Accessories And Options - York MILLENNIUM YCAS Installation Operation & Maintenance

Set Points – For setting chilled liquid temperature, chilled
liquid range, remote reset temperature range.
Clock – Used to set time, daily or holiday start/stop
schedule and manual override for servicing.
Print – Used to display or print operating data or sys-
tem fault shutdown history for last six faults. (4 in YCAS
3-compressor and YCAS 4-compressor Models). Print-
outs through an RS-232 port via a separate printer.
Program
For setting low leaving liquid temperature cutout, 300 to
600 second anti-recycle timer, average motor current
unload point, liquid temperature set-point reset signal
from YORK ISN or building automation system.
Additional functions (password protected) for program-
ming by a qualified service technician:
Cutouts for low and high ambient, low suction pressure
and high discharge pressure, refrigerant type, high dis-
charge pressure unload setpoint.

ACCESSORIES AND OPTIONS

Multiple Point Power Connection (Standard)
Standard field power wiring connection on all models is
Multiple Point Power Connection. Field provided power
supply circuits, with appropriate branch circuit protec-
tion, are connected to factory provided terminal blocks,
non-fused disconnect switches or circuit breakers with
lockable external handles located in the two power com-
partments.
Single Point Power Connection with Individual
Circuit Protection
A single point supply circuit with field provided protec-
tion is connected to a factory provided terminal block or
non-fused disconnect switch located in the options com-
partment. Factory wiring is provided from the terminal
block or disconnect switch to factory supplied internal
branch circuit breakers with lockable external handles
in the power compartments.
Single Point Power Connection with Combined
Circuit Protection
A single point supply circuit with field provided protec-
tion is connected to a factory provided circuit breaker
with lockable external handle located in the options com-
partment. Factory wiring is provided from the circuit
breaker to factory supplied terminal blocks in the power
compartments.
YORK INTERNATIONAL
Single-Point Power Connection without
Circuit Protection
A single point supply circuit with field provided protec-
tion is connected to a factory provided terminal block or
non-fused disconnect switch located in the options com-
partment. Factory wiring is provided from the terminal
block or disconnect switch to factory supplied terminal
blocks in the power compartments.
Control Circuit Terminal Block
A 120V, 20A control circuit power terminal strip located
in the control panel to accept a field provided control
power supply, rather than the standard factory mounted
control circuit transformer. The supply with appropriate
branch circuit protection in accordance with applicable
Local codes, provides the unit control circuit power sup-
ply via the panel mounted Emergency Stop Switch.
Building Automation System (BAS) Interface
Provides a means to reset the leaving chilled liquid tem-
perature or percent full load amps (current limiting) from
the BAS (Factory Mounted).
Printed circuit board to accept 4 to 20 mA, 0 to 10 VDC,
or dry contact closure input from the BAS.
A YORK ISN Building Automation System can pro-
vide a Pulse Width Modulated (PWM) signal direct to
the standard control panel via the standard on-board
RS485 port.
Condenser Coil Protection
The standard condenser coils have aluminium fins, cop-
per tubes, and galvanized steel supports for generally
adequate corrosion resistance. However, these materi-
als are not adequate for all environments.
The following options provide added protection:
• Black Fin condenser coils - Condenser coils con-
structed using black epoxy coated aluminium fin stock
for corrosion resistance comparable to copper fin coils
in typical seashore locations.
• Copper Fin condenser coils – Coils constructed
with corrosion resistant copper fins. Not recommended
in areas where units may be exposed to acid rain.
• Phenolic Coated condenser coils – Completed con-
denser coil assemblies are covered with a cured Phe-
nolic coating. Probably the most suitable selection for
seashore locations where salt spray may come into con-
tact with the fins, and other corrosive applications ex-
cept: strong alkalis, oxidizers, and wet bromine, chlorine,
and fluorine in concentrations greater than 100 PPM.
FORM 201.18-NM2
2
25