high limit control
And if the heat exchanger cracks, it can allow poisonous carbon monoxide gas to enter your home. If your fan keeps running continuously (and you’ve checked that your thermostat is set to AUTO rather than ON), that could be a sign of a bad high limit switch. Found on the underside of the washtub in many major brands, the high-limit thermostat is electrically in line with the heating element and held on with a single Phillips screw. 025-29041-007 - York OEM Furnace 3" Replacement Limit Switch L170 A pair of wires is connected to the switch. The high limit switch shuts down the furnace at a set limit so a clog doesn’t burn out the system. The energy used to heat that air isn’t wasted. This is a very important safety feature because if the furnace overheats, it can cause the heat exchanger to crack. Like any other part in your HVAC system, the high limit switch can wear out over time. But the blower fan keeps running for a little while. The High Limit switch "breaks" or opens to turn the burner off if the plenum temperature reaches the high limit setting. Home / Articles that Educate / Get to Know Your HVAC: The High Limit Switch, Tagged: furnace, heating and cooling, high limit switch. Not Available for Retail Sale 17 Rotor Kit. Locate the white limit switch. Turning the fan motor on and off is the high limit switch’s main job. The high limit switch shuts down the furnace at a set limit so a clog doesn’t burn out the system. SKU: 47-21604-03. A furnace is at a risk of overheating any time airflow is limited from passing through the heat exchanger. It also can shut down the furnace burners if things are getting too hot inside the furnace. The City of Farmington, Michigan 23600 Liberty Street. This switch plays a role in the normal operation of your furnace. Furnace limit switches are electromechanical devices with momentary contact. Depending on your furnace model, the switch will be surrounded by a silver or white cover. This is so that it can detect the temperature of the supply air. When the furnace begins running, the switch’s role is to turn on the blower fan when the supply air gets hot enough. Ready to get a quote from an HVAC contractor? HVAC systems consist of complex equipment with a lot of delicate parts. Navigation. SUNDANCE SPAS, High Limit Disc, for Smart Heater 6500-310 and the 6500-843 Heater 6472-525 Hi-Limit Sensor for 2016+ 880,980 Systems, 2017+ 780 Systems Sale Price: $61.00 If the blower fan turned on at the same time as the burner, it would be blowing cold air through the vents into your home. It reads the temperature of the plenum and waits until it gets appropriately warm. The high limit should not have been changed. It will be located at the top of the panel. During normal operation, the high limit switch’s main job is to control when the blower fan turns on and off. So, in addition to regular annual maintenance on your furnace, regularly replacing your furnace filter is the best thing you can do to help your high limit switch last as long as possible. High Limit Control Obsolete - Not Available. One of the most common issues that happens when a high limit switch goes bad is that it fails to signal the blower fan to turn off. That fan/limit control has a timer to turn the fan on, hence the two low voltage wires directly below the dial. Not Available for Retail Sale Not Available for Retail Sale $0.00. The high limit switch in your gas furnace is a small part with two very important jobs. Most important, before attempting a replacement, make sure the switch actually is defective. Control research at Michigan has a strong foundation in theory and is distinguished by a broad and diverse range of applications. This is when the high limit switch signals the blower motor to turn off. 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