JOHNSON CONTROLS
101
FORM 150.62-EG1 (507)
compressor starts/operating hours (each), sta-
tus of hot gas valves, evaporator heater and
fan operation, run permissive status, number
of compressors running, liquid solenoid valve
status, load & unload timer status, water pump
status.
7. System Safeties: Shall cause individual com
pressor systems to perform auto shut down;
manual reset required after the third trip in 90
minutes. Includes: high discharge pressure, low
suction pressure, high pressure switch, and
motor protector. Compressor motor protector
shall protect against damage due to high input
current or thermal overload of windings.
8. Unit Safeties: Shall be automatic reset and
cause compressors to shut down if low ambi-
ent, low leaving chilled liquid temperature, un-
der voltage, and flow switch operation. Contrac-
tor shall provide flow switch and wiring per chiller
manufacturer requirements.
9. Alarm Contacts: Low ambient, low leaving
chilled liquid temperature, low voltage, low
battery, and (per compressor circuit): high dis-
charge pressure, and low suction pressure.
D. Manufacturer shall provide any controls not listed
above, necessary for automatic chiller operation.
Mechanical Contractor shall provide field control
wiring necessary to interface sensors to the chiller
control system.
2.06
P O W E R C O N N E C T I O N A N D D I S T R I -
BUTION
A. Power Panels:
1. NEMA 3R/12 (IP55) rain/dust tight, powder
painted steel cabinets with hinged, latched, and
gasket sealed outer doors. Provide main power
connection(s), control power connections, com-
pressor and fan motor start contactors, current
overloads, and factory wiring.
2. Power supply shall enter unit at a single loca-
tion, be 3 phase of scheduled voltage, and
connect to individual terminal blocks per com-
pressor. Separate disconnecting means and/
or external branch circuit protection (by Con-
tractor) 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
product features. Your YORK representative will be
pleased to provide assistance.
A. Microprocessor controlled, Factory installed Across-
the-Line type compressor motor starters as stan-
dard.
B. Outdoor Ambient Temperature Control
1. Low Ambient Control: Permits unit operation to
0°F ambient. Standard unit controls to 25°F
ambient. Low Ambient Control standard on
YCAL0090-0134 models.
2. High Ambient Control: Permits unit operation
above 115°F ambient.
C. Power Supply Connections:
1. Single Point Power Supply: Single point Termi-
nal Block for field connection and interconnect-
ing wiring to the compressors. Separate exter-
nal protection must be supplied, by others, in
the incoming power wiring, which must comply
with the National Electric Code and/or local
codes. Single Point Supply option avail a b l e
on YCAL0040-0080 models and standard on
YCAL0014 - 0034 models.
2. Single Point or Multiple Point Power Supply with
individual System Breakers: Single or Multiple
Point Terminal Block(s) for field connection and
factory interconnecting wiring to factory supplied
system breakers . Available on YCAL0090-0134
models.
3. Single Point or Multiple Point Disconnect:
Single or Dual point Non-Fused 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 supplied, by
others, in the in coming power wiring, which
must comply with the National Electric Code
and/or local codes.
4. 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.
Available on YCAL0090-0134 models.
5. Single Point Circuit Breaker: Single point Ter-
minal Block with Circuit Breaker and lockable
external handle (in compliance with Article 440
14 of N.E.C.) can be supplied to isolate power