Daikin Water Chiller WDC063

Warning: This procedure requires trained personnel with PPE!

Enter the leaving water temperature

Enter the saturated refrigerant temperature

Calculate the approach temperature (subtract the saturated refrigerant temperature from the leaving water temperature)

Note: Daikin's high efficiency heat exchangers have very low design approach temperatures, in the order of one to one and one half degrees F.

Is the approach temperature within the normal range?

If not, describe the potential issues

Enter the condenser pressure drop

Is the condenser pressure drop within the normal range?

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 amount of oil added to the system.

Upload a photo of the hand pump connected to the backseat port of the valve.

Note: The POE oils used with R-134a are hygoscopic. Avoid exposure to moisture (air).

Is the condition of the compressor oil satisfactory?

Maintenance of the refrigerant cycle

Record the condenser water temperature

Record the chiller water temperature

Record the suction line temperature at the compressor

Calculate the suction superheat by subtracting the saturated temperature equivalent of the suction pressure from the suction line temperature

Note any extreme changes in subcooling and/or superheat over a period of time

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.

Warning: This maintenance check requires trained personnel with PPE!

Enter the leaving water temperature

Enter the saturated refrigerant temperature

Calculate the approach temperature (subtract saturated refrigerant temperature from leaving water temperature)

Note: Daikin's high efficiency heat exchangers have very low design approach temperatures, in the order of one to one and one half degrees F.

Enter the condenser pressure drop

Note: An approach increase of two-degrees or more would indicate that excessive tube fouling could be present. Higher than normal discharge pressure and motor current are also good indicators.

Does the approach temperature increase by two-degrees or more?

Is the discharge pressure higher than normal?