No it is not. If it was there would be no provision for you to do so.
With central air the furnace fan must be running to provide the air to the living space. If the furnace fan is not running then you get no air out of the ducts and the A-coil (the part of the ac system that is in your furnace duct) will freeze and shut down the compressor (the part that is outside).
why does the fan still run on the unit after it cycles is over. but it is blowing hot air not cold
I just installed a propane furnace, I don't know what kind you have, but mine runs about 9 minutes. Depending on the draft or air movement around the thermostat and coolness a furnace should cycle on average, so I'm told, 3x's an hour. If you ask me that would mean some major air issues, but I'm not the furnace expert. Anyways hopes this helps. Best thing to do is call a heating-air conditioning person.
This is how a furnace heats your home. When the thermostat calls for heat, a signal is sent to the gas valve. If you have an older unit, the gas valve checks to see that the thermocouple sees the pilot and if it does, the gas valve opens to send gas to the burners. If you have a newer furnace, the thermostat sends a signal to start the pilit ignition sequence (either spark or hot plate) and then the flame rod sees the pilot (of the hot plate is up to temp.) the gas valve opens to send gas to the burner. The fan control will then send a signal to the blower to start up. As the temp rises in the room, the thermostat sends a signal back to the gas valve to close as it reaches the set point on the thermostat and the blower continues to run until the set point on the fan control is reached and it shuts off ending the cycle. If you would like futher in depth information, check out my book on Amazon called Forced hot air furnace - troubleshooting and repair.
Yes, no problem
The function of a furnace fan limit switch is to regulate the temperature inside the furnace. It helps control when the fan turns on and off based on the temperature of the air inside the furnace. If the switch is not working properly, it can cause the fan to run continuously or not turn on at all, which can lead to overheating or inefficient heating in the furnace.
It should not run continuously. Typically, the fan (sometimes called a blower) will continue to run for a minute or so after the flame is out. This does not consume much energy; it does flush the residual heated air from the ducts. Make sure the fan is set to "AUTO" on the thermostat, to ensure proper cycling.
you can leave your furnace fan run continuos, it helps even the heat in the house, it also helps with condensation on windows.
The fan should run for about 3-5 minutes after the furnace shuts off to help distribute the remaining heat throughout the house.
It will if the ac is on.
On most vehicles the fan or fans will run continuously if the A/C is on. If the A/C is off and it is continuously running check the thermal switch.
With central air the furnace fan must be running to provide the air to the living space. If the furnace fan is not running then you get no air out of the ducts and the A-coil (the part of the ac system that is in your furnace duct) will freeze and shut down the compressor (the part that is outside).
You must have a heat pump with electric auxilliary heat.
If you have the A/C turned on the cooling fan will run continuously which is normal. If that is not the case then the thermal relay may be stuck shut.
check to see if the thermostat is hung open or your temperature sensor for your fan is out and causing your fan on your radiator to run continuously when key is on.
Your fan relay is stuck or you have a bad tstat. Check your auto fan (summer fan switch ) on your furnace if equipped. Mostly older oil furnaces.
sure if you wire it that way. it wont hurt anything