This article explains what a thermocouple (or thermopile) is, how these devices work, where they are installed, and what goes wrong with thermocouples. Everything was working fi... American Standard/Trane Ignitor comes on, gas valve clicks, then fails to light. Here are some typical questions asked by readers and Expert answers. Many gas fireplaces operate with a remote control. The link below is a video of how it works. Although many gas fireplaces have a knob or ignitor switch to light the fire, some older gas fireplaces units have a metal key that is inserted into a keyhole which turns on the gas flow to start the fire. No Ignition. Also known as unvented or vent-free fireplaces, a ventless gas fireplace operates with natural gas or liquid propane (LP) that flows into a gas burner mounted in the fireplace. I have an old Ametican Standard hot water boiler. Too much pressure could result in fires or explosions. The inside of the valve had failed therefore the gas was unable to be supplied into the fireplace area. The thermocouple senses the gas pilot flame and prevents flow to the main burners when there is inadequate heat to ignite the burner. Most fireplace manufactures attach a shutoff valve to the device’s gas line, giving you greater control over your natural gas output. They burn cleaner than a traditional wood-burning fireplace and produce no ash or soot to clean up. In the fireplace, that is. These sensors contain material that creates a small amount of voltage when heated. BOTH. We describe how to find the thermocouple if one is used on your heater, and how the thermocouple is replaced. The pilot flame heats both the thermocouple and thermopile sensors. You can turn down the thermostat, and turn up the heat! However, this isn’t necessarily the case. How a Combination Gas Valve and Thermocouple Work! DoItYourself.com®, founded in 1995, is the leading independent When learning how to turn on a gas fireplace without a key, see if the unit has a control panel with an igniter switch. The thermocouple still acts to prove that the pilot flame is on and allows this flame to continue after startup. onlyfire Products 1/2 Inch Straight Quarter-Turn Ball Shut Off Valve Kit with Chrome Floor Plate and 3-Inch Key . The most common type of gas fireplace uses a millivolt ignition system. The thermocouple generates about 20-30 millivolts, enough electricity to keep the part of the gas valve that controls gas flow to the pilot assembly open. Website operating Most fireplace remote controls give you two options—on and off. Sometimes the original plumbing of your gas fireplace puts your valve in an inconvenient spot, especially if you've renovated the room. This creates a higher temperature. Need help troubleshooting or repairing a gas fireplace? Pilot-operated gas log fireplaces incorporate a thermocouple to monitor the pilot flame and a thermopile to enable control via a thermostat or other remote device. When you are finished reading, warming yourself, or otherwise enjoying the fireplace, use the key to turn the flame back down until only the pilot light is burning. When ignited, the flames run through gaps in artificial ceramic fiber logs, giving the illusion of a real wood-burning fireplace. The fireplace consists of incombustible "logs" covering gas vents, and the fire itself burns behind glass doors. The limit for a unvented gas fireplace valve is forty thousand BTU's regardless of the size of the fireplace burner. The thermopile is basically just a large thermocouple, but instead of generating 20-30 millivolts, it generates up to 900 millivolts, enough power to ignite the main burner when the wall switch is turned on. 4.6 out of 5 stars 40. This is also why it stops releasing gas if the pilot light goes out. The lower gas flow ensures air particle emissions can be reduced with other gas log safety features including log stacking designs. Twist the key and the flame turns up, increasing the heat that radiates from the fireplace. Most modern VENTED gas stoves, fireplaces and vented gas log sets with thermostat or remote control. The thermopile is basically just a large thermocouple, but instead of generating 20-30 millivolts, it generates up to 900 millivolts, enough power to ignite the main burner when the wall switch is turned on. As the gas passes over the pilot light, the gas is ignited. The control valve regulates the pressure and the amount of gas that is supplied to the unit. Thermocouple, Thermopile, and Wiring: The thermocouple is a metal probe that controls the gas valve, sensing the temperature and generating electricity to ignite the gas if necessary. It gives off both radiant and convected heat and provides an experience