
YORK INTERNATIONAL
FORM 201.18-EG1
5
REFRIGERANT CIRCUIT
•Independent refrigerant circuits per compressor,
each using copper refrigerant pipe formed on com-
putercontrolled bending machines. This eliminates
over 60% of system piping brazed joints as com-
paredto designs thatuse fittings,resultingin ahighly
reliable and leak resistant system.
•Liquid line components include: manual shut-off
valvewith charging port,high adsorption removable
corefilter-drier, solenoidvalve,sight glasswith mois-
ture-indicator, and reliable thermostatic expansion
valves.
•Economizer is a refrigerant to refrigerant, compact
plate-type heat exchanger to maximize chiller ca-
pacityand efficiencyby subcooling liquid refrigerant
deliveredtothe cooler expansionvalve. Constructed
of corrosion resistant stainless steel plates formed
to induce turbulent flow and enhance heat transfer,
then oven brazed and pressure tested for reliability.
Designedandconstructed inaccordancewith ASME
and TÜV for 450 PSIG (31 bar). U.L./CSA listed.
•Suction and discharge lines provided with manual
compressor shutoff service valves. Suction line
equipped with closed-cell insulation.
•Oilseparators with DesignWorkingPressure of450
PSIG (31 bar) and U.L. listing are high efficiency,
augmented aerosol impingement type to maximize
oilextraction withoutfragile mediato breakdown.An
oil charging valve is included with each refrigerant
circuit.
•Oil cooling provided by dedicated air cooled finned
tube type heat exchanger located in the condenser
section of the machine.
MICROPROCESSOR CONTROLS
•Controls housed in a powder painted steel cabinet
enclosure, equivalent to NEMA 3R/12 (IP55), with
hinged, latched, and gasket sealed, door.
•Liquidcrystal 40character displaywith textprovided
on two lines and light emitting diode backlighting for
outdoorviewing.
•Colorcoded, 32button, sealedkeypad withsections
for Display, Entry, Setpoints, Clock, Print, Program
and Unit On/Off.
•Standard controls include: brine chilling or thermal
storage, automaticpump down,run signalcontacts,
demand load limit from external building automa-
tion system input, remote liquid temperature reset
input,unit alarm contacts, evaporator pump control,
automatic reset after power failure, automatic sys-
temoptimization tomatch operatingconditions, soft-
ware stored in non-volatile memory (EPROM) to
eliminate chiller failure due to AC power failure.
Programmed setpoints retained in lithium battery
backed RTC memory for a minimum 5 years.
•Display –In English (°F and PSIG) or Metric (°C
and Bars) units, and for each circuit:
♦Returnandleaving chilledliquid, and ambienttem-
perature.
♦Day, date and time. Daily start/stop times. Holi-
day and Manual Override status.
♦Compressor operating hours and starts. Auto-
maticor manual lead/lag. Lead compressoriden-
tification.
♦Run permissive status. No cooling load condi-
tion. Compressor run status.
♦Anti-recycle timer and anti-coincident start timer
status per compressor.
♦Suction (and suction superheat), discharge, and
oil pressures and temperatures per System.
♦Percent full load compressor motor current per
phase and average per phase. Compressor ca-
pacity control valve input steps.
♦Cutoutstatus and set-points for: supplyfluid tem-
perature, low suction pressure, high discharge
pressure and temperature, high oil temperature,
low and high ambient, phase rotation safety, and
low leaving liquid temperature.
♦Unloadinglimit set-points forhigh discharge pres-
sure and compressor motor current.
♦Liquid pull-down rate sensitivity (0.5°F to 5°F/
minute in 0.1°F increments).
♦Statusof: evaporatorheater, condenserfans, load
and unload timers, chilled water pump.
♦“Out of range”message.
♦Up to 6 fault shut down conditions.
♦Standard Display Language is English, with
Op-
tions
for: French, German, Italian, and Spanish.
•Entry –Enter set point changes, cancel inputs, ad-
vance day, change AM/PM.
•Setpoints –Chilled liquid temperature, chilled liq-
uid range, remote reset temperature range.
•Clock –Time, daily or holiday start/stop schedule,
manual override for servicing.
•Print –Operatingdata orsystem faultshutdown his-
tory for last six faults, and software version. Print-
outs through an RS-232 port via a separate printer
(by others).
•Program –
♦Low leaving liquid temperature cutout, 300 to 600
second anti-recycle timer, lag compressor start
time delay, and average motor current unload
point. Liquid temperature setpoint reset signal
from YORK ISN or building automation system
(by others) via: