Question about Aprilaire Humidifiers

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I have a lennox G40OUH furnace which has 120 volts out from the humidifier port. However, the April Aire 700A needs 24 volts. I have hooked up the humidifier port and the humidifier neutral port to a 24 volt transformer. However, I do not know how to hook up the lines from the transformer to the digital control. I have placed the leads from the transformer to the W/G and Cf locations. Is this correct?

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: No water to my Aprilair model 550.

Some sump pump have a safty switch that will not let the hum. come on if the tank is full of water, I,m not sure if this is the type that you have but make sure that the pump is pumping water. Also your humidistat have an internal switch that it should be set to bypass not to power Note: some humidifier have their own power supply the 550 dose not

Posted on Feb 09, 2009

  • 252 Answers

SOURCE: I have a carrier furnace, humidifier valve popped fuse

hook up the new transformer to the white (common) from the blower motor, and the lead from the blower motor hooked up to the heat term on the board. (just cut the wires and wire nut all three together)

Posted on Nov 18, 2009

  • 308 Answers

SOURCE: Dry house, albeit have two april aire humidifiers

The reason you can not run your humidifier while the blower is off, is because all the humidity would condense almost immediately and rot out your duct work. If you find that the humidity provided during the cycle of your furnace is inadequate, I would suggest purchasing a table top unit, and keep it in the room where you spend the most time. So, the answer to your question is no, you can not run a humidifier while your blower motor is off. Hope this helps.

Posted on Dec 13, 2009

  • 1033 Answers

SOURCE: I have no idea how

Hello, if the transformer you got with the humidifier is one that plugs into a receptacle than all you need is either a current sensing relay or sail switch. First connect one wire to transformer then connect to humidiistat then to either sail switch or current sensing relay and back to other terminal on transformer. if you use a sail switch then it will mount in the return air duct if you use a current sensing relay it will cradle the blower motors common wire. I will post a pic of both robhvac47_19.jpg current sensing relay

robhvac47_20.jpgSail switch

Posted on Feb 20, 2011

  • 1033 Answers

SOURCE: Have a aprilair 550 for some time. Installed a new

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.

Posted on Aug 23, 2011

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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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The display is on only when the furnace is burning gas and the blower is on. Is thisthe normal operating mode?


Is Sound like your R and C term are beeing power from the heating side of the furnace board. It need a 120 to 24 volt transformor to give the hum stat a constant 24 volts. See if that helps

Nov 04, 2010 | Aprilaire 400 Humidifier

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Do I need a transformer if my furnace has HUM port


Yes you still need a transformer the hum. port on the furnace goes to the 24 volt transformer. one leg of the primary side goes to the transformer and the other leg of the primary goes to the neutral on the board. Then you have your 24 volt terminals one goes directly to the humidifier and the other goes to the humidistat the other wire from the humidifier goes to the humidistat.

Jan 25, 2010 | Honeywell HE260A1010 Whole House...

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Dry house, albeit have two april aire humidifiers


The reason you can not run your humidifier while the blower is off, is because all the humidity would condense almost immediately and rot out your duct work. If you find that the humidity provided during the cycle of your furnace is inadequate, I would suggest purchasing a table top unit, and keep it in the room where you spend the most time. So, the answer to your question is no, you can not run a humidifier while your blower motor is off. Hope this helps.

Dec 13, 2009 | Aprilaire 700 Humidifier

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HOW DO I CONNECT TO 24 VAC FOR THE HUMIDIFIER TO


you can hook it to R and W on the board but you should really use a current sensing realy on the blower so it wont come on until the fan is running and you should also have a humidistat

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Water pours out the tube from the lennox humidifier


A small discharge of water coming out of the bottom of an April Aire drain spud is normal. This feature constantly tries to rinse the system. This helps to prevent the possibility of mold or bacteria accumulating in the unit from standing water. It may appear to be alot of water. But be reassured that you are breathing in cleaner air. Now if it continues to drain constantly even when it is turned off then you should repair the unit.

Apr 04, 2009 | Aprilaire 550 Humidifier

1 Answer

How does transformer hook up


if you just replace the unit and it is working, no your do not need the tranformer. The unit is getting power from the furnace. For reference though. The black and white wires are your 120 volts. Black hot, white common. the 2 screws are your 24 volts

Nov 25, 2008 | Honeywell HE260A1010 Whole House...

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


I logged on to the April Aire website and found the wire diagram i needed.
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Aug 18, 2008 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 600


If the water is always on make shure the 24 volts is hooked up to 24 volts only when the blower is on. Some furnaces have a HUM terminal but make shure it is 24 volts some are 120 volts you must use the transfomer with the AP 600. You may may use a RP50 relay. The setting 5 or 6 is about the avg setting slowly turn down to see if it shuts off .Also make shure the damper is in the winter setting. Hope this helps

Jan 26, 2008 | Aprilaire 600 Humidifier

2 Answers

My aprilaire 600 humidifier stays on when the blower shuts off


Make shure the 24 volts is hooked up to power that is only powered up when the blower is running. Some furnaces have a HUM terrminal on control (make shure the HUM is 24 volts some are 120 volts then you must use the transformer supplied with the AP 600). You can use a RP # 50 relay that senses current only when the furnace motor is running on the heating speed. Hope this helps

Oct 30, 2007 | Aprilaire 600 Humidifier

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