Control system for an intermittent pilot water heater

Patent metadata

Field	Value
Publication number	US-11739982-B2
Application number	US-202016993173-A
Country	US
Kind code	B2
Filing date	Aug 13, 2020
Priority date	Aug 14, 2019
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A water heater control system comprising an energy storage system electrically connected to a pilot valve operator and electrically isolated from a main valve operator. The energy storage system may be electrically connected to an ignition circuit. A thermoelectric device is in thermal communication with the pilot flame and electrically connected to a main valve operator. The water heater system may include a microcontroller configured to establish electrical communications between the device and the energy storage system, the pilot valve operator, and the main valve operator. The microcontroller may be configured to recognize a call for main burner operation, and may also be configured to check an available voltage of the energy storage system against a setpoint. The microcontroller may establish pilot flame operation with or without main burner operation, depending on whether a call for heat or recharging of the energy storage system is required.

First claim

What is claimed is:

1. A water heater comprising:
a pilot ignition circuit configured to cause a pilot spark ignitor to generate a flame using a first amount of gas flow and a first burner;
a thermoelectric device that converts thermal energy from the flame into electrical energy to power components of the water heater;
a converter circuit configured to generate voltage and current from the electrical energy generated by the thermoelectric device;
an energy storage system,
wherein the energy storage system comprises at least one of a rechargeable storage system or a non-rechargeable storage system,
wherein the rechargeable storage system is configured to store some portion of the electrical energy generated by the thermoelectric device;

a first valve operator coupled to receive an amount of the electrical energy generated by the thermoelectric device when the thermoelectric device is generating the electrical energy and coupled to receive a current from the energy storage system when the thermoelectric device is not generating the electrical energy,
wherein the first valve operator controls whether there is the first amount of gas flow to the first burner; and

a second valve operator coupled to receive a quantity of the electrical energy generated by the thermoelectric device,
wherein the second valve operator controls whether there is a second amount of gas flow to a second burner,
wherein the second amount of gas flow is greater than the first amount of gas flow,
wherein the quantity of the electrical energy generated by the thermoelectric device is sufficient to activate the second valve operator,
wherein the second valve operator is prevented from receiving a quantity of electrical energy from the energy storage system sufficient to activate the second valve operator.

2. The water heater of claim 1 , wherein the second burner is configured to place the second amount of gas flow in thermal communication with the flame generated by the pilot spark ignitor.

3. The water heater of claim 1 , wherein the thermal energy from the flame is the sole source of energy available to generate the some portion of the electrical energy stored by the energy storage system.

4. The water heater of claim 1 , wherein the pilot spark ignitor is in thermal communication with the first amount of gas flow.

5. The water heater of claim 1 , further comprising a microcontroller wherein:
the microcontroller is configured to establish electrical contact between the energy storage system and the first valve operator;
the microcontroller is configured to establish electrical contact between the thermoelectric device and the second valve operator; and
the microcontroller is configured to:
receive a signal indicative of a temperature;
establish, in response to the signal indicative of the temperature, electrical contact between the energy storage system and the first valve operator; and
initiate, in response to the signal indicative of the temperature, electrical contact between the thermoelectric device and the second valve operator.

6. The water heater of claim 5 , further comprising:
a first electronic device configured to establish electrical contact between the energy storage system and the first valve operator; and
a second electronic device configured to establish electrical contact between the thermoelectric device and the second valve operator,
wherein the microcontroller is configured to utilize the first electronic device to establish electrical contact between the energy storage system and the first valve operator in response to the signal indicative of the temperature, and
wherein the microcontroller is configured to utilize the second electronic device to initiate electrical contact between the thermoelectric device and the second valve operator in response to the signal indicative of the temperature.

7. The water heater of claim 5 , wherein the microcontroller is configured to prompt the pilot ignition circuit to cause the pilot spark ignitor to generate the flame when the microcontroller receives the signal indicative of the temperature.

8. The water heater of claim 5 , wherein the microcontroller is configured to receive electrical power from at least one of the converter circuit or the energy storage system.

9. The water heater of claim 5 , further comprising a temperature sensing device in thermal communication with a volume of water, wherein the temperature sensing device is configured to provide the signal indicative of the temperature to the microcontroller.

10. The water heater of claim 5 , wherein:
the microcontroller is configured to prompt the pilot ignition circuit to cause the pilot spark ignitor to generate the flame; and
the microcontroller is configured to:
determine an available voltage level in the energy storage system;
determine whether the energy storage system requires additional charge based on the available voltage level;
establish, based on the energy system requiring additional charge, electrical contact between the energy storage system and the first valve operator; and
prompt, based on the energy storage system requiring additional charge, the pilot ignition circuit to cause the pilot spark ignitor to generate the flame.

11. The water heater of claim 1 , wherein the first valve operator is an actuator for a first servo valve and the first servo valve is configured to cause a pilot valve to initiate the first gas flow, and wherein the second valve operator is an actuator for a second servo valve and the second servo valve is configured to cause a main fuel valve to initiate the second gas flow.

12. The water heater of claim 1 , wherein the converter circuit is configured to provide the some portion of the electrical energy generated by the thermoelectric device to the energy storage system and configured to provide the amount of the electrical energy generated by the thermoelectric device to the first valve operator.

13. The water heater of claim 1 , wherein the converter circuit is configured to provide the quantity of the electrical energy generated by the thermoelectric device to the second valve operator.

14. A water heater system comprising:
a first valve operator,
wherein the first valve operator initiates a first gas flow when energized;

an energy storage system coupled to energize the first valve operator;
a pilot ignition circuit configured to cause a pilot spark ignitor to generate a pilot flame using the first gas flow;
a second valve operator,
wherein the second valve operator initiates a second gas flow when energized,
wherein the second gas flow is greater than the first gas flow, and
wherein the second valve operator cannot be energized from the energy storage system; and

a thermoelectric device that converts thermal energy from the pilot flame into electrical energy, the thermoelectric device coupled to provide a first portion of the electrical energy to energize the second valve operator and the thermoelectric device coupled to provide a second portion of the electrical energy to the energy storage system.

15. The water heater system of claim 14 , further comprising a burner configured to establish thermal communication between the second gas flow and the pilot flame to generate a main burner flame.

16. The water heater system of claim 14 , further comprising a microcontroller wherein:
the microcontroller is configured to establish electrical contact between the energy storage system and the first valve operator;
the microcontroller is configured to establish electrical contact between the thermoelectric devi

Assignees

• Ademco Inc

Inventors

• Hazzard Frederick
• Young Gregory
• Myre Adam
• Anderson Peter M
• Strand Rolf L
• Mitchell John D

Classifications

• F24H9/2035 Primary

  using fluid fuel · CPC title

• F24H15/31

  of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves · CPC title

• F24H15/407

  using electrical switching, e.g. TRIAC · CPC title

• F24H15/223

  in the water storage tank · CPC title

• F24H15/36

  of burners · CPC title