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GP Series Portable Chillers Chapter 2: Functional Description 11 of 44
interlock. The alarm signals anytime that a fault is recognized during the operation of the
chiller.
Communications Options. RS-485 serial Modbus communications.
High Pressure Fans. Provides for an additional 1.0”WC (250 Pa) of static pressure on fan
discharge. High-pressure fans are necessary and must be included in chiller installations
where exiting air exhausts through ductwork.
They can be retrofitted without sheet metal modification, but will require changing out fan
blades, and in some cases, fan motors and electrical components.
Variable Speed Fan. Reduces the speed of the fan based on entering air temperature and
system load, allowing the chiller to operate in ambient temperatures below 60ºF (15.5ºC).
This option will also reduce fan noise in ambient temperatures below 95ºF (35ºC).
Stainless Steel Reservoir. 5 hp to 15 hp models only. Manufactured from 304 stainless steel.
Mounting Features.
• Mounting rails with feet
Optional Operating Voltages. 208-230/3/60, 575/3/60, and 400/3/50 volt available
UL Labeled Electrical Subpanel. Provides for the subpanel to be listed with Underwriters
Laboratory, with UL-related benefits and features.
Optional Pumps. Pump options are available for greater pressure and flow rates. A
recirculation pump is required whenever process water flow is less than 1.2 gpm per ton or
greater than 4.8 gpm per ton. See Figure 1 on page 12 for optional pump amperages.
NEMA 4 Electrical Enclosure. Provides for NEMA 4-level electrical enclosure protection.