Daikin Single Screw Chiller ZUWV

Check at intervals as specified and replace when the component is abnormal and the replacing standard is met.

- Electric expansion valve(capacity control)

Check color of compressor oil. New oil is clean and the dark brown or cloudy oil shall be replaced; the compressor shall be overhauled when the oil turns dark.

Check the color of the sight glass on the liquid supply pipe. Yellow indicates that the water content of refrigerant is out of limits. Heating: the liquid supply pipe is filled with refrigerant liquid and has no bubble, Cooling: there has no bubble or little bubble at the normal condition.

Check any leakage of the refrigerant circuit. Check any oil strain or leakage around the pipeline.

Check the differential oil pressure. The difference between high pressure and oil pressure shall not exceed 1.5 bar during operation, or the oil filter shall be replaced.

Sign off on the chiller inspection

a. Contact with other maintenance managers before maintenance.

b. Make sure that you familiar with safety precautions.

c. Please select “Local” on the HMI if you needn’t remote operation to avoid auto-running by remote signals.

d. Warning signs should be hung in a prominent position when the chiller is being maintained.

a. Check the chilled water state.

Change the polluted water in the system if the chilled water quality get worse.

Adjust to a correct value if the Ethylene glycol solution concentration reduces below the setting point.

Check at intervals as specified and replace when the component is abnormal and the replacing standard is met.

- Bearing (Screw and Star wheel)

- Electric expansion valve(capacity control)

Oil level check through Oil sight glass

Check the motor overload protector (trip or not)

If motor overload protector tripped, state the reason of trip

Discharge superheat degree of compressor

Sign off on the daily chiller inspection