Section 2 Product Description; Introduction; General Description; Compressor - York MILLENNIUM YCAS 250 Manual

Product Description
1 System Fans
2 System 1 Power Panel
3 System 2 Power Panel
4 Control Panel
5 Power Entry
6 System 2 Compressor
7 Cooler (Evaporator)
8 System 4 Compressor
9 System 2 Condenser
10 Option Box
FIG. 1 – COMPONENT LOCATIONS

INTRODUCTION

YORK YCAS Millennium chillers are designed for
water or water-glycol cooling. All units are designed to
be located outside on the roof of a building or at ground
level.
The units are completely assembled with all intercon-
necting refrigerant piping and internal wiring, ready for
field 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 flowing
through the cooler to ensure that each refrigerant cir-
cuit operates correctly.
The unit structure is manufactured from heavy gauge,
galvanized steel. All external structural parts are coated
with "Desert Sand" baked-on enamel powder paint. This
provides a finish 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 (equiva-
lent to ASTM D1654 rating of "6").
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PRODUCT DESCRIPTION
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All exposed power wiring is be routed through liquid-
tight, non-metallic conduit.

General Description

The Air Cooled Screw Chiller utilizes many compo-
nents which are the same or nearly the same as a stan-
dard reciprocating chiller of a similar size. This includes
modular frame rails, condenser, fans and evaporator.
The chiller consists of 2, 3 or 4 screw compressors in a
corresponding number of separate refrigerant circuits,
a single shell and tube DX evaporator, economizers, 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 efficiencies and reliable per-
formance. Capacity control is achieved through a single
slide valve. The compressor is a positive displacement
type characterized by two helically grooved rotors
which are manufactured from forged steel. The 60 Hz
motor operates at 3550 RPM to direct drive the male
rotor which in turn drives the female rotor on a light
film of oil.
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YORK INTERNATIONAL
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