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Freeze stat
A freeze stat is a temperature sensing device for HVAC that monitors a heat exchanger to prevent its coils from freezing. Freeze stats can be used on both freon-to-air, and freon-to-liquid type heat exchangers and serve different purposes with similar goals for each.
== Air coil ==
The purpose of an air coil freeze stat is to keep the refrigerant-to-air heat exchanger (commonly called ''air coils'') from freezing. This kind of freeze stat is typically used for heating coils which are exposed to outside air and is usually installed on the supply air side of the coil.〔(http://www.tradelineinc.com/glossary/E1A3F82F-5E0F-4EB0-A90459BE3DF50AD5 )〕 To accomplish this, they typically shut down the flow of outside air to a mixing box when the temperature reaches a predetermined setpoint. The setpoint for air coil freeze stats is typically about 38 degrees Fahrenheit which is approximately when the dew point temperature of the air starts to drop below freezing point.〔(The Freeze Stat ) John Williams Jr., Carrier Corporation, ''The Air Conditioning, Heating, Refrigeration News'', July 2001〕〔(Freeze Protection Problems )
〕〔(EPA Ventalation Checklist )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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