Protective system for hot tub water and power supply

Details Protective system for hot tub water and power supply Protective system for hot tub water and power supply

1985-07-22

1987-05-05

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340407, 210 97, 210181, 4544, 4545, G08B 2100

Patent

active

046636137

ABSTRACT:
A tub is supplied with hot water through a water circulation system including a pump, a water filter and an electric flow-through heater energized through an electric contactor upon closure thereof. A user of the tub is urged to service the water circulation system upon clogging thereof. For this purpose, water flow fluctuations occurring in the circulation system upon restriction of the water circulation system are sensed and closure of the contactor is precluded for a time interval of predetermined duration in response to a sensing of water flow fluctuations. That predetermined duration is made sufficiently short for a resumption of the heater energization through reclosure of the contactor if the fluctuations are only transient, but sufficiently long to effect the reduction of water temperature in the tub supplied through the heater by restricting reclosure of the contactor as long as the fluctuations continue, so as to indicate to the user of the tub through the reduced water temperature a need to service the water circulation system.

REFERENCES:
patent: 4153003 (1979-05-01), Willis
patent: 4385724 (1983-05-01), Ramsauer et al.
patent: 4500874 (1985-02-01), Jacobi et al.
patent: 4545906 (1985-10-01), Frederick

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