Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1983-03-18
1985-03-19
Look, Edward K.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
210138, 210169, 2104162, 417 33, 417 44, F04B 4900
Patent
active
045056439
ABSTRACT:
A circulating pump (B) pumps water between a swimming pool or other reservoir (A) and a filter or other circulated fluid receiving apparatus (C). A control circuit (D) intermittently operates the circulating pump. The operating circuit includes a first timer (32) and a cycle switch (34) which is cyclically closed to produce a pump signal for a first duration with a first periodicity. The pump signal starts a second timer (54) of a time controlled switch (52). The second timer holds the time controlled switch conductive for a preselected time period. The pump signal is conducted through a bypass switch (64), and the time actuated switch. When the pressure monitored by a pressure sensor (20) exceeds a preselected pressure, a low pressure switch (62) closes conducting the pump signal around the bypass and time controlled switches. A high pressure shutoff switch (66) conducts the pump signal to a power relay coil (72) unless a preselected high pressure is monitored. The power relay coil controls relay contacts (74) through which electric power is supplied to a pump motor (40 ).
REFERENCES:
patent: 2981195 (1961-04-01), Payne et al.
patent: 3867290 (1975-02-01), Mackey
patent: 3963375 (1976-06-01), Curtis
patent: 4180374 (1979-12-01), Bristow
patent: 4224154 (1980-09-01), Steininger
patent: 4239457 (1980-12-01), Langford
patent: 4329120 (1982-05-01), Walters
patent: 4330238 (1982-05-01), Hoffman
patent: 4421643 (1983-12-01), Frederick
Grys Rodger J.
Millis Donald E.
Look Edward K.
North Coast Systems, Inc.
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