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CBX25UHV
Service Literature
Corp. 1323-L6
August 2018
INSTALLATION AND SERVICE PROCEDURE
CBX25UHV 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.
WARNING
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Information
. . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data
3
. . . . . . . . . . . . . . . .
Adjusting the BDC3 Blower Control
. . . . . . . . . . . .
Adjusting the Blower Speed
. . . . . . . . . . . . . . . . . .
I Application
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components
. . . . . . . . . . . . . . . . . . . . . . . . .
III Optional Electric Heat
. . . . . . . . . . . . . . . . . . . .
IV Configuration Modification
. . . . . . . . . . . . . . . .
V Electrical Connections
. . . . . . . . . . . . . . . . . . . .
VI Wiring Diagrams
. . . . . . . . . . . . . . . . . . . . . . . . .
VII Performance Checklists
. . . . . . . . . . . . . . . . . .
VIII Sequence of Operations
. . . . . . . . . . . . . . . . .
The CBX25UHV series units are high efficiency blower coils.
Several models are available in sizes ranging from 1‐1/2
through 5 tons. The CBX25UHV is designed for HFC-410A
refrigerant only.
CBX25UHV series units are designed to be matched with the
13SEER air conditioner and heat pump line, but can be
matched with other air conditioners or heat pumps as noted in
the rating information. See Product Specification bulletin.
The CBX25UHV air handler is designed for indoor
installation only. The unit comes ready to install in either
up-flow or horizontal left-hand applications. Field
modifications are required for right-hand air discharge
applications. Electric heat and other accessories are
available and are listed in the
CBX25UHV Product
Specification
bulletin
.
IMPORTANT
On some pans, the primary (main) and secondary drain
holes have knockouts.
Confirm primary (main) and secondary drains are open.
IMPORTANT INFORMATION TO INSTALLER
The thermostatic expansion valve (TEV) with check
valve sensing bulb is shipped inside the unit cabinet.
This sensing bulb must be re-installed in a proper
location outside of the cabinet. See page 22 for details.
Information contained in this manual is intended for use by
experienced 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.
