Heat pump wrong operational mode detector and control system

Details Heat pump wrong operational mode detector and control system Heat pump wrong operational mode detector and control system

1978-11-27

1980-07-08

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62160, 62126, 62131, F25B 1300, F25B 4100, F25B 4900

Patent

active

042110890

ABSTRACT:
An improper or wrong operational mode fault detection and control system for a reverse cycle refrigeration system for detecting faulty operation, i.e., operation in the cooling mode when heating is desired or in the heating mode when cooling is requested, and for controlling the system in response to the detection of a fault by inhibiting the compressor and for providing a fault indication, the control system comprising a controller means receiving inputs indicative of the outdoor air temperature, the temperature of the outdoor heat exchanger coil refrigerant, and an output indicative of a demand from a building temperature sensing means for heating or cooling of the building. The controller means also includes timing means and means for comparing the value of the outdoor heat exchanger coil refrigerant temperature and the value of the outdoor air temperature. Further, the controller means has an operative connection to control means for controlling the operation of the compressor and functioning to inhibit any further operation of the compressor means unless the value of the difference between the temperature of the outdoor heat exchanger refrigerant and the temperature of the outdoor air is less than a first preselected value when the thermostat requests heating, and unless said difference exceeds a second preselected value when the thermostat requests cooling.

REFERENCES:
patent: 2988896 (1961-06-01), Swart, Jr.
patent: 2988897 (1961-06-01), McGrath
patent: 3097502 (1963-07-01), Krueger
patent: 3170304 (1965-02-01), Hale

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