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Discussion Starter #1
we have an old exhaust fan in the kitchen that I burned the switch out on. It's about 20 years old. (the fan /switch) The switch had all kinds of elecrical stuff on it . . . resistors, etc., it was a variable speed fan, the speed controlled by the switch..

SO.... I want to get the fan working for tomorrow, i dont care if it is always on high for now. The fan box says it is "thermally" protected. I've' tried hoooking up 120v to the fan directly, and only get a buzzing. There is a small can with two brown wires coming out of it that is in the circuit. Is this the type of motor that can only be run with a certain type of switch, ie the one i burned out? Or can I skip all of it and "hot wire" it so it'll run? I've got 120 v coming in, it says its a 60hz motor, and I can post a wiring diagram here if necessary, but let me know. It's kind of hard to see what's coming out of the motor, but it looks like a brown, white, black and a green. I tried hooking up directly to the white and black of the fan, and also reversing them, but the fan still just hums.



scott
 

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Could be white common, black for low speed & brown for high speed.

The can is probably a capacitor for starting.

Maybe the motor burnt out which took the switch out with it.
 

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Discussion Starter #3
1. it was a variable speed, not a 2 position.
2. I don't think the motor burned out. The switch burned out because I did not read the tag attached to the line coming out of the switch. The line coming out of the switch ended in a normal male plug, two prongs and a grnd. Coming out of the fan was a female receptacle. Someone plugged the line coming out of the switch into an outlet . . . and the switch fried, because it is simply to be used as a CONNECTOR to the fan, not a power supply line. The motor could not have burned out because it was not connected to the switch at the time, there was no juice going to it. The juice went into the fan unit, then lines left the fan to the switch, which controlled off/on and variable speed. But I don't get why any combination of attaching 120v to the lines only results in the same thing, humming out of the motor. There must have been some sort of "control" in the switch?

There are no web sites, nor appliance dealers who have been able to help. Going on two weeks. this is my last resort.
 

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To get more than just two speeds there may have been resistors in combination with the two windings.

Did you try it with the capacitor connected?
 

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its probably some kind of weird old capacitor start motor. the capacitor is probably dead.

jc
 

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Evil, Its hard for me to picture it from your description, just a couple shots in the dark.

DICONNECT POWER SUPPLY(IES) FIRST!

One option is to just bypass the switch- run everything wire for wire. If the plug was connected as a switch leg you should be running at full w/ this setup.

OR, this is a long shot... white and black straight in, green and brown are a switch leg? If so you should be able to twist the two (grn& brn) together then plug in your line to the wht& blk.
Thats all I've got, not like you can make it any worse.

BORN TO LURK, FORCED TO WORK.
www.NYCvinMoto.com
www.VinMoto.org
 

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evil,

just to let you know.....

i woke this morning to the house filled with smoke, as my wife dripped "some" cooking oil over the oven while it was on.

she had the front door open, but didn't have the hood vent/fan running.

happy holidays, you turkeys!

texy
 
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