F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/21, 341/38.5
F23N 1/00 (2006.01) F23N 1/02 (2006.01) F23N 5/24 (2006.01) F24D 5/10 (2006.01)
Patent
CA 1270048
SELF-CORRECTING MICROPROCESSOR CONTROL SYSTEM AND METHOD FOR A FURNACE ABSTRACT OF THE DISCLOSURE A self-correcting control system and method is provided for a furnace to correct certain operating conditions that exceed normal limits. Upon sensing insufficient air flow as a function of the pressure drop across the heat exchangers, the control system and method cause the inducer motor to increase in speed, thereby to increase the flow of combustion air. Similarly, upon sensing that the flow of air to be heated exceeds a predetermined temperature, the control system and method will increase the speed of the air blower to increase the flow rate of air to be heated through the furnace, thereby resulting in lowering the temperature of the air to be heated below the predetermined temperature. Upon sensing a gas flow leak through the gas regulator, the control system and method will recycle the gas regulator to properly seat a gas flow control valve therein. If none of the self-correcting features correct the particular occurring problem, the control system and method will shut down the furnace.
521073
Carrier Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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