Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1981-05-06
1983-03-15
Cline, William R.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
62129, G05D 2300
Patent
active
043765106
ABSTRACT:
The present invention relates generally to a warning device and method for a heating system. More particularly, the present invention relates to a warning device for a heat pump system which warning device generates a warning signal for indicating an abnormal condition in the heat pump system. The abnormal condition may be either activation of an auxiliary heater or malfunction or failure of a compressor for the heat pump system. The device comprises three temperature sensing thermistors. A first thermistor is attached to a line delivering working fluid from the compressor. The second thermistor is arranged inside a hot air duct delivering heated air from the system downstream from the auxiliary heater to a space to be heated. The third thermistor measures the ambient air temperature within the space to be heated. Temperatures sensed by the three thermistors are compared in a control circuit. During normal operation, the temperature of the working fluid is greater than or equal to the temperature of the hot air which is greater than or equal to the temperature of the ambient air. When the compressor unit fails, the temperature of the hot air (which is being heated by a separate source) is greater than the temperature of the working fluid by a predetermined value and the working fluid temperature is greater than or equal to the ambient air temperature. When this condition is sensed by the control unit, a warning device is activated to inform the user of a compressor failure.
REFERENCES:
patent: 3707851 (1973-01-01), McAshan
patent: 4211089 (1980-07-01), Mueller et al.
patent: 4246763 (1981-01-01), Mueller et al.
Cline William R.
McNally John F.
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