PaintGuy
Dec 4, 2007, 10:25 AM
I was given a used 1/3 HP Emerson furnace fan to be used in my home made auto paint spray booth. I have no idea if it even works. Emerson seems to be Very stingy with their wiring diagrams + I am not remotely an electrician.
I believe it to be either a three or four speed unit and after testing to see if it works, I would like to get a fairly simple switch so I can change speeds easily.
The wires coming from the motor are red, white, blue, black. There is a separate green ground wire. And two brown wires go directly from the motor to the capacitor with no wires coming from it.
For now I will use a heavy duty wall socket using green for the ground portion, but what wires would I use for the wide spade connection and which for the narrow one? Also which wires would I switch out to check out how much air output there is at the other speeds?
Assuming it works, what would I ask for when buying a three or four speed switch? I assume it has to be fairly heavy duty.
I'm enclosing a similar type question and his own answer from 11/02/05.
"I've read (most) of the similar questions about blower motor wiring, but haven't seen any that match my configuration. I have an Emerson 1/3 hp, 3spd motor with the following wires:
"Red, blue, black, green (ground) direct from motor. White and brown go from motor to capacitor with black out of capacitor.
"I believe Red is low speed, blue medium, and black high. Seems like black from capacitor would be common, but if it was white, I'd feel more confortable about guessing!
"Any suggestions??
"Emerson has not replied to email for schematic information.
"Thanks
"labman,"
"Thanks for your quick reply. I decided to take a chance. I connected the black wire coming from the capacitor to neutral, black from motor to hot, and green to ground. It ran at what I presumed was fast speed. I replaced motor black with blue and it ran at a slower speed. Since I'm only interested in turbo air, I stopped there and didn't bother with red. I'm sure that would provide lowest speed."
"Thanks again!"
I believe it to be either a three or four speed unit and after testing to see if it works, I would like to get a fairly simple switch so I can change speeds easily.
The wires coming from the motor are red, white, blue, black. There is a separate green ground wire. And two brown wires go directly from the motor to the capacitor with no wires coming from it.
For now I will use a heavy duty wall socket using green for the ground portion, but what wires would I use for the wide spade connection and which for the narrow one? Also which wires would I switch out to check out how much air output there is at the other speeds?
Assuming it works, what would I ask for when buying a three or four speed switch? I assume it has to be fairly heavy duty.
I'm enclosing a similar type question and his own answer from 11/02/05.
"I've read (most) of the similar questions about blower motor wiring, but haven't seen any that match my configuration. I have an Emerson 1/3 hp, 3spd motor with the following wires:
"Red, blue, black, green (ground) direct from motor. White and brown go from motor to capacitor with black out of capacitor.
"I believe Red is low speed, blue medium, and black high. Seems like black from capacitor would be common, but if it was white, I'd feel more confortable about guessing!
"Any suggestions??
"Emerson has not replied to email for schematic information.
"Thanks
"labman,"
"Thanks for your quick reply. I decided to take a chance. I connected the black wire coming from the capacitor to neutral, black from motor to hot, and green to ground. It ran at what I presumed was fast speed. I replaced motor black with blue and it ran at a slower speed. Since I'm only interested in turbo air, I stopped there and didn't bother with red. I'm sure that would provide lowest speed."
"Thanks again!"