Power wiring
Chiller with electromechanical starter
A 115 volt, single phase, 60 or 50 Hertz power supply of 20 amperes must be furnished to the
control center, from the control transformer (2 KVA required) included with the compressor
motor starter. Do not make final power connections to control center until approved by a Johnson
Controls representative.
Oil pump - three-phase starter
Separate wiring or a fused disconnect switch should be supplied by the installer.
Note:
Remote electromechanical starters for the chiller must be furnished in accordance with
YORK Starter Specifications Product Drawing Form 160.73-PA1
to provide the features necessary
for the starter to function properly with the YORK control system.
Each chiller unit is furnished for a specific electrical power supply as stamped on the unit data plate,
which also details the motor connection diagrams.
Note:
To insure proper motor rotation the starter power input and starter to motor
connections must be checked with a phase sequence indicator in the presence of the Johnson
Controls representative.
CAUTION
Do not cut wires to final length or make final connections to motor terminals or starter power input
terminals until approved by the Johnson Controls representative.
YK motors with electromechanical starter
Motor leads are furnished with a crimp type connection having a clearance hole for a 3/8 in. (9.5
mm) bolt, motor terminal lugs are not furnished. Refer to wiring labels in motor terminal box for
hook-up to suit motor voltage and amperage for power wiring connections.
Chiller with solid state starter or variable speed drive
A chiller equipped with a factory mounted solid state starter or variable speed drive does not
require wiring to the compressor motor. The motor power wiring is factory connected to the solid
state starter or variable speed drive. Refer to
Field Wiring Diagram
. All wiring to the control panel
and the oil pump starter is completed by the factory. A control transformer is furnished with the
solid state starter or variable speed drive.
Note:
Only copper conductors should be connected to compressor motors and starters. Do
not use aluminum to connected to copper lugs. Aluminum oxide and the difference in thermal
conductivity between copper and aluminum cannot guarantee the required tight connection
over a long period of time.
Model YK (Style G) Centrifugal Liquid Chiller
28
Summary of Contents for YORK YK Series
Page 2: ...2 Model YK Style G Centrifugal Liquid Chiller...
Page 14: ...Figure 3 Long term storage tube side Model YK Style G Centrifugal Liquid Chiller 14...
Page 19: ...Figure 6 Neoprene isolators in mm 19 Model YK Style G Centrifugal Liquid Chiller...
Page 20: ...Figure 7 Spring isolators in mm Model YK Style G Centrifugal Liquid Chiller 20...
Page 21: ...Figure 8 Spring isolators continued in mm 21 Model YK Style G Centrifugal Liquid Chiller...
