Installing whole house humidifier


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Old 10-19-16, 10:19 PM
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Installing whole house humidifier

Hey there,

I am installing a whole house humidifier..I have decided to go with Honeywell HE120A Whole House Humidifier, because it does not require a floor drain, and I do not have one in my furnace closet. Also it is small. My question is about my furnace... is the intake the cylindrical duct in front, with the supply air plenum being the rectangle behind it? I have included a picture...just wanted to make sure I knew what I was dealing with. Any advice or tips would also be appreciated

 
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Old 10-20-16, 12:18 AM
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Welcome to the forums.

Good thing you checked. That round duct is the flue to the chimney. Don't want to cut that.

The duct work behind that is the supply to the house.
The return would come in the bottom or bottom sides of the furnace.

As you've selected a drum type humidifier.... be sure to install it where you can get to it for routine servicing. Also.... if you have an A/C coil in the furnace.... make sure you identify its location.
 
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Old 10-20-16, 08:06 AM
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Thank you!

Obviously I am a novice with HVAC. There is no A/C coil.

So looking at that picture (because its the only one I have of the furnace, and I am not living in the condo). It looks like the return is just the vent on the outside of the wall right next to the furnace? If that is the case, than there really isn't any return duct work to connect my bypass duct to, correct?

Or if the return duct work is coming straight up from the bottom of the furnace, again i would not be able to connect a bypass duct.

Do I have that correct? If that is the case than the only option is a fan powered one?

Thanks for your help
 
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Old 10-20-16, 12:01 PM
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I didn't notice the grill in the hall before but I see it now.

You are correct in that you can't use a bypass type humidifier.
 
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Old 10-22-16, 09:31 PM
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So question... it looks like the return comes up from under the furnace and in from the side through the vent directly next to the furnace.

So my question is, is there any chance that I could connect the bypass duct to the bottom part of the furnace, where the return air enters the furnace (where the red arrow in the picture is pointing)?

Not sure if this will cause any issues...
 
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Old 10-23-16, 10:11 AM
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Another thought is to connect to the return air, by cutting a hole in the floor next to the furnace. Could that work?

Or does anyone know of a drain less powered humidifier?
 
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Old 10-23-16, 11:53 AM
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You can cut in the side of the furnace where your arrow is. I wouldn't cut into the floor.

You can use the Honeywell you previously mentioned or an Aprilaire 400.
 
 

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