York Screw Chiller YCIV0187VA46

Warning: This procedure requires trained personnel with PPE!

Enter the amount of chiller refrigerant charge

Reference the chiller nameplate or factory order form (FOF) to determine the required charge

Is the refrigerant charge level correct during operation?

For new sales, design values are included as part of the FOF

Enter the evaporator approach value

Enter the discharge superheat value

Definitions: EST = Evaporator Saturation Temperature, LCHLT = Leaving evaporator liquid temperature, DT = Compressor Discharge Temperature, CST = Condenser Saturation Temperature

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

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 a 100% pure R-134a system at DWP

Are all joints tight and leak-free?

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

Have all face seal nuts and flange bolts been 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

Check programmable operating setpoints and safety cutouts and ensure they are correct for the application

Check compressor and evaporator heater operation

Check for dirt in the control panel

Check door gasket sealing integrity