Patent ID: 6212894
Filing Date: 2001-04-10
Classification: F24D,F25B

Abstract:
An electronic control system for controlling a heat pump water heater including a compressor which includes a suction side, an evaporator, refrigerant for circulating through said evaporator, and a condenser coupled with a hot water retention tank to form a hot water circuit, the hot water retention tank including means for receiving water from a supply source and means for discharging heated water, said control system comprising: first means for sensing the temperature of water in the hot water circuit and generating a first output signal representative of such temperature; second means for sensing the temperature of the hot water at the discharge means of the hot water retention tank and generating a second output signal representative of such temperature; means for circulating water from the hot water retention tank, through the condenser and back to the hot water retention tank; and a controller for receiving said first and second output signals, whereby upon detecting a rise in the temperature of hot water at said discharge means said controller energizes said circulating means, samples said first output signal and cycles the heat pump water heater to maintain a predefined hot water setpoint.