Welded contact safety technique

Details Welded contact safety technique Welded contact safety technique

1986-08-26

1987-10-13

Tanner, Harry B.

Refrigeration

Automatic control

Selective heating or cooling

62126, F25B 1300

Patent

active

046989781

ABSTRACT:
A bidirectional heat transfer system including a reversing valve and a compressor has a compressor control which is subject to a welded contact failure. The system is monitored to determine when the control system has signaled for the compressor operation to stop but the compressor has, in fact, continued to operate. Under these circumstances, a safety mode of operation is commenced to keep a load on the compressor to thereby save the compressor from self-destruction. Preferably, this is done by repetitively reversing the state of the reversing valve.

REFERENCES:
patent: 4211089 (1980-07-01), Mueller et al.
patent: 4246763 (1981-01-01), Mueller et al.
patent: 4307775 (1981-12-01), Saunders et al.
patent: 4381549 (1983-04-01), Stamp, Jr. et al.

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