Multiple refrigeration access ports

Liquid line shut-off ball valves

Filter-dryer

Sight glass

Externally equalized thermal expansion valve

Liquid line solenoid

Compressor crankcase heater

Controller Features

Off-the-shelf microprocessor-based PID controller with To Process, From Process and Set Point readout

Time delay for proof of water flow/pressure (models w/pump only)

Low refrigerant pressure time delay for low ambient start-up on remote air-cooled and air-cooled chillers with the variable-speed fan option.

8 line x 22 character display with status, alarm, and service screens

Display has magnetic back and can be mounted anywhere.

Other Features

One year labor warranty and one year compressor warranty

Two year parts warranty

Three year limited controller warranty

2-4 Safety Devices and Interlocks

Caution! Protect the system from freezing with inhibited industrial grade glycol 20ºF below the leaving water temperature set point. Condensation may form inside the pump tank and dilute the mixture, therefore the freezing point should be verified periodically. See Figure 6 on page 18 for the correct mixture.

Crankcase Heater

All of the chillers are equipped with a compressor crankcase heater. It is wired through the control transformer that operates continuously whenever power is applied to the chiller, and the compressors are off.

Caution! Energize the crankcase heater for at least 24 hours before initial startup to drive dissolved refrigerant from the compressor oil. Failure to do so will damage the compressor. If unit is mounted outdoors, power to the unit (and the main power switch) must remain on 24 hours per day, 7 days per week to prevent liquid migration to the compressor.

GP Series Portable Chillers

Chapter 2: Functional Description

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Sterling 882.93092.01 manual Safety Devices and Interlocks, Controller Features, Other Features, Crankcase Heater

882.93092.01 specifications

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