Connecting HE120 humidifier to Lennox furnace

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Old 03-14-15, 08:26 AM
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Connecting HE120 humidifier to Lennox furnace

I am planning to install HE120 on Return duct with Humidistat on top and bypass on supply duct as per instruction manual.
As per my current supply and return ducts, bypass location will be higher than Humidistat and of course higher than humidifier. Is this OK for best performance?
Second question is : Can I wire this to my LENNOX Sure Light circuit board 4544-E?
There is HUM point on it, where all other terminals are in 120 row.
I am not sure it's 120 or 24 volt. How can I test it?

Thanks and regards.
 
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Old 03-14-15, 10:05 AM
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Welcome to the forums.

The HE120 is a drum type humidifier with reservoir and is very efficient when it comes to water usage but will require constant cleaning if you have hard water.

You want the humidistat to monitor incoming air that has not been humidified.
The HUM terminal on that board is 120vac.

You'd need to follow this diagram.....

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Old 03-14-15, 10:35 AM
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Thanks Pete for quick response with diagram and detail for wiring.

Please let me know about ==> As per my current supply and return ducts, bypass location will be higher than Humidistat and of course higher than humidifier. Is this OK for best performance?
 
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Old 03-14-15, 10:42 AM
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The height between the two openings is not critical.

As I mentioned.... just make sure your humidistat only sees air from the house before it gets to the furnace and humidifier.

You don't have to mount the humidistat in a duct. It can be mounted in another room.
 
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Old 03-14-15, 10:47 AM
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OK. got it.

Thanks again.

Great site with lot of detail ..
 
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Old 03-16-15, 10:14 AM
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Got this HE120 unit, as per template, I have to cut 7inch high by 9inch wide in plenum to mount humidifier.
Problem is my return duct is only 10 inch wide, so that will leave only 1/2 inch on both side for a support. Even manual (page5) says, duct must be 11 inch wide.
So, can I use 1x3 or something inside duct as a support or that will be a problem with flow and moisture in summer when AC is on?

As mentioned earlier I do not have much room on supply duct.

an I install unit on furnace body itself? Where AC A-coil is? Of course, I have to make sure position of AC A-coil and not to damage it.

Thanks.
 
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Old 03-16-15, 10:21 AM
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If you installed it on the furnace that would be in the plenum over the furnace.... correct ?
Usually the A/C coil is not actually in the furnace unless it's a heat pump.

I don't see how 1x3's would help inside the duct work. I would think that they would overlap and block the opening.
 
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Old 03-16-15, 10:45 AM
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N. I am talking about installing on furnace wall where A-frame is inside.
Reason, top of furnace (supply duct) is only 15 inch high and than duct turns 90 degree parallel to floor above.

Also, instead of 1x3 may be some other sturdy material but less wider?
 
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Old 03-16-15, 10:49 AM
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It sounds like it should be ok. Hard to say for sure without seeing it.
Like you mentioned.... be careful of the coil.
 
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Old 03-22-15, 11:17 AM
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Hi PJMax,

Sorry to bother again. But I have to drop idea of HE120. Reason : not enough width in return duct and not much hight in supply duct.

I came accross Rotary Disk Humidifier by Desert Spring DS-3200. Do you have any info. on this or any other member can shed some light.
Desert Spring Products - Rotary Disc Furnace Mount Humidifier
Requires only 6"H X 7.8"W opening in return duct.
As usual, there are mix reviews on web, but I am leaning towards this one because of small opening requirements.
Available in Canada and they do ship it to USA.
 
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