Daikin Water Chiller WSC079

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.

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.

Again purge the connecting line, stand the drum with the connection up, and place the service valve in the open position.

Warning: Only trained personnel should perform this procedure.

If the system is not operational, report the issue to the maintenance team and stop the procedure.

Is there any oil leak in the system?

If there is an oil leak, repair work is necessary.

Upload a photo of the oil pump.

Note: The POE oils used with R-134a are hygoscopic and care must be exercised to avoid exposure to moisture (air).

Enter the oil level in the system.

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

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

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.

Enter the results of the oil test

Consult Daikin Service for recommendations.

Sign off on the lubrication system maintenance

1) Re-sample after 500 hours of unit operation.

a) If content increases less than 10%, change oil and oil filter and re-sample at normal interval (usually annual).

b) If content increases between 11% and 24%, change oil and oil filter and re-sample after an additional 500 hours of operation.

c) If content increases more than 25%, inspect compressor for cause.

2) Re-sample after 500 hours of unit operation.

a) If content increases less than 10%, change filter-drier and re-sample at normal interval (usually annual).

b) If content increases between 11% and 24%, change filter-drier and re-sample after an additional 500 hours of operation.

c) If content increases more than 25%, monitor for a water leak.