How do you reset the freeze stat on an air handler?
Freezestat trips are usually hard-wired into the air-handling unit controls to stop the unit fans and open the Hot Water valve to full open or some minimum % open. Freezestats are designed to be reset manually by someone physically pushing the button back in on the control box.
What is a free stat HVAC?
A freeze stat is a temperature sensing device for HVAC that monitors a heat exchanger to prevent its coils from freezing.
What causes a freeze stat to trip?
The freeze stat will trip if the capillary tube senses air at, or below, this temperature. Sometimes maintenance personnel increase the setpoint thinking that “warmer” is better, when in reality they are increasing the range in which the freeze stat will trip.
What is a freeze stat switch?
WHAT IS IT? The freeze stat is a safety switch that is used in almost all commercial and industrial air-handling units, cabinet unit heaters, unit ventilators, and blower units that have chilled water and/or hot water coils.
Where do I put freeze stats?
Freezestats should be installed on the downstream side of the heating coil. This assumes that you have a heating coil or that you heating coil is in the pre-heat position (i.e. before the cooling coil as seen by the flow of outside air).
Where do I mount freeze stats?
They should be mounted between the heating and cooling coils on the supply side of the fan unit and respond to the lowest temperature sensed along any one foot section of the sensing element.
What is Frostat trip?
The FROSTAT”” system allows the operating envelope. ambient temperatures to be 10 F lower than with a hot. gas bypass system.
Does a DX coil need freeze stat?
A freezestat is a safety device that protects a water coil from freezing (DX coils do not require them).
Where is a Freezestat located?
Normally the freeze stat goes on the leaving face of the heating coil set at 38F. Sometimes with a hot water coil there will be a small freeze protection pump as part of the piping system to rat race water around at the coil to keep it from freezing in the event of a heating plant failure. That is another option.