similar to … $23.99 $ 23. with the thermocouple, the gas valve allows gas to flow to main burner until the call for heat is satisfied. A solenoid valve is controlled with an electric current through the solenoid to allow/restrict the flow of gas; unlike a millivolt valve, this solenoid requires a larger amount of voltage than a thermocouple/thermopile can produce to snap open, where it makes use of latching magnets that secure the solenoid in the open position - thus, the "latching" solenoid doesn't require a constant electric … - YouTube The major portion of the heat that a fire creates is in the form of hot gas. The pilot flame heats both the thermocouple and thermopile sensors. All rights reserved. It incorporates air-movement channels that maximize the warmth supplied to the house. • Intermittent pilot (also known as “spark to pilot”) – Pilot is ignited by a spark generated by an ignition module and electrode. FREE Shipping on orders over $25 shipped by Amazon. Make sure you choose the type of valve that will best suit your needs. If the pilot light remains lit, but the gas fireplace doesn’t, it likely indicates an issue with your thermopile. The thermopile powers a second circuit that operates the main valve. Gas fireplace won’t stay lit, but the pilot light does. The thermocouple on your gas fireplace is a heat-sensitive device that keeps the pilot gas tube open while the pilot is lit. The old gas valve was hidden and defective so they called me to make it work. A lot of gas stoves use 2 heat generating thermo sources. A device called a thermocouple will hold open the pilot light valve as long as the pilot light is lit. The thermocouple generates about 20-30 millivolts, enough electricity to keep the part of the gas valve that controls gas flow to the pilot assembly open. The valves are always closed unless something opens it. Questions of a Do It Yourself nature should be When your gas fireplace stops working the way it should, you might think that you must immediately call a repair person and watch your money disappear. a thermocouple and a thermopile. I recently installed brand new Kohler valve and all the parts for a new Bat... At my cottage I have a new NG water heater. But the principle of convection is also at work in a fireplace, and this is one reason why they can be so inefficient. There are straight gas ball valves and angled gas ball valves. View our Privacy Policy here. We ran some tests and determined that the valve was stuck in the closed position. This prevents potentially deadly gas from sitting around and escaping in to the environment. Fortunately, most gas fireplace issues require nothing more than a little troubleshooting. Readers want to know how to troubleshoot gas fireplace problems. Here are some excellent troubleshooting tips … Modulating Flame Fireplace Remotes Control your flame height with ease. These valves are vital for the operation and safety of any gas appliance. The most common gas appliance found in US homes is the hot water heater, although the valve serves the same purpose for heating systems and stoves as well. The first gas log fireplaces were simple---just a pipe with a valve and a set of ceramic logs in a wood-burning fireplace. This valve is similar to the thermocouple only valve, however has a pilot which heats up . Try these suggested fixes to get your gas fireplace working normally again. Check the breaker box and reset any tripped breakers you run across. The thermocouple is in the pilot flame which must be lit for gas to enter and if the flame goes out, this low (20 millivolt) signal goes to zero and the main solenoid valve closes cutting the gas supply off, which is a safety measure. If the system involves opening a gas valve with a fireplace key, use a long match or lighter. How Gas Fireplaces Work with an IPI vs. Milivolt Ignition System. Identifying All the Different Gas Furnac... Identifying All the Different Gas Furnace Parts. The thermopile, like the thermocouple, is a temperature sensor that generates electric voltage. You can usually identify if the valve is open because the handle will be in line with the pipe. As you can see, the hearth serves as a protective heat shield for many components within and near the fireplace. Too little pressure will not allow the proper amount of gas to be ignited for the appliance to operate. A gas fireplace is actually a great, energy-efficient way to heat your home. This is also why it stops releasing gas if the pilot light goes out. Copyright© Replaced c... [left]I have an XL80 Trane furnace, I see the call for heat, the induced dr... How to Select Gas Valve Replacement for Old Furnace. 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