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How do I wire a induce fan motor

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Steve Kjr

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Induced fan motors on older units are wired through the high limit safety on the stack - in series. When the furnace calls for heat, the induced fan motor comes on and after a time the furnace will light.

Older units have a temp switch in the stack that rotates to bring on the burners and blower motor. . When there is a call for heat, the induced draft fan motor comes on and then the burners will light.

After the heat exchanger is warmed up the limit switch will bring the blower motor on. That's basically how it works - there are two circuits - one for the induced draft motor and the burners and the other for the blower and high limit.

New units have a plug on the board you just plug in.

A

Posted on Oct 06, 2014

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Anonymous

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SOURCE: Induced draft motor

The inducer motor is what takes the cabonmonoxide out of the house from the unit and should not be bypassed

Posted on Mar 08, 2009

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Cris Sparks

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SOURCE: model m1mc 090a bw furnace pressure switch open.

did you check the hose from the inducer to the pressure switch? HAVE you unplugged the unit from the wall outlet to reset the board? DO you have a voltmeter? If you do you can run voltage across the switch and if you get 24 volts you are open.

Posted on Oct 24, 2013

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I ran into a simalar problem and it was a short in the control wiring of the furnace. When there is a call for heat a relay closes to start the inducer the movement of air causes by the inducer closes the air pressure switch. This is where the problem starts.some where in the control wiring there is a dead short this causes the secondary (24volts ) to drop causing the inducer relay to open shutiing off the inducer which in turn opens the pressure switch removing the short and the cycle starts over again. The culprit in my case was the high limit switch which was shorting against the metal furnace housing. You can easily ccheck this by removing the two wires from the fan limit switch and powering up the unit to see if the inducer runs normally . If it does remove limit and replace if necessary.
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Hi,
If the inducer fan is out of balance that badly, then you will need to replace the inducer anyway....it will shake its self apart....
Me I would have fixed the wire and then ordered a new inducer right a way and then installed it in a few days when it arrived...in is trouble waiting to happen...
Put the wire back on and get a new inducer coming...

heatman101

Here is a tip that wrote about how to buy heating and air conditioning parts online.

How to find Air Conditioning, Heating and Furnace parts online.



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Hope this helps.....

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