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Operating Principles
Compressor and Lube Oil System
The rotary screw compressor is semi-hermetic, direct
drive, with rolling element bearings, differential
refrigerant pressure oil pump and oil heater. The motor
is a suction gas cooled, hermetically sealed, two-pole
squirrel cage induction motor.
Capacity control is done via a slide valve on fi xed speed
compressor on SE, HE and XE versions.
An adaptive frequency drive provides capacity control of
the lead compressor on each circuit on HSE/HSS version.
For maximum effi ciency, larger tonnage units utilize both
fi xed speed and variable speed compressors staged in
the same circuit.
Oil separator is provided separate from the compressor.
Oil fi ltration is provided internal to the compressor.
Check valves in the compressor discharge and lube oil
system are also provided.
Condenser and Fans
The air cooled Microchannel condenser coils use all
aluminum brazed fi n construction.
The coil is composed of three components: the fl at
microchannel tube, the fi ns located between the
microchannel tubes, and two refrigerant manifolds. Coils
can be cleaned with high pressure water (see Condenser
Coils MCHE maintenance for instructions).
The condenser coil has an integral subcooling circuit.
The maximum allowable working pressure of the
condenser is 25.0 bars. Condensers are factory proof and
leak tested at 45 bars.
Direct-drive vertical-discharge airfoil condenser fans are
dynamically balanced.
Evaporator
The evaporator is a shell and tube heat exchanger design
constructed from carbon steel shells and tube sheets
with internally and externally fi nned seamless copper
tubes mechanically expanded into the tube sheets. Tubes
are cleanable with dismountable water boxes. Tubes
diameter exterior is 19mm. Each tube is individually
replaceable.
The evaporator is designed, tested and stamped in
accordance with PED 97/23/EC or 2014/68/EU Pressure
regulation for a refrigerant side working pressure of
14 bars. Standard water connections are grooved for
Victaulic style pipe couplings. Water boxes are available
in 1 or 2 passes confi gurations according to unit size and
include an air vent, a drain and fi ttings for temperature
control sensors. Evaporator is insulated with closed cell
insulation.
RLC-SVX19J_SHORT-GB
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