F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
62/25
F25B 13/00 (2006.01)
Patent
CA 1122806
COMPRESSOR HEAT PUMP SYSTEM WITH MAXIMUM AND MINIMUM EVAPORATOR .DELTA.T CONTROL ABSTRACT An air source heat pump system incorporating a refrigerant charged bulb 70 within the air flow 22 passing over the outdoor coil of a heat pump system to sense out- side ambient air temperature. The refrigerant charged bulb supplies a variable saturated pressure which acts upon a bellows 62 of a control unit 58 whose opposite side is subjected via a second bellows 64 to saturated suction pressure corresponding to refrigerant evaporating temper- ature of the refrigerant returning from the outdoor coil 10 to tile inlet 30 of the compressor 12. The bellows provides a spring load. An electrical switching device 76,74 responsive to this pressure differential acts to first block unnecessary loading of the compressor and secondly to initiate unloading of the compressor. Additional switching means 84,86 prevents excessive unloading of the compressor 12 and insures subsequent initiation of loading to prevent liquid logging of the evaporator coil 10.
354431
Dunham-Bush Inc.
Meredith & Finlayson
LandOfFree
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