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Control circuitry for water level control of pools

  • US 4,380,091 A
  • Filed: 12/05/1980
  • Issued: 04/19/1983
  • Est. Priority Date: 11/13/1978
  • Status: Expired due to Term
First Claim
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1. A system for controlling the level of water in a swimming pool, said system being adapted to control a fill valve to add water to the pool as required, and comprising, in combination:

  • first water level sensing means positioned in said pool for producing a first output signal indicative of the presence or absence of water at a predetermined latch level within the pool;

    second water level sensing means positioned in said pool for producing a second output signal indicative of the presence or absence of water at a predetermined normal level within the pool above said latch level;

    control circuit means for opening said fill valve in response to said output signal from said first water level sensing means indicating said water level falling below said latch level, and for closing said fill valve in response to said output signal from said second water level sensing means indicating said water level rising to said normal level; and

    monitor circuit means responsive to said first and second output signals for disabling operation of said fill valve upon the occurrence of sensing water at said normal level without also sensing water at said latch level.

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