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©
2018 Lennox Industries Inc.
CBX25UH (-10)
Service Literature
Corp. 1504-L6
September 2018
INSTALLATION AND SERVICE PROCEDURE
CBX25UH (-10) Series
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
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 pro
tective clothing
.
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.
Table of Contents
Unit Dimensions
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data
. . . . . . . . . . . . . . . .
Model Number Information
. . . . . . . . . . . . . . . . . . .
Blower Data
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Components
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional ECB25 Electric Heat
. . . . . . . . . . . . . . . . .
Configuration Modification
. . . . . . . . . . . . . . . . . . .
Electrical Connections
. . . . . . . . . . . . . . . . . . . . . .
Wiring Diagrams
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up Operations
. . . . . . . . . . . . . . . . . . . . . . . .
Sequence of Operations
. . . . . . . . . . . . . . . . . . . .
Performance Checklists
. . . . . . . . . . . . . . . . . . . . .
The CBX25UH units are high-efficiency air handlers. Several
models are available in sizes ranging from 1‐1/2 through
5-tons. The CBX25UH is designed for HFC-410A refrigerant.
CBX25UH series units are designed to be matched with either
a 13 SEER air conditioner or heat pump, but can be matched
with other air conditioners or heat pumps as noted in the rating
information. See Product Specification bulletin.
This air handler is designed for indoor installation only. As
shipped, the unit is ready for installation in either upflow or
horizontal left-hand. Field modifications are required for
right-hand air discharge applications. Electric heat, down
flow air discharge application kits, air filters and other
various accessories are available and listed in the
CBX25UH Product Specification bulletin
for ordering
.
All units come with a factory installed check/expansion
valve.
Information contained in this manual is intended for use by
experienced licensed HVAC service technicians only. All
specifications are subject to change. Procedures outlined in
this manual are presented as a recommendation only and do
not supersede or replace local or state codes.
