Question about General Filters Humidifiers

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I have a old General 1040 Power humidifer on the side of my Frigidaire Furnace model70-80-90s

How do i hook it up to my furnace ? and what do i need ?.and the wiring diagram on how to do it.

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 290 Answers

SOURCE: he 260a wiring w/humidistat

try this forum...there are wiring diagrams posted there:
http://forum.doityourself.com/humidifiers-dehumidifiers-130/

Posted on Dec 12, 2008

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machtcl1
  • 61 Answers

SOURCE: wiring problem

Sounds like you may have put 120v through a 24v solenoid and humidistat.
Is the HUM terminal on the furnace 120v or 24v?
If it is a 120v terminal you will need a 120x24v transformer and a new solenoid and maybe a new humidistat.

Posted on Jan 02, 2009

  • 1 Answer

SOURCE: loud noise

Replace the water valve... It"s vibrating when closing. Do you have hot water feeding the unit?

Posted on Jan 26, 2009

  • 11 Answers

SOURCE: Aprilaire 550 doesn't seem to be getting power

See if you have a screw marked EAC This to power an Electronic Air Cleaner unlike the HUM it also gets 120VAC only when the fan comes on. Not sure what make of furnace you have but if your heat is working OK don'tn change the control board the can be very expensive. there are other ways to wire humidifiers without using the HUN screw

Posted on Feb 09, 2009

  • 24 Answers

SOURCE: where can I get a wiring diagram for an HEIL 5000

google it.

Posted on Jan 24, 2010

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1 Answer

2005 Aprilaire 700 humidifier. Replaced a non-working circuit board. Now, the humidifier works fine when the furnace is running. It starts and stops as it should based on humidistat setting. Problem: ...


It sounds like it is just miswired. The low voltage wiring off the humidistat should be on W and C on the circ. board at the furnace. If you have it on R and C then it will power it constantly regardless if the heat is running or not. W is only energized on a call for heat which is typically when you want that type of humidifier to run

Feb 02, 2013 | Aprilaire Humidifiers

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I just installed a Honeywell HE 360 Humidifier I purchased at Home depot. I replaced a Aprilaire model 110 . I have a 120v power duplex that is hot with the furnace blower motor, on so I assumed the sail...


Hello, in order to turn your humidifier on with the furnace the 120 volts coming from your humidifer you must hook it up to a step down transformer, then the transformer will provide 24 volts to you humidistat and solenoid valve. So you need a wire from the HUM on your control board to transformer primary side and a wire from neutral on the board to primary side of transformer. Then you need low voltage wire from secondary side of transformer to humidistat from humidistat to humidifier.

Feb 20, 2011 | Honeywell HE360A1027 Whole House...

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I hooked the humidifer up and water keeps running it dose not stop when furnace stops. What might be wrong?


Hello, this could be tw o different things. when you install a humidifier you need a means of turning it on and off with the furnaces blower motor, this is done by either a sail switch, current sensing relay, or by the transformer being hooked up directly to the furnaces control board. if you do not have one of those three than the humidifier will run continuously untill u manually turn it off at the humidistat. If you have one of those three installed already than the solenoid valve is stuck and must be replaced.

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My aprilaire 700 isn't coming on (no water flow). The front part of the unit has fallen off the furnace twice (held on by plastic nubs/slots...) and blew the furnace fuse/ and circuit breaker probably...


Check for voltaged at the solenoid valve. This will either be a 24 volt or 110 volt solenoid valve. Confirm power into the unit 110 volts. If you have power into the unit and no voltaged at the solenoid valve on a call for humidification at the humidistat than the circuit board or the step down transfgormer has failed.. If you do have voltage at the solenid valve than the valve has failed.

Jan 26, 2011 | Aprilaire 700 Humidifier

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Why two 24 Vac on aprilaire 700's control unit?


Okay, I looked up the installation manual online to see exactly what you are working with.
Yes the R anc C need to be hooked to the transformer supplied with the unit. The primary 120v side needs to be hooked into the power coming into the furnace. this can easily be done were the L and N get hooked into your furnace or circuit board on the furnace. This will provide the contiuous power to the unit. Preferably you will hook this after the door switch of the furnace so that you will kill the power toit if you take the blower door off.
The ODT terminals are for the outdoor sensor if you want to hook that up it will vary the humidiy in your home according to the outdoor temperature then.
Now the W/G and Cf terminals. If you have 24v coming from the HUM terminals of your furnace you DO NOT need a second transformer. You must check your furnace manual or check the voltage to them with the furnace blower energized. The HUM terminals will only have power to them when the blower should be running.
If the HUM terminals are 120v then you need to get another transformer and hook up the primary side to the HUM terminals so it is powered only when the the blower is running. Hook the secondary side to the W/G and Cf terminals.
So bottom line is that you need to figure out what voltage your furnace is giving to the HUM terminals and then go from there. Some times the EAC terminals or the ACC terminals will be 24v on the furnace board. Either of them could be used also, as they are only energized when the blower is running also.

Heatman101

Jan 25, 2010 | Aprilaire 700 Humidifier

1 Answer

My forced air central humidification system does not work


you need tocheck for power at solinoid valve or continuity of valve where water enters the unit. THe furnace must be on and humidistat calling...

Mar 12, 2009 | Humidifiers

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Continous water flow on a 1042lh humidifer


theholts220 - Sounds like they needed to install a bit larger transformer . You can also buy a A 50 Sensing relay that attaches to the wires for your motor and when you turn on the furnace it will allow the power to go to the humidistat. Very strange though they do not use a lot of power. Check and make sure the wires are not pinched or touching metal somewhere.


TLuzzo - The humidistat seems to be working when you turn it down. The wires for the solenoid should be hooked up to your furnace circuit board. The instruction manual will tell you where. If you dont have a spot on your circut board the A 50 sensing reley is they way to go. They are inexpensive

Jan 24, 2009 | General Filters 1042-LH Humidifier

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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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Loud noise


Replace the water valve... It"s vibrating when closing. Do you have hot water feeding the unit?

Oct 22, 2008 | Aprilaire 550 Humidifier

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You can try installing the water line to your hot water if it is installed on cold line for more humidification. You should make sure your humidistat is up line 6" @least from humidifier for proper humidification measurement.

Feb 26, 2008 | Honeywell HE220A1019 Whole House...

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