Daikin Water Chiller WCC100

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.

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)

If the approach temperature is more than two degrees, excessive tube fouling could be present.

Enter the condenser pressure drop

Is the discharge pressure higher than normal?

Sign off on the Evaporator Temperature Approach Maintenance

Maintain a log of the operating conditions, and check that the unit has the proper oil and refrigerant charge.

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.

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.

Loss of the entire refrigerant charge?

Enter the pressure after charging refrigerant (psig)

Enter the pressure after adding dry nitrogen (psig)

Leak test with an electronic leak detector passed?

Water flow through the vessels maintained?

Any leaks found in welded or brazed joints?

If any 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. Brazing is required for copper joints.

Is the chiller subject to freezing temperatures?

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

Is all water forced out of the condenser?

Is there water remaining in the piping and vessels?

Forced circulation of antifreeze through the water circuits is one method of avoiding freeze up.

Is the shutoff valve in the water supply line turned off?