York YLUA Series Operation Manual page 49

2.06 POWER CONNECTION AND DISTRIBUTION
A. Power Panels:
1. NEMA 3R raintight, powder painted steel cabi-
nets with hinged, latched, and gasketed outer
doors. Provide main power connection(s), control
power connections, compressor and fan motor
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 applicable local or national codes.
B. Exposed compressor, control and fan motor power
wiring shall be routed through liquid tight conduit.
2.07 ACCESSORIES AND OPTIONS
Some accessories and options supercede standard prod-
uct features. Your YORK representative will be pleased
to provide assistance.
A. Microprocessor controlled, Factory installed Across-
the-Line type compressor motor starters as standard.
B. Outdoor Ambient Temperature Control
1. Low Ambient Control: Permits unit operation to
0°F (-18°C) ambient. Standard unit controls to
32°F (0°C) ambient.
C. Power Supply Connections:
1. Single Point Power Supply: Single point Terminal
Block for field connection and interconnecting
wiring to the compressors. Separate external
protection must be supplied, by others, in the
incoming power wiring, which must comply with
the National Electric Code and/or local codes.
2. S i n g l e P o i n t : S i n g l e p o i n t N o n - F u s e d
Disconnect(s) 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 in coming power wiring,
which must comply with the National Electric
Code and/or local codes.
3. Single Point Disconnect with Individual System
Breakers: Single point Terminal Block with Non-
Fused Disconnect and lockable external handle
(in compliance with Article 440-14 of N.E.C.) can
be supplied to isolate power voltage for servicing.
Factory interconnecting wiring from disconnect
to factory supplied circuit breakers.
JOHNSON CONTROLS
4. Single Point Circuit Breaker: Single point Ter-
minal Block with Circuit Breaker and lockable
external handle (in compliance with Article 44014
of N.E.C.) can be supplied to isolate power volt-
age for servicing. Incoming power wiring must
comply with the National Electric Code and/or
local codes.
D. Pressure & Temperature Transducers and Sensors
1. Discharge Pressure Transducers: Permits unit
to sense and display discharge pressure.
2. Suction Pressure Transducers: Permits unit to
sense and display suction pressure.
3. Suction Temperature Sensors: Permits units to
sense and display suction temperature.
E. Control Power Transformer: Converts unit power volt-
age to 120-1-60 (500 VA capacity). Factory mounting
includes primary- and secondary-wiring between the
transformer and the control panel.
F. Motor Current Module: Capable of monitoring com-
pressor motor current. Provides extra protection
against compressor reverse rotation, phase-loss and
phase imbalance. Options consists of one module
per electrical system. (Factory mounted)
G. Power Factor Correction Capacitors: Provided to cor-
rect unit compressor factors to a 0.900.95.
H. Condenser Coil Environmental Protection:
1. Pre-Coated: Epoxy coated aluminum fin stock to
guard from corrosive agents and insulate against
galvanic potential. For mild seashore or industrial
locations
2. Copper Fin: Provide copper fins in lieu of alumi-
num.
3. Post-Coated Dipped: Dipped-cured coating on
condenser coils for seashore and other corrosive
applications (with the exception of strong alkalis,
oxidizers, and wet bromine, chlorine and fluorine
in concentrations greater than 100ppm).
I. Protective Condensing Unit Panels (Factory or Field
Mounted):
1. Louvered Panels (condenser coils only): Painted
steel as per remainder of unit cabinet, over ex-
ternal condenser coil faces.
2. Wire Panels (full unit): Heavy gauge, welded
wire-mesh, coated to resist corrosion, to protect
condenser coils from incidental damage and
restrict unauthorized access to internal compo-
nents.
3. Louvered Panels (full unit): Painted steel as per
remainder of unit cabinet, to protect condenser
FORM 150.63-EG4 (1012)
49