Humidity controls: How to adjust


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Old 10-27-23, 12:57 PM
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Humidity controls: How to adjust

Humidity Controls Ė How to Adjust

My furnace has two humidity controls. One humidity control that turns on the water to the humidifier has a series of numbers (1 thru 10) to determine when the water is turned on. The other control, a humidistat, has numbers representing the percent of humidity from 15 to 45%

Iím not sure as to the sequence of adjusting the two controls so that one control does not over-ride the adjustment of the other.

For example, if I set the humidistat for 40%, how do I adjust the other control to ensure the water does not turn off before the humidity reaches 40%.?

As an aside, Iím assuming the operation of the humidistat is when the humidity reaches 40% the humidistat would turn off the water flow to the humidifier.

Thanks,

Jerry

10/27/23


 
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Old 10-27-23, 01:34 PM
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I have no idea what humidistat you are referring to.
I'm not aware of anything but a humidity setting being required.
A model number of yours would be needed.
 
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Old 10-27-23, 03:17 PM
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Hello Pete -

Sorry about the confusion. I tried to upload the data sheets for the controls, but kept getting an error message. So, I did upload pictures of the controls. Hope this helps.

The humidistat is an Aprilaire with Part No. 4016. The humidity control is a Honeywell H1008A,D

Jerry





 
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Old 10-27-23, 07:52 PM
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You have two humidistats.
It doesn't look like the manual Aprilaire is connected so it's probably no longer in use.
It does look like the automatic Honeywell is connected.

The Humidicalc has an outdoor temperature sensor and uses it to adjust humidity based on the outside temperature. The overall humidity gets reduced when the outside temp is very cold.

Here's the instructions for your Humidcalc...... Humidicalc H1008 - pdf
 
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Old 10-28-23, 09:17 AM
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Hello Pete Ė

I think the Aprilaireís wiring is hidden behind its cover. Anyway, Iíll try to figure out how the two units work together and, if necessary, call the installer to confirm.

Thanks,

Jerry
 
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Old 10-28-23, 01:58 PM
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Only one should be connected.
If they wired the Aprilaire thru the duct then the Honeywell one should be disconnected.
 
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Old 10-28-23, 02:54 PM
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Thanks Pete.
I will call the furnace people and see why they installed two humidistats.

Jerry
 
 

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