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PRODUCT DESCRIPTION
2.1 Introduction
YORK YCSE/YCRE R407C chillers are designed for
water or water-glycol cooling. It is designed for indoor
installation in a plant room. Units are available with one
or two independent refrigerant circuits with a single
evaporator and, on YCSE models, a single condenser.
Units are completely factory assembled with all
interconnecting refrigerant piping and wiring ready for
field installation. The units are pressure tested,
evacuated, and fully factory charged with refrigerant
R407C and oil in each of the independent refrigerant
circuits. After assembly, an operational test is
performed with water flowing through the evaporator
and condenser (YCSE) to ensure that each refrigerant
circuit operates correctly.
2.2 Compressor
The unit has suction cooled, semi-hermetic screw
compressors. The compressors incorporate twin-screw
rotors and solenoid valves for continuous capacity
control. The compressors are equipped with a built-in oil
separator, an oil sight glass, a crankcase oil heater and
a suction filter. The compressors have a 2-pole motor
with over current and thermostat protection. Start / Delta
starting is provided as standard. All compressors are
mounted on isolator pads to reduce transmission of
vibration to the rest of the unit.
Capacity Control
For YCSE/YCRE units, the compressors will start at the
minimum load position and provide a capacity control
range from 15% to 100 % per compressor using a
continuous function slide valve.
2.3 Refrigerant Circuits
Depending on model size, one or two independent
refrigerant circuits are provided on each unit. Each
circuit uses copper refrigerant pipe formed on computer
controlled bending machines to reduce the number of
brazed joints resulting in a reliable and leak resistant
system.
Liquid line components include a service valve, a high
absorption filter dryer, a sight glass with moisture
indicator and an electronic expansion valve.
Suction line components include an optional service
and isolation valve.
Discharge line components include a check valve, an
optional service and isolation valve and a pressure relief
valve.
2.4 Evaporator
The evaporator is a stainless steel brazed type plate
heat exchanger. The waterside design working
pressure is 10 barg. The refrigerant side design working
pressure is 18 bar g. The cooler is thermally insulated
with flexible closed cell foam. Water connection to the
evaporator is via victaulic-grooved connections. Flange
connections are available as an option.
2.5 Condenser (YCSE Only)
The condenser is a stainless steel brazed type plate
heat exchanger. The waterside design working
pressure is 10 barg. The refrigerant side design working
pressure is 30 bar g. Water connection to the condenser
is via victaulic-grooved connections. Flange
connections are available as an option.
2-1
035-21786-100 Rev. 1 (0909)
1 Compressor
2 Evaporator
3 Condenser (YCSE only)
4 Power Section
5 Control Panel
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