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CG-PRC011-EN
Water-Cooled Liquid Chillers and
Compressor Chillers CGWE and CCAD
Models 20 to 60 Tons
General
All scroll chillers are factory tested and
monitored for power and control
operation (CGWE only). CGWE units
ship with a full operating charge of
refrigerant and oil. Exposed surfaces are
painted with an air-dry beige primer-
finisher prior to shipment.
Compressor-Motor
Direct-drive, hermetic, 3600 rpm, 60 Hz
[300 rpm, 60 Hz] fixed compression,
scroll compressors (20 to 30 tons - two
compressors; 40 to 60 tons - four
compressors). Each compressor has:
centrifugal oil pump, oil level sightglass,
oil charging valve, two point lubrication
for each motor bearing, flooded
lubrication for the journal and thrust
bearings, and a check valve on the scroll
discharge port.
Motor is suction gas-cooled,
hermetically sealed, two-pole, squirrel
cage induction type.
Evaporator
Shell and tube design with seamless
copper tubes roller expanded into tube
sheets. Designed, tested and stamped in
accordance with ASME Code for
refrigerant side working pressure of 300
psig. Water side working pressure is 300
psig for CGWE 20-50 and CCAD 20-60,
215 psig for CGWE 60. One water pass
with a series of internal baffles. Each
shell includes drain connections,
entering and leaving temperature
sensors, and ¾ inch Armaflex II (or
equal) insulation (K= 0.26).
Condenser (CGWE only)
Shell and tube design with seamless
internally enhanced copper tubes.
Designed and tested for refrigerant side
working pressure of 450 psig. Water
side working pressure is 300 psig for
CGWE 20-50, 150 psig for CGWE 60.
Two pass construction with six-inch
diameter shell (20 to 30 tons). One pass
construction with two separate
condensers connected in series (40 to 60
tons). Each condenser includes a
subcooler circuit. Tubes are cleanable
and replaceable.
Refrigerant Circuit
Each refrigeration circuit shall be
completely independent and shall
include liquid line and discharge line
service valves, filter dryer, combination
moisture indicator-sightglass, charging
port, insulated suction line, liquid line
solenoid valve and thermal expansion
valve.
Isolation valves provide means of
isolating refrigerant charge in either the
high or low pressure side while
servicing. One refrigerant circuit on
20 to 30 tons; two refrigerant circuits on
40 to 60 tons.
Condenserless units (CCAD) shall be
equipped with discharge check valve
and moisture indicator sightglass.
Control Panel
Factory-mounted microprocessor based
control panel uses 120/60/1 power.
Automatic shutdown protection with
manual reset is provided for low
evaporator outlet refrigerant
temperature and pressure, high
condenser refrigerant pressure, motor
current overload, and phase reversal.
Automatic shutdown protection with
automatic reset after condition is
corrected is provided for low line voltage
and loss of chilled water flow.
The unit control module (UCM)
automatically takes action to prevent
complete shutdown by shedding
compressors one at a time. This occurs
in the event of low evaporator refrigerant
temperature, high condenser refrigerant
pressure, motor current overload;
preventing the motor current from
exceeding setpoint.
Solid-state chilled water temperature
sensors are included for precise and
accurate control. A menu driven display
indicates the operating code, the last
diagnostic code, chilled water setpoint,
current limit setpoint, condenser water
and chilled water temperature sensors.
Factory-installed entering and leaving
condenser water temperature sensors
(optional) are available for
microprocessor display or Trane Tracer
™
monitoring. Over 40 diagnostic checks
are made and will be displayed when a
problem is detected.
Starter
The unit control panel contains both a
control section and a starter section. The
panel is a painted, NEMA 1 enclosure.
The starter section contains: top access
for power wiring, single point power
hook-up, three-phase solid-state
overload protection, customer wired
grounding lug, and control power
transformer with fused protection.
Mechanical
Specifications