Welded contact safety technique

Details Welded contact safety technique Welded contact safety technique

F - Mech Eng,Light,Heat,Weapons

25

B

341/28

F25B 49/00 (2006.01) F25B 13/00 (2006.01) G05D 23/19 (2006.01) H01H 3/00 (2006.01)

Patent

CA 1281394

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.

543719

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