York YCWL Series - Differential Pressure Switch (Field Mounted); Power Supply Connections (Factory Mounted); Control Power Transformer (Factory Mounted); Power Connection and Distribution

JOHNSON CONTROLS
FORM 150.26-EG1 (116)
74
2.06 POWER CONNECTION AND DISTRIBUTION
A. Power Panels:
1. NEMA 1 (IP32), powder painted steel cabinets with hinged, latched, and gasket
sealed outer doors. Provide main power connection(s), control power connections,
compressor start contactors, current overloads, and factory wiring.
2. Power supply shall enter unit at a single location, be 3 phase of scheduled voltage,
and connect to individual terminal blocks per compressor. Separate disconnecting
means and/ or external branch circuit protection (by Contractor) required per ap-
plicable local or national codes.
B. Exposed compressor and control power wiring shall be routed through liquid tight con-
duit.
C. Power Supply Connection shall be:
1. Single Point Power Supply: Single point Terminal Block for eld connection and in-
terconnecting wiring to the compressors. Separate external protection must be sup-
plied, by others, in the incoming power wiring, which must comply with the National
Electric Code and/or local codes.
2.07 ACCESSORIES AND OPTIONS
Some accessories and options supersede standard product features. Your Johnson Con-
trols sales representative will be pleased to provide assistance.
A. Power Supply Connections (Factory Mounted):
1. Single Point Disconnect Switch: Single point Non-Fused Disconnect and lockable
external handle (in compliance with Article 440-14 of N.E.C.) can be supplied to
isolate the unit power voltage for servicing. Separate external fusing must be sup-
plied, by others, in the incoming power wiring, which must comply with the National
Electric Code and/or local codes.
2. Single Point Circuit Breaker: Single point Terminal Block with Circuit Breaker and
lockable external handle (in compliance with Article 440 14 of N.E.C.) can be sup-
plied to isolate power voltage for servicing. Incoming power wiring must comply with
the National Electric Code and/or local codes.
3. Multiple Point Circuit Breaker: Multiple point circuit breakers with lockable external
handles (in compliance with Article 440-14 of N.E.C.) can be supplied to isolate
power for servicing. Incoming power wiring must comply with the National Electric
Code and/or local codes.
B. Control Power Transformer (Factory Mounted): Converts unit power voltage to 120-
1-60 (500 VA capacity). Factory mounting includes primary and secondary wiring be-
tween the transformer and the control panel.
C. Flow Switch (Field-mounted): Vapor proof SPDT, NEMA 3R switch (150 PSIG), -20°F
to 250°F. Available with evaporator.
D. Differential Pressure Switch (Field mounted): Alternative to the paddle-type ow
switch. 3-45 PSIG (0.2-3 bar) range with ¼” NPTE pressure connections. Available
with evaporator.
Guide Specifications (Cont'd)