Question about Aprilaire 700 Humidifier

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Aprilaire 700 operating at wrong time

I recently moved into a house that has an Aprilaire 700 humidifier. After turning it on this season I noticed excess water around the furnace. Further investigation showed that the humidifier will turn on when the furnace/blower is and is not running. I was going to just leave the blower on at all times, but the humidifier will not run when the furnace blower is switched to the ON position on the thermostat, instead of the Auto position. The humidistat R/C terminals are connected to the R/G terminals on the furnace board at the same place the thermostat is connected. Would this be an installation problem or a malfunctioning humidistat?

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  • Anonymous Dec 12, 2008

    my 760 humidifier runs even when the furnace (and blower)is off. How can I sync up the two so the 760 just runs with the furnace on?

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You want the humidifier to run in heat mode which is the r-w1 terminal on the stat.

Posted on Nov 17, 2008

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2 Answers

Aprillaire 760 leaks from the bottom left of the case. panel is new, drain is clear, all vents open in the house, the panel cage is free from excessive scale. Any ideas?


Here is a link to your humidifier http://www.iaqsource.com/article.php/my-aprilaire-humidifier-is-leaking-what-to-do-about-it./?id=35

Oct 19, 2011 | Aprilaire 700 Humidifier

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We just bought a house with an existing Aprilaire 600 humidifier. It is now heating season and we ae running the furnace. I turned on the humidifier and no water is getting to the pad.The water line is ok...


Hello,Make sure the heating blower/fan is running when you turn the dial as the humidifier might not have power if there is no heating blower operation.

Nov 06, 2010 | Aprilaire 600 Humidifier

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Aprilaire 700. It works on fan on mode but not otherwise. It's never on and the humidity reading is always way below the setting. It should turn on automatically to bring the humidity up, right?


It appears your Aprilaire model 700 is wired to only operate when your HVAC fan is operated by your thermostat. Your HVAC installer can wire the humidifier control to operate the humidifier during a heat call, fan call or to turn on the fan when there is a need for humidification. Please contact your HVAC installer to have them change the wiring.

Thank you for giving us the opportunity to be of service
Sincerely,

Brad Uselmann
Technical Support
Research Products Corporation
www.aprilaire.com

Nov 01, 2010 | Aprilaire 700 Humidifier

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House is dry though it's quite cold outside and furnace is running. Aprilaire is turned up to 35 (I have a dial, not a digital panel). the water panel is completely dry (should it be?)


unless the humidty in your home is higher then 35%. if it is then the humidifier would not run. try turning it up higher and see if it comes on. Do you hear a click in the humidistat? as you turn up the dail when you hear the click is when the humidifier should come on. Also remember your furnace must be running for the humidifier to come on. if you hear the click and the humidifier fan comes on but no water, you may have a clogged inline filter located in the solinoid valve or a bad soliniod. all parts for your humifier can be purchased from www.aprilaire.com

Feb 05, 2010 | Aprilaire 700 Humidifier

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Loud clicking and banging, A700 doesn`t work


You have a faulty humidistat

Greg Sunsetmech

Dec 13, 2009 | Aprilaire 700 Humidifier

1 Answer

Is there a url that compares all the whole house humidifiers?


go for the Aprilaire 600 but make sure they install the outdoor sensor and set it up for AUTO operation

Oct 01, 2009 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 700 using too much water-------


There is a small oriface that is installed next to the solenoid valve. It sounds like this oriface is missing. It reduces the water flow through the humidifier when it is working properly. You should be able to disassemble the solenoid fittings to check and see if the oriface is in the water line. For a "temporary" fix regulate the water pressure down by closing down on the saddle valve.
Good luck
HVAC Teacher

Feb 25, 2009 | Aprilaire 700 Humidifier

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Aprilaire 700 Humidifier not working. Can it be repaired?


turn the humidistat back up, aand make sure if is still wired up.

Jan 18, 2009 | Aprilaire 700 Humidifier

1 Answer

What should my humidifier be set at for the winter?


Hi, Jennifer:

I'm no expert, but those who are seem to agree that the first thing to check is your evaporator panel. Aprilaire recommends replacing it annually--so if you haven't replaced it recently, that would be the first step to take. Next, check the power supply to your Aprilaire unit. Turn the humidistat to 0%, and then turn it slowly back toward 35% until you hear a click at the unit. If you don't hear a click, you'll want to check that the unit is in fact getting electric power (you may want to get an electrician or furnace tech to do this). If you do hear the click, the next thing to check is whether you have sufficient water flow to your Aprilaire unit. On mine, I had to adjust my water supply saddle valve, as well as the inline valve on the discharge side of the solenoid (see prior post from this morning)--and this seemed to clear the lines and restore water flow. Once you achieve proper water flow, you will probably want to set your humidistat at 35% for winter temps of around 20 degrees F--but be sure to adjust it downward for colder weather. Comments, anyone?

Dec 13, 2008 | Aprilaire 700 Humidifier

1 Answer

After one season the model 700 doesn't turn on


clogged solonoid? clean filter and orifice

Dec 13, 2008 | Aprilaire 700 Humidifier

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