Daikin Water Chiller WDC076

Warning: Only trained personnel should perform this procedure.

Is the system operating normally?

If repair work becomes necessary to the oil pump, or a large amount of oil is lost from the system due to a leak, oil must be added.

Upload a photo of the hand pump connected to the backseat port of the valve in the lubricant drain from the compressor to the sump.

Is the POE oil used with R-134a exposed to moisture (air)?

The condition of compressor oil can be an indication of the general condition of the refrigerant circuit and compressor wear.

Upload the annual oil check report from a qualified laboratory.

It is useful to have an oil analysis at initial startup to provide a benchmark from which to compare future tests.

Enter the name of the local Daikin service office that can recommend suitable facilities for performing these tests.

Clean Oil Cooler Strainer (water)

Oil filter change and compressor teardown and inspection should be done based on the results of the annual oil test performed by a company specializing in this type of test.

Consult Daikin Service for recommendations

Sign off on the lubrication system maintenance

WSC and WDC water chillers are leak tested at the factory and shipped with the correct charge of refrigerant as indicated on the unit nameplate.

In the event the refrigerant charge was lost due to shipping damage, the system should be charged as follows after first repairing the leaks and evacuating the system.

Leaks repaired and system evacuated?

Connect the refrigerant drum to the gauge port on the liquid line shutoff valve and purge the charging line between the refrigerant cylinder and the valve. Then open the valve to the mid-position.

Turn on both the cooling tower water pump and chilled water pump and allow water to circulate through the condenser and the chiller. (It will be necessary to manually close the condenser pump starter.)

If the system is under a vacuum, stand the refrigerant drum with the connection up, and open the drum and break the vacuum with refrigerant gas to a saturated pressure above freezing.

With a system gas pressure higher than the equivalent of a freezing temperature, invert the charging cylinder and elevate the drum above the condenser.

With the drum in this position, valves open, water pumps operating, liquid refrigerant will flow into the condenser. Approximately 75% of the total requirement estimated for the unit can be charged in this manner.

After 75% of the required charge has entered the condenser, reconnect the refrigerant drum and charging line to the service valve on the bottom of the evaporator.

Examine Contactors (hardware and operation)

Verify Overload Setting and Trip

Test Electrical Connections (Infrared temp measurement)

Sign off on the air compressor starter maintenance

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.

Enter the initial pressure of the system in psig

Enter the pressure after adding refrigerant in psig

Enter the pressure after adding dry nitrogen in psig

Did the electronic leak detector find any leaks?

Was water flow maintained during the procedure?

Were any leaks found in welded or brazed joints?

Was 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. Brazing is required for copper joints.