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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.
CBA25UHE
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 25 in this
instruction for information.
Table of Contents
CBA25UHE Unit Dimensions – Upow – inches (mm)...2
CBA25UHE Unit Dimensions – Horiz. – inches (mm) ....3
Specications and Electrical Data ..................................4
Model Number Identication ...........................................5
Blower Data ....................................................................6
Unit Components ............................................................8
ECBA25 Electric Heat Data ............................................9
Heat Section Installation ...............................................13
Conguration Modication ........................................... 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
Constant Torque Speed Blower Motor (ECM) (B3) ....26
Service Literature
UNIT INFORMATION
100073
July 31, 2023
CBA25UHE (HFC-410A) SERIES UNITS
General Information
This indoor unit with all-aluminum coil is designed for
installation with optional eld-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 upow
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 downow or horizontal left-hand air discharge,
certain eld modications are required.
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