Freeze Protection Kit for Evaporator coil FSK01A
The Goodman/Daikin FSK01A Freeze Thermostat kit is a line thermostat which installs on one of the feeders to the suction manifold for the indoor "evaporator" coil. The 24V cooling lead from the room thermostat to the outdoor unit must run through the line thermostat. If an operating condition is reached in which the indoor "evaporator coil is about to freeze up, then the line thermostat will disconnect the cooling signal to the outdoor unit and prevent the indoor coil from freezing and shut down air handler. Two operating conditions which may cause freeze up are 1) An extremely dirty return air filter 2) loss of the indoor blower motor.
In low ambient situations this kit is recommended by the manufacturer be installed in conjunction with a low ambient kit to prevent the freezing up of the outdoor coil "condenser coil" and with the FSK01A the indoor coil as well.