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Connecting a generator to my heating furnace?

Asked Dec 27, 2011, 11:55 AM — 5 Answers
Help!....I am completely confused on why my portable generator will not start my furnace!. When I connect the wiring I have power to the furnace but it will not start.
I have tried everything and could use some help please.
Here is what I have...a single black and white wire (from the main power supply) that connect to a black and white wire from the furnace. There is also a yellow wire that connects to the white wire from the furnace. This yellow wire goes to the combustion blower...that's it. The power line coming from my generator has a three prong wire. Not sure why there is not a ground wire going that connects any of the wires between the house current and the furnace...just the 3 furnace wires and 2 main power supply wires. Again, when I start the generator, I do have ample power
At the furnace, it just won't start. Any help would be much appreciated!
Thanks,
Frank

5 Answers
smoothy's Avatar
smoothy Posts: 15,494, Reputation: 10703
Uber Member
 
#2

Dec 27, 2011, 11:58 AM
Where is your thermostat drawing power from?
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FRANK55's Avatar
FRANK55 Posts: 4, Reputation: 10
Junior Member
 
#3

Dec 27, 2011, 11:59 AM
Problems connecting my furnace to a generator..HELP
Help!....I am completely confused on why my portable generator will not start my furnace!. When I connect the wiring I have power to the furnace but it will not start.
I have tried everything and could use some help please.
Here is what I have...a single black and white wire (from the main power supply) that connect to a black and white wire from the furnace. There is also a yellow wire that connects to the white wire from the furnace. This yellow wire goes to the combustion blower...that's it. The power line coming from my generator has a three prong wire. Not sure why there is not a ground wire going that connects any of the wires between the house current and the furnace...just the 3 furnace wires and 2 main power supply wires. Again, when I start the generator, I do have ample power
At the furnace, it just won't start. Any help would be much appreciated!
Thanks,
Frank
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Fr_Chuck's Avatar
Fr_Chuck Posts: 72,597, Reputation: 37026
Expert
 
#4

Dec 27, 2011, 12:08 PM


What type of furnace do you have, gas, using the electric only to do the auto light and the blowers) or a electric furnace?

If all electric, how many watt is it, and have you considered the need for starting watts to get motor turned on.

How large is your generator?
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FRANK55's Avatar
FRANK55 Posts: 4, Reputation: 10
Junior Member
 
#5

Dec 27, 2011, 12:15 PM
I have a gas furnace with electric starter (no pilot light)
The generator rate 3250 watts.
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FRANK55's Avatar
FRANK55 Posts: 4, Reputation: 10
Junior Member
 
#6

Dec 27, 2011, 12:23 PM
Where is your thermostat drawing power from furnace with battery back-up
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