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Class Information
Number: 236/11
Name: Automatic temperature and humidity regulation > Hot-air furnace > Air and fire control
Description: Subject matter in which the fire and also the flow of the heating air through the air chamber of the furnace is controlled.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8573504 Furnace Nov. 5, 2013
8471511 Brushless motor control device and brushless motor Jun. 25, 2013
8275484 Stepper motor gas valve and method of control Sep. 25, 2012
8235707 Multi-boiler and control method thereof for preventing back flow of exhaust gas Aug. 7, 2012
8123518 Burner firing rate determination for modulating furnace Feb. 28, 2012
8074892 Appliance control with automatic damper detection Dec. 13, 2011
7913927 Fuel economizer Mar. 29, 2011
7905722 Control of an adjustable secondary air controller for a burner Mar. 15, 2011
7861707 Gravity feed natural draft pellet stove Jan. 4, 2011
7735743 Apparatus and methods for variable furnace control Jun. 15, 2010
7731096 Controller for two-stage heat source usable with single and two stage thermostats Jun. 8, 2010
7721972 Appliance control with automatic damper detection May. 25, 2010
7651034 Appliance room controller Jan. 26, 2010
7455238 Control system and method for multistage air conditioning system Nov. 25, 2008
7322532 Hot-water supply apparatus, anti-freezing method thereof, and anti-freezing program thereof Jan. 29, 2008
7296426 Interactive control system for an HVAC system Nov. 20, 2007
7293718 Variable output heating and cooling control Nov. 13, 2007
7225995 Space heating and cooling Jun. 5, 2007
7191826 Variable speed fan motor control for forced air heating/cooling system Mar. 20, 2007
7104460 Method and controller for determining carbon dioxide emissions from a recirculating air heater Sep. 12, 2006
7048537 Apparatus and method for controlling a variable fuel fired appliance May. 23, 2006
6986469 Method and apparatus for energy recovery in an environmental control system Jan. 17, 2006
6925999 Multistage warm air furnace with single stage thermostat and return air sensor and method of operating same Aug. 9, 2005
6866202 Variable output heating and cooling control Mar. 15, 2005
6860430 Space heating and cooling Mar. 1, 2005
6848623 Method and apparatus for centrally controlling environmental characteristics of multiple air systems Feb. 1, 2005
6758208 Flexible gas-fired heat exchanger system Jul. 6, 2004
6719207 Microprocessor controlled two stage furnace Apr. 13, 2004
6695046 Variable speed fan motor control for forced air heating/cooling system Feb. 24, 2004
6684944 Variable speed fan motor control for forced air heating/cooling system Feb. 3, 2004
6439466 Climate control system Aug. 27, 2002
6431457 Air heater control Aug. 13, 2002
6321744 Modulating furnace having a low stage with an improved fuel utilization efficiency Nov. 27, 2001
6308702 Compact high-efficiency air heater Oct. 30, 2001
6283115 Modulating furnace having improved low stage characteristics Sep. 4, 2001
6244515 Universal two stage gas furnace ignition control apparatus and method Jun. 12, 2001
6230979 Controller for two-stage heat source, usable with single and two stage thermostats May. 15, 2001
6206084 Circuit arrangement for actuating an air-conditioning system or automatic air conditioner in a vehicle Mar. 27, 2001
6161535 Method and apparatus for preventing cold spot corrosion in induced-draft gas-fired furnaces Dec. 19, 2000
6089221 Space heater Jul. 18, 2000
6070660 Variable speed fan motor control for forced air heating/cooling system Jun. 6, 2000
6062482 Method and apparatus for energy recovery in an environmental control system May. 16, 2000
6000622 Automatic control of air delivery in forced air furnaces Dec. 14, 1999
5984003 System and method for controlling operation of a multi-speed circulation blower in a heating and cooling apparatus Nov. 16, 1999
5971284 Apparatus for regulating heater cycles to improve forced-air heating system efficiency Oct. 26, 1999
5860473 Multi-zone automatic changeover heating, cooling and ventilating control system Jan. 19, 1999
5829261 Driving arrangement for air refrigeration appliances Nov. 3, 1998
5819845 Temperature control method for a heating/cooling system Oct. 13, 1998
5806760 Furnace controller useable, without modification, with either a single or two stage thermostat Sep. 15, 1998
5718372 Temperature controller Feb. 17, 1998

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