Aprilaire 700 / Furnace / AC - Wiring Help

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Old 01-05-19, 05:25 PM
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Aprilaire 700 / Furnace / AC - Wiring Help

Evening everyone,

I have a Central AC that installed on my furnace. I recently purchased a new Aprilaire 700A humidifier for my house as the old humidifier was shot when we moved in last year. Its cold here and dry and I want to get it installed. I am using an Ecobee thermostat.

I don't want the humidifier running when my Air Conditioner is on of course in the summer time. I've attached a the wiring diagram that came with it, however added in how my Air Conditioner is currently installed (2 wires already going to Y & C). Those two wires appear to run to the outside of the house. Currently the G wires go from the thermostat to the furnace, I'd be transitioning them to the way the diagram calls for though during the install.

Questions:

1. If I wire it as shown, will it work and call for humidity only during the heating cycle? I currently have the breaker outside for the AC off, and during the summer I switch the Ecobee to cooling only, and in winter I have it on heating only.

2. I need to install a new plugin near the furnace for the fan on the humidifier. How should I wire in the 24AC Transformer?

a. Can I pull power from the 120VAC that is powering the furnace?

or

b. Should I pull power for the transformer from a different source such as the new electrical box I have to install anyway?

Thanks!

 
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Old 01-05-19, 05:52 PM
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Welcome to the forums.

Do you want the Ecobee to control your humidifier ?
If yes.... you will need one spare wire between the thermostat and furnace.
You would not need the transformer or the new humidistat.

Your diagram shows tying in to the G wiring. That's only needed to be done if you want the humidistat to turn the blower on for you without a call for heat. I normally wire my humidifiers to only run with the heat.
 
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Old 01-05-19, 05:59 PM
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I'd prefer the humidistat to control it as its an automatic one with the sensor that I have to run outside. So I am assuming I would still run the G the same way, that way it only runs the humidifier when there is a call for humidity?

The way this is wired, will it affect the AC at all?
 
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Old 01-05-19, 06:43 PM
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No.... it will not affect A/C. You would need to shut the humidistat off in the summer so that it doesn't turn the blower on and start humidifying in the summer.

The 700 and the extra transformer use very little power and can be connected anywhere for 120v.
 
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