Daikin Centrifugal Compressor Water Chiller WCC126

Warning: Only fully qualified technicians must attempt service.

Power factory correction capacitors disconnected?

Terminal Check (Infrared temperature measurement)

Motor Cooling Filter Drier Pressure Drop

Enter the pressure drop reading

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

Leak test with an electronic leak detector passed?

Water flow through the vessels maintained during the procedure?

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.

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.

IMPORTANT: At this point, the charging procedure should be interrupted and prestart checks made before attempting to complete refrigerant charge. The compressor must not be started at this time. (Preliminary check must first be completed.)

NOTE: It is of utmost importance that all local, national, and international regulations concerning the handling and emission of refrigerants are observed.

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.

The suction line temperature at the compressor should be taken at least once a month.

Warning: This procedure requires trained personnel with PPE!

If the approach temperature has increased by two-degrees or more, excessive tube fouling could be present.

Is the discharge pressure higher than normal?

Is the motor current higher than normal?

If either of the above checks are 'PASS', proceed to inspect the condenser tubes.

Are the condenser tubes fouled?

If 'PASS', proceed to clean the condenser tubes.

Instructions for removing the dished water heads