Daikin Centrifugal Compressor Water Chiller HSC079

Warning: A dangerous condition can exist if power is applied to a faulty compressor motor starter that has been burned out.

This is a good time to check all the motor winding resistance to ground.

Enter the resistance between any motor terminal and ground.

Whenever great discrepancies in readings occur, or uniform readings of less than 50 megohms are obtained, the motor cover must be removed for inspection of the winding prior to starting the unit.

Uniform readings of less than 5 megohms indicate motor failure is imminent and the motor should be replaced or repaired.

The control circuit must be energized at all times, except during service.

If the control circuit has been off and oil is cool, energize oil heaters and allow 24 hours for heater to remove refrigerant from the oil before starting.

Check and tighten all electrical connections.

Replace the drain plug in the cooling tower pump if it was removed at shutdown time the previous season.

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.

Enter the oil level in the system.

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).

Is the condition of the compressor oil satisfactory?

Test operation of Pump Interlocks

Test operation of Guardistor and Surgeguard

Test operation of High and Low Pressure Cutouts

Test operation of Oil Pump Pressure Differential Cutout

Test operation of Oil Pump Time Delay

At least once a quarter, all equipment protection controls except compressor overloads should be made to operate and their operating points checked.

Check if Pump interlocks and flow switches interrupt the control circuit when tripped.

Inspect and clean the contactors in the motor starter

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: This procedure requires trained personnel with PPE!

Approach temperature within acceptable range?

If approach temperature is not within acceptable range, report the issue to the maintenance team and stop the procedure

Condenser pressure drop within acceptable range?

Enter the condenser pressure drop

If condenser pressure drop is not within acceptable range, report the issue to the maintenance team and stop the procedure

Discharge pressure within acceptable range?