I inspected two electric furnaces yesterday both were less than 10 years old. Neither had a blower door switch. I thought all newer blower doors should have a switch. Is there anything out there for systems that shouldn’t?
Nicrome wire is super sensitive to heat if the unit was operating and it had a door switch it would kill the blower fan before the heating elements had a chance to cool down (not good)
When an electric furnace is satisfied by its thermostat the stat just turns off the heating elements the fan continues to operated and is turned off by temp
In my world a furnace has oil, gas or electrical elements and are referred to as a furnace as long as it supplies a source of heat. A air handler is thought of as commercial AHU chilled water coils and steam heat or hot water:p
Furnace
A furnace has four main parts: the burner or combustion chamber, where natural gas or another fuel is burned; the heat exchanger, where the heat from the burner—but not the potentially dangerous gases produced by combustion—transfers to the home’s air supply; the blower, which forces the heated air through ducts into the home; and the flue or vent, which carries combustion gases such as carbon monoxide to the outside.
Some furnaces heat water, not air, for use in radiators or steam pipes. These furnaces are usually referred to as “boilers.”
Air Handler
Air handlers work in conjunction with a heat pump, a device that uses refrigerants to move heat energy from one place to another. The handler has a blower that forces air through the house, and the refrigerant lines run through the air stream just “downwind” from the blower. During the summer, the refrigerant pulls heat out of the air steam and moves it outside; the result is that the air handler blows cool air. In the winter, the refrigerant pulls heat energy from the outside air—yes, there is heat energy even in cold winter air—and moves it inside, with the result being that the air handler blows warm air. The air handler is not heating (or cooling) the air. It’s just blowing the air past the refrigerant lines, which are changing the temperature. That’s what makes an air handler different from a furnace.
For homes with both a furnace and central air conditioning, the furnace’s blower acts as the air handler for the air conditioning system.
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As their name implies, electric furnaces use electricity to heat and distribute air throughout your home. … An electric furnace moves air over and through a series of heated coils. Then it distributes this air throughout your home via a system of ductwork and vents.
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I wasn’t disagreeing with you Charlie.
1st sentence in my post on air handlers. (Air handlers work in conjunction with a heat pump, a device that uses refrigerants to move heat energy from one place to another.)
A furnace is a system that will only heat your home, and will need to be matched with a cooling system for the warmer months.
Electric air handlers do not require a switch at the door because you are suppose to flip the breakers at the handler before removing
any covers.
rcloyd
(Russell Cloyd, KY LIC #166164, IN LIC#HI02300068)
10
If when the unit is running, you can remove the outer cover and the unit does not shut down, recommend the installation of a blower door switch for safety.
The blower door switch is a safety device that prevents the heating system from drawing air to be conditioned close to the furnace where there might be combustible gases or CO, an electric furnace has neither, so no blower door switch is needed, and what Charlie said re nichrome wires.
Thank you, everyone, for your post and keeping it civil. I learn a lot from you all. Even things I wasn’t considering like air handler vs electric furnace, which seems like it could be a separate post but interesting none the less.
