20 YORK INTERNATIONAL
FORM 201.18-NM1 (102)
Single-Point Power Connection with Combined
Circuit Protection
A single-point supply circuit with field-provided pro-
tection is connected to a factory-provided circuit breaker
with lockable external handle located in the options
compartment. Factory wiring is provided from the cir-
cuit breaker to factory-supplied terminal blocks in the
power compartments.
Single-Point Power Connection without Circuit
Protection
A single-point supply circuit with field-provided pro-
tection is connected to a factory-provided terminal block
or non-fused disconnect switch located in the options
compartment. Factory wiring is provided from the ter-
minal 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 lo-
cated 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 cir-
cuit power supply 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 20mA, 0 to 10VDC,
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 aluminum fins, cop-
per tubes, and galvanized steel supports for generally
adequate corrosion resistance. However, these materi-
als are not adequate for all environments.
Entry – Used to confirm Setpoint changes, cancel in-
puts, advance day, and change AM/PM.
Setpoints – 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. Printouts
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 setpoint
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 pres-
sure and high discharge pressure, refrigerant type, high
discharge 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
protection, are connected to factory-provided terminal
blocks, non-fused disconnect switches or circuit break-
ers with lockable external handles located in the two
power compartments.
Single-Point Power Connection with Individual
Circuit Protection
A single-point supply circuit with field-provided pro-
tection is connected to a factory-provided terminal block
or non-fused disconnect switch located in the options
compartment. Factory wiring is provided from the ter-
minal block or disconnect switch to factory-supplied
internal branch circuit breakers with lockable external
handles in the power compartments.
Product Description
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