Question about Aprilaire 700 Humidifier

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Water for my Carrier humidifier HUMCCSBP2212 runs when furnace turns off but will shut off if I lower the humidistat.

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  • Bryan H Dec 04, 2012

    Note: It runs with the furnace on or off, the only way to shut it off is to lower the humidistat. Then I hear a click and the water stops flowing

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  • Aprilaire Master
  • 1,033 Answers

Is this a newly installed humidifier?

Posted on Dec 04, 2012

  • 2 more comments 
  • Bryan H Dec 05, 2012

    No. I just moved into the house a yr ago and this is the first time I used it.

  • Bryan H Dec 05, 2012

    No. I just moved into the house a yr ago and this is the first time I used it. The unit is about 6the yrs old.

  • Robert Dec 06, 2012

    The unit needs a current sensing relay attached to the blower motors common wire in order for the humidiifer to turn off and on. When the blower motor is energized the humidifier will turn on and when the blower is denergized the humidifier will turn off.

  • Robert Dec 06, 2012

    Here is a link for a current sensing relayhttp://www.filtersfast.com/P-GeneralAire...

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Posted on Jan 02, 2017

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JMuskovitz
  • 135 Answers

SOURCE: Aprilaire 760 Humidifier water continues to run

You need to determine whether the problem is in the solenoid or in the furnace electronics. You could put a voltmeter on the solenoid connection to see if the furnace is still holding the solenoid open after the blower stops. This will tell you whether it is the solenoid or not.

Posted on Feb 19, 2007

  • 2 Answers

SOURCE: aprilaire 600 humidier: water continuously runs

sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Posted on Jan 13, 2010

  • 118 Answers

SOURCE: Loud vibrating noise when the furnace blower starts up.

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

Posted on Feb 04, 2010

heatman101
  • 43501 Answers

SOURCE: This regards an Apriaire 700 that was installed

Hi,

You are absolutely thinking correctly....the humidifier should be running when ever the blower is running and the humidistat is not satisfied...in fact in some cases I have advised people even turn the fan switch on to run the blower longer to get more humidity in the air if needed....some furnaces do not have long enough run times to get enough water evaporated...

You have the idea of how it needs to go, so you should just go ahead and wire it up that way and you'll be glad you did!! You can get a relay for a few bucks and have a much better working system...


heatman101

Posted on Jan 24, 2011

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1 Answer

I have a Carrier humidifier model #HUMCCLBP2217-A. It appears to be working, but every time it shuts off it emits a very loud "thump". The noise is loud enough to wake me up at night. I have...


Do you feel like looking at the humidifier yourself?
You can open the door on the unit, while the furnace is running--
The humidifier is usually installed in the return air duct, so there will be a sucking of air into the open door, when you open it.

There is usually a large wheel, with a wet pad wrapped around the circumference.
This wheel rotates slowly, and picks up water from the sump-- does everything look and sound quiet as it runs? -- The float valve has to open and close, to c ontrol the leve of water in the sump-- (The pool of water the wheel runs the mat thru--
Possibly the valve shutting off, could make a plumbing BANG-- you could duplicate that, by lifting the float mechanism and stopping the water-- does that make the noise?

If you can reach and operate the Humidistat control from near the humidifier, do so a few time-- or Have someone cycle the humidistat a few times, and you listen for that sound--
Is it in the humidifier itself, or the duct work nearby?

It might be that the humidistat wheel scrapes against the side of the sheet metal duct work? -- Sounds travel a long ways in metal duct work!

Let us know if this helps

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Hope this solves your problem, look for the humidistat, it should be located on cold air return duct near furnace, make sure it is not set in the on position, if it is, then this is why it is staying on, please set humidistat any where from 20 to 35%, never over 40%. If the humidistat is set properly and is still running, you may have a electrical problem, humidifier circuit should only receive power(24 volts) when the indoor blower motor of furnace receives power, also if you have galvanized plumbing in your home, you may have a piece of rust or lime deposit in the humidifier solenoid valve preventing it from closing, turn water off to humidifier and disconnect water supply line entering solenoid valve inspect & clean protector screen. Good luck.

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