Technical data

2 Product Description
2.1 General (Figures 2.1 and 2.2)
The York YS
Millennium ™ Rotary Screw Liquid Chiller
is primarily used for large air conditioning systems, but
may be used on other applications. Each unit is
completely factory-packaged including compressor,
evaporator, condenser, subcooler, oil separator,
lubrication system, isolation valves, drive motor,
optional motor starter and control centre.
Units are shipped as standard with a full charge of
refrigerant and oil. Units can also be shipped in sections
(optional) to accommodate job site requirements. An
optional shipping skid is also available for ease of
handling.
Exterior surfaces are protected with one coat of
Caribbean blue machinery paint.
2.2 Compressor
The rotary screw compressor uses state-of- the-art
technology to provide the most reliable and energy
efficient compressor available at all operating
conditions. The compressor is a positive displacement,
variable volume, direct drive, twin helical rotary screw
compressor. The male rotor is a direct drive by the
motor; the female rotor is an idler that is driven by the
male rotor. The rotors do not touch each other or the
compressor housing. The rotors are separated by a
hydraulic oil seal, which prevents high pressure gas
from leaking into low pressure areas.
The compressor housing is made of cast iron, precision
machined to provide minimal clearance for the rotors.
The housing has a design working pressure (DWP) of
24.1 bar and is hydro-tested at 37.5 bar.
035L02381-GB0 2-1
MOTOR
TERMINAL BOX
MOTOR
COMPRESSOR
RUPTURE
DISK
RELIEF VALVE
RELIEF VALVE
RELIEF VALVE
CONDENSER
COOLER
MICROCOMPUTER
CONTROL CENTRE
SIGHT GLASS
OIL
SEPARATOR
Figure 2.1 YS Rotary Screw Liquid Chiller (Front View)