F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
F25B 49/02 (2006.01) F25B 13/00 (2006.01) G05D 23/19 (2006.01)
Patent
CA 2048249
METHOD FOR DETECTING AND CORRECTING REVERSING VALVE FAILURES IN HEAT PUMP SYSTEMS HAVING A VARIABLE SPEED COMPRESSOR ABSTRACT OF THE DISCLOSURE Temperatures in the inside heat exchanger or both the inside and outside heat exchangers of a reversible vapor compres- sion refrigeration system are sensed before and after a system startup or mode change. If the reversing valve is positioned properly, the temperatures should change in a certain way because of the operating change, e.g., on a startup in cooling mode, the inside heat exchanger tempera- ture should decrease. If the temperatures actually sensed do not change in the predicted way, it is an indication that the reversing valve is incorrectly positioned for the operating mode selected. If the temperature changes indi- cate that the reversing valve is out of position, the variable speed compressor is operated at its maximum speed for a short time. If the temperature change is now as expected, the valve has changed to the proper position. If the temperatures still have not changed in the way predict- ed, the reversing valve is still improperly positioned. This indicates a malfunctioning valve and the system is shut down.
Carrier Corporation
Gowling Lafleur Henderson Llp
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