F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
230/51
F04B 27/02 (2006.01)
Patent
CA 1149789
19 47,635-I A B S T R A C T CONTROL SYSTEM FOR A MULTI-CAPACITY REFRIGERANT MOTOR-COMPRESSOR The invention relates to a control system for a multi-capacity refrigerant motor-compressor. The system comprises control means (74, 76, 82-82a, 84-84a, 80-80a, 92-92a,b) for effecting compressor operation in a low capacity mode in response to served- space sensed temperatures differing from a given served- space demand temperature up to a predetermined degree, and in a high capacity mode in response to served-space sensed temperatures differing from said demand temperature by more than said predetermined degree, and ambient tempera- ture responsive means (96,96a) preventing a shifting of the compressor operation from the high capacity mode to the low capacity mode in response to sensed ambient tem- peratures differing from the given demand temperature by more than a predetermined number of degrees. Preferably, the system includes timing means (80) for delaying re- starting of the compressor motor upon each change of capacity modes. The control system fairly matches the compressor capacity to prevailing demand and temperature conditions, and is particularly suitable for use with heat pumps.
363063
Oldham And Company
Westinghouse Electric Corporation
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