Power And Control Wiring - York ZR Series Installation Manual

coils or safety shutdown. See the physical data tables for the
number and size of filters needed for the unit.
Do not operate the unit without filters properly installed.
Make sure that panel latches are properly positioned on
the unit to maintain an airtight seal.

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 Electrical
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 must be maintained at the compressor
terminals during starting and running conditions. The voltage
tolerances are indicated on the unit rating plate and in Table 2.
208/230-3-60 and 380/415-3-50 units control
transformers are factory wired for 230v and 415v power
supply respectively. Change the tap on the transformer
for 208-3-60 or 380-3-50 operation. See the unit wiring
diagram.
The internal wiring harnesses furnished with this unit are an
integral part of the design certified unit. Field alteration to
comply with electrical codes is not 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.
Johnson Controls Ducted Systems
A disconnect must be utilized for these units. Factory-installed
disconnects are available.
Avoid damage to internal components if you drill holes to
install a disconnect.
Note: Not all local codes allow the installation of a disconnect
on the unit. Confirm compliance with local code before
you install a disconnect on the unit.
Electrical line must be sized properly to carry the load.
Note: Use copper conductors only.
Each unit must be wired with a separate branch circuit fed
directly from the meter panel and properly fused.
See Figures 22, 23, and 24 for typical field wiring. Refer to the
appropriate unit wiring diagram mounted inside the control
doors for control circuit and power wiring information.
When you connect electrical power and control wiring to
the unit, you must use water-proof connectors so that
water or moisture cannot be drawn into the unit during
normal operation. These water-proofing conditions also
apply when you install a field-supplied disconnect
switch.
Power wiring detail
Units are factory wired for the voltage shown on the unit
nameplate. See Table 10, Electrical data, on page 20 to size
power wiring, fuses, and the disconnect switch.
Power wiring is brought into the unit through the side of the unit
or the basepan inside the curb.
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