York Centrifugal Chiller YKEPEPQ55CEGS

Connect a high capacity vacuum pump with indicator to the system charging valve and start the pump.

Open wide all system valves and ensure all valves to the atmosphere are closed.

Operate the vacuum pump until a wet bulb temperature of 0°C or a pressure of 5 mm Hg (absolute) is reached.

Is warm water (not exceeding 50°C) being circulated through the evaporator and condenser tubes to dehydrate the shells?

Close the system charging valve and the stop valve between the vacuum indicator and the vacuum pump, then disconnect the vacuum pump leaving the vacuum indicator in place.

Hold the vacuum in the system for 8 hours and check for any rise in pressure.

After 8 hours, has the wet bulb temperature in the vacuum indicator remained below 4.4°C or pressure below 6.3 mm Hg?

If the vacuum does not hold for 8 hours within the specified limits, was the leak found and repaired?

Check graphic control centre (OptiView) displays.

Check for any signs of dirty or fouled condenser tubes.

Is the compressor in operation?

Enter the bearing oil pressure on the SYSTEM Screen.

Check the oil level in the oil reservoir.

7.1.6 Annually (more often if necessary)

Inspect and service electrical components as necessary

Inspect all electrical controls for obvious malfunctions

Ensure factory settings of controls (operation and safety) are unchanged

Perform chemical analysis of system

Check for potential leak scenarios

Is refrigerant detected at the liquid head vents after shutdown?

Has system capacity and efficiency dropped sharply?

Immediate Actions for Detected Leaks

Valve off evaporator and condenser from the water circuit and drain immediately

Drain and purge the refrigerant system with dry nitrogen

Remove the heads and listen for hissing sounds indicating gas leakage

7.1.6 Annually (more often if necessary)

Drain and replace the oil in the compressor oil sump

Verify the nominal oil charge for the compressor is 75.7 litres of York 'K' oil

Ensure only York 'K' refrigeration oil is used in the centrifugal compressor

Check that the oil is kept tightly capped until used to prevent moisture absorption

Immerse the suction connection of the oil charging pump in a clean container of new oil