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Protective system for hot tub water and power supply

  • US 4,663,613 A
  • Filed: 07/22/1985
  • Issued: 05/05/1987
  • Est. Priority Date: 07/22/1985
  • Status: Expired due to Term
First Claim
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1. In a method of supplying a tub 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, the improvement of urging a user of the tub to service said water circulation system upon clogging thereof, comprising in combination the steps of:

  • sensing in said circulation system water flow fluctuations occurring upon restriction of said water circulation system;

    precluding closure of said contactor for a time interval of predetermined duration in response to sensing of said water flow fluctuations; and

    making said predetermined duration sufficiently short for a resumption of said heater energization through reclosure of said contactor if said fluctuations are only transient, but sufficiently long to effect a reduction of water temperature in said tub supplied through said heater by restricting reclosure of said contactor as long as said fluctuations continue, to indicate to a user of said tub through said reduced water temperature a need to service said water circulation system.

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