Question about Aprilaire 550 Humidifier

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When I turn on the humidifier it shuts off the furnace

The furnace only shuts off when humidity drops to the level that the humidifier has to turn on.

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Some one has the humidifier hooked up to the R and W on the furnace.
1. it should be hooked up to its own transformer or to a proper low voltage terminal on the circuit board(beware there are high voltage HUM terminals) markd HUM and the other wire to C or the common.
2. You could hook the wire to W or white and C Common but I would rather see a seperate transformer since there is a possiblity this could cause solenoid chattering

Posted on Dec 16, 2009

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Related Questions:

1 Answer

What is the gallons per 24hour output capacity of this unit?


There are several variables that will determine the gallons used per 24 hour period.
  • At what humidity level do you have it set for? The higher the level, the faster consumption.
  • How much air movement is there in the are in the house/area of the humidifier?
  • How air tight is your home?.
  • How may people occupy the home?
  • Whats the temperature setting for your primary heat source?
Let's assume that everything is perfect. Your humidifier holds approximately 6 gallons of water, when completely full. The ideal humidity level depending on the outside air temperature is 40 to 50%. Once the humidity level you have it set for is reached, the humidifier shuts off. When the humidity level drops significantly, it turns back on. So, as you can see, it's difficult to come up with an exact figure. But based on if everything was perfect, about 1.5 to 2 quarts per hour or almost 6 gallons in 24 hours.

For more details on this humidifier call 1-800-546-5637.

Hope this helps you.

Rich

Feb 09, 2011 | Holmes Products Cool Mist HM3500...

1 Answer

The humidifier says "desired humidity" when turned


I would say, either the humidity level in the room is hi or the humidifier is defective, In my house the humidity is about 42% to 45% when we use the humidifier, and can drop to 30% or less if we don't, we leave in DC area,
I hope this helps.

Jan 14, 2011 | Vicks V4500 1 Gallon Humidifier

1 Answer

Our house is extremely humid and the a/c needs to be set lower to feel cooler. What are we doing wrong regarding aprilaire humidifier on our furnaces? Shouldn't they be turned off? yet the directions...


Hello
It depends on personal preferance,an air conditionner is going to remove humidity or water from the home,as water contains heat.

I would shut off the humidifier.The 40% setting depends on where in the world your located,say nevada is dry and hot so you may want a humidifier.Where florida is hot and humid so you would want to dehumidify or get rid of the humidity.

Lower the setting to 20% or just turn it off.

May 03, 2010 | Aprilaire 600 Humidifier

1 Answer

Loud vibrating noise when the furnace blower starts up.


Try closing damper slightly between humidifier and furnace????

Feb 03, 2010 | Aprilaire 550 Humidifier

1 Answer

Dry house, albeit have two april aire humidifiers


The reason you can not run your humidifier while the blower is off, is because all the humidity would condense almost immediately and rot out your duct work. If you find that the humidity provided during the cycle of your furnace is inadequate, I would suggest purchasing a table top unit, and keep it in the room where you spend the most time. So, the answer to your question is no, you can not run a humidifier while your blower motor is off. Hope this helps.

Dec 13, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 700 never shuts off


Thanks for your question,
Sounds to me like you have a bad solenoid valve in your Humidifier, this will need replaced, the solenoid is supposed to open and close when there is a call for humidity only when the furnace is running, then when the proper amount of humidity is sensed by the humidistat, then will it shut off, with the solenoid not working it will let water flow through like an open faucet, the solenoid is the componet that the 1/4in copper tubing connects to at the humidifier, has two wires running from it, you will need to shut the power off before changing this out, also shut the water off at the valve at the other end of the 1/4in copper line, or you might get soaked,please be careful when installing the new solenoid, making sure the water line connection is secure, or you will have leaks, hope this was helpful, please leave a rating, thanks again for your question,
mr.grzz

Jan 25, 2009 | Aprilaire 700 Humidifier

1 Answer

I just hooked up a honneywell whole house humidifer in my 1000 sq ft home. (last week) . i now see that the humidy has been at normal living condition. my problem now is i see i sttill go thru 15-20 gals...


Thanks for your question,
Well thats the big problem with bypass Humidifiers, they use alot of water, is yours running all the time, even when the furnace is shut down ? if it is, its wired in wrong, if not then there is not much of a solution for ya, is the humidity level in the home comfortable to where you can actually turn the house t-stat down ? if not you may want to incress the amount of humidity to be able to turn your house t-stat down, you should be feeling about 3 to 7 degrees warmer with the right amount of humidity, sorry I couldnt be more help, but thats the nature of that unit, just a little FYI, if you ever decide to try something different, may cost a bit more, try a steam humidifier, alot less water usage, its filtered, and pretty reliable too, thanks again for your question, hope atleast part of this helped !
mr.grzz

Jan 05, 2009 | Honeywell HE220A1019 Whole House...

1 Answer

Looks like my humidistat calls for coil fan and for furnace heat


It sounds like the humidifier may be improperly wired.
It's hard to solve without checking the wiring, but it seems like the humidistat is wired so that as the dial is advanced, it incorrectly turns on the fan, or furnace, or both.  The contacts of the humidistat should be wired so that they turn on the solenoid only.  Also, the power to the humidistat, to turn on the solenoid, should come on only when the fan is on.
Hope this helps!

Jan 03, 2009 | Aprilaire 550 Humidifier

2 Answers

Humidifier occasionally runs in spurts (on for 2 secs and then turns off)


It's just trying to keep the humidity level you set it at. By dropping the temperature in your home or changing the humidity level you want you can avoid this.

Good Luck.

Feb 12, 2008 | Lasko 1128 Humidifier

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