Aprilaire 700 installation wiring the transformer - lennox furnace

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Old 09-19-18, 03:05 PM
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Question Aprilaire 700 installation wiring the transformer - lennox furnace

Hi, I just bought a Aprilaire 700 automatic model and trying to install on my furnace. I have a doubt on wiring the provided transformer to the furnace.

https://i.stack.imgur.com/qAdKn.jpg

On internet, it has been asked to connect the transformer black wire to EAC terminal on the furnace and White wire to Neutral terminal to keep the humidifier running even without furnace heater running. But on my furnace I dont see a terminal tagged as EAC.
Please find the photo attachment below, could you please help me which are the terminals I must connect on my furnace to have the humidifier running even when the heater is not running.

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Last edited by PJmax; 09-19-18 at 04:22 PM. Reason: added 2 diagrams
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Old 09-19-18, 04:12 PM
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Welcome to the forums.

The supplied transformer gets connected always live if you choose to use it.
You can power the humidifier directly off the furnace.

I added two wiring diagrams to your post. The first one uses the furnace power and no transformer. The second one is using the supplied transformer. You'll notice I don't connect the automatic control to the blower. The furnace needs to be running for the humidifier to be operating.
 
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Old 09-20-18, 07:21 AM
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Originally Posted by PJmax View Post
Welcome to the forums.

The supplied transformer gets connected always live if you choose to use it.
You can power the humidifier directly off the furnace.

I added two wiring diagrams to your post. The first one uses the furnace power and no transformer. The second one is using the supplied transformer. You'll notice I don't connect the automatic control to the blower. The furnace needs to be running for the humidifier to be operating.
Hi,
Thanks for your time and Sorry could you Please clarify if my understanding is correct.

So in the first diagram without a transformer, the humidifier will operate only when the furnace is running ?

And as per the second diagram with a transformer, the transformer has to be connected to external power supply from the home and this will make the humidifier operate independent of Furnace ?

Thanks,
PR
 
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Old 09-20-18, 11:47 AM
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I only set up humidifiers to operate when the furnace is heating. Having the humidistat turn the blower on to humidify without heated air is not terribly effective and is wasteful.

My diagrams all reflect this.
 
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