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FORM 150.75-NM2
19
YORK INTERNATIONAL
ELECTRICAL WIRING
Liquid Chillers are shipped with all factory mounted con-
trols wired for operation.
Field Wiring – Power wiring (Fig. 14) must be provided
through fused disconnect switches to the unit terminals
(or optional molded case disconnect switches) in accor-
dance with N.E.C. or local code requirements. Minimum
circuit ampacity and maximum dual element fuse size
are given on pages 10 and 11. A 115-1-60/50, 20 amp
source must be supplied for each Control Panel through
a fused disconnect when Control Panel Transformers
(optional) are not provided. Refer to WIRING DIAGRAM.
Affiliated apparatus, such as a chilled water flow
switches, auxiliary contacts from the chilled water pump
starter, alarms, etc. should be interlocked into the con-
trol panel circuits. These field modification may be made
as shown on the WIRING DIAGRAM.
If the Dual Point Wiring Option (Fig. 14) is installed, tow
power feeds are required. A single feed to the Master
Module and a single feed to the Slave Module. This
differs from the standard chiller where four feeds are
required. Two feeds are also required if Power Discon-
nect Switch Options are installed.
MULTIPLE UNITS
For increased compressor protection and to reduce
power inrush at start-up on multiple chiller installations,
provisions must be made to prevent simultaneous start-
up of two or more units. Also, some method must be
employed to automatically cycle one or more of the units
on or off to permit more efficient operation at part load
conditions. A sequencing kit may be acquired through
your local YORK representative.
STANDARD POWER SUPPLY WIRING
OPTIONAL DUAL POINT POWER WIRING
LD01924
LD01925
NOTE:
Single point remote mounted wiring panel recommendations or components can be provided as a special. Consult your YORK represen-
tative for details.
FIG. 14 – FIELD POWER WIRING