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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
CBX25UH 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 CBX25UH
Product Specification 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.
All models are designed for indoor installation only. The
installation of the air handler, field wiring, duct system,
etc. must conform to the requirements of any state laws,
and local ordinances (including 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.
The air handler is shipped from the factory completely as-
sembled. The unit is provided with flanges 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,
filters, duct system, wiring, and accessibility for service.
Refer to the rating plate on the air handler for specific in
-
formation.
WARNING
Danger of explosion. Keep flammable
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 floor for a garage installation.
Failure to follow these instructions can result
in death, explosion, or fire.
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/filter compartment and blower/control
compartment.
NOTES –
During cooling operation, excessive sweating may occur
if the air handler is installed in a warm and humid space.
If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.
Electrical wires should be sealed on the inside where they
exit the conduit opening. Sealant is required to prevent air
leakage into, and condensate from forming inside of, the
air handler, the control box, and on the electrical controls.
Installation Clearances
NON-DUCTED RETURN CLOSET INSTALLATION
The air handler can be installed in a closet with a false
bottom to form a return air plenum. It may also be installed
with a return air plenum under the air handler.
Louvers or return air grilles are field-supplied. Local codes
may limit application of systems without a ducted return to
single-story buildings.
When a CBX25UH unit is installed in a closet with a lou-
vered return opening, the minimum open area for the lou-
vers will be:
• 2065 square centimeters for -018 and -024 models;
• 2323 square centimeters for -030 and -036 models;
• 2903 square centimeters for -042 thru -060 models
If the free area is not known, assume a 25% free area for
wood or a 75% free area for metal louvers or grilles. Using
the louver dimensions and the 25% or 75% assumption,
determine if the open area meets the minimum open area
listed above.