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Old 02-01-2013, 12:52 PM   #1
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Orientation of Humidifier to Coils


Hi!

I'm getting ready to install an Aprilaire 700 Humidifier on my Lennox ML 193 Furnace. When reading the installation instructions, it shows the 'typical' installation is mounting the humidifier on the face of the cooling coils. Basically, when you cut the hole, you should see the face of all the coils and not the triangle space of it.

I was wondering why this is, and if you had to. I'm also wondering how you know the orientation of the coil before you start cutting. I'm about 99% sure that it will be installed opposite of where the coil drains and the coolant enters. So, for example...

Code:
---Coolant --  |   /  \   | <- install here
---Drain ----- | / coil \ | <- humidifier
               |/        \|
Am I correct in my basic example?

Thanks!

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Old 02-01-2013, 04:32 PM   #2
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Orientation of Humidifier to Coils


Yep, thats the usual orientation.

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Old 02-01-2013, 05:23 PM   #3
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Orientation of Humidifier to Coils


To me, furnace mount humidifiers are a wast of time and money, but maybe other people actually service them every week. I have had the best results with a floor console like sears sells.

Last edited by jagans; 02-01-2013 at 05:28 PM.
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Old 02-01-2013, 05:43 PM   #4
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Orientation of Humidifier to Coils


The drain on all the coils I have ever seen is at the front of the coil and that is where the triangle plate is and that blocks airflow thru the humidiifer. Most coils also have the coolant lines entering there so I think your pic is slightly wrong. CAREFULLY, VERY CAREFULLY drill a 1/4" hole until it JUST perforates the metal. Then poke around with a nail or thin screwdriver and if you hit nothing then enlarge the hole and look inside and then patch it with metal or silver foil duct tape if you got the wrong side

General 1042 bypass humidifier is what I have, built like a tank and I have not had to clean it or change the pad in 8 yrs as my water supply is clean and house is clean and I change my filters. Almost bombproof unit.
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Last edited by yuri; 02-01-2013 at 05:45 PM.
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Old 02-01-2013, 06:12 PM   #5
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Orientation of Humidifier to Coils


Ah, ok. Thanks for the information.

I took a look around tonight, and I see a good spot, but it's above the coils. I believe that this is a preferred spot, so you don't even mess with them and you get the most humid air into the system.

Is this acceptable? Can I not even worry about messing around with figuring out the orientation of the coil?

Thanks again for all the responses.
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Old 02-01-2013, 06:22 PM   #6
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Orientation of Humidifier to Coils


Quote:
Originally Posted by wiz561 View Post
Ah, ok. Thanks for the information.

I took a look around tonight, and I see a good spot, but it's above the coils. I believe that this is a preferred spot, so you don't even mess with them and you get the most humid air into the system.

Is this acceptable? Can I not even worry about messing around with figuring out the orientation of the coil?

Thanks again for all the responses.
Yes it is acceptable.
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Old 02-01-2013, 06:23 PM   #7
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Orientation of Humidifier to Coils


Great, thank you for the quick response!

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