Refrigeration – Automatic control – Time or program actuator
Patent
1989-07-18
1990-07-10
Tanner, Harry B.
Refrigeration
Automatic control
Time or program actuator
62126, 62230, 62231, 361 22, 361 29, F25B 4902, H02H 700
Patent
active
049399098
ABSTRACT:
An air-conditioner comprises a refrigerating circuit having a compressor, a condenser, an expansion device and an evaporator which are connected by suitable refrigerant conduits. An electric current path for making a current flow through the compressor includes an AC power source, to which a current transformer is coupled, and an output of the current transformer is converted into a DC voltage which is then given as a (+) input of a comparator. A reference voltage is given to a (-) input of the comparator. When the DC voltage exceeds the reference voltage of the comparator, the high level is outputted from the comparator. When the high-level output from the comparator persists for three seconds, the compressor is stopped forcedly and a three-minute timer is turned on. After a lapse of three minutes, the flow of the current through the current path of the compressor is resumed. Thereby, a lightly locked state is removed. If the output of the comparator still remains at the high level when the energizing is resumed, the compressor is put in the stopped state again. When such stopping and resuming of energizing of the compressor are repeated four times, the energizing of the compressor is stopped assuming that the compressor is in a heavily locked state.
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patent: 4722018 (1988-01-01), Pohl
Hosoya Masakazu
Tsuchiyama Yuji
Sanyo Electric Co,. Ltd.
Tanner Harry B.
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