©2023 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.
WARNING
To prevent serious injury or death:
1. Lock-out/tag-out before performing maintenance.
2. If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove fan
belt where applicable, and ensure all controllers
and thermostats are set to the “OFF” position before
performing maintenance.
3. Always keep hands, hair, clothing, jewelry, tools, etc.
away from moving parts.
INSTALLATION
INSTRUCTIONS
MULTI-POSITION AIR HANDLERS
508370-01
6/2023
Merit
®
Series
CBA25UHE Air Handler Units
Shipping and Packing List
Package 1 of 1 contains:
1 – Assembled air handler unit factory-equipped for upow
or horizontal air discharge application (includes upow
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 conrm that delivered unit matches order.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 19 in this
instruction for information.
Table of Contents
Unit Dimensions – Upow Position.................................2
Unit Dimensions – Horizontal Position ..........................3
General Information .......................................................4
Requirements ................................................................4
Installation Clearances ..................................................5
Installation .....................................................................5
Condensate Drain...........................................................8
Duct System and Filters ...............................................9
Brazing Refrigerant Lines ............................................ 10
Sealing the Unit ...........................................................13
Electrical Connections ................................................. 13
Air Flow – Cooling Blower Speed ................................ 16
Blower Data ................................................................17
Check-out Procedures .................................................18
Operation ....................................................................18
Homeowner Maintenance ............................................19
Repairing or Replacing Cabinet Insulation ..................19
Professional Maintenance ...........................................19
Use of Air Handler During Construction .......................19
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