CLEARANCES
All units require certain clearances for proper operation and
service. Refer to Figure 3 for the clearances required for
combustion, construction, servicing and proper unit opera-
tion.
WARNING: Do not permit overhanging structures or shrubs to
obstruct the condenser air discharge outlet.
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 secur-
ing each duct cover (save these screws to use later).
2. Install the duct covers, removed in step one, to the rear sup-
ply and return air duct openings. Secure with the four (4)
screws used in step one.
3. Seal duct covers with silicone caulk.
Downflow units must have an “L”-shaped supply duct without
any outlets or registers located below the outlet of the unit.
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 mini-
mize the transmission of noise.
CAUTION: 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.
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
Single phase units are shipped without a filter and is the responsi-
bility of the installer to secure a filter in the return air ductwork or
install a Filter/Frame Kit (1FF0114).
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
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 is
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.
035-16004-001-A-0202
Unitary Products Group
3
FIG. 2 - TYPICAL FIELD WIRING DIAGRAM
POWER WIRING
R
G
W
R
C
Y
Y
W 2
C
W 1
O
O
G
24 VOLT TRANSFORMER
UNIT TERMINAL STRIP
THERMOSTAT
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can
cause improper and dangerous operation. Verify proper operation after servicing.
** = Minimum wire size of 18 AWG
wire should be used for all field
installed 24 volt wire.
**
* = Only required on units with
supplemental electric heat.
*
CONTROL WIRING
NOTE:
HEAT ANTICIPATOR
SHOULD BE SET AT 0.25
AMPS FOR ALL MODELS.
PROGRAMMABLE
THERMOSTAT ONLY
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCON-
NECT SWITCH, WIRING &
OVERCURRENT PROTECTION.
REFER TO ELECTRICAL DATA TA-
BLES TO SIZE THE DISCONNECT
SWITCH, WIRING & OVERCUR-
RENT PROTECTION.
