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How to wire crawl space exhaust fan, fresh air fan with a dehumidistat

How to wire crawl space exhaust fan, fresh air fan with a dehumidistat

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  #1  
Old 04-29-16, 06:25 AM
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How to wire crawl space exhaust fan, fresh air fan with a dehumidistat

Hey there, I have a crawl space in an apartment building that has a fan to bring in fresh air in and a damper/actuator with an end switch controlled by a dehumidistat when the humidity gets past a certain percent. I'm just not 100 percent sure how to wire it all to work. Any help would be great!

Thanks
 
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Old 04-29-16, 08:43 AM
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We need a lot more information: what wires do you have on each device? what voltages are each device? do you already have a circuit or does a new one need to be installed? can you post some pictures?
 
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Old 04-29-16, 09:18 AM
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Sorry. It's all 120v. So apparently how it's suppose to work is once the humidistat is over whatever it is set for it would open a damper/w the actuator with an end switch and then that would turn on the fan to bring fresh air in.
 
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Old 04-29-16, 10:08 AM
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As previously posted by ben:
what wires do you have on each device... can you post some pictures??
http://www.doityourself.com/forum/li...rt-images.html
 
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Old 04-29-16, 01:31 PM
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I haven't pulled any of the wires just yet.
 
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Old 04-30-16, 06:39 AM
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Anyone please??

Thanks
 
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Old 04-30-16, 10:08 AM
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Anyone please?
We are waiting for you to answer our questions. We know nothing about the humidistat or damper till you tell us about them. At least give us the make and model number.
 
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Old 04-30-16, 11:17 AM
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I'm sorry, I don't know the exact models yet. Just that it's a 120v humidistat and the damper/actuator is 120v with an end switch. It will have a dedicated circuit for this.
 
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Old 04-30-16, 12:00 PM
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When you get the info we will be glad to help you.
 
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Old 04-30-16, 04:35 PM
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I just wanted to rough it in already. I think it shouldn't matter what model they are. Just not sure how to wire it all to make it work
 
  #11  
Old 04-30-16, 07:21 PM
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The humidistat just acts like a switch so the neutral just carries through. The fan with have a disconnect switch, it's 120v. I don't have the actuator yet. Thanks
 
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Old 04-30-16, 11:09 PM
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I'm not so sure about using a humidistat to bring in "fresh air". How do you know the air coming in is lower in humidity then what's already in the crawl space ? It could be raining outside and bringing that air in would increase the humidity. The humidistat would keep cycling as the damp air came in.

Here's the basic wiring I think you'd follow...

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Old 05-01-16, 07:30 AM
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here is how it will be laid out
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Old 05-01-16, 10:04 AM
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Ok.... and how do you plan on running the wires. I have drawn you an operating diagram that I think will work for you as we haven't been given any particulars on the louvers and end switch set up.

Yes...you need a two wire feed from the panel. Where are you bringing power to ?
Describe in words what you want to do.

I would take a two wire cable from panel to humidistat. Then a two wire from humidistat to louver/damper combo. Take a two wire from the louver to the fan. All that would be two wire cable with ground. There are several way of wiring it using less wire with three wire cable but slightly more confusing.

Same drawing.... just spread out. Also added mandatory service switch at fan location.

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Last edited by PJmax; 05-01-16 at 10:23 AM.
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Old 05-01-16, 08:19 PM
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Thanks for helping me out!
 
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