Question about Honeywell Power Humidifier: Furnace Humidifier/ Humidifier

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HOW DO I CONNECT TO 24 VAC FOR THE HUMIDIFIER TO

HOW DO I CONNECT TO THE 24 VAC --- FOR THE HUMIDIFIER TO COME ON ONLY WHEN THE BLOWER IS ON?

I FOUND THE 24V (A BLUE AND YELLOW WIRE) FROM THE TRANSFORMER, BUT CONNECTING TO THEM MAKES THE HUMIDIFIER REMAIN ON ALWAYS.

NEED TO FIND A WAY TO GET THE 24V ONLY WHEN THE HEAT IS ON.

UNIT IS A LENNOX (MODEL) G41UF-48C-110-02

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If you have 1220v eac terminals you may use those but a current sensing relay is the right way

Posted on Oct 28, 2009

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You can hook it to R and W on the board but you should really use a current sensing realy on the blower so it wont come on until the fan is running and you should also have a humidistat

Posted on Oct 04, 2009

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You didn't say what kind of furnace you have, but here is a link to what is known as an "air flow" switch that will allow the humidifier to operate only when it senses air flow through the furnace:

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The yellow wire connected to the I.D. Blower pressure switch
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When furnance turns on and the blower kicks in the fan from the humidifier does not turn on ?


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http://www.appliancefactoryparts.com/humidifiers/helpcenter/breakdowns/honeywell/honeywell-he360a1027.html
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http://www.appliancefactoryparts.com/content/pdfs/110672-4.pdf
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To me it sounds like it is wired incorrectly, the solenoid should NOT get too hot at all. The PDF above shows wiring data.

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I would like to direct wire the humidifier to the furnace so evey time the furnace goes on so does the humidifier no humidistat I have a Heil NUGM100EHA1


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I have a carrier furnace, humidifier valve popped fuse


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Aprilaire 760 keeps running.


The humidifier should not turn on untill the furnace blower starts. Since the fan stays on. does the solenoid valve also stay on? If they both stay on you probably have a bad humidistat. If only the blower stays on then the circuit bourd in the humidifier is defective.
Good luck
HVAC Teacher

Feb 06, 2009 | Aprilaire 700 Humidifier

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Water does not get to Humidifier. Goes from source to motor.


That is not a 'motor' on the side of the humidifier housing, it is a solenoid valve. The water feeds in to one side and exits the other side to a tube that feeds in to the top of the humidifier unit. The valve opens and allows water to flow when electrical power is applied to the valve

The valve electircal requirement may be either 120 vac or 24 vac. Power typically is switched on and off by a Humidistat control. The power feed to the Humidistat may come from a small transformer if the valve is a 24 vac unit, or directly from a furnace connection if the valve is a 120 vac unit. There are many variations, though.

A qualified licensed eletrician should check the power feed to the valve. If there is no power feed to the valve then he can trace back to the point of failure and correct the issue ... but he must also check for additional issues with the valve itself, as noted below.

Other possibles reasons for solenoid valve failure:

If power feed to the valve tests ok, then the coil inside the solenoid may be 'open' (bad, no continuity). The electrician can test the coil by checking resistance or continuity of the coil.

A non-electrical problem is that the valve path may be blocked by hardwater mineral build-up or other foreign material that flowed through the water line.

The solenoid valve must be replaced if either of the above is true with your valve.

Remember, use only a quailified licensed electrician!

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