Combustion – Timer – programmer – retarder or condition responsive control – With test circuit checking or analyzing flame sensing...
Patent
1990-10-10
1991-12-31
Price, Carl D.
Combustion
Timer, programmer, retarder or condition responsive control
With test circuit checking or analyzing flame sensing...
431 18, F23N 500, F23N 524
Patent
active
050767801
ABSTRACT:
A digital control system, for a gas-fired, forced combustion air heating appliance, controls operation of a combustion air blower and a gas valve as a function of essentially square wave input signals derived from a thermostat, a combustion air proving sensor switch, and a gas valve control relay. When a first input signal from the thermostat demands heat, the control system first checks for the presence of a second input signal (which indicates the status of the combustion air sensor switch) before starting the combustion air blower. If the second input signal indicates that combustion air is being delivered before the combustion air blower has started, the control system immediately halts the ignition sequence. If the combustion air sensor switch is functioning properly, the ignition sequence continues and the control system checks a third input signal to determine the status of the contacts of the gas valve relay. If the third input signal indicates that the relay contacts which power the gas valve are already closed before the gas valve relay coil is energized, the control system halts the ignition sequence by turning off the combustion air blower, causing the combustion air sensor switch to open and shut off power to the gas valve.
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Honeywell Inc.
Price Carl D.
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