Furnace/Humidifier question

I just purchased a new humidifier (attaches to the furnace). Do I wire it from the blower and if so, how do I know what wires to attach from the blower to the humidifier? It's a mess of wires in there!
I wired it from the switch straight to the humidifier. It works but continuously flows water. I assume this needs to be wired to the blower but I want to be sure I wire it correctly.
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I do not think it gets wired to the blower simply because if you just turn your fan on at the thermostat, the humidifier will constantly be on. On my furnace, the humidifier kicks on only when the heat is on, but once the heat has been satisfied and the gas burner kicks off, the humidifier also goes off, even if the fan stays on. I do not think the humidifier will do it's job correctly if just the fan is on and no heat passing through it. On my Trane XR 80 furnace, the humidifier is hooked up to the C and Y terminals on the board. This is not to say you furnace is similiar, but just to give you a reference. What does the instructions say that came with the humidifier when you purchased it?
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Best thing to do is purchase a current sensing realy OR get a "sail" switch.
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Best thing to do is caulk the house and trash the humidifier.
Nick
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snipped-for-privacy@gmail.com wrote:

What do the instructions say???? I suggest you follow the installation instructions. Different humidifiers may need different installation.
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Joseph Meehan

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Part of my problem is that the installation instructions that came with the humidifier are extremely vague. They don't tell me anything.
I bought a Honeywell Humidifier, and for $70 more, I could have purchased the installation kit to go with it. I didn't need any more parts except the installation kit comes with a video tape installation instructions.
I couldn't justify spending the $$ for a video tape.
Anyway, since I have it wired directly from the power source to the transformer to the humidifier, the humidifier will run all the time, whether the furnace is on or off. That is why I thought the wiring needed to be changed but I am still confused.
Help!
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You sure the install kit didn't include a current sensing relay, or a sail switch?
How a specific unit should be wired will vary. But in general, there are several options:
1 - Wired direct to go on when the blower turns on
2 - Wired direct to go on when the burner is on
3 - Wired using a current sensing relay to go on either with the blower or burner
4 - Wired with a sail switch to go on with the blower.
Whic option is best depends on the furnace, the humidifier, and how easy/hard any of these options is for that particular install.
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You say it runs all the time, do you mean it pours water. Humidifers for forced air do not need the wasted cost of running a fan, air blowes over an evaporator pad.
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snipped-for-privacy@gmail.com wrote:

I don't think I would want a product like that from a company that did not bother to provide installation instructions. I wonder what other shortcuts they took.
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Joseph Meehan

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On 16 Oct 2005 19:05:25 -0700, snipped-for-privacy@gmail.com wrote:

to sense humidity?
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"Isn't there some sort of controller which mounts in the living area to sense humidity? "
Most have a humidistat that mounts on the return air plenum. But that doesn't solve the problem of having the unit only turn on when the furnace and/or blower are running. The humidistat is just another on/off that will only turn it on when the humidity in the return air is below the set point.
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I have determined that this will need to be wired to either the blower or the burner. Since I am new to this, I am assuming this can be done?
What it is doing now is when the furnace is on or off, the water continues to flow through the pad into the drain hose, non stop.
Can anyone easily explain how to wire this up?
By the way, there was an existing humidifer on the furnace but I made a mistake and forgot to label how it was installed when I removed it.
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On 17 Oct 2005 14:46:21 -0700, snipped-for-privacy@gmail.com wrote:

Does it use 24v, 12v or 120v?
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snipped-for-privacy@gmail.com wrote:

You need to know what voltage it needs (generally 12 - 24 or 120V) and what amperage it needs, then you need to find a switched source with sufficient excess capacity for it or use a relay to reduce the load.
The more I think about it, the more I think you should junk this thing and buy a good humidifier like Aprilair.
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Joseph Meehan

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On Tue, 18 Oct 2005 10:32:54 GMT, "Joseph Meehan"

I see you are back spreading misinformation again Mr. Meehan. he already got the proper advice but you are of course wrong again!! +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ spam protection measure, Please remove the 33 to send e-mail
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Check out the Aprilaire 600. It has a control that mounts on the furnace. The more expensive Aprilaire 700 ( I believe it is) has a unit that mounts by the upstairs thermostat. I don't mind going down stairs to my furnace to adjust it. I just set to around 45% and forget it till Summer.

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NickySantoro wrote:

I believe most just sense the air in the return duct, but some units do not have one.
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Joseph Meehan

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