Control method of gas furnace

Patent metadata

Field	Value
Publication number	US-11624504-B2
Application number	US-201916726368-A
Country	US
Kind code	B2
Filing date	Dec 24, 2019
Priority date	Dec 26, 2018
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

A method of controlling a gas furnace comprising a gas valve for supplying a fuel gas to a manifold; a burner through which the fuel gas discharged from the manifold passes; an igniter for igniting a mixture of fuel gas passed through the burner and air; and an inducer for generating a flow in which a combustion gas generated by the burning of the mixture is discharged to an exhaust pipe via a heat exchanger, wherein the gas furnace performs a heating operation according to a heating signal or a heating stop according to a stop signal, includes the steps of: (a) receiving any one of the heating signal or the stop signal; (b) transmitting a signal to operate the inducer when the heating signal is received; (c) operating the igniter; (d) transmitting a signal to open the gas valve; (e) detecting whether the gas valve is opened or closed; (f) detecting a flow rate of the fuel gas in the manifold; and (g) displaying a normal operation of the heating operation, based on information detected in the steps (e) and (f).

First claim

What is claimed is:

1. A method of controlling a gas furnace comprising a gas valve that supplies a fuel gas to a manifold; a burner through which the fuel gas discharged from the manifold passes; an igniter that ignites a mixture of fuel gas passed through the burner and air; and an inducer that generates a flow in which a combustion gas generated by the burning of the mixture is discharged to an exhaust pipe via a heat exchanger, wherein the gas furnace performs a heating operation according to a heating signal or a heating stop according to a stop signal, the method comprising:
receiving any one of the heating signal or the stop signal;
transmitting a signal to operate the inducer when the heating signal is received;
operating the igniter;
transmitting a signal to open the gas valve;
detecting whether the gas valve is opened or closed;
detecting a flow rate of the fuel gas in the manifold;
displaying a normal operation of the heating operation, based on information detected in the detecting of whether the gas valve is opened or closed and the detecting of the flow rate of the fuel gas in the manifold; and
stopping the heating operation by stopping the operation of the igniter, closing the gas valve, and maintaining the operation of the inducer, when at least one of the gas valve or the flow sensor is abnormal,
wherein the transmitting of the signal to open the gas valve comprises transmitting a signal so that the gas valve is opened in correspondence with a certain required thermal power of the gas furnace, and the method further comprises monitoring whether the flow rate of the fuel gas in the manifold corresponds to the signal transmitted, and
wherein the operation stop of the igniter is able to be released only when a check of the gas valve and the flow sensor is completed, if the at least one of the gas valve or the flow sensor is abnormal.

2. The method of claim 1 , wherein the detecting of the flow rate of the fuel gas in the manifold comprises detecting the flow rate of the fuel gas in the manifold using a flow sensor provided in the manifold.

3. The method of claim 2 , wherein the displaying of the normal operation of the heating operation comprises displaying the normal operation of the heating operation, when it is detected that the gas valve is opened, and when it is detected that the flow rate of the fuel gas in the manifold exceeds ‘0’.

4. The method of claim 3 , wherein the displaying of the normal operation of the heating operation further comprises displaying an abnormal operation of the flow sensor, when it is detected that the gas valve is opened, and when it is detected that the flow rate of the fuel gas in the manifold is ‘0’.

5. The method of claim 2 , wherein the displaying of the normal operation of the heating operation further comprises displaying an abnormal operation of the gas valve, when it is detected that the gas valve is closed, and when it is detected that the flow rate of the fuel gas in the manifold exceeds ‘0’.

6. The method of claim 5 , wherein the displaying of the normal operation of the heating operation further comprises displaying an abnormal operation of the gas valve and the flow sensor, when it is detected that the gas valve is closed, and when it is detected that the flow rate of the fuel gas in the manifold is ‘0’.

