When does a Furnace Fan cycle when no call for heat?

Fan cycles when there is no call for A/C nor for heat – Check for the presence of a home ventilation system whose controller may be turning on and off to bring in fresh air.

What is the CFM of an indoor cycling fan?

Cubic feet per minute (CFM) – the measurement of how much air the fan can project in a minute. Range of circulation – ow far the air will travel. Useful, if you are in a big room. Not so important for indoor cycling.

What’s the difference between Furnace Fan on and fan off?

The FAN OFF setting lets the furnace blower continue to run for an interval after the furnace burner has turned off, but will shut the blower off after the heat exchanger has been cooled down to this temperature (usually 90 °F). FAN-ON: the middle setting on the fan limit switch dial (green arrow) is the “FAN ON” temperature.

Which is the lowest setting on the Furnace Fan?

The lowest setting (blue arrow, the left end of the dial) is the “FAN OFF” temperature. The FAN OFF setting lets the furnace blower continue to run for an interval after the furnace burner has turned off, but will shut the blower off after the heat exchanger has been cooled down to this temperature (usually 90 °F).

How does the Furnace Fan work during the heating cycle?

The furnace air handler blower FAN goes OFF and then back ON during the heating cycle while the thermostat continues all the time to call for heat, and the BURNER KEEPS RUNNING.

When to turn Furnace Fan on or off?

When your system reaches the temperature you’ve set for it, the fan will shut off until the next cycle. “On” option––Air is always being cycled through your furnace filtration system when your fan is continually running. The result is better air quality, since particles are constantly being removed from your air.

What are the downsides of having a furnace fan running?

Another downside is you’re going to be replacing your furnace filter more frequently, since your air is being continually cleaned. Also, in the winter, you may feel a little cold from time to time. Since the fan is running even when the furnace isn’t running through a heat cycle, cold air will be blowing through your vents during that time.

How often should a furnace cycle on and off an hour?

Answer: Two-stage furnaces work longer than single-stage ones. Thus, it should cycle 1-3 times in an hour and the heating session will be 8-12 minutes each time. How often should a gas furnace cycle on and off an hour? Answer: A gas furnace should cycle on and off 3-8 times an hour ideally.

Why is my heat pump fan not spinning?

What should I do if my Furnace Fan keeps running?

The furnace burner should stop, but the blower fan should continue to run after the call for heat stops until heat has been extracted from the heat exchanger and supply plenum. If the blower fan cycles on and off as before, then the problem is not the wall thermostat.

What does it mean if your heat pump is not working?

Homeowners often report a heat pump fan not spinning. Heat pump yes, Fan no: The heat pump is running, but the fan isn’t. Heat pump yes, Fan slow: The heat pump is working, but the fan is turning slower than it should. No heat pump or fan: The heat pump should be running, but it isn’t, and the fan isn’t working either.