Question about Aprilaire 700 Humidifier

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Wire schematic for watre feed humidifier to furn

Can you explain how to wire a water feed humidifier to a furnace? Or where can you find a wire schematic to wire a water feed humidifier to a furnace. Thanks

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  • Aprilaire Master
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Hi google your humidifer you can get on line manuals to down load

Posted on Feb 05, 2010

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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

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Have a aprilair 550 for some time. Installed a new Lennox G61MP furnace and the technitions failed to reconnect the wiring that powers the humidifier. Need wiring schematic. Does humidifier transformer get...


Hello, yes the transformer will get a 120 volts from the Furnaces control board, there should be a terminal labeled HUM on the control board. You need to bring 2 wires one from HUM and one from a nuetral tap on the board to the line side of the transformer, this way every time the blower motor on the Furnace turns on the humidifier will aswell.

Aug 23, 2011 | Aprilaire 550 Humidifier

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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

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We just bought a home with this humidifier installed on the furnace. There's no activity when the furnace is running. The water is connected but does not flow. Could this be a transformer problem? We guess...


Could be a couple of things. Transformer can be bad. Try connecting the two wires (usually wired red and white) from the transformer to terminal W and C on the circut board. Your bypassing the transformer and if installed a current sensing relay. The furnace transformer will/should handle the extra load. Turn on the furnace, if still not working, loosen the water supply line at the water solenoid on the humidifier, if water flows out then your supply valve isn't clogged, if no water then try screwing in the needle on the supply valve all the way in then back out. If still no water then the valve is clogged. If all is good then it looks like the water solenoid is bad or wiring to valve/humidifier control. Don't find the controls bad that often. Have fun!

Nov 28, 2009 | Honeywell HE260A1010 Whole House...

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Need blower motor schematics and / or schematics for a york Controller #031-01267-001


you will need the model of the furnace not the part # of the board. is the schematic not in the unit?

Sep 25, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

My honeywell humidifier is using water at 2 gallons an hour


Furnace mounted humidifiers "should" be wired so that they are only running when the furnace blower is on. When the furnace is off so should the humidifier. If it is wired proper, it is possible that you have a bad solenoid valve. It could be stuck in the on position. If it is bad these valves can be expensive. If your humidifier is newer, fix it. If it is old you are probably better off to just buy a whole new unit.
Good luck

Mar 23, 2009 | Honeywell HE365 Humidifier

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Hooking up a used 550 to a new 80% trane UD-R9V,


In this situatioin you'll eed a second transformer 110volt to 24 volt to relay from w to common to operate only when furnace being called for.

Feb 07, 2009 | Aprilaire 550 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 model 760


It could be that the humidistat is not calling for humidity. Make sure that you have the dial turned up all the way (as far as it will go, just to test it) and that the blower on the furnace is running - if the unit is properly wired, the water will not run unless the blower on the furnace is running. This should do the trick. If not, the only other thing would be a bad humidistat. Good Luck!

Dec 14, 2008 | Aprilaire 550 Humidifier

1 Answer

Turning on the humidifier shuts off the furnace


It is possible you may have wired it wrong. Make sure your humidifer is not robbing power from your thermostat. This would explain when your humidifer makes a demand to come on it robs power from your t-stat making it lose its call for heat. Wire your humidistat to the "w" terminal and the common terminal so it only runs on a call for heat. With the bypass type of humidifier you purchased it wont do you any good to run when the heat isn't running anyway. If you want an independent operation humidifier you need a steam type.

Dec 02, 2008 | Aprilaire 600 Humidifier

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