Primary gas furnace control

Details Primary gas furnace control Primary gas furnace control

1989-03-30

1990-04-10

Green, Randall L.

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 46, 431 60, 431 74, 431 78, F23Q 2300

Patent

active

049156144

ABSTRACT:
A primary gas furnace control including a thermostatically controlled intermittent ignition system, the control being effective to monitor and control main gas valve action through use of flame rectification. The control features a slight delay on main valve dropout with flame failure and an extension of the ignition source into the main burner cycle to prevent nuisance recycling. If desired, the control may also include time pilot valve, thermostat resettable, lockout as well as prepurge capability for use in applications requiring a furnace combustion chamber purge prior to an ignition cycle.

REFERENCES:
patent: 3766441 (1973-10-01), Gray
patent: 4070143 (1978-01-01), Dietz
patent: 4269589 (1981-05-01), Matthews
patent: 4435150 (1984-03-01), Rippelmeyer
patent: 4626192 (1986-12-01), Geary
patent: 4680005 (1987-07-01), Geary

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