G - Physics – 08 – B
Patent
G - Physics
08
B
309/32
G08B 13/18 (2006.01) E04H 4/12 (2006.01)
Patent
CA 1253186
PROTECTIVE SYSTEM FOR HOT TUB WATER AND POWER SUPPLY A B S T R A C T 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.
506223
Keegan Patrick J.
Raleigh William F.
Gowling Lafleur Henderson Llp
Teledyne Industries Inc.
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