4
IV. Duct Connections
Horizontal Airflow Installations
Two three inch collar connections are shipped in the
return air openings on the side of the unit. Remove the
two collars, reverse and snap back into place in the
outlet and inlet openings. Be sure the flanges are to the
outside of the unit. Secure with screws provided.
V. Electrical Wiring
Locating The Thermostat
Thermostat should be mounted 5 feet above the floor,
on a vibration free inside wall in a room or a hallway that
has good air circulation.
Movement of air should not be obstructed by furniture,
door, draperies, etc. The thermostat should not be
mounted where it will be affected by drafts, hot or cold
water pipes or air ducts in walls, radiant heat from
fireplace, lamps, the sun, television, etc. Consult the
Instruction Sheet packaged with thermostat for mount-
ing instructions.
All units have one stage of heating and one stage of
mechanical cooling. Units which will have economizers
may use thermostats with one or two stages of cooling.
WARNING
To avoid death or personal injury due to
electrical shock, disconnect the electri-
cal power before electrically connecting
the unit.
The units are designed for operation on 60 hertz current
and at voltages as shown on the rating plate. All internal
wiring in the unit is complete. It is necessary to bring in
the power supply to the contactor as shown on the unit
wiring diagram which is supplied with each unit. 24 volt
wiring must be connected between the unit control panel
and the room thermostat. Refer to Figure 4 for location
of low voltage terminal board and Figure 5 for proper
thermostat wiring.
60 TEST
30
90
DEFROST
VAL
COMMON
Y OUT
PS2
PS1
P
S
1
A
A
B
B
DF
0
OUT
FAN
Fuse
G
C
R
W
O
Y
R
Low
Voltage
Terminal
Board
Connectors
Figure 4
Low Voltage Control Board
Refer to the unit wiring diagram for electrical connec-
tions. When installed, the unit must be electrically
grounded in accordance with local codes or in the ab-
sence of local codes, with the National Electrical Code,
ANSI/NFPA No. 70, and/or the CSA C22.1 Electrical
Code, if an external source is utilized.
WARNING
To avoid death or personal injury due to
electrical shock, wiring to the unit must
be properly grounded.
CAUTION
To avoid personal injury or property
damage due to fire, use only copper con-
ductors.
CAUTION
To prevent improper and dangerous op-
eration due to wiring errors, label all wires
prior to disconnection when servicing
controls. Verify proper operation after
servicing.
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