E PH A SE Minimum Maximum Single Point Input Circuit Overcurrent Blower Power Source Ampacity Protection Electric Heat Motor Full Load Model Number Minimum Maximum...
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Page 13: Heat Section Installation
6 - Secure the electric heater assembly into place Heat Section Installation with the screws that were removed from the heat element panel. Install two field-provided #8 SDST WARNING screws in the front of the electric heater assembly (see figure 5). Before installing or servicing unit, be sure ALL power to the unit is OFF. - Page 14 IMPORTANT NOTE - There may be only one clip securing each circuit breaker. USE COPPER CONDUCTORS ONLY BREAKER(S) MOUNTING CIRCUIT BRACKET BREAKER NOTE – Refer to the nameplate on the air handler unit for minimum circuit ampacity and maximum overcurrent protection size.
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Page 15: Configuration Modification
1 - Set the thermostat above room temperature. CIRCUIT BREAKER COVER (BACKSIDE) 2 - Check the heat pump and the heat section for normal operation. 3 - Set the thermostat to desired setting. 4 - Affix the wiring diagram sticker to air handler scroll, aligned with circuit breaker unit wiring diagram sticker. - Page 16 HORIZONTAL APPLICATION TOP CAP ROTATED TO IMPORTANT CORRECT POSITION TOP CAP SCREWS CABINET SUPPORT When removing the coil, there is possible danger of equipment damage and personal injury. Be careful when removing the coil assembly from a unit installed in right- or left-hand applications.
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Page 17: Brazing Connections
10 - Flip access door and replace it on the unit. IMPORTANT 11 - Set unit so that it is sloped toward the drain pan end If electric heat section with circuit breakers (ECBA25) is of the unit. See sloping section figure 17. Connect installed in a CBA25UHE unit in a downflow application, return and supply air plenums as required using the circuit breakers must be rotated 180°... - Page 18 Brazing alloys and flux contain materials which are NOTE - When installing refrigerant lines longer than 50 hazardous to your health. feet, see the Lennox Refrigerant Piping Design and Fab- Avoid breathing vapors or fumes from brazing operations. rication Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance.
- Page 19 REMOVE RUBBER PLUG FROM BOTH LIQUID AND SUCTION LINES PIPING NOTE — CBA25UHE SERIES UNITS USE NITROGEN OR DRY AIR PLATE AS A HOLDING CHARGE. IF THERE IS NO PRESSURE WHEN THE RUBBER PLUGS ARE REMOVED, CHECK THE COIL FOR LEAKS BEFORE INSTALLING.
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Page 20: Installing The 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 MAIN DRAIN. - Page 21 6 - Plug and check any unused drain pan openings for DUCT SYSTEM tightness. Torque plugs to 30 in. lb. to prevent water The air handler is provided with flanges for the connection leaks or seepage from the drain pan. of the plenum and ducts.
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Page 22: Electrical Connections
NOTE – Do not use soft solder. • All field wiring must be done in accordance with Nation- al Electrical Code, applicable requirements of UL and 6. Reinstall the rubber grommets after brazing is finished. local codes, where applicable. 7. Make sure outdoor unit has been put in place according to the Installation Instructions and is connected to the •... -
Page 23: Inspecting And Replacing Filters
208 VOLT CONVERSION To replace filter: 1 - Disconnect all power supplies. 1 - Loosen the thumbscrews holding the filter panel in place. 2 - Remove the air handler access panel. 2 - Slide the filter out of the guides on either side of 3 - Using the wiring diagram located on the unit access cabinet. - Page 24 Cut size: 7" Wide x 9-1/2" Tall PART NO. 537981-03 WIRING DIAGRAM - ELECTRIC HEAT 20KW HTR 3 HTR 1 HTR 2 HTR 4 SEC L SEC L SEC L SEC L HTR 2 HTR 4 HTR 3 HTR 1 PRI LS PRI LS PRI LS...
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Page 25: Professional Maintenance
PRE-START-UP CHECKS • Is the air handler properly and securely installed? Lennox does not recommend the use of its air handler unit during any phase of construction. Very low return air tem- • If horizontally configured, is the unit sloped up to 1/4... -
Page 26: Sequence Of Operation
Sequence of Operation Constant Torque Speed Blower Motor (ECM) (B3) Cooling (Cooling Only or Heat Pump) On all models, the 24 volt line will go directly to the termi- TYPICAL BLOWER MOTOR nal board from the transformer. The normally open con- (B3) REMOVAL tacts close, causing the indoor blower motor to operate;... - Page 27 The controller uses sensing devices to sense what posi- The fan motor has no programmable (On) delays but mul- tion the rotor is in at any given time. By sensing the posi- tiple (Off) delays are programmed into the motor. The off tion of the rotor and then switching the motor windings on delay is programmed into the motor and can not be ad- and off in sequence, the rotor shaft turns the blower.
- Page 28 If the motor is not running, the following checks will di- Checking the Low-Voltage Communication Input agnose whether it is operational. Always disconnect the If no low voltage communication (typically 24VAC) is mea- power to the HVAC system before disconnecting or sured at the motor on taps 1-5, check the HVAC system reconnecting any connectors to these motors.
- Page 29 Installing Contractor’s Name_______________________ Installing Date_______________________________ Installing Contractor’s Phone_______________________ Air Handler Model #___________________________ Job Address____________________________________ Thermostat Line Voltage SUPPLY Disconnect Switch Temperature Integrated Control 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...