Cold Generator™ Scroll Chillers CGWR Series - Weekly Maintenance

Once the unit has been operating for about 10 minutes and the system has stabilized, check operating conditions and complete the checkout procedures that follow.

• Check compressor oil levels. Oil should be visible in the sight glass when the compressor is running. Operate the compressors for a minimum of three to four hours when checking oil level, and check level every 30 minutes. If oil is not at proper level after this period, have a qualified service representative add or remove oil as required.

• Check suction pressure and discharge pressure.

• Check the liquid line sight glasses.

• If operating pressures and sight glass conditions seem to indicate refrigerant shortage, measure system superheat and system sub-cooling.

• If operating conditions indicate an overcharge, slowly (to minimize oil loss) remove refrigerant at the liquid line service valve.

• Inspect remote condenser coils for cleanliness (CCAR only) and clean if required. Refer to the condenser manufacturer’s recommendations.

Inspect the entire system for unusual conditions. Use an operating log to record a weekly operating conditions history for the unit. A complete operating log is a valuable diagnostic tool for service personnel.

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