Daikin Water Chiller WCC076

Calibrate Temperature Transducers

Check Vane Control Setting and Operation

Verify Motor Load Limit Control

Sign off on the operating controls maintenance

Examine Contactors (hardware and operation)

Verify Overload Setting and Trip

Test Electrical Connections (Infrared temp measurement)

Sign off on the air compressor starter maintenance

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.

Suction line temperature at the compressor

Subtracting the saturated temperature equivalent of the suction pressure from this will give the suction superheat.

Warning: This procedure 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.

It is recommended that benchmark readings (including condenser pressure drop to confirm future flow rates) be taken during startup and then periodically afterward.

Enter the condenser pressure drop

Is the approach increase two-degrees or more?

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.