Question about Aprilaire 550 Humidifier

1 Answer

Water keeps running into humidifier even furnance blower is not

Aprilaire model 550 with manual controller. Water continues to flow to humidifier even furnance blower is not running. I can stop it by turn humidity control down, then water stops flowing even furnance is on.
tried power off furnance, then no water flow at all (of cause)
What needs to be fixed?? soleniod problem? bad electric wiring??

thanks

Posted by on

  • 1 more comment 
  • 30all Mar 07, 2009

    Ha, I finally fixed the problem of continuing water flow to humidifier even furnace blower is not on. After searching and studying around on-line. I found the transformer was hard-wired in junction box of furnace, and there is no relay sensor. It was installed by "professional contractor'" from Air Group in NJ in the first place years ago. Since my Trane XE79 has HUM connection, I re-wired transformer to it, problem solved.
    Can we trust any contractors in these days??


  • cholden Mar 08, 2009

    Aprilaire 550 Humidifier- 5.5 yrs. old, worsening constant flow through the humidfier. All worked great for first 2 winters, water now flows freely through humidifier when furnace not blowing if humistat is set above 5%. last winter I had to go from 15 to 10%, yr before that- 20% was the max. The first 2 years I could set the humistat according to the outside temp., as it should be.
    Problem not related to outside temp, or flow of water INTO the humidifier.
    I don't know whether to try to replace (or clean?) the solenoid or humistat first.... or call a repair person. Items are in a condo that was gut rehabbed- my inspector found that the solenoid was not working, it was replaced (still have the original one, new but disfunctional at the time, right here)


  • 30all Mar 09, 2009

    I replaced humidid control in my first try, did not work. but I left the new one in because the old one was dirty anyway. The new control panel will not fix the old one (too small), I had to gut the old one and replaced only inner parts. now I have a useless new stat frame and cover.

    I tested solenoid by disconnect wires to it, water stopped. I don't think it's it. so I decided to make sure the wiring is correct before spending another $50. btw, I was pretty knowing nothing about how furname and humidifier are wired together before this.

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

This sounds like, the 550 transformer is not connected to the blower motor power connection (in parallel)

Posted on Mar 04, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

The water willnot stop running after the heater bloweer shuts off


Typically when the water continues to run after the blower cycle stops, the solenoid valve is stuck open and will need to be replaced.

Nov 25, 2012 | Aprilaire 550 Humidifier

1 Answer

Aprilaire550


Did you just install this unit, or has it been working for a while and just stopped?
1. If you just installed it, the solenoid wires (yellow) must be hooked up to switch in when you have a call for heat.
a) use a current sense relay OR
b) connect 120V & neutral to "HUM" terminal and neutral on heater control board.
2. If it has worked before, maybe the saddle valve is plugged. Turn the "T" handle all the way clockwise, then all the way out CCW. You can hear the water start flowing. Loosen compression fitting at solenoid valve to make sure water is getting there.
3) Also, you must supply 24V to the circuit to open the solenoid valve. Check your wiring. It depends on the model what way to wire it and I cannot go into that here.
4) Testing: Turn off humidistat control. Turn on heat, wait for blower to come on. Turn humidistat control to test posn. Solenoid valve should click. This will put water into top of Aprilaire tray, after few minutes it will dribble out bottom clear vynl tube to the
drain.

Jan 29, 2008 | Aprilaire 550 Humidifier

1 Answer

My aprilaire 550 water solenoid is constantly clinking on and off while the furnance is running. What could be the problem


Hello, check for any loose wiring between the solenoid and transformer this usually causes the solenoid to click on and off.

Feb 18, 2011 | Aprilaire 550 Humidifier

1 Answer

What controls how much water flows into an Aprilaire 550? It was fine until a couple of days ago. I replaced filter, but it still appears to be too strong. It not only runs out the drain tube but is...


In the water line where it connects to the solenoid is an orifice. You can install a smaller plastic orifice or you can install a manual feed valve to where you can control the flow.

Feb 12, 2010 | Aprilaire 550 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

How much water should be draining from Aprilaire 550?


thats too much.. and a waste of water... you should install a good ball valve water shutoff inline and let it trickle.. ideally, it should be net zero water wastage but there's always a bit.. my water take-off drain runs about once every 5hrs and its about a litre (its siphoning water out of the combustion chamber as well as the waste water from the humidifier.. (you can get those ball valves at homedepot for about 6bucks -- they're usually compression fittings as well)

Jan 11, 2010 | Aprilaire 550 Humidifier

1 Answer

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

Jan 08, 2010 | Aprilaire 600 Humidifier

1 Answer

My Aprilaire 560 doesn't shut off even if the blower is off.


My Aprilair 560 turns on and off repeatedly.Making a loud banging sound.Changed my water valve worked 1 day and started agin.

Dec 20, 2009 | Aprilaire 550 Humidifier

1 Answer

How do I know if my Aprilaire 550 humidifier is working?


Should the water flow through the water pannel al the time the blower is running?

Nov 27, 2009 | Humidifiers

2 Answers

Orifice clogs to Aprilaire 600


http://www.aprilaire.com/themes/aa/en/manuals/600a.pdf look at page thirteen in this manual there is allready a inline filter on the unit. hope this helps

Jan 06, 2009 | Aprilaire 600 Humidifier

Not finding what you are looking for?
Aprilaire 550 Humidifier Logo

2,003 people viewed this question

Ask a Question

Usually answered in minutes!

Top Aprilaire Humidifiers Experts

paulcarew

Level 3 Expert

1904 Answers

Ken Thomas

Level 2 Expert

118 Answers

Mack Baxter

Level 3 Expert

379 Answers

Are you an Aprilaire Humidifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...