Combustion – Timer – programmer – retarder or condition responsive control – Of or by exhaust damper or exhaust pump
Patent
1988-03-03
1989-08-15
Focarino, Margaret A.
Combustion
Timer, programmer, retarder or condition responsive control
Of or by exhaust damper or exhaust pump
431 89, 126361, 122 13R, F23N 300
Patent
active
048569828
ABSTRACT:
The present invention includes an exhaust fan for exhausting combustion gases from a gas fired water heater, a gas pressure diaphragm switch for operating the exhaust fan in response to fuel flowing to the burner of the water heater, and a safety device for preventing fuel flow to the burner upon detecting undesirable changes in combustion gases. The apparatus further includes a time delay to continue operation of the exhaust fan and exhaust residual combustion gases for a short time after fuel flow to the burner has ceased. In one form the time delay is a time delay relay switch and in another form it is a flow restricting orifice that restricts the flow of fuel from the gas pressure diaphragm switch, thereby maintaining a closed circuit to the exhaust fan.
REFERENCES:
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patent: 2714644 (1955-08-01), Harrison
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patent: 3494551 (1970-02-01), Snider
patent: 3801258 (1974-04-01), Mutchler
patent: 4437824 (1984-03-01), Baker
patent: 4468192 (1984-08-01), Jaeger
patent: 4672919 (1987-06-01), Staats
Focarino Margaret A.
Tjernlund Products, Inc.
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