Patent ID: 6038872
Filing Date: 2000-03-21
Classification: F25D

Abstract:
A frost detecting device, comprising: a frost detector including a detecting thermal sensitive element and a compensating thermal sensitive element, the thermal sensitive element and the compensating thermal sensitive element being disposed in a heat conducting metal housing, the housing being partitioned to separate the interior into first and second chambers, the first chamber housing the thermal sensitive element and the second chamber housing the compensating thermal sensitive element, the first chamber being formed with slits which are adapted so that cold air flow thereinto and can be blocked by the formation of frost;an amplifier circuit for amplifying an output signal from the frost detector;a comparator circuit for comparing an output voltage from the amplifier circuit with a set voltage from a voltage setting circuit;an operation detecting circuit for detecting operating conditions of a compressor and a cooling fan; anda judging circuit for detecting existence of frost in accordance with output voltages from the operation detecting circuit and the comparator circuit.