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GP Series Portable Chillers Chapter 2: Functional Description 11 of 90
Air-Cooled Condenser – Aluminum fin/ tube with washable filters, packaged units only.
Variable speed fan control standard for all remote air cooled condensers and GPAC70
through 210. Optional on GPAC20 through 50.
Water-Cooled Condenser – Tube-in-tube condensers (GPWC20 – GPWC50), Shell-and-
tube condensers (GPWC70 – GPWC210). All come with electronic cooling water regulating
valves.
Remote Air-Cooled Condenser– Aluminum fin/tube with low ambient control down to
–20ºF (-29ºC) via variable-speed fan(s).
Reservoir – GP20 and GP30 models use a 20 gallon (75 liter) polyethylene tank, GP40 and
GP50 models use a 40 gallon (150 liter) polyethylene tank, GP70 thru GP105 models use a
70 gallon (265 liter) polyethylene tank, GP140 thru GP210 models use a 140 gallon (530
liter) polyethylene tank. 304SS is available as an option for all sizes.
Piping – Non-ferrous chilled water 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, polyester powder coat painted cabinetry
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 via operator interface
Pump pressure indication via operator interface
Electrical Features
Fully accessible NEMA 4/12-style electrical control enclosure
Single-point power and ground connection
Non-fused disconnect switch, lockable
Branch circuit protection
208-230/3/60, 460/3/60, 575/3/60 volt; 400/3/50 volt
Refrigeration Features
HFC-410a refrigerant
Electronic modulating hot gas bypass capacity control
High refrigerant pressure cutout switch (manual reset)
Suction and discharge pressure transducers.
High refrigerant pressure spring actuated relief valve