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2010 Lennox Industries Inc.
Corp. 0906−L2
CBX40UHV
Service Literature
Revised 12/10
CBX40UHV (HFC−410A) SERIES UNITS (ICOMFORT ENABLED)
NOTICE
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Touch thermostat must be
used in communicating applications
(CBX40UHV−XXX−230−6−02 and later).
D In non−communicating applications, the Lennox
ComfortSense
®
7000 thermostat may be used, as well
as other non−communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
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.
TABLE OF CONTENTS
1. Model Number Identification 2. . . . . . . . . . . . . . . . . . . .
2. Specifications / Electrical Data 2. . . . . . . . . . . . . . . . . .
3. Blower Performance 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. I−Application 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. II−Unit Components 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. III−Optional Electric Heat 22. . . . . . . . . . . . . . . . . . . . . . .
8. IV−Optional Humidity Control 27. . . . . . . . . . . . . . . . . . .
9. V−Configuration Modifications 33. . . . . . . . . . . . . . . . . .
10. VI−Start Up Operation 36. . . . . . . . . . . . . . . . . . . . . . . .
11. VII−Operating Characteristics 36. . . . . . . . . . . . . . . . . .
12. VIII−Maintenance 37. . . . . . . . . . . . . . . . . . . . . . . . . . . .
13. IX−Configuring Unit Flow Charts 38. . . . . . . . . . . . . .
14. X−Diagrams 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CBX40UHV series units are designed to be matched with
Lennox two-stage or single-stage HFC−410A air conditioner
units and heat pumps. Several models are available in sizes
ranging from 2 through 5 tons. All units are equipped with
factory installed HFC−410A check and expansion valve for
cooling or heat pump applications.
This air handler is compatible with the ComfortSense® 7000
non−communicating thermostat and non−communicating
outdoor units. In addition, this unit has the enhance capability
of communicating with the icomfort Toucht thermostat and
compatible outdoor units using the Lennox RSBus protocols.
Optional ECB40 electric heat is available in several kW
sizes, and can be field installed in the cabinets.
This document provides service information on the
following model builds:
1. Non icomfort enabled version (CBX40UHV−XXX−
230−6−01)
2. icomfort enabled version (CBX40UHV−XXX−230−6−02)
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.
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