Daikin Water Chiller WDC126

Warning: This procedure requires trained personnel with PPE!

Daikin chillers are at positive pressure at all times and do not leak contaminated moist air into the refrigerant circuit, thereby eliminating the need for annual oil changes.

An annual laboratory oil check is recommended to check overall compressor condition.

Isolate the filter cavities. Close the oil discharge line service valve at the oil pump (at the filter on CE126).

Remove the filter cover; some foaming can occur but the check valve should limit leakage from other compressor cavities.

Remove the filter, replace with new element, and replace filter cover using a new gasket.

Reopen the valve in the pump discharge line and purge air from the oil filter cavity.

When machine is operated again, the oil level must be checked to determine if oil needs to be added to maintain the proper operating level.

Sign off on the oil filter replacement

Maintenance of the refrigerant cycle includes maintaining a log of the operating conditions, and checking that the unit has the proper oil and refrigerant charge.

Record the condenser water temperature

Record the chiller water temperature

Record the suction line temperature at the compressor

Calculate the suction superheat by subtracting the saturated temperature equivalent of the suction pressure from the suction line temperature.

Note any extreme changes in subcooling and/or superheat over a period of time. These may indicate losses of refrigerant or possible deterioration or malfunction of the expansion valves.

Warning: Do not use oxygen or a mixture of R-22 and air to build up pressure as an explosion can occur causing serious personal injury.

Loss of the entire refrigerant charge?

Enter the pressure after charging refrigerant

Enter the pressure after adding dry nitrogen

Leak test with an electronic leak detector passed?

Water flow through the vessels maintained?

Any leaks found in welded or brazed joints?

Is it necessary to replace a gasket?

If any leaks are found in welded or brazed joints, or it is necessary to replace a gasket, relieve the test pressure in the system before proceeding.

Is the chiller subject to freezing temperatures?

If yes, drain the condenser and chiller of all water.

Use dry air to force all water out of the condenser.

Ensure no water remains in the piping and vessels to avoid rupture due to freezing.

Circulate antifreeze through the water circuits to avoid freeze up.

Have measures been taken to prevent the shutoff valve in the water supply line from being accidentally turned on?

If a cooling tower is used, has the water pump been drained and left open to avoid water accumulation?

Calibrate Temperature Transducers

Check Vane Control Setting and Operation

Verify Motor Load Limit Control

Sign off on the operating controls maintenance