173858-YIM-A-0306
Unitary Products Group
5
Duct work should be designed and sized according to the
methods of the Air Conditioning Contractors of America
(ACCA), as set forth in their Manual D.
A closed return duct system shall be used. This shall not pre-
clude use of economizers or ventilation air intake. Flexible
joints may be used in the supply and return duct work to min-
imize the transmission of noise.
NOTE:
Be sure to note supply and return openings.
Refer to Figure 3 for information concerning rear and bottom
supply and return air duct openings.
FILTERS
A filter rack and filters are standard on all units.
Filters must always be used and must be kept clean. When
filters become dirt laden, insufficient air will be delivered by
the blower, decreasing your units efficiency and increasing
operating costs and wear-and-tear on the unit and controls.
Filters should be checked monthly especially since this unit
may be used for both heating and cooling.
CONDENSATE DRAIN
A condensate trap is required to be installed in the conden-
sate drain. The plumbing must conform to local codes. Use a
sealing compound on male pipe threads. Install the conden-
sate drain line (3/4“ NPTF) to spill into an open drain.
SERVICE ACCESS
Access to all serviceable components is provided by the fol-
lowing removable panels:
•
Blower service access
•
Electrical/filter access
•
Compressor service access
Refer to Figure 3 for location of these access panels and min-
imum clearance.
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
the thermostat for general installation procedure. Four or five
color coded insulated wires (minimum #18 AWG) should be
used to connect thermostat to unit. See Figure 2.
When fastening duct work to the side duct flanges
on the unit, insert the screws through the duct
flanges only. DO NOT insert the screws through the
casing. Outdoor duct work must be insulated and
waterproofed.
