FIXED OUTDOOR AIR INTAKE DAMPER
This damper assembly is shipped inside the return air
compartment. It is completely assembled and ready for
installation. A damper baffle inside the hood is adjustable to
provide variable amounts of outdoor air intake on units that are
not provided with an economizer or motorized damper option.
Refer to Figure 3.
Gasketing and mounting screws are provided in a parts bag
attached to the hood assembly. Apply gasketing to the three
flange surfaces on the hood prior to installing the hood. Extend
gasketing approximately 6mm (1/4") beyond the top and
bottom of the two side flanges to ensure adequate sealing.
Adjusting the damper to the desired air flow may be done
before mounting the hood into position or (after installation) by
removing the front hood panel or the screen on the bottom of
the hood. Damper baffle in position 1 will allow approximately
10% recirculated air flow, position 2 approximately 15% and, to
allow approximately 25%, remove the damper baffle.
On units with bottom return air applications, install the damper
assembly over the opening in the side return air access panel.
Remove and discard the opening cover and the covering over
the hood mounting holes (used for shipping) before installing.
Secure with the screws provided.
On units with side air applications, install the damper assembly
on the return air ductwork as close to the unit as possible. Cut
an opening 406mm (16") high by 457mm (18") wide in the
ductwork to accommodate the damper. Using the holes in the
hood flanges as a template, drill 3.6mm (9/64") dia. (#26 drill)
holes into the ductwork and secure with the screws provided.
CAUTION: If outdoor air intake will not be required on units
with bottom return air applications, the damper as-
sembly should still be mounted on the side return
air access panel, per the instructions above, to en-
sure moisture is not drawn into the unit during op-
eration. The covering over the mounting holes only
need be removed. Do not remove the opening
cover.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain
line from the 25mm (1" NPT) female connection on the unit to
spill into an open drain.
An alternate drain connection (25mm [1" NPT] female
coupling) is provided inboard on the same centerline as the
exterior location.
NOTE: The condensate drain line MUST be trapped to pro-
vide proper drainage. See Figure 4.
COMPRESSORS
Units are shipped with compressor mountings factory-adjusted
and ready for operation.
CAUTION: Do Not loosen compressor mounting bolts.
FILTERS
Each unit is supplied with 51mm (2") filters. Filters must always
be installed ahead of the indoor coil and must be kept clean or
replaced with same size and type. Dirty filters reduce the
capacity of the unit and result in frosted coils or safety
shutdown. Minimum filter area and required sizes are shown in
Table 3.
SERVICE ACCESS
Access to all serviceable components is provided by the
following removable panels:
•
Compressor compartment
•
Electric Heat compartment
•
Side Supply & Return Air compartments (two panels)
•
Main control box
•
Blower compartment (three panels)
•
Filter compartment
•
Outdoor Air compartment (two panels)
Refer to Figure 7 for location of these access panels.
CAUTION: Make sure that all screws and panel latches are re-
placed and properly positioned on the unit to main-
tain an air-tight seal.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 1422mm (56") above the floor where it is not
subject to drafts, sun exposure or heat from electrical fixtures
or appliances. Follow manufacturer's instructions enclosed
with thermostat for general installation procedure. Color coded
035-18895-000-A-0902
4
Unitary Products Group
FIG. 3 - FIXED OUTDOOR AIR DAMPER
FIG. 4 - RECOMMENDED DRAIN PIPING
