Integrated furnace control and control self test

An integrated control for a gas-fired furnace system of the type having at least a relay controlled main gas valve, an inlet gas pressure sensor, an inducer fan for forcing air through a combustion chamber in the furnace, means for sensing inducer fan forced air flow through the combustion chamber, a blower fan for circulating air through the furnace, a thermostat for providing a comfort setting signal to the control, a hot air temperature sensor for controlling the blower fan, and means operable in response to inputs from said sensors and sensing means and said thermostat to control said valve so as to operate said furnace in a safe manner, the integrated control comprising:

• first means for sequentially testing a plurality of the above recited furnace components prior to an attempt to ignite the furnace, second means for sequentially testing said plurality of furnace components during furnace operation, and manually operable means for sequentially testing said plurality of furnace components at times other than prior to an attempt to ignite the furnace and during furnace operation.

An integrated burner control system for a furnace system of the type having at least a relay controlled main gas valve, an inducer fan for forming air through a combustion chamber in the furnace, means for sensing inducer fan forced air flow through the combustion chamber, a blower fan for circulating air through the furnace, a thermostat for providing a comfort setting signal to the control, means for controlling the blower fan, and means operable in response to inputs from said sensing means and said thermostat to control said valve so as to operate said furnace in a safe manner, the integrated control comprising:

• first, second and third means, respectively operable in three different modes to test a plurality of the above recited furnace components, respectively, prior to an attempt to ignite the furnace, during furnace operation and at times other than prior to an attempt to ignite the furnace and other than during furnace operation, and
• means responsive to any one of the said first, second and third means for selectively providing a visible indication if all tested components are operating in a satisfactory manner and any one of a plurality of faulty component indicative indications in the event a tested component failed the test.