Technical data

2 Product Description
2.1 General (Figure 2.1)
The York YR 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 panel.
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 rotors are manufactured from forged steel and use
asymmetric profiles. The compressor incorporates a
complete anti-friction bearing design for reduced power
and increased reliability. Four separate cylindrical roller
bearings handle radial loads. Two 4-point angular
contact ball bearings handle axial loads. Together they
maintain accurate rotor positioning at all pressure ratios
thereby minimising blow-by and maintaining efficiency.
160.81-ICOM-GB0 (01/02) 2-1
COMPRESSOR
VARIABLE ORIFICE
SOLID STATE
STARTER
CONDENSER
EVAPORATOR
OPTIVIEW
CONTROL PANEL
SIGHT GLASS
OIL
SEPARATOR
Figure 2.1 YR Rotary Screw Liquid Chiller (Front View)