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Can you wire a 760 automatic to a700m manual - Aprilaire 700 Humidifier

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  • Richard Pazer Dec 28, 2013

    Hi Richard Pazer, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box?

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Aprilaire 760 keeps running


Is this a newly installed unit it sounds as if there's a wiring issue. Could you show a picture of the wiring terminals. If this is not a new install try turning of your furnace fan.

Nov 02, 2014 | Aprilaire 700 Humidifier

1 Answer

How do I know my aprilair 760 humidifier is working?


A simple check you can perform on your aprilaire 760 is the following:
1) locate the two brown wires coming out of the 760 (these wires will be wired to tell the 760 to turn on when the hvac bower is on and the humidistat is calling for moisture).
2) temprarily disconnect the two brown wires from the external wiring and then short the wires together. All you're doing here is bypassing the your thermostat and bower-on indicator.

With the 70 unit plugged in to the wall outlet and the two brown wires connected together, both the fan and the solenoid valve (water inlet valve) should both be activated.

Dec 13, 2009 | Aprilaire 700 Humidifier

1 Answer

When calling for heat and humidity I have 24v at the brown wires going to my Aprilaire, but the solenoid doesn't pick. Is it the control card or solenoid? Both are mounted on the Aprilaire unit. I have a...


If you have 24 volts to the solenoid, then it's not the control card. It's either the solenoid or there's an orifice in the water line at the solenoid that sometimes stops up. To check the solenoid you need to disconnect the power to the system and disconnect the solenoid wires (the two brown wires) and ohm the solenoid. If you get a low ohm reading around 50 ohms or then the solenoid is good and you need to check the orifice. If the ohm meter doesn't move when you ohm across both leads then it's the solenoid and it needs replaced.

Nov 24, 2009 | Humidifiers

1 Answer

I have a manual control and I want to upgrade to automatic control. What do I need and how expensive can be(parts & labor)?


If I'm not mistaken, the 600 has a automatic or manual control built in to the same humidistat. The only thing required is the outside air sensor (oas) be mounted outside and wired into the humidistat. Don't forget to remove the "manual" jumper from the humidistat.

Oct 03, 2009 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 760 furnace humidifier makes a loud screeching sound.


A bad circuit board should not make any noises. A bad solenoid valve could make a loud buzzing noise. If the noise is a squealing noise then you have defective bearings in the blower motor.
If you disconnect the low voltage wiring from the solenoid valve and you still hear the noise, then its not the solenoid valve.

Apr 06, 2009 | Aprilaire 700 Humidifier

1 Answer

Water runs when furnace is off, but stops when furnace is on.


the 760 humidifier does not need a transformer wired externally. the 760 has its' own 24v transformer inside the fan compartment. this transformer will provide the power to enrgize the water solenoid as needed. it sounds like to me the additional trasnformer is hot all the time. when the furnace comes on, the unit gets power and the internal transformer is cancelling the power from the external transformer. this would explain why it quits running when the heat is on. since the external transformer is hot all time, when the heat shuts off, the solenoid is getting energized by the external transformer. to make this run correctly, you need to get rid of the external transformer. leave the humidifier high voltage wires hooked up so they are only hot when the furnace runs. if you have a humidistat that has a r and c terminal, you will need to wire these directly to the r and c on the furnace control board and move the switch inside the humidistat to "power". make sure it is not on "bypass". then wire your 2 brown wires from the humidifier to each of the "h" terminals on the humidistat. if you have a humidistat that only has 2 terminals, wire one brown wire to each of the terminals. this should allow it to run properly.

Jan 28, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 760 humidifier. no power to humidastat


the 760 send power out the humidistat is just a switch if you touch the two brown wire coming outof the 760 the humidifier should come on if it doesnt and you had appiled power to those wire you probably shorted the 760 control board

Jan 15, 2009 | Aprilaire Humidifiers

1 Answer

Model 760 Humidifier - need wireing diagram please....


I logged on to the April Aire website and found the wire diagram i needed.
they have really good information on all their units. thanks.sc.

Aug 18, 2008 | Aprilaire 700 Humidifier

1 Answer

Lots of water run-off from Aprilaire 760 Humidifier


HI would check the filter in side might need changing or cleaning clean out wter tray in side, it could be just a blocked filter , hope this helps

Jan 03, 2008 | Aprilaire 700 Humidifier

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