Sump pump control system

Details Sump pump control system Sump pump control system

1978-06-22

1980-09-16

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 36, F04B 4900, F04B 4906

Patent

active

042227119

ABSTRACT:
An AC driven pump and a DC driven pump are positioned in a sump and respectively energized as the liquid in the sump reaches two different levels, the DC driven pump being automatically tested for operation after every predetermined number of pumping cycles of the AC driven pump.

REFERENCES:
patent: 3726606 (1973-04-01), Peters
patent: 3744932 (1973-07-01), Preuett
patent: 3941507 (1976-03-01), Niedermeyer
patent: 4061442 (1977-12-01), Clark
patent: 4087204 (1978-05-01), Niedermeyer
patent: 4095920 (1978-06-01), Needham

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