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RLC-PRC016-EN
Mechanical
Specifications
Refrigeration Circuits
Each unit has two refrigerant circuits,
with one rotary screw compressor per
circuit. Each refrigerant circuit includes a
compressor suction and discharge
service valve, liquid line shutoff valve,
removable core filter drier, liquid line
sight glass with moisture indicator,
charging port and an electronic
expansion valve. Fully modulating
compressors and electronic expansion
valves provide variable capacity
modulation over the entire operating
range.
Unit Controls
All unit controls are housed in a
weathertight enclosure with removable
plates to allow for customer connection
of power wiring and remote interlocks.
All controls, including sensors, are
factory mounted and tested prior to
shipment. All cataloged units are
UL listed.
Microcomputer controls provide all
control functions including start-up and
shut down, leaving chilled water
temperature control, compressor and
electronic expansion valve modulation,
fan sequencing, antirecycle logic,
automatic lead/lag compressor starting
and load limiting.
The unit control module, utilizing
Adaptive Control
™
microprocessor,
automatically takes action to avoid unit
shutdown due to abnormal operating
conditions associated with low
refrigerant temperature, high condensing
temperature and motor current overload.
Should the abnormal operating condition
continue until a protective limit is
violated, the unit will be shut down.
Unit protective functions include loss of
chilled water flow, evaporator freezing,
loss of refrigerant, low refrigerant
pressure, high refrigerant pressure,
reverse rotation, compressor starting
and running over current, phase loss,
phase imbalance, phase reversal, and
loss of oil flow.
A menu driven digital display indicates
over 20 operating data points including
chilled water setpoint, current limit
setpoint, leaving chilled water
temperature, evaporator and condenser
refrigerant pressures and temperatures.
Over 60 diagnostic checks are made and
displayed when a problem is detected.
The digital display can be read and
advanced on the unit without opening
any control panel doors.
Standard power connections include
main three phase power and two 115
volt single phase power connections for
control power and heat tape.
Starters
Starters are housed in a weathertight
enclosure with removable cover plate to
allow for customer connection of power
wiring. Across-the-line starters are
standard on all 460-575 volt units. An
optional Wye Delta closed transition
starter (33 percent of LRA inrush) is
available. Typically, Trane helical rotary
compressors are up to full speed in one
second when started across-the-line and
have equivalent inrush with similar size
reciprocating compressor with part wind
starters.