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GP Series Portable Chillers Chapter 2: Functional Description 8 of 73
The refrigerant is compressed in the compressor and flows through the discharge line as a gas
to the condenser. There it gives up its heat as it condenses to a liquid in the condenser.
An electronic hot gas bypass valve is used to control cooling capacity during intermittent or
partial load conditions. This feature contributes substantially to chiller longevity by
eliminating excessive cycling of the compressor and providing close temperature control.
2-3 Standard Features
Mechanical Features
Compressor. Hermetic scroll compressors.
Evaporator. Stainless steel copper brazed plate evaporators.
Air-Cooled Condenser. Aluminum fin/ tube with washable filters, package unit only (option
on remotes). Variable speed fan control standard for GPAC70 thru 210.
Water-Cooled Condenser. Tube-in-tube condensers (5-15 ton), Shell-and-tube condensers
(20-60 ton). All come with electronic cooling water regulating valves. 1 in. NPT valves for
GPWC20 & 30; 1.25 in. NPT valves for GPWC40; 1.50 in. NPT valves for GPWC50, 2 in
NPT valves for GPWC70 & 90, 2.5 in NPT valves for GPWC105, 3 in NPT valves for
GPWC140 & 175, and 4 in NPT valves for GPWC210.
Remote Air-Cooled Condenser. Aluminum fin/tube with low ambient control down to –
20ºF (-29ºC) via a variable-speed primary fan.
Reservoir. 5 hp and 7.5 hp models use a 20 gallon polyethylene tank. 10 hp and 15 hp
models use a 40 gallon polyethylene tank.
Piping. Non-ferrous piping
Pump. ODP motors (TEFC Optional)—horizontally mounted stamped stainless steel
construction.
Other Mechanical Features
• Low process water thermal flow switch
• NEMA-rated fan motor(s) on air-cooled models
• Galvanized structural steel frame, painted cabinetry, with 4” (locking) swivel casters
• Internal process water bypass valve for system protection only
• Fully insulated refrigeration and process water piping
• 20 mesh Y strainer on process water piping into the evaporator
• Tank level indication
• Pump pressure indication
Electrical Features
• Fully accessible NEMA 12-style electrical control enclosure
• Single-point power and ground connection
• Non-fused disconnect switch, lockable
• Branch circuit fusing