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DUCT WORK
These units are adaptable to downflow use as well as rear
supply and return air duct openings. To convert to downflow,
use the following steps:
1.
Remove the duct covers found in the bottom return and
supply air duct openings. There are four (4) screws
securing each duct cover (save these screws to use in
Step 2).
2.
Install the duct covers (removed in step one) to the rear
supply and return air duct openings. Secure with the four
(4) screws used in step one.
3.
Seal duct covers with silicone caulk.
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.
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 ductwork must be insulated and
waterproofed.
NOTE: Be sure to note supply and return openings.
Refer to Figures 7 and 8 for information concerning rear and
bottom supply and return air duct openings.
ROOF CURB
On applications when a roof curb is used, the unit must be
positioned on the curb so the front of the unit is tight against
the curb.
FILTERS
Single phase units are shipped without a filter or filter racks. It
is the responsibility of the installer to secure a filter in the
return air ductwork or install a Filter/Frame Kit (1FF0110).
A filter rack and high velocity filters are standard on three
phase units.
Filters must always be used and must be kept clean. When
filters become dirt laden, insufficient air will be delivered by
6
the blower, decreasing your units efficiency and increasing
operating costs and wear-and-tear on the unit and controls.
Filters should be checked monthly; this is especially impor-
tant since this unit is used for both heating and cooling.
CONDENSATE DRAIN
A condensate trap is recommended to be installed in the con-
densate drain. The plumbing must conform to local codes.
Use a sealing compound on male pipe threads. Install the
condensate drain line (NPTF) to spill into an open drain.
SERVICE ACCESS
Access to all serviceable components is provided at the fol-
lowing locations:
•
Blower compartment access panel
•
Gas control/electrical access panel
•
Refrigerant connections
Refer to Figure 6 for location of these access locations and
minimum clearances in Table 10.
This system uses R-140A Refrigerant which oper-
ates at higher pressures than R-22. No other
refrigerant may be used in this system. Gage sets,
hoses, refrigerant containers and recovery sys-
tems must be designed to handle R-410A. If you
are unsure, consult the equipment manufacturer.
Failure to use R-410A compatible servicing equip-
ment may result in property damage or injury.
Wear safety glasses and gloves when handling
refrigerants. Failure to follow this warning can
cause serious personal injury.
Refer to Figure 16 for the R-410A Quick Reference Guide.
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 color
66433-YIM-B-1004
Unitary Products Group
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