Caution! Do not use steam or water over 140ºF (60ºC) to clean a condenser unless you are monitoring the refrigeration circuit for excessive pressure with gauges. Only a trained technician should use this method.

5-4 Maintaining the Evaporator

Dirty evaporator heat exchange surfaces reduce system capacity and efficiency. Remove dirt and slime in the evaporator by reverse-circulating with a mild detergent and water solution.

Remove mineral deposits by reverse-circulating Liquid Citric Acid De-Scaling Solution (Part No. A0536607). Follow the directions on the container.

5-5 Evaporator Process Piping Y-Strainer

The process piping Y-strainer requires periodic cleaning of its screen to insure the proper flow through the evaporator. To clean the strainer screen, remove the access plug and retaining cap, and pull out the screen.

Wipe, brush, or vacuum out any dirt left in the strainer body. Clean the screen and replace it in the strainer taking care to fit it squarely into the machined seat provided.

Caution! Do not forget to re-install the screen after cleaning it. Operating the chiller with no strainer screen can potentially plug the evaporator with dirt. The warranty does not cover chiller failures from a dirty evaporator.

5-6 Preventative Maintenance Service

Follow a systematic preventive maintenance program to help avoid costly down time. Call the Service Department to arrange a schedule of inspections. This service can be tailored to fit your maintenance requirements. These inspections include, but are not limited to:

•Checking refrigerant suction and discharge pressures

•Checking safety and operating conditions

•Checking voltage and amperage of all motors

•Checking all electrical connections

•Checking quantity of refrigerant

•Checking compressor oil level on units with tandem compressors

•Checking lubrication of motor and pump bearings

•Checking circulating pump operation

•Checking flow through heat exchangers

•Checking compressor efficiency

•Checking noise levels

GP Series Portable Chillers

Chapter 5: Maintenance

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Sterling 882.93092.00 Maintaining the Evaporator, Evaporator Process Piping Y-Strainer, Preventative Maintenance Service
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