Figure 24: Control panel positioning
Control wiring
On units shipped disassembled, after installation of the control center, control wiring must be
completed between unit components and control center, solid state starter, or variable speed drive,
when used, using wiring harness furnished.
Field wiring connections for commonly encountered control modifications (by others) if required,
are shown on Field Control Modifications (Form 160.79-PW2).
Note: No deviations in unit wiring from that shown on drawings furnished must be made
without prior approval of the Johnson Controls representative.
Power wiring
Oil pump – three-phase starter
Separate wiring or a fused disconnect switch should be supplied by the installer and connected
to the variable speed oil pump panel. Do not make final power connections to the chiller until
approved by a Johnson Controls representative.
Note: Remote electromechanical starters for the chiller must be furnished in accordance with
the Remote Starter Specification (Form 160.79-PW4) 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 ensure correct 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.
Centrifugal Liquid Chillers42
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