Daikin Water Chiller WCC113

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.

Is the approach temperature within the normal range?

If not, excessive tube fouling could be present.

Enter the condenser pressure drop

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: Benchmark readings should be taken during startup and then periodically afterward.

Is the approach increase two-degrees or more?

If yes, excessive tube fouling could be present.

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.

Warning: Do not use oxygen or a mixture of R-22 and air to build up pressure as an explosion can occur causing serious personal injury.

Enter the initial pressure of the system in psig

Enter the pressure after adding refrigerant in psig

Enter the pressure after adding dry nitrogen in psig

Did the electronic leak detector find any leaks?

If leaks are found in welded or brazed joints, or it is necessary to replace a gasket, relieve the test pressure in the system before proceeding.

Were any leaks found in welded or brazed joints?

Was it necessary to replace a gasket?

After making any necessary repair, the system must be evacuated as described in the following section.

Is the chiller subject to freezing temperatures?

If yes, drain the condenser and chiller of all water.

Use dry air to force all water out of the condenser.

Ensure no water remains in the piping and vessels.

Consider forced circulation of antifreeze through the water circuits.

Have measures been taken to prevent the shutoff valve in the water supply line from being accidentally turned on?

If a cooling tower is used, has the water pump been drained and left open to prevent water accumulation?