York Screw Chiller YCIV0247PA46

This procedure must be performed at the specified time by an industry certified technician who has been trained and qualified to work on this type of equipment.

A record of this procedure being successfully carried out should be maintained on file by the equipment owner should proof of adequate maintenance be required at a later date for warranty purposes.

Sample compressor oil, check for acid, and replace if necessary.

Disconnect power source and lock out and check tightness of power wiring connections.

Check glycol concentration on low temperature or other applications where freezing may be a problem.

Warning: This procedure should only be performed by a qualified technician.

Has the system been carefully pressure tested and evacuated at the factory?

Enter the leak rate for the R-134a system at DWP

Are all joints tight and leak-free?

If any leaks are indicated, they must be repaired immediately.

Can leaks be stopped by ensuring that face seal nuts and flange bolts are correctly torqued?

For any major repair, the refrigerant charge must be removed and the system leak checked using reliable methods like a pressure test.

Refrigerant charge removed and all known leaks repaired?

System charged with a small amount of refrigerant mixed with dry nitrogen?

Electronic leak detector used to detect any small leaks?

Unit refrigerant pressure relief valves not exceeded?

Conducting the gas pressure hold test

High-quality, high-resolution analog pressure gauge installed on one of the service valves?

All system valves including manual valves and EEVs are 100% open?

All valves to the atmosphere are closed with flare caps in place, if applicable?

This procedure must be performed by an industry certified technician

Maintain a record of this procedure for warranty purposes

Superheat on the economizer feed to the compressor

Connect a high-capacity vacuum pump with indicator to the charging valves

Ensure all the system valves including manual valves and EEVs are 100% open

Ensure that all valves to the atmosphere are closed with flare caps in place, if applicable

Operate the vacuum pump until a pressure of 5,000 μm is reached

To start the 8-hour vacuum hold test, close the system charging valve connection to the vacuum pump

Hold the vacuum obtained in Step 4 in the system for 8 hours

Check for pressure change with the chiller at the same temperature