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Freeze Stat Control

HVAC Freeze Stat

The HVAC Freeze Stat is a limit control and it is used mainly in commercial systems in the duct work on economizers. It is a safety and protection control to prevent extremely cold air from reaching the hot water or chilled water coils inside the air handler where the air enters from the economizer. Under ideal control set up if the freeze stat trips the economizer dampers close and the blower fan stops. This prevents coils from freezing. A frozen coil can bust open and will need to be replaced if it freezes thus the purpose of the freeze stat in HVAC air handler applications which utilize economizers for free cooling.

There are some instances where HVAC maintenance departments have problems with nuisance trips on freeze stats and the HVAC maintenance department decides to jump this device out. This can cause severe damage to the equipment if the economizer feeds freezing air through the air handler. If the HVAC maintenance department experiences nuisance trips which cannot be adjusted through the range settings on the freeze stat device then the freeze stat should be replaced with a new freeze stat rather than jumping out the device. It would be better to disable the economizer than to jump out the freeze if a problems occurs.

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