Burner control circuit

Details Burner control circuit Burner control circuit

1974-09-24

1977-04-26

Davis, Jr., Albert W.

Heat exchange

Movable heating or cooling surface

Rotary drum

165 27, 236 1C, 236 78D, F25B 2900

Patent

active

040195694

ABSTRACT:
A novel control circuit for heating and heating/cooling systems wherein in a heating mode the circuit controls a valve means comprising a main valve and a modulating valve through which gas is supplied to a burner. The main valve is a normally closed, solenoid-actuated type which opens when its coil is energized, and energization of its solenoid is controlled by a pair of normally open relay contacts connected in series. One of the contacts closes when the temperature in the space being heated drops below a preset temperature. The other contact remains closed so long as the temperature in the space being heated remains below a maximum limit. In a heating/cooling system the circuit is selectively operatively coupled with the valve means and a refrigeration unit. When heating is selected, the circuit operates as mentioned above. In cooling, a cooling solenoid of the refrigeration unit is energized when the temperature in the space being cooled rises above a preset temperature. A blower and blower control are also controlled such that the blower can operate either automatically whenever the refrigeration unit operates or continuously in either heating, cooling, or off. The circuit can be installed with a minimum number of wires connecting the temperature setting and sensing control unit with the control circuit module. A feedback circuit in the control circuit prevents the control circuit from pulsing the refrigeration unit when the desired temperature in the space being cooled is reached.

REFERENCES:
patent: 3292687 (1966-12-01), Evans
patent: 3486693 (1969-12-01), Stang, Jr. et al.
patent: 3499483 (1970-03-01), Schrader
patent: 3616846 (1971-11-01), Wills
patent: 3623545 (1971-11-01), Pinckaers

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