8
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 dam-
age due to fire, use only copper conduc-
tors.
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.
The best protection for the wiring is the lowest rated
fuse or circuit breaker which will supply power to the
unit during normal operation without nuisance trips.
Such a device will provide maximum circuit protection.
DO NOT EXCEED THE MAXIMUM OVERCURRENT
DEVICE SIZE SHOWN ON UNIT DATA PLATE.
All line voltage connections must be made through
weatherproof fittings. All exterior power supply and
ground wiring must be in approved weatherproof con-
duit. Low voltage wiring from the unit control panel to
the thermostat requires coded cable. For ground level
and rooftop wiring refer to Figure 5.
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 6 for proper
thermostat wiring.
3
DI
UNUSED
NEUTRAL
C
X
XFMR
SEC
MOTOR
LEADS
1
2
S
S
C
OOL
HE
AT
S
CIR BLOWER
F1
HEAT FAN
DELAY
OFF
120
15
0
06
C
C
G
Y
W
R
Y
Low Voltage Terminal Board
Figure 4
Low Voltage Control Board