Daikin Centrifugal Compressor Water Chiller HSC100

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

Calibrate Temperature Transducers

Check Vane Control Setting and Operation

Verify Motor Load Limit Control

Sign off on the operating controls maintenance

Clean Oil Cooler Strainer (water)

Oil filter change and compressor teardown and inspection should be done based on the results of the annual oil test performed by a company specializing in this type of test.

Enter the results of the oil test

Consult Daikin Service for recommendations.

Sign off on the lubrication system maintenance

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?

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.

If readings are less than 50 megohms, the motor cover must be removed for inspection of the winding prior to starting the unit.

If readings are less than 5 megohms, motor failure is imminent and the motor should be replaced or repaired.

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.

All electrical connections checked and tightened?

Drain plug in the cooling tower pump replaced if it was removed at shutdown time the previous season?