York YCAL0041 - Manual (Page 76)

YORK INTERNATIONAL 76
liquid temperature cutout, low suction pressure
cutout, high discharge pressure cutout, anti-re-
cycle timer (compressor start cycle time), and
anti-coincident timer (delay compressor
starts).
6. Display Data: Return and leaving liquid tem-
peratures, low leaving liquid temperature cut-
out setting, low ambient temperature cutout set-
ting, outdoor air temperature, English or metric
data, suction pressure cutout setting, each
system suction pressure,discharge pres-
sure (standard on YCAL0041-0065 models),
liquid temperature reset via a YORK ISN DDC
or Building Automation System (by others) via
PWM input as standard or a 4-20milliamp or 0-
10 VDC input or contact closure with optional
BAS interface, anti-recycle timer status for each
compressor, anti-coincident system start timer
condition, compressor run status, no cooling
load condition, day, date and time, daily start/
stop times, holiday status, automatic or manual
system lead/lag control, lead system definition,
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 POWER CONNECTION AND DISTRI-
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. .
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. Standard unit controls to 25°F
ambient. Low Ambient Control standard on
YCAL0041-0065 models
2. Single Point Power Supply with individual Sys-
tem Breakers: Single or Terminal Block(s) for
field connection and factory interconnecting
wiring to factory supplied system breakers .
Available on YCAL0090-0134 models.
3. Single Point or Disconnect: Single or Dual point
Non-Fused Disconnect(s) and lockable exter-
nal handle (in compliance with Article 440-14