5/23/2023 0 Comments Automatic wood stove draft control![]() Warnings about Fan Limit Switch Damage and Wood Furnace Damage and Unsafe Conditions from Over-Firing or from Operation during a Power Failure I suspect that most woodstoves either have an equivalent of that control, operated by temperature, or the woodstove manufacturer includes specific instructions for use of the woodstove during a power failure. That still not prevent overheat damage but that's a question to take to the manufacturer. ![]() I think what we want is a spring-loaded combustion air damper that is held open but closes under mechanical spring force if the electrical power to the wood furnace is lost. Watch out: when the fan limit is unable to turn OFF the heating system at high temperatures, such as in the wood-stove-fire + electrical power loss case that you describe there are serious fire and flue gas safety concerns as well as the risk of a damaged heat exchanger leading to need for costly furnace repair or replacement. I'll do some research on alternative fan limit controls and you might also ask the manufacturer of your wood furnace for control suggestions. This Q&A were posted originally at FAN LIMIT SWITCH TROUBLESHOOTING FAQsīy Inspectapedia Com Moderator you for an important question. I usually have to replace one or two every winter, and thesed damn things are getting expensive. Or perhaps a fan limit that can take the excessive heat. Isn't there a non mechanical option for a fan limit? I believe the spring just expands to the point where it loses its temper. The fan limit cannot take the excessive heat and breaks. The system works great, EXCEPT, when the power goes out and there is a fire in the wood furnace. when hot, the fan switch turns on a blower which blows hot air throughout the ductwork of our house. there is an insulated box which surrounds the wood stove. My fan limit switch is installed on a wood furnace. On by Andrew - The fan limit cannot take the excessive heat and breaks. Wood-burning Furnace Fan Limit Control Warning ![]() We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article series discusses safety questions that arise if you are installing or using a wood burning stove or furnace. That does not mean that you can not use your wood-fired heater during a power failure but it does mean that if you don't follow the manufacturer's instrutions for that situation your wood-fired furnace may be unsafe. Watch out: All of the wood and coal stove furnace manufacturers' instruction manuals that we have reviewed warn against overheating, over-firing, stove damage, safety hazards, and loss of warranty coverage from such damage including damage that can occur during an electrical power failure. The fan limit switch used to control the building air circulating blower fan may be damaged by high heat encountered when used on a wood or coal burning stove if the manufacturer's warnings are not strictly heeded. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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