York YCAL0041 User Manual download pdf (Page 76)

YORK INTERNATIONAL

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 CONNE CTION AND DIST RI-

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

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York YCAL0041 User Manual Page 76

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