US 11,885,532 B2
Efficient limit switch design and its location in a gas furnace
Lok Sudhir Katikala, Hyderabad (IN); and Ashalatha Kapa, Hyderabad (IN)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed on Dec. 22, 2020, as Appl. No. 17/130,843.
Claims priority of application No. 202011001832 (IN), filed on Jan. 15, 2020.
Prior Publication US 2021/0215395 A1, Jul. 15, 2021
Int. Cl. F24H 9/20 (2022.01); G05D 23/185 (2006.01); F24H 3/00 (2022.01); F24H 15/36 (2022.01); F24H 15/128 (2022.01); F24H 15/208 (2022.01)
CPC F24H 9/2085 (2013.01) [F24H 3/006 (2013.01); F24H 15/128 (2022.01); F24H 15/208 (2022.01); F24H 15/36 (2022.01); G05D 23/1852 (2013.01)] 13 Claims
OG exemplary drawing
 
9. A method for controlling a furnace, the method comprising:
operating a burner, the burner configured to receive and ignite a supply of combustible gas and produce a heated air, the heated air defining a temperature;
sensing, with a shape memory member, the temperature of the heated air, the shape memory member having a first fixed end and an opposite, second fixed end; and
actuating, with the shape memory member, a switch communicatively connected to a control board of the furnace, in response to the temperature being greater than a threshold, the switch being arranged within a plane containing the first fixed end and the second fixed end, wherein actuating the switch further comprises transforming the shape memory member from a retracted position to an extended position, and in the extended position, the shape memory member directly engages the switch.