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CBX25UH
Service Literature
Corp. 1241-L9
December 2012
INSTALLATION AND SERVICE PROCEDURE
Revised August, 2018
CBX25UH 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
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
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 2............................
Specifications / Electrical Data 3................
Model Number Information 4...................
Blower Data 4................................
Application 6.................................
Unit Components 6............................
Optional ECB25 Electric Heat 7.................
Configuration Modification 10...................
Electrical Connections 16......................
Wiring Diagrams 17...........................
Start-Up Operations 19........................
Sequence of Operations 20....................
Performance Checklists 21.....................
The CBX25UH are high-efficiency air handler. 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
a13 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.
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