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MERIT
®
CBX25UHV SERIES
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
Merit
®
CBX25UHV units include a factory-installed
check/expansion valve which provides optimal refriger
ant control and system performance with outdoor units
of varying capacities. These units must be installed as
part of a matched system as outlined in the CBX25UHV
Product Specification bulletin.
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
.
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
pertaining 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
starting the installation.
In addition to conforming to manufacturer's installation
instructions and local municipal building codes, installation
of Lennox air handler units (with or without optional electric
heat), MUST conform with National Fire Protection
Association (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, field wiring, duct system, etc.
must conform to the requirements of the National Electrical
Code, ANSI/NFPA No. 70 (latest edition) in the United
States, and any state laws, and local ordinances (including
plumbing or wastewater codes). Local authorities having
jurisdiction should be consulted before installation is
made. Such applicable regulations or requirements take
precedence over the general instructions in this manual.
Install the conditioned air plenum, ducts and air filters
(provided) in accordance with NFPA 90B Standard for the
Installation of Warm Air Heating and Air-Conditioning
Systems (latest edition).
The air handler is shipped from the factory completely
assembled. This unit is provided with flanges for
connecting the supply plenum.
Do not remove the cabinet knockouts until it has been
determined 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
information.
WARNING
Danger of explosion. Keep flammable ma
terials 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 installa
tion. 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 open
ing. Sealing the cabinet in this way prevents warm,
moist, unconditioned air from entering the cabinet.
Warm, moist air in the cabinet forms condensate on the
cooler control box and electrical controls.
IMPORTANT
This unit is approved for installation clearance to com
bustible material as stated on the unit rating plate. Ac
cessibility 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.
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 Merit
®
CBX25UHV unit is installed in a closet with
a louvered return opening, the minimum open area for the
louvers will be:
●
320 square inches for -018 and -024 models;
●
360 square inches for -030 and -036 models;
●
450 square inches for -042 thru -060 models.
