Keep reading to the next section to learn how to maximize the efficiency of your electric furnace. Electric heat is in some ways much simpler than either gas or oil, but it can still have its fair share of problems. Furnace flue draft control 5 inch professional#Set the upper pointer at about 115 degrees Fahrenheit (46.1 degrees Celsius) and the lower one at about 90 degrees Fahrenheit (32.2 degrees Celsius).ĭo not try to adjust the burner of an oil furnace call a professional service person.įinally, we have electric furnaces and heaters. Pointers should be set about 25 degrees apart. There are two pointers on the fan side the blower turns on at the upper pointer setting and shuts off at the lower pointer setting. One side is marked LIMIT don't touch this side. To do this, remove the control's cover and find the toothed dial underneath. If the blower control has been set to ON, change it to AUTO if the blower control is already on AUTO, the limit switch needs to be adjusted. To determine the problem, check the thermostat. If the blower runs continuously, either the blower control on the thermostat has been set to the ON position, or the limit control switch needs adjustment. It also shuts off the blower when the temperature drops to a certain level after the burner has shut off. Test for exhaust gas spillage at the draft hood or the barometric draft control after approximately. If the plenum gets too hot, the limit switch shuts off the burner. The limit switch is a safety control switch and is located on the furnace just below the plenum. The draft regulator should be adjusted by a professional service person as part of regular annual maintenance. COMBUSTION Combustion is the reaction which takes place when fuel ( C, Hydrogen or Sulphur) unites with oxygen ( from air) to liberate heat. Forced Draft Heater : Fan to supply combustion Air Balanced Draft Heater : Combination of ID & FD. Induced Draft Heater : Fan to remove flue gases. To decrease airflow, turn the counterweight outward. FURNACE TYPE - DRAFT Natural Draft Heater : Stack effect. To increase the airflow, screw the counterweight inward. Flue-draft-malfunction detector and shut-off control for oil burner furnaces automatically stops operation of the oil burner in event of flue draft. Too much air in the chimney wastes heat too little air wastes fuel by failing to burn it completely. Accumulated soot and rattling are signs that the draft regulator needs to be adjusted. This article and video are strictly for informational and demonstration purposes.The draft regulator, located on the stack, is closed when the burner is off but opens automatically to let air into the chimney when the burner is turned on. This is a very serious issue and a furnace MUST be installed by a licensed HVAC technician. The average draft in the fired heaters maintained is at almost 3-4 times the value recommended. Most of the heaters are operating with very high draft. (This is not something to try at home, the furnace exhaust contains dangerous carbon monoxide. While most of the plant operators and engineers are aware of the importance of controlling Excess Oxygen in the fired heaters, the draft control in fired heaters is often over looked. What do you think will happen? Check it out! We’ve put a plastic flue pipe onto a gas furnace and run 500 degrees into it – simulating the heat of a low-efficiency furnace. So, understandably, these flue types are NOT interchangeable.Ĭheck out the video where we run a test to show you the importance of matching your furnace exhaust pipe to your furnace type. Plastic pipe is only rated to about 212 – 250 degrees Fahrenheit.Ī 92% or higher furnace produces condensation as a by-product and would rust the metal pipe, creating holes and then letting the exhaust. A metal flue pipe is built to withstand that level of heat and won’t melt, but the plastic PVC pipe is not. This is important because an 80% furnace will put out exhaust at about 500 degrees Fahrenheit through the flue pipe. If you have a 92% or higher efficiency furnace than you should have a plastic flue pipe. If you have an 80% efficiency furnace, then you need a metal flue pipe. For more on this see our video: What is AFUE? (Furnace efficiency is also known as AFUE. Standard Efficiency furnaces produce heat at 80% efficiency while high efficiency gas furnaces produce heat at 92% - 96% efficiency. Furnace exhaust is dangerous and so having the right furnace exhaust pipe is important.ĭifferent types of furnaces require different types of flues. Exhaust Connector with Damper for air Dryer and ducting. Furnace flue draft control 5 inch free#FREE Shipping on orders over 25 shipped by Amazon. It’s good to have an understanding of what they are and why they’re important … and how they match to your furnace efficiency.Ī furnace flue pipe (also known as a vent pipe or simply as a flue), vents the exhaust from your furnace to the outside of your home. Galvanized Back-Draft Damper with Rubber Seal - Draught Stopper Damper (5'') 205. Furnace flue pipes may not be something you’ve thought about before, but they’re an important part of your gas furnace system.
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