127408-YIM-B-0606
16
Unitary Products Group
THERMOSTAT WIRING
The thermostat should be located on an inside wall approxi-
mately 56 inches (1422 mm) above the floor where it will not
be subject to drafts, sun exposure or heat from electrical fix-
tures or appliances. Follow the manufacturer's instructions
enclosed with thermostat for general installation procedure.
Seven (7) color-coded, insulated wires should be used to
connect the thermostat to the unit. Refer to Table 9 for control
wire sizing and maximum length.
POWER AND CONTROL WIRING
Field wiring to the unit, fuses, and disconnects must conform
to provisions of National Electrical Code (NEC), ANSI/NFPA
No. 70 – Latest Edition (in U.S.A.), current Canadian Electri-
cal Code C221, and/or local ordinances. The unit must be
electrically grounded in accordance with NEC and CEC as
specified above and/or local codes.
Voltage tolerances which must be maintained at the com-
pressor terminals during starting and running conditions are
indicated on the unit Rating Plate and Table 1.
The internal wiring harnesses furnished with this unit are an
integral part of the design certified unit. Field alteration to
comply with electrical codes should not be required. If any of
the wire supplied with the unit must be replaced, replacement
wire must be of the type shown on the wiring diagram and the
same minimum gauge as the replaced wire.
A disconnect must be utilized for these units. When installing
a disconnect, refer to Figure 4 for the recommended mount-
ing location.
NOTE:
Since not all local codes allow the mounting of a dis-
connect on the unit, please confirm compliance with
local code before mounting a disconnect on the unit.
Electrical line must be sized properly to carry the load. USE
COPPER CONDUCTORS ONLY. Each unit must be wired
with a separate branch circuit fed directly from the meter
panel and properly fused.
Refer to Figures 17, 18 and 19 for typical field wiring and to
the appropriate unit wiring diagram mounted inside control
doors for control circuit and power wiring information.
POWER WIRING DETAIL
Units are factory wired for the voltage shown on the unit
nameplate. Refer to Electrical Data Tables 10 through 12 size
power wiring, fuses, and disconnect switch.
Power wiring is brought into the unit through the side of the
unit or the basepan inside the curb.
TABLE 9: CONTROL WIRE SIZES
Wire Size
Maximum Length
18 AWG
150 Feet (45.72 meters)
Avoid damage to internal components if drilling
holes for disconnect mounting.
When connecting electrical power and control wiring
to the unit, water-proof connectors must be used so
that water or moisture cannot be drawn into the unit
during normal operation. The above water-proofing
conditions will also apply when installing a field sup-
plied disconnect switch.
