INSTALLATION GUIDE • USER MANUAL
5
PACKAGE CHILLER DESCRIPTION
CONDENSER
AIR COOLED
– Standard configuration. Copper tube
aluminum fin condenser coil or micro-channel
condenser coil. Direct drive propeller type fans with
DDP motors and built-in overload protection. Design
test pressure 150 PSIG low side, 300 high side.
LIQUID COOLED
– Optional configuration. Brazed
plate counterflow condenser with water regulation
valve. Shell and tube condensers available for custom
units.
EVAPORATOR
Brazed plate counterflow heat exchanger fed by
electronic expansion valve.
COMPRESSOR
Hermetically-sealed Maneurop compressor with oil
level sight glass, rotalock service valves, and
crankcase heater.
CIRCULATION PUMP
End suction centrifugal pump with impeller trimmed
for 35% propylene glycol mixture. Base mounted.
Pump fitted with union, check valve, and supply and
return shut off valves for service. Variable frequency
drives available upon request.
RESERVOIR TANK
Constructed of molded, seamless high-density cross-
linked polyethylene or stainless steel. Insulated with
½” closed cell foam. Glycol level indicator. Auxiliary
ports standard on most units.
SUPPLY & RETURN PIPING
Constructed of type M copper. Ball valves or flanges
provided for field connection of supply and return
piping. Liquid-filled pressure gauge for setting
discharge pressure.
DYNAMIC FLUID BYPASS VALVE
Allows for balancing of discharge pressure. Over
pressure design allows circuiting back to tank without
damage to system or pump. Copper and bronze
construction.
REFRIGERANT PIPING
Type L ACR copper. Liquid line-filter drier, sight
glass/moisture indicator, solenoid valve and
electronic expansion valve with equalizer. Suction line
fully insulated and designed for proper oil return with
minimum friction loss. Discharge line formed of ACR
tubing reformed radius fittings. All piping leak tested
and evacuated. Ships with full operating charge of
refrigerant, refer to data plate for refrigerant type
and charge per circuit.
FRAME & HOUSING
Fully powder coated steel frame. Durable powder
coated aluminum housing rated for outdoor use.
Louvered access panels for easy service and
maintenance.
POWER & CONTROLS
A single-point electrical connection is provided for
terminating the chiller power wiring. All power
starting controls and safety/operating controls are
mounted in a weatherproof steel NEMA 3R enclosure.
Features include:
•
Programmable logic controller (PLC)
•
On / pump down / off door switch
•
Compressor contactor and circuit breaker
•
Pump contactor and circuit breaker
•
Pressure-based mechanical safeties
•
Flow switch interlock
•
Freeze protection interlock
•
High temperature alarm
•
Low ambient control
•
Compressor anti short cycle timer
•
Fan cycling switches (air cooled units)
•
Water regulating valve (water cooled units)
FACTORY TESTING
All chillers are run tested at the factory and verified
to be in perfect working order prior to shipment.
G&D CHILLERS, INC.
•
GD
-20-27H
-
M
S
_CRL-r2021A
GD-20H & GD-27H
MODELS