7. A method of controlling a gas furnace comprising a gas valve that supplies a fuel gas to a manifold; a burner through which the fuel gas discharged from the manifold passes; an igniter that ignites a mixture of fuel gas passed through the burner and air; and an inducer that generates a flow in which a combustion gas generated by the burning of the mixture is discharged to an exhaust pipe via a heat exchanger,
wherein the gas furnace performs a heating operation according to a heating signal or a heating stop according to a stop signal, the method comprising the steps of:
receiving any one of the heating signal or the stop signal;
transmitting a signal to operate the inducer when the heating signal is received;
operating the igniter;
transmitting a signal to open the gas valve;
detecting whether the gas valve is opened or closed;
detecting a flow rate of the fuel gas in the manifold;
displaying a normal operation of the heating operation, based on information detected in the detecting of whether the gas valve is opened or closed and the detecting of the flow rate of the fuel gas in the manifold, and
after the receiving of any one of the heating signal or the stop signal, the method further comprises:
stopping the operation of the igniter, when the stop signal is received;
transmitting a signal to close the gas valve;
detecting whether the gas valve is opened or closed;
detecting the flow rate of the fuel gas in the manifold; and
displaying a normal operation of the heating stop, based on information detected in the detecting of whether the gas valve is opened or closed and the detecting of the flow rate of the fuel gas in the manifold.

8. The method of claim 7 , wherein the detecting of the flow rate of the fuel gas in the manifold comprises detecting the flow rate of the fuel gas in the manifold using a flow sensor provided in the manifold.

9. The method of claim 8 , wherein the detecting of whether the gas valve is opened or closed comprises detecting that the gas valve is opened when an open state of the gas valve is continued for a certain time.

10. The method of claim 9 , wherein the displaying of the normal operation of the heating stop comprises displaying the normal operation of the heating stop, when it is detected that the gas valve is closed, and when it is detected that the flow rate of the fuel gas in the manifold is ‘0’.

11. The method of claim 10 , wherein the displaying of the normal operation of the heating stop further comprises displaying an abnormal operation of the gas valve or the flow sensor, when it is detected that the gas valve is closed, and when it is detected that the flow rate of the fuel gas in the manifold exceeds ‘0’.

12. The method of claim 9 , wherein the displaying of the normal operation of the heating stop further comprises displaying an abnormal operation of the gas valve, when the gas valve is detected to be opened.

13. The method of claim 11 , further comprising stopping the heating operation while operating the inducer, when at least one of the gas valve or the flow sensor is abnormal.

14. The method of claim 13 , wherein the operation stop of the igniter is able to be released only when a check of the gas valve and the flow sensor is completed, if at least one of the gas valve and the flow sensor is abnormal.

15. A method of controlling a gas furnace comprising a gas valve that supplies a fuel gas to a manifold; a burner through which the fuel gas discharged from the manifold passes; an igniter that ignites a mixture of fuel gas passed through the burner and air; and an inducer that generates a flow in which a combustion gas generated by the burning of the mixture is discharged to an exhaust pipe via a heat exchanger, wherein the gas furnace performs a heating operation according to a heating signal or a heating stop according to a stop signal, the method comprising:
receiving any one of the heating signal or the stop signal;
transmitting a signal to operate the inducer when the heating signal is received;
operating the igniter;
transmitting a signal to open the gas valve;
detecting whether the gas valve is opened or closed;
detecting a flow rate of the fuel gas in the manifold; and
displaying a normal operation of the heating operation, based on information detected in the detect

Assignees

• Lg Electronics Inc

Inventors

• Ha Doyong
• Jeong Yongki
• Park Janghee
• Kim Jusu
• PARK Hansaem

Classifications

• F23D14/02

  Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone · CPC title

• F24H9/1881

  using fluid fuel · CPC title

• F24H3/065

  using fluid fuel · CPC title

• F23N5/184 Primary

  using electronic means · CPC title

• F24H9/0073

  Arrangement or mounting of means for forcing the circulation of air · CPC title