Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1998-01-25
2000-06-27
Kwon, John
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 32, F04B 4900
Patent
active
060799501
ABSTRACT:
A control system is disclosed for a swimming pool or a spa recirculating system. Water is withdrawn from a pool or spa by a pump and supplied, through a filter, back to the pool. As is common with such systems, a controller is operated to initiate operation of the pump at pre-established time intervals (for example, once every twenty-four hours). The length of time or duty cycle that the pump is operated at each of these time intervals is determined by a temperature sensor which senses the water temperature. The temperature sensor supplies a signal to the controller to cause the pump to be operated for a longer period of time when the water temperature is above a threshold temperature, and to be operated for a shorter period of time when the water temperature is below the predetermined threshold.
REFERENCES:
patent: 4421643 (1983-12-01), Frederick
patent: 4505643 (1985-03-01), Millis et al.
patent: 4676914 (1987-06-01), Mills
patent: 4750472 (1988-06-01), Frzekas
patent: 4945942 (1990-08-01), Lund
Kwon John
Ptak LaValle D.
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