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Old 03-29-2013, 04:49 PM   #1
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Humidifer wiring


I have a honeywell humidifier that came with a 24v transformer. I noticed a HUM terminal on the furnace board. My transformer has a red and white wire. Can I wire this directly to the furnace? If so, how?
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Old 03-29-2013, 05:09 PM   #2
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Humidifer wiring


The transformer's primary hot wire goes to the hum terminal, and the neutral to the neutral terminals of the furnace board.
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Old 03-29-2013, 05:21 PM   #3
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Humidifer wiring


Some circuit board hum terminals are 24v output and some are 120v.Need to check with a meter or check manual for specs.
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Old 03-29-2013, 05:26 PM   #4
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Humidifer wiring


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Originally Posted by beenthere View Post
The transformer's primary hot wire goes to the hum terminal, and the neutral to the neutral terminals of the furnace board.
Ok, so the red hot wire to goes to the HUM terminal and the neutral common white wire goes to the C terminal?
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Old 03-29-2013, 05:30 PM   #5
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Humidifer wiring


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Originally Posted by HVACTECH96 View Post
Some circuit board hum terminals are 24v output and some are 120v.Need to check with a meter or check manual for specs.
To check with a meter I place one lead on the hum terminal and the other where exactly?
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Old 03-29-2013, 05:40 PM   #6
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Humidifer wiring


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Ok, so the red hot wire to goes to the HUM terminal and the neutral common white wire goes to the C terminal?
The white wire of teh 120 side of the transformer goes to the neutral terminal of the board. It does not connect to common.
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Old 03-30-2013, 08:31 AM   #7
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Humidifer wiring


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The white wire of teh 120 side of the transformer goes to the neutral terminal of the board. It does not connect to common.
This is a 24V humidifier not 120.
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Old 03-30-2013, 09:05 AM   #8
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Humidifer wiring


1) press in and tape the door switch closed
2) start the furnace on heat and after the blower starts check from the HUM terminal to ground and you may get 120 volts if not then check to the C terminal of the circuit board and you should get 24 volts if it is a 24 v hum terminal. if you get 24 v then you can hookup your humidifier to it and the C terminal after installing the humidistat in series with the humidifier
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Old 03-30-2013, 10:54 AM   #9
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Humidifer wiring


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Originally Posted by miguel24932 View Post
This is a 24V humidifier not 120.
The transformer is a 120 to 24 volt transformer. So it needs 120 volts to provide the 24 volts for the humidifier.
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Old 03-30-2013, 11:14 AM   #10
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Humidifer wiring


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1) press in and tape the door switch closed
2) start the furnace on heat and after the blower starts check from the HUM terminal to ground and you may get 120 volts if not then check to the C terminal of the circuit board and you should get 24 volts if it is a 24 v hum terminal. if you get 24 v then you can hookup your humidifier to it and the C terminal after installing the humidistat in series with the humidifier
what do you mean installing the humidistat in series with the humidifer? The humidistat is already wired and mounted.
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Old 03-30-2013, 11:16 AM   #11
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Humidifer wiring


Probably would help if we knew which model you have.
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Old 03-30-2013, 11:33 AM   #12
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Humidifer wiring


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Probably would help if we knew which model you have.
Honeywell HE240.
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Old 03-30-2013, 11:48 AM   #13
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Humidifer wiring


Ok, your model has the transformer you plug into a receptacle. So you don't need to use the Hum terminal of the furnace.

Just follow the wiring diagram in the install instructions that came with it. The humidistat is wired in series with the transformer. Just like the instructions say.
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Old 03-30-2013, 11:54 AM   #14
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Humidifer wiring


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Originally Posted by beenthere View Post
Ok, your model has the transformer you plug into a receptacle. So you don't need to use the Hum terminal of the furnace.

Just follow the wiring diagram in the install instructions that came with it. The humidistat is wired in series with the transformer. Just like the instructions say.
Right that is how I have it installed now through an outlet. Why can't I wire it to the furnace instead of using the outlet?
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Old 03-30-2013, 11:56 AM   #15
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Humidifer wiring


You can, if you wire in a box with an outlet.
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