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2002 Lennox Industries Inc.
Corp. 0206−L3
CBX32MV
Service Literature
Revised 02−2010
CBX32MV (HFC−410A) SERIES UNITS
TABLE OF CONTENTS
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification.. 2. . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data 2. . . . . . . . . . . . . . . . . .
Blower Performance 4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
I− Application 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II− Unit Components 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
III− Troubleshooting the Variable Speed Motor 15. . . . .
IV− Optional Electric Heat 17. . . . . . . . . . . . . . . . . . . . . . .
V− Optional Humidity Control 23. . . . . . . . . . . . . . . . . . . .
VI− Configuration Modifications 30. . . . . . . . . . . . . . . . . .
VII− Start Up Operation 34. . . . . . . . . . . . . . . . . . . . . . . . .
VIII− Operating Characteristics 35. . . . . . . . . . . . . . . . . .
XI− Maintenance 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
X− Wiring and Operation Sequence 36. . . . . . . . . . . . . .
Introduction
The CBX32MV is a high efficiency residential split system
blower/coil featuring a variable speed motor controlled by an
electronic blower drive control (BDC).
CBX32MV series units are designed to be matched with
Lennox two-speed or single-speed HFC−410A condensing
units and heat pumps. Several models are available in sizes
ranging from 1.5 through 5 tons. All units are equipped with
factory installed check and expansion valve for cooling or heat
pump applications.
Electric heat is available in several voltages and KW sizes,
and can be field installed in the cabinet.
Some CBX32MV applications may include the optional
Lennox ComfortSense
®
7000, SignatureStatt or
Efficiency Plus Comfort Management Control (CCB1). The
purpose of both controls is to vary indoor blower speed in
response to indoor dehumidification demand. When a
two-speed outdoor unit is used, compressor speed can
also be controlled by the SignatureStat or CCB1 in
response to indoor dehumidification demand.
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.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal-
lation and service to protect the unit’s electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electro-
static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
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