Page 1
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.
• A Lennox communicating thermostat must be used in
communicating applications.
•
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 both communicating and non-
communicating applications is illustrated in diagrams,
which begin on page 29.
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.
CBA25UHV
IMPORTANT:
Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 30 in this
instruction for information.
Table of Contents
CBA25UHV Unit Dimensions – Upflow – inches (mm)
...2
Specifications and Electrical Data
..................................3
Model Number Identification
...........................................4
Adjusting the BDC3 Blower Control ...............................4
Adjusting the Blower Speed ..........................................4
Blower Data ....................................................................6
Application ....................................................................10
Unit Components ..........................................................10
ECBA25 Electric Heat Data
..........................................12
Heat Section Installation ...............................................17
Configuration Modification
...........................................19
Brazing Connections ...................................................22
Installing the Condensate Drain ..................................24
Electrical Connections
.................................................26
Inspecting and Replacing Filters .................................27
Wiring Diagrams ...........................................................28
Professional Maintenance ...........................................30
Check-out Procedures .................................................30
Sequence of Operation ................................................31
Service Literature
UNIT INFORMATION
Corp. 1917-L9
September 20, 2019
CBA25UHV (HFC-410A) SERIES UNITS
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 CBA25UHV 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 non-communicating
outdoor units. In addition, this unit has the enhanced ca-
pability of communicating with communicating thermo-
stats and communicating outdoor units using the Lennox
RSBus protocols.
NOTE
-
For downflow or horizontal left-hand air discharge,
certain field modifications are required.
