Lennox CBA25UHV User Manual

©2021 Lennox Industries Inc.
Dallas, Texas, USA
Page 1
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.
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.
INSTALLATION
INSTRUCTIONS
MULTI-POSITION AIR HANDLERS
507775-02
2/2021
Merit
®
Series
CBA25UHV Air Handler Units
Shipping and Packing List
Package 1 of 1 contains:
1 – Assembled air handler unit factory-equipped for upow
or horizontal air discharge application (includes upow
and horizontal drain pans and preinstalled air lter).
Check the air handler for shipping damage; if found, im-
mediately contact the last carrier. Check the unit rating
plate to conrm that delivered unit matches order.
General Information
The CBA25UHV series air handler with all-aluminum
coil is designed for indoor installation only. As shipped,
the unit is ready for installation in either upow or horizon-
tal right-hand air discharge applications. Horizontal drain
pan may be repositioned in the eld to allow installation
in the horizontal left-hand air discharge position. Various
accessories are available and listed in the CBA25UHV
Product Specication bulletin (EHB) for ordering.
This instruction is intended as a general guide and does
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 22 in this
instruction for information.
Table of Contents
CBA25UHV Unit Dimensions – Upow – Inches (mm) ..2
Requirements ................................................................3
Installation Clearances ..................................................3
Installation .....................................................................4
Condensate Drain...........................................................7
Duct System and Filters ...............................................8
Brazing Refrigerant Lines .............................................. 9
Sealing the Unit ...........................................................12
Electrical Connections ................................................. 12
BDC3 Blower Control ..................................................16
Adjusting the Blower Speed ........................................16
Check-out Procedures .................................................21
Maintenance ................................................................21
Repairing or Replacing Cabinet Insulation ..................21
Professional Maintenance ...........................................22
Use of Air Handler During Construction .......................22

Lennox CBA25UHV Specifications

General

Brand	Lennox
Model	CBA25UHV
Category	Air Handlers
Language	English