Pilot light control for an appliance

Patent metadata

Field	Value
Publication number	US-10670302-B2
Application number	US-201414225282-A
Country	US
Kind code	B2
Filing date	Mar 25, 2014
Priority date	Mar 25, 2014
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A device for igniting a pilot light for a heating appliance or for re-igniting the pilot. The device may monitor a thermopile at the pilot to determine if the pilot is lit and, if not, attempt to relight it. If the device fails to relight the pilot, it may continue attempting to relight the pilot until the stored energy is nearly depleted. Before the stored energy is depleted, the device may send a message indicating a failure to relight. The last of stored energy may alert a homeowner with an alarm that the appliance control has shut down and the pilot could not be relit. If the amount of energy stored drops below a specified threshold and the device successfully lights the pilot, it may restore the control to normal operation, and replenish the stored energy. The device may do a standing pilot or an intermittent pilot.

First claim

What is claimed is:

1. A pilot lighting system comprising:
a processor;
a pilot ignition circuit connected to the processor;
a communications circuit connected to the processor, the communications circuit operably coupled to a remote device via a wireless or wired connection and configured to transmit a message indicating an amount of hot water available in an appliance;
an energy storage circuit connected to the processor, the communications circuit and the pilot ignition circuit; and a source of energy connected to the energy storage circuit; and
wherein:
the source of energy comprises a thermo power source;
the thermo power source is proximate to a pilot and generates power when the pilot has a flame;
the communications circuit, energy storage circuit and the thermo power source are connectable to an appliance controller;
the appliance controller controls a fuel valve for the pilot;
the appliance controller is associated with the appliance; and
when the pilot is extinguished, then the fuel valve for the pilot is opened, the pilot is lit, and the pilot heats the thermo power source to provide energy to the energy storage circuit without a burn cycle being run if an energy level in the energy storage circuit is below a predetermined threshold level; and

wherein the communications circuit is further configured to transmit a plain English error message related to the pilot and a plain English recommended action for remedying the error message, wherein the processor is configured to determine if the pilot is lit and, if not, attempt to relight the pilot by sending a signal to the pilot ignition circuit to provide a spark at the pilot to ignite the pilot, and
wherein, after the attempt to relight the pilot fails and when the energy in the energy storage circuit is depleted to a first amount, then the communications circuit is configured to send a message to the remote device indicating a failure to relight.

2. The pilot lighting system of claim 1 , wherein the appliance is a hot water heater.

3. The pilot lighting system of claim 1 , wherein:
if the pilot has no flame, no power is generated by the thermo power source for the processor and the energy storage circuit;
power is provided from the energy storage circuit to the processor if sufficient energy is in the storage circuit for regular operation of the processor;
the processor can provide a signal to the appliance controller to open the fuel valve for the pilot; and
if the fuel valve for the pilot is opened, then the processor sends the signal to the pilot ignition circuit to provide the spark at the pilot to ignite the pilot.

4. The pilot lighting system of claim 3 , wherein:
the pilot ignition circuit provides the spark at the pilot every X seconds until the pilot lights up, or until Y seconds have passed after the spark has been first provided at the pilot if the pilot does not light up;
after the Y seconds have passed, then a voltage of the communications circuit or the thermo power source is checked; and
if the voltage of the communications circuit or the thermo power source is insufficient for regular operation, then relighting of the pilot begins and continues until the energy in the energy storage circuit is depleted to the first amount.

5. The pilot lighting system of claim 4 , when the energy in the energy storage circuit is depleted to the first amount, then the communications circuit is revived and sends the message indicating the failure to relight.

6. The pilot lighting system of claim 4 , wherein the first amount of energy in the energy storage circuit is used to sound an alarm to alert a person in an area of the appliance that the pilot is extinguished and cannot be relit.

7. The pilot lighting system of claim 3 , wherein when the burn cycle of the appliance is complete, then the fuel valve for the pilot is closed and the pilot is extinguished.

8. The pilot lighting system of claim 1 , wherein if the energy level in the energy storage circuit is equal to or greater than the predetermined threshold level and the water temperature is below a predetermined temperature, then the burn cycle operates and the thermo power source provides energy to the energy storage circuit.

9. The pilot lighting system of claim 1 , wherein the source of energy further comprises one or more items selected from a group consisting of thermopiles, solar panels, wind generators, rechargeable batteries, and energy harvesting systems.

10. The pilot lighting system of claim 1 , wherein the communications circuit and the thermo power source are connectable to one or more additional appliance controllers.

11. The pilot lighting system of claim 1 , wherein:
the ignition circuit comprises a standing pilot mode or an intermittent pilot mode; and
a pilot mode is selectable from the remote device.

12. A pilot lighting system comprising:
a processor;
a communications circuit coupled to a remote device via a wireless or wired connection, the communications circuit connected to the processor;
a pilot ignition circuit connected to the processor;
an energy source; and
an energy storage circuit connected to the energy source, the processor, the communications circuit and the pilot ignition circuit; and
wherein:
the energy source is proximate to a pilot and generates power if the pilot has a flame;
the communications circuit and the energy source are connectable to an appliance controller;
the appliance controller and pilot are associated with an appliance; and
when the pilot is extinguished, then the fuel valve for the pilot is opened, the pilot is lit and the pilot heats the thermo power source to provide energy to the energy storage circuit without a burn cycle being run if an energy level in the energy storage circuit is below a predetermined threshold level;
the communications circuit is configured to transmit a message to the remote device indicating an amount of hot water available in the appliance, the communications circuit is further configured to transmit an alphanumeric error message in plain English related to the pilot and an alphanumeric recommended action in plain English for the error message;
the processor is configured to determine if the pilot is lit and, if not, attempt to relight the pilot by sending a signal to the pilot ignition circuit to provide a spark at the pilot to ignite the pilot; and
after the attempt to relight the pilot fails and when the energy in the energy storage circuit is depleted to a first amount, then the communications circuit is configured to send a message to the remote device indicating a failure to relight.

13. The pilot lighting system of claim 12 , wherein the processor can provide a signal to the appliance controller to open a fuel valve for the pilot and eventually, if the pilot is ignited by the pilot ignition circuit, a fuel valve for a main heater of the appliance is opened.

14. The pilot lighting system of claim 13 , wherein:
the pilot ignition circuit provides the spark at the pilot periodically until the pilot lights up, or until after a predetermined amount of time; and
if the voltage of the communications circuit or the energy source is insufficient for regular operation, then relighting of the pilot begins and continues until the energy in the energy storage circuit is depleted to the first amount.

15. The pilot lighting system of claim 14 , wherein:
when the burn cycle of the main heater is run and complete, then the fuel valve for the pilot is closed and the pilot is extinguished;
when the pilot is extinguished, then the fuel valve for the pilot is opened, the pilot is lit and t

Assignees

• Ademco Inc

Inventors

• Hazzard Frederick
• Heil David
• Khosla Ravindra

Classifications

• F23N2227/30

  for pilot burners · CPC title

• F24H1/186

  using fluid fuel · CPC title

• F23N2241/04

  Heating water · CPC title

• F24H9/2035 Primary

  using fluid fuel · CPC title

• F23N5/242

  using electronic means · CPC title