York Centrifugal Chiller YKNQNPK25CNGS

Check for potential leak scenarios

Is there a hissing sound indicating gas leakage?

Wash off both tube heads and the ends of all tubes with water

Blow out the tubes with nitrogen or dry air

Pressurize the dry system with nitrogen

Record the time tubes have been corked

Test each tube for leaks after corking period

Mark any leaking tubes for later identification

Remove refrigerant charge when opening any part of the refrigerant system for repairs

Isolate refrigerant in condenser or evaporator/compressor if optional valves are equipped

Add only refrigerant vapour to the system until pressure is above freezing point

Ensure system pressure is above 58.9 kPa for R134a to prevent freezing

Prevent moisture laden air from entering the system during charging

Make up a suitable charging connection from new copper tubing

Ensure charging connection is short but flexible enough for changing drums

Purge charging connection each time a new container of refrigerant is connected

Perform chemical analysis of oil

Repair any leaks found immediately

Leak test the system with a R134a compatible leak detector

Repair any leaks found immediately

Tighten flare nuts or flange bolts to stop leaks

7.1.5 Every 6 Months (or more often as required)

Change and inspect compressor oil filter element.

Inspect for internal wearing of compressor parts due to improper lubrication.

Is the unit shutting down on High Oil Temperature or Low Oil Pressure?

Change the oil filter element if the unit is shutting down on High Oil Temperature or Low Oil Pressure.

Examine the oil filter element for the presence of aluminum particles.

Are aluminum particles found in the oil filter?

If aluminum particles are found, describe the findings and notify the nearest York office.

7.4.1 Checking The Refrigerant Charge

Observe and record the refrigerant level after initial charging

Ensure the refrigerant level is visible in the sight glass

Check and trim the refrigerant charge when the system is shut down

Verify that the pressure and temperature have equalised between the condenser and evaporator

Confirm that 4 hours or more have passed since the compressor and water pumps were stopped