Question about Aprilaire Humidifiers

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I have an Aprilaire humidifier 400 and a Carrier furnace/air conditioner with an Infinity Touch Control unit and am now confused as to what I should set it in Summer. Help

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Not easy to answer however it is highly depending on your comfort level of which you wish to have...

Posted on Apr 17, 2017

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Posted on Jan 02, 2017

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If i hook my Aprilaire 400 Manual (not auto/digital) humidifier up straight to a 24v wall outlet instead of to the furnace, will it still work correctly? Or does it need to be powered by the furnace to...


Your humidifier is a bypass type. The only voltage needed is 24vac to open the water valve. Air only flows through the humidifier when the furnace blower is running, and the wet pad will add very little humidity if the furnace is not running and heating the air before flowing through the wet pad in the humidifier.
It is best the water valve is only energized when the furnace is running. Some furnaces have a connector on their control boards labeled HUM for this purpose. Test it's voltage when the furnace is running because some will output 110vac instead of 24vac you need.

Jan 31, 2013 | Aprilaire 400 Humidifier

1 Answer

Is Aprilaire 500M suppose to turn on when furnace motor turns on?


The humidifier should turn on and off with the blower motor of the Furnace. This can be done by wiring the the humidifier to the HUM terminal on the furnace control board and then stepping down the power with a transformer. If the humidifier has it's own tarnsformer then a current sensing relay can be used by attaching it to the blower motors common wire.

Jan 13, 2013 | Aprilaire Humidifiers

2 Answers

How to install an Aprilaire 400 humidifier


Here is a installation guide http://electronicaircleaners.com/database/documents/aprilaire_400_installation.pdf

Nov 09, 2011 | Aprilaire 400 Humidifier

1 Answer

We noticed the humidity went down to 30% and I adjusted the rate to increase Now our Aprilaire 400 says to change the filter. I did that, and it still says to change the filter. The furnace runs fine....


If your humidifier is equipped with a Digital Humidifier Control with Water

Panel change indicator, after replacing the Water Panel, turn the control

knob to the "Test/Reset" position until the "Humidifier On" light blinks to

reset its timer. (Blower must be operating and HVAC calling for heat.) Be sure

to turn the control knob back to it's original setting. If the "Humidifier On"

light continues to blink, your humidifier is in Test mode. DO NOT LEAVE THE
CONTROL IN TEST MODE OR HUMIDIFIER WILL NOT OPERATE.

Jan 27, 2011 | Aprilaire 400 Humidifier

1 Answer

Excessive water usage with Carrier LBP humidifier.


hi the water runs down the pad the fan blows air across is , this controled by the stat which should control the water flow / on or off, this should be under warranty in the first year

Mar 01, 2010 | Carrier LBP 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

My furnace is not turning on what would be the problem


if you mean your aprilaire humidifier isn't working then open the cover and remove the 4 screws on the fan motor mount inside and check for voltage at the transformer input 120 volts and output 25.5 volts a.c., then check the control board wherever you have it located on the furnace or upstairs and make sure yhe humidity level is set high enough to make the unit run(you will hear the water solenoid click on the furnace below the aprilaire unitwhere the water line is if its working correctly),then check the humidistat on the outside of the building as they can go bad

Dec 31, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 550 has exploded with water


No water should not just sit there in the system. It is supposed to recirculate itself. You should really call a tech out and have them check your system.

Feb 11, 2009 | Aprilaire 550 Humidifier

1 Answer

Loud clicking, banging noise


We recently had the same problem. After cleaning both the furnace filter and the humidifier water panel, the clicking noise (electric air filter) and the loud bang went away.

Nov 30, 2008 | Aprilaire 550 Humidifier

1 Answer

Carrier SBP Humidifier is not working


I would suggest turning up the humidistat (usually located on the the return air duct to a higher setting and listening for a "click" noise on the supply valve. If you do hear a click but dont see / hear any water than the culprit is likely the valve itself.

Nov 22, 2008 | Carrier SBP Humidifier

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