There we note that millivolt thermopiles are used in lieu of a simpler thermocouple when the device needs to operate a thermostat as well as the gas valve. Watch Out : Proper selection and installation of a thermocouple is important for the device to function safely, or for that matter to function at all. The manufacturer of the heating appliance in which the thermocouple is used will provide installation instructions that must be followed for safe, reliable use of the heating appliance.
Follow the instructions in the manual or guide for your heating appliance and also review the installation instructions and bending instructions that came with a replacement thermocouple.
The connecting copper tubing length for a thermocouple is not usually critical, but the tubing must be long enough to reach without stress from the connection at the gas valve to the thermocouple's sensor mount in the gas flame or pilot flame.
The thermocouple is provided with the connecting tubing coiled neatly in a package. Don't be afraid to un-coil the tubing into a more straight line to ease installation of the device. But do not nick, kink, nor make sharp bends in the tubing. Typical thermocouple installations include instructions for bending the tubing to avoid sharp bends or nicks.
Watch out : don't modify a thermocouple other than gentle bending as described in the installation instructions. For example do not try to cut or trim the length of the thermocouple. Doing so will almost certainly make it inoperative and thus unsafe.
If your gas fired equipment also uses an igniter wire in addition to the thermocouple, they are often routed together and will need to be removed for thermocouple replacement. Take care not to damage the igniter wire and to reconnect it just as it was.
Installation steps for installing a replacement thermocouple are simple, and are made easier by looking carefully at how and where the old thermocouple was installed and where and how its tubing was routed between the gas valve and the flame sensor position. You can make your job easier by shutting off the gas supply and removing the old thermocouple intact to help select a replacement model.
Replacement thermocouples using "universal mounting" include clips and fittings that will work on most gas fired heaters and water heaters. For example Sid Harvey's Dyna-Couple universal mounting thermocouple, sold in lengths from 18" to 48" will replace Honeywell, Robertshaw, Penn Baso, White-Rodgers and other thermocouples.
Doing so risks fire, explosion, injury, even death. How to Troubleshooting Thermocouples on Gas Fired Heating Equipment First confirm that the problem is the thermocouple Typically the gas control is pushed-in or held in a spring-loaded position to force gas through the pilot light assembly to permit manually lighting the pilot flame.
If you are able to light the pilot on the gas fired appliance but when you release the gas control from it's "LIGHT" position the pilot immediately goes out, if there was a good solid flame that was clearly touching and heating the thermocouple, that is, the thermocouple was properly positioned in the pilot flame, and if you are sure that you held the control in the LIGHT position long enough for the thermocouple to heat up normally 30 seconds is plenty , then I suspect that the thermocouple is defective.
Watch out : Before trying a new thermocouple I'd suggest checking for debris in the pilot light orifice or tubing. In gas fired equipment that remains shut down for long intervals we sometimes find spiders or insects have nested in the equipment, even mud-dauber wasps, blocking proper gas flow or gas appliance venting.
We have run into this problem and also read other accounts of it concerning the Gaffers and Sattler Model S 80 FDF gas fired furnace and similar gas fired heating equipment but this debris clog problem is widespread and may show up on just about any pilot-lit gas fired appliance, even gas log fireplaces and portable heaters.
Gaffers and Sattler was an appliance brand kitchen ranges, heating equipment, air conditioning owned by Maytag and actually preceded "Maytag" as a company name. Magic Chef found its way back to Maytag in If you are looking for parts for Gaffers and Sattler equipment check with Maytag.
Check for debris blockage right at the pilot light, inside the gas tube between the pilot light and the gas control valve, and using a fine wire don't scratch or enlarge the orifice try cleaning the orifice at the pilot light itself. What would cause standing pilot flame to keep going out. Many modern gas fired heating appliances, boilers, furnaces, water heaters, use an electronic ignition or spark to light the pilot.
On these appliances there may still be a thermocouple to confirm that there is a good gas flame when the burner is on - since we don't want to continue supplying gas if there is no flame doing so risks an explosion.
If your appliance has a flexible electrical wire that connects to a sparking device at the burner or burner pilot, the appliance has no continuously-on pilot - you do not have to light the pilot manually. In addition to finding electrical wires leading to an igniter at the gas burner or gas pilot, you will also see a tag such as that shown on this gas valve on an A.
Smith gas fired Direct Igntiion water heater photo at close left. The thermocouples used in building mechanical systems are generally type K: thermocouples used in heating boilers, calorifiers, geyers, gas burner applications flame sensors. Type K thermocouples are widely used in industrial applications involving water, mild chemical solutions, hospitals and the food industry.
Here, courtesy of Pyrosales, an Australian provider of thermocouple devices, is a complete list of the types of thermocouples and their applications. On by mod - white box on wall by furnace kept beeping so I threw it away!
Jesse MacLean, Watch out : that sounds to me like a carbon monoxide monitor alarm - if so, potentially atal carbon monoxide gas is present; people in the building could be killed.
Leave the heater off and do not try to run it before it has been inspected for safe proper operation and repaired as necessary. If you ignore this advice you could be responsible for many deaths including your own. Every time my furnace turns on this white box on the wall starts making an ear piercing beep. It has a number display on it and when it starts beeping it is always some random number between 50 and , but the number steadily increases as time goes by.
He is a real cheap scape. Any advice? Martin: The flame height or strength on a gas burner pilot light is not itself usually adjustable, though if the pilot orifice is clogged you might need to clean or replace that part to get the proper flame size. The flame position or that of the thermocouple that must be immersed in the flame are often adjustable by loosening a mounting screw or on occasion by gentle bending of a metal bracket.
In addition, wires can become loose or the thermocouple may need to be recalibrated. Many of these issues can be prevented by changing your air filter and scheduling annual tune-ups. Louis furnace installation and repair contractor. We provide service all over the St. What is a thermocouple? How does a thermocouple make your furnace safer? Fantastic Job Alex J did a fantastic job installing and explaining our new heater.
I would highly recommend them Mike and Heath came out on a very cold Saturday and provided professional and friendly service. Twitter Link. Request Information. Commercial HVAC. Our Blog Home » Blog. How Does a Thermocouple Work? The thermocouple A thermocouple is a device that consists of a pair of strips of metal made from different material. Offering services to Willamette Valley for more than 60 years. Articles for you Are Heating Repairs Avoidable?
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