9
PREPARING JOB SITE FOR UNIT INSTALLATION — To
save time and to reduce the possibility of costly errors, set up a
complete sample installation in a typical room at the job site.
Check all critical dimensions such as pipe, wire, and duct
connections requirements. Refer to job drawings and product
dimension drawings as required. Instruct all trades in their parts
of the installation. Units must be installed in compliance with
all applicable local code requirements.
IDENTIFYING AND PREPARING UNITS — Ensure the
power requirements match the available power source. Refer to
the unit nameplate and wiring diagram. In addition:
• Check all tags on the unit to determine if shipping screws
are to be removed. Remove screws as directed.
• Rotate the fan wheel by hand to ensure that the fan is
unrestricted and can rotate freely. Check for shipping
damage and fan obstructions. Adjust blower motor as
required.
Step 2 — Position the Unit —
Install the unit in a location that meets the following
requirements:
• Allow adequate space for installation, service clearance,
piping and electrical connections, and necessary
ductwork. For specific unit dimensions, refer to Table 2,
and Figs. 2 and 3. Allow clearance according to local and
national codes.
• Confirm that the ceiling is able to support the weight of
the unit. See Table 2 for nominal weight.
• There should be enough room within the false ceiling for
installation and maintenance. See Fig. 9 and 10.
• The false ceiling should be horizontal and leveled.
• Install the unit in a location within the room that allows
uniform air flow in all directions.
Fig. 9 —False Ceiling Installation
Select the unit position with the following points in mind:
• The unit should be installed in a position that is suitable
to support the total weight of the unit, refrigerant piping,
and condensate.
• Proper access should be provided for maintenance for
refrigerant piping, EEV (electronic expansion valve),
electrical box, and condensate pump. A 2-ft clearance is
recommended all around the unit.
Fig. 10 —Maintenance Space Requirements
• The unit should not be positioned directly above any
obstruction.
• The unit must be installed square and level.
IMPORTANT: Ensure the ceiling grid is supported
separately from the unit. The ceiling grid must not be
supported by any part of the unit or any associated wiring or
piping work.
Step 3 — Mount the Unit —
INSTALLING HANGER BOLTS — Install the hanger bolts at
the locations shown in Fig. 2. Use 3/8-in. all-threaded rod. For
unit weight, see Table 2.
MOUNTING UNIT — The unit can now be lifted on to the
hanging rods for mounting.
1. Use rods and fasteners to suspend the unit at the factory-
provided mounting holes.
2. Adjust the height of the unit until the bottom is level with
the false ceiling. Make sure there is adequate space to
provide enough pitch for the drain.
3.
Secure the unit in position with locknuts and washers on
both sides of the mounting bracket. Ensure that the
threaded rod does not protrude more than two inches
below the mounting brackets as shown in Fig. 11
.
Fig. 11 —Threaded Rod
INSTALLING DUCT — Connect the return and supply ducts
to the duct collars provided on the unit. Adequate distance
between the return and supply diffusers should be maintained
to avoid short circulation of air within the space. The filter is
located on the return side (rear) of the unit.
DANGER
Units must not be installed where they may be exposed to
potentially explosive or flammable atmosphere. If this
instruction is not followed exactly, a fire or explosion may
result, causing property damage, injury, or loss of life.