035-17311-000 REV A (1200))
Unitary Products Group
15
POWER AND CONTROL WIRING
Field wiring to the unit, fuses, and disconnects must conform
to provisions of National Electrical Code (NEC), ANSI/NFPA
70 – Latest Edition, and/or local ordinances. The unit must
be electrically grounded in accordance with NEC ANSI/NFPA
– Latest Edition and/or local codes. In Canada, the unit must
conform to CSA C22.1.
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 5.
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. Factory
installed disconnects are available. If installing a disconnect
(field supplied or York International
supplied accessory),
refer to Figure 4 for the recommended mounting 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 16, 17 and 18 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 Table 12 to 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.
Avoid damage to internal components if drilling
holes for disconnect mounting.
When connecting electrical power and control wir-
ing 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 supplied disconnect switch.
FIGURE 16 : ELECTRONIC THERMOSTAT FIELD
WIRING
