Water heater leak detection system

Patent metadata

Field	Value
Publication number	US-9799201-B2
Application number	US-201615061520-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Mar 5, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

The disclosure reveals a system for detecting moisture or water in a particular location. The system may incorporate a moisture detector having a control module connected to an appliance, a moisture detection circuit connected to the control module, and a voltage source connected to the moisture detection circuit and to the control module. The voltage source and the moisture detection circuit may provide voltage levels to the control module when the moisture detection circuit detects dry or wet conditions, or conditions between those conditions. A voltage level to the control module may indicate whether the appliance, such as a water heater, a washing machine, or a dish washer, has a leak. If the leak is deemed by a voltage level from the circuit to be worthy of concern, then a display, an alarm, a message, or other notice mechanism may indicate an issue or what action needs to be taken.

First claim

What is claimed is:

1. A moisture detector comprising:
a water heater control module;
a moisture detection circuit connected to the water heater control module; and
a voltage source connected to the moisture detection circuit and to the water heater control module such that a voltage level provided to the water heater control module by the voltage source and the moisture detection circuit indicates whether a water heater that the water heater control module controls has a leak; and
wherein:
the voltage source and the moisture detection circuit provide a first voltage level to the water heater control module when the moisture detection circuit detects a dry condition;
the voltage source and the moisture detection circuit provide a second voltage level to the water heater control module when the moisture detection circuit detects a wet condition;
the voltage source and the moisture detection circuit provide a third voltage level to the water heater control module when the moisture detection circuit detects a condition between the dry condition and the wet condition;
when the third voltage level is between the first voltage level and the second voltage level, no action is needed relative to the water heater having a leak; and
when the third voltage level is at the second voltage level, action is needed relative to the water heater having a leak.

2. The detector of claim 1 , wherein the second voltage level indicates a condition of moisture that causes the water heater control module to reduce a water temperature set point of the water heater, flash an error code, or send an electronic message, to indicate a presence of moisture due to a leak in the water heater; or the second voltage level indicates a wet condition that uses the water heater control module to go to a pilot light only mode for the water heater, flash an error code, shut down the water heater, sound an audible alarm, or send an electronic message, indicating that action is needed to prevent water damage.

3. The detector of claim 2 , wherein the audible alarm is powered by a super capacitor that is charged by power from the voltage source.

4. The detector of claim 1 , wherein the voltage source and the moisture detection circuit are connected in series.

5. The detector of claim 1 , wherein the voltage source and the moisture detection circuit are connected in parallel.

6. The detector of claim 1 , wherein the moisture detection circuit comprise a sensing element that has a resistance that changes upon contact with moisture; or the moisture detection circuit comprises a sensing element that indicates contact with moisture without a change in resistance.

7. A method for detection of a leak from a water heater comprising:
connecting a moisture detector to a control module for a water heater;
connecting a voltage source to the moisture detector; and
indicating whether the water heater has a leak by providing a voltage level to the water heater control module from the moisture detector; and
wherein:
the moisture detector has a resistance that changes upon contact with moisture;
changes of the resistance of the moisture detector change the voltage level provided to the water heater control module;
changes of the voltage level provided to the water heater control module are detected by the control module and interpreted by the control module as a change in a level of moisture detected by the moisture detector;
the moisture detector is situated in a place where if the water heater has a leak, moisture from the leak would gather at the place;
a first level of voltage indicates a lack of moisture in the place where the moisture detector is situated;
a second level of voltage indicates wetness in the place where the moisture detector is situated;
a third level of voltage indicates a condition of moisture between a lack of moisture and wetness in the place where the moisture detector is situated
when the third level of voltage is between the first level of voltage and the second level of voltage, no action is needed relative to the water heater having a leak; and
when the third level of voltage is at the second level of voltage, action is needed relative to the water heater having a leak.

8. The method of claim 7 , further comprising equating an amount of a change of voltage of the voltage source, detected by the control module to an amount of change of moisture detected by the moisture detector.

9. The method of claim 7 , wherein:
when the third level of voltage is at the first level of voltage detected by the control module, no action is needed relative to the water heater; and
when the third level of voltage is at the second level of voltage detected by the control module, the control module goes into a pilot light only mode for the water heater, flashes an error code, shuts down the water heater, sounds an audible alarm, or sends an electronic message to indicate that action is needed to prevent or minimize water damage caused by a leak in the water heater.

10. The method of claim 9 , wherein:
the control module is powered by the voltage source; and
the voltage source is an item selected from a group comprising thermopiles, line power, batteries, solar cells, charged super capacitors, and wind generators.

11. An appliance leak detection system comprising:
a leak sensor, the leak sensor having a resistance that changes according to an amount of dampness or wetness detected by the leak sensor;
a control module connected to an appliance; and
a voltage source connected to the leak sensor and the control module such that a magnitude of voltage from the voltage source is present at the control module and when a resistance of the leak sensor changes, the magnitude of voltage present at the control module changes; and
wherein:
the appliance is selected from a group comprising a water heater, a dishwasher and a washing machine; and
the leak sensor is located in an area where dampness or wetness would appear if the appliance had a leak, and would be sensed by the leak sensor such that an amount of dampness or wetness detected by the leak sensor varies from a dry condition to a wet condition;
the dry condition indicates zero percent moisture and the wet condition indicates one hundred percent moisture; and
a level one is a dry condition;
a level two is a predetermined percent of moisture greater than zero percent;
a level three is a predetermined percentage of moisture greater than that of level two and less than one hundred percent moisture; and
a level four is a wet condition.

12. The system of claim 11 , wherein:
the leak sensor has a resistance of an open circuit when situated in an area of dryness and has a resistance of a short circuit when situated in an area of wetness, or the leak sensor has a resistance of a closed circuit when situated in an area of dryness and has a resistance of an open circuit when situated in an area of wetness; and
the leak sensor is selected from a group of items comprising non-discrete variable resistance moisture detectors, discrete variable resistance moisture detectors and moisture sensitive switches.

13. The system of claim 11 , wherein when the magnitude of voltage present at the control module changes, the control module recognizes a change of an amount of dampness or wetness detected by the leak sensor.

14. The system of claim 11 , wherein:
at level one the control module operates in a routine manner;
at level two, the control module operates in a routine manner;
at level three the control module flashes an error code, changes an operating level or reduces a water temperature set point of the appli

Assignees

• Honeywell Int Inc

Inventors

• Hazzard Frederick
• Khosla Ravindra
• Heil David

Classifications

• G08B25/08

  using communication transmission lines {(G08B13/19658, G08B21/0286, G08B25/016 take precedence)} · CPC title

• G01N27/223

  for determining moisture content, e.g. humidity (rain detectors on vehicle windows B60S1/0825) · CPC title

• G08B3/10

  using electric transmission; using electromagnetic transmission · CPC title

• G08B21/20 Primary

  responsive to moisture · CPC title

• G01M3/16

  using electric detection means ({G01M3/045,} G01M3/06, G01M3/12, G01M3/20, G01M3/24, G01M3/26 take precedence) · CPC title