7
Refer to the unit wiring diagram for electrical connections.
When installed, the unit must be electrically grounded in
accordance with local codes or in the absence 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 conductors.
CAUTION
To prevent improper and dangerous
operation 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 weath-
erproof fittings. All exterior power supply and ground wiring
must be in approved weatherproof conduit. 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, televi-
sion, etc. Consult the Instruction Sheet packaged with
thermostat for mounting instructions.
All units have one stage of heating and one stage of me-
chanical 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 electrical
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
60
Figure 4
Low Voltage Control Board