FORM 201.25-NM1 (302)
9
YORK INTERNATIONAL
INTRODUCTION
YORK YCRS chillers are designed for water or wa-
ter-glycol cooling.
All models are designed for indoor installation. The units
are completely assembled with all interconnecting re-
frigerant piping and internal wiring, ready for field in-
stallation.
The unit consists of 2 screw compressors in a correspond-
ing number of separate refrigerant circuits, a shell and
tube DX evaporator, and oil separators for each circuit.
Before delivery, the unit is pressure tested, evacuated,
and fully charged with refrigerant and oil in each of the
independent refrigerant circuits. After assembly, an
operational test is performed with water flowing through
the cooler to ensure that each refrigerant circuit oper-
ates correctly.
The unit is shipped with a nitrogen holding charge. Re-
frigerant (R-22) must be added on site.
The unit framework is fabricated using heavy-gauge
galvanized steel which is zinc phosphate pre-treated and
powder coated to minimize corrosion.
Compressor
Twin helical semi-hermetic screw compressors, are
provided to ensure high operational efficiencies and re-
liable performance. Capacity control is achieved through
a single slide valve. The compressor is a positive dis-
placement type characterized by two helically grooved
rotors which are manufactured from forged steel. The
60 Hz motor operates at 3600 rpm to direct drive the
male rotor which in turn drives the female rotor on a
light film of oil.
Each compressor is direct drive, semi-hermetic, rotary
twin screw type and includes the following items:
Two screw rotors, with asymmetric profiles, manufac-
tured from forged steel.
A cast iron compressor housing precision machined to
provide optimal clearance for the rotors.
An internal discharge check valve to prevent rotor back-
spin during shutdown.
An acoustically tuned, internal discharge muffler to
minimize noise, while optimizing flow for maximum
performance.
Discharge and suction shut-off service valves.
A reliable suction gas cooled high efficiency, accessible
hermetic motor with redundant overload protection using
both thermistor and current overload protection.
A suction gas screen and serviceable, 0.5 micron full
flow oil filter within the compressor housing.
Refrigerant gas is injected into the void created by the
unmeshing of the five lobed male and seven lobed fe-
male rotor. Further meshing of the rotors closes the rotor
threads to the suction port and progressively compresses
the gas in an axial direction to the discharge port. The
SECTION 2
PRODUCT DESCRIPTION
1 COMPRESSOR
2 COOLER
3 POWER SECTION - SYSTEM 1
4 COMMON INPUT SECTION
5 POWER SECTION - SYSTEM 2
6 CONTROL PANEL
FIG. 1 –
YCRS WATER COOLED LIQUID CHILLER
2
2
1
6
5
4
3
00635VIP
00635VIP
