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General Information
The CBA25UH series air handler with all-aluminum
coil is designed for indoor installation only. As shipped,
the unit is ready for installation in either upow, horizontal
left-hand or right-hand air discharge applications. Electric
heat, downow air discharge kits, air lters and other ac-
cessories are available and listed in the CBA25UH Prod-
uct Specication bulletin for ordering.
This instruction is intended as a general guide and does
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation.
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
protective clothing.
Requirements
WARNING
Excessive Weight Hazard - Use two or more people
when moving and installing the unit. Failure to do so can
result in back or other type of injury.
IMPORTANT
CBA25UH units include a factory-installed check/
expansion valve which will provide optimal refrigerant
control and system performance with outdoor units of
varying capacities. These units must be installed as a
part of a matched system as outlined in the CBA25UH
Product Specication bulletin.
These instructions are intended as a general guide and do
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation.
Compliance with all local, state, or national codes pertain-
ing to this type of equipment should be determined prior
to installation. Read this instruction manual, as well as the
instructions supplied in separate equipment, before start-
ing the installation.
In addition to conforming to manufacturer’s installation in-
structions and local municipal building codes, installation
of Lennox air handler units (with or without optional elec-
tric heat), MUST conform with National Fire Protection As-
sociation (NFPA) standards: “Standard for Installation of
Air Conditioning and Ventilation Systems” (NFPA No. 90A)
and “Standard for Installation of Residence Type Warm Air
Heating and Air Conditioning Systems” (NFPA No. 90B).
All models are designed for indoor installation only. The
installation of the air handler, eld wiring, duct system, etc.
must conform to the requirements of the National Electri-
cal Code, ANSI/NFPA No. 70 (latest edition) in the United
States, and any state laws, and local ordinances (includ-
ing plumbing or waste water codes).
Local authorities having jurisdiction should be consulted
before installation is made. Such applicable regulations or
requirements take precedence over the general instruc-
tions in this manual.
Install the conditioned air plenum, ducts and air lters
(provided) in accordance with NFPA 90B Standard for the
Installation of Warm Air Heating and Air-Conditioning Sys-
tems (latest edition).
The air handler is shipped from the factory completely as-
sembled. The unit is provided with anges for the connec-
tion of the duct system.
Do not remove the cabinet knockouts until it has been de-
termined which knockouts will need to be removed for the
installation.
Select the air discharge position which best suits the site
conditions. Consider required clearances, space, routing
requirements for refrigerant line, condensate disposal,
lters, duct system, wiring, and accessibility for service.
Refer to the rating plate on the air handler for specic in-
formation.
WARNING
Danger of explosion. Keep ammable
materials and vapors, such as gasoline, away
from air handler. Place air handler so that
heating elements are at least 18 inches (46
cm) above the oor for a garage installation.
Failure to follow these instructions can result
in death, explosion, or re.
IMPORTANT
Excessive condensation may occur if the unit is installed
in a warm, humid place. When the unit is installed in
an unconditioned space, apply sealant around electrical
wires, refrigerant piping and condensate lines at the
point where they enter the cabinet.
Apply sealant on the inside of the cabinet at the
point where the electrical wires exit through the
conduit opening. This will also keep warm and moist
unconditioned air out of the air handler cabinet where
it will form condensate on the cooler control box and
electrical controls.
IMPORTANT
This unit is approved for installation clearance to
combustible material as stated on the unit rating
plate. Accessibility and service clearances must take
precedence over combustible material clearances.
The air handler must be installed so that free access is
allowed to the coil/lter compartment and blower/control
compartment.
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