Nest and HE240 Honeywell humidifier


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Old 11-22-22, 05:51 PM
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Nest and HE240 Honeywell humidifier

Hi everyone,

I installed the Honeywell HE240 humidifier and connected it to my Nest thermostat.
Using the wire provided (red and white wires), I connected one end of the red wire to the pressure switch and one to the * in the thermostat.
In the instructions, it doesn't call for the humidifier to be connected directly to the HVAC system.
The humidifier works properly, but water still flowing in even when the furnace is off. Seems like a complete waste of water.
Did I miss something in the wiring or is it just the way the humidifier works?
​​​​

Another question, when I open the valve all the way, it seems like the water pressure is too high and the feeding tube inside the thermostat is splashing all over. I just didn't open it the valve all the in the meantime. Is there a different solution?

Thank you for help.
 
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Old 11-22-22, 06:51 PM
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Welcome to the forums.

I use Aprilaire humidifiers exclusively so I'm not an expert on the Honeywells.
There is supposed to be an orifice or restrictor to reduce water flow to the media.
I'm not 100% sure how Honeywell reduces the water flow.

The HE240 has a pressure switch and solenoid on the bottom. The pressure switch is so the humidifier only operates with air flow. You supply 24vAC to the two wires and the system operates with airflow.

The OEM setup is a transformer and humidistat. You are not using that.
The nest will replace that but it does use furnace power.


You can also disconnect the pressure switch and connect directly to the solenoid but that will require a 24v relay.
 
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Old 11-22-22, 07:28 PM
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So I have two options:

​​​​​​1. Run another wire from the humidifier to the furnace.
2. Disconnect the pressure switch by connecting the two blue wires together.

Did I get it right?
 
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Old 11-22-22, 07:32 PM
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I'm not sure what you have wired now.
No... the two blue wires need 24v to open the valve. Connecting them together won't do that.
 
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Old 11-22-22, 07:45 PM
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I disconnected the wire from the humidifier to the thermostat so now the humidifier isn't wired to any power. Water still flowing, so I don't think the wiring is the problem.

Any ideas?
 
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Old 11-22-22, 08:03 PM
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If this is a brand new humidifier..... it's defective.
With no power connected there should be no water flow.
That would indicate a defective solenoid.
 
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Old 11-22-22, 08:16 PM
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Well, that sucks. I guess I'll have to go replace the humidifier.

Thank you
 
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Old 11-22-22, 08:33 PM
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I've never had a new defective valve.
Usually it take years of use before it gets clogged with minerals.
 
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Old 11-22-22, 08:50 PM
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It's brand new from the box and I didn't touch it during the installation so maybe it's a different issue?
 
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Old 11-23-22, 02:20 PM
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The solenoid valve must have 24vAC to open.
You said yours is staying open with no power connected.
That would indicate a defective solenoid.

If you had an older unit I'd say take it apart and clean it.
There should be nothing to clean on a new unit.
 
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Old 11-23-22, 07:29 PM
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Yup, it just stays open although I hear the solenoid valve clicking when the furnace turn on and off.
I'll try to call Honeywell and see if they can send replacement.
In the meantime I left the saddle valve slightly open so water are flowing through the pad but it's not crazy amount.

Thank you for your help.
 
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Old 11-24-22, 12:09 AM
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You mentioned partially closing the saddle valve. A solenoid valve of this type requires full city pressure to close when the power is removed. Try opening the saddle valve all the way, apply power to the solenoid and then remove power. Does it still remain open ?
 
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Old 11-24-22, 08:53 AM
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Yes, still open and crazy amount of water just draining.
Also, when I open it all the way, the pressure is too high and the water from the feed tube splash back from the pad.
 
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Old 11-24-22, 10:45 AM
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I know with the Aprilaire units... there is a reducer fitting in the line between the valve and the media.
It fits in the line at the valve fitting and has a tiny hole in it to restrict water flow. They restrict the water flow after the valve so that the valve receives full pressure to close properly.

I have seen these valves not close after several years of use from mineral buildup in the solenoid.
I've also seen them not work at all when the solenoid coil opens.
Never had one leak from the start.
 
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Old 11-27-22, 04:10 PM
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Update: Went to the store and replaced the faulty humidifier.

Connected the new one and everything works properly. Was definitely a defective valve.
 
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Old 11-27-22, 05:17 PM
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Good news. Thanks for letting us know how you made out.
 
 

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