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What does a thermocouple on a gas heater operate?
A thermocouple on a gas heater operates by generating a small voltage when heated by the pilot flame. This voltage signals the gas valve to stay open, allowing gas to flow to the burner. If the pilot flame is extinguished, the lack of voltage from the thermocouple will cause the gas valve to shut off, preventing a gas leak.
The voltage generated b y a thermocouple in a pilot flame should be?
30 MV open circuit
Why does your gas water heater flame go out as soon as it lights. My pilot stays lit. Is this a bad T-Stat or gas valve?
sounds like you have a bad thermocouple. The thermocouple senses the pilot flame and produces voltage to tell main flame to light. Thermocouple can be bought at any hardware store.
How does a thermocouple flame-proving function?
A thermocouple flame-proving system works by generating a small electric voltage when heated by the pilot flame. This voltage is used to validate the presence of a flame. If the flame goes out, the voltage drops, triggering the system to shut off the gas supply as a safety measure.
How close should the thermocouple be to the pilot light?
The thermocouple should be positioned within a few millimeters of the pilot light flame to ensure it accurately detects the heat produced. This proximity allows the thermocouple to generate the necessary voltage for sensing the flame's presence and preventing gas flow when the flame is out. However, it should not be so close that it risks damage from excessive heat or direct contact with the flame. Proper placement ensures reliable operation and safety.
When pilot light goes out on a boiler is gas escaping?
No. The pilot valve is closed when no flame is sensed by the thermocouple.
How can a thermocouple be used to verify that a gas flame is present?
A thermocouple can be used to verify the presence of a gas flame by measuring the temperature at the point where it is located. When a gas flame is present, it generates heat, causing the thermocouple to produce a voltage proportional to the temperature rise. This voltage can be monitored; if it exceeds a certain threshold indicative of the flame's presence, it confirms that the flame is active. Additionally, the rapid response of the thermocouple makes it effective for real-time flame detection.
Why does your Richmond water heater pilot turn off?
It is most likely the thermocouple that is bad. That is what keeps the pilot light on. The thermocouple is the small tube that sits in the flame of the pilot and runs to the control valve.
What is the thermo couling on a gas log insert?
A thermocouple is a device used to sense the flame of a pilot light. IF the pilot light is not burning, the thermocouple does not permit the main flow of gas to the gas logs. Thermocouples DO wear out, are relatively cheap, and are made to be replaced.
What should you do if the pilot won't stay lit on a Teledyne Laars pool heater but will stay on as long as the button on the control unit is pushed down but the flame goes out when released?
This is probably due to a faulty thermocouple. The thermocouple generates a small voltage when hot that is used as a security device that keeps the gas flowing to the pilot. These are relatively inexpensive (UK about �18). You can check if this is the problem by measuring the voltage on the wires coming back from the pilot. When you have the red switch depressed, check the voltage (should be about 30mV). If there's no voltage, then change the thermocouple. The thermocouple will generate up to 50mV in a pilot flame. If it falls below 20mV it should kill the fuel source. It may take a few minutes to generate enough voltage in order to keep the pilot lit, so you may have to depress the button for a minute or more. This would be typical if your unit has been off for an extended period of time.
Does the safety valve on a gas range opens when the thermocouple detects no pilot flame?
yes
You replaced the thermocouple in your furnace but the pilot light still goes out when button is released?
The pilot flame has to encompass the top half inch of the thermocouple. A dirty pilot will sometimes point the flame away and therefore not heat the thermocouple enough to hold. Take a small rubber hose about two feet long and point it at the pilot orface and blow through the hose to remove the ash on the pilot surface Now relight and try it out.
