Specifications

BAROMETRIC RELIEF / FIXED OUTDOOR AIR
INTAKE DAMPER ASSEMBLY
This damper assembly is shipped inside of the return air
compartment. It serves as a barometric relief damper on units
with economizer or as a fixed outdoor air intake damper on
units less economizer.
On units with bottom return, install the damper assembly over
the opening in the side return air duct cover. (See Figure 2.)
Remove the adhesive backed label covering this opening
before installing the damper assembly.
On units with side return, install the damper assembly in the
return air ductwork as close to the unit as possible. Cut an
opening 11-1/2" high by 17-1/2" wide in the ductwork to
accommodate the damper device.
Attach the damper assembly into position by drilling six (6)
holes, 9/64" dia. (#26 drill), using the holes in the hood flanges
as a template and secure with the screws provided.
On units less economizer, adjust the damper to the desired air
flow opening by moving the damper bracket (inside of the hood)
to one of the 3 positions provided. Position 1 will allow
approximately 25% recirculated air flow, position 2
approximately 15% and position 3 approximately 10%. A screw
on each side of the hood secures this bracket in place.
FILTERS
2" filters are supplied with each unit. 1" replacement filters may
be used with no modification to the filter racks. Filters must
always be installed ahead of the evaporator coil and must be
kept clean or replaced with same size and type. Dirty filters will
reduce the capacity of the unit and will result in frosted coils or
safety shutdown. Minimum filter area and required sizes are
shown in Table 2.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain line
from the 3/4" female connection on the unit to spill into an open
drain.
NOTE: The condensate drain line MUST be trapped to provide
proper drainage. See Figure 3.
SERVICE ACCESS
Access to all serviceable components is provided by five
removable panels:
• Compressor compartment
• Heater compartment
• Blower compartment
• Main control box
• Filter compartment
Refer to Figure 7 for location of these access panels.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 56" above the floor where it will not be 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
insulated wires (#18 AWG) should be used to connect
thermostat to unit. Five conductors are required for cooling
units with no electric heat - seven are required for cooling units
with electric heat.
FIG. 2 - BAROMETRIC RELIEF / FIXED OUTDOOR
AIR DAMPER ASSEMBLY
FIG. 3 - RECOMMENDED DRAIN PIPING
530.18-N9Y
4 Unitary Products Group