York YCAS0130 - Manual (Page 12)

12 YORK INTERNATIONAL
FORM 201.19-NM1 (204)
INTRODUCTION
YORK YCAS chillers are designed for water or wa-
ter-glycol cooling. All units are designed to be lo cat ed
outside on the roof of a building or at ground level.
The units are completely assembled with all in ter con -
nect ing refrigerant piping and internal wiring, ready for
fi eld installation.
Prior to delivery, the unit is pressure tested, evacuated,
and fully charged with refrigerant and oil in each of the
two independent refrigerant circuits. After assembly,
an operational test is performed with water fl owing
through the evaporator to ensure that each refrigerant
cir cuit operates correctly.
The unit structure is manufactured from heavy gauge,
galvanized steel. All external structural parts are coat ed
with “Desert Sand” baked-on enamel powder paint. This
provides a fi nish which, when subjected to ASTM B117,
500 hour, 5% salt spray conditions, shows breakdown
of less than 1/8" either side of a scribed line (equiv a lent
to ASTM D1654 rating of “6”).
All exposed power wiring is be routed through liquid-
tight, non-metallic conduit.
General Description
The Air Cooled Screw Chiller utilizes many com po nents
which are the same or nearly the same as a stan dard
reciprocating chiller of a similar size. This in cludes
mod u lar frame rails, condenser, fans and evap o ra tor.
The chiller consists of 2 screw compressors in a cor re -
spond ing number of separate refrigerant circuits, a sin gle
shell and tube DX counterfl ow evaporator, econ o miz ers,
an air cooled condenser, and expansion valves.
Compressor
The semi-hermetic rotary twin-screw compressor is
designed for industrial refrigeration applications and
ensures high operational effi ciencies and reliable per-
for mance. Capacity control is achieved through a sin gle
slide valve. The compressor is a positive dis place ment
type characterized by two helically grooved rotors which
are manufactured from forged steel. The 60 Hz motor op-
erates at 3550 RPM to direct drive the male rotor which
in turn drives the female rotor on a light fi lm of oil.
PRODUCT DESCRIPTION
FIG. 1 – COMPONENT LOCATIONS
1 System Fans
2 System 1 Power Panel
3 System 2 Power Panel
4 Control Panel
5 Power Entry
6 System 1 Compressor
7 Evaporator
8 System 2 Compressor
9 System 1 Condenser
10 Option Box
1
028971-G
Product Description
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9
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5