Wiring help w/HE260A

I am going to install a HE260a on a Comfort N8MPN07581281 (heat and ac unit in one). I am going to hook the 260 on the return side and hook the 6" tube to the supply side. I did not pick up the install kit given it costs $75 (and thus the wiring instructions).

What I am not sure is how to wire it up. I just want the humidifier to run when the heat is on (for now) and I am not going to use a sail switch. On my control board I have a 24v HUM terminal and wanted to verify if this is the right place to hook the the humidistat?

Also, do I need to use the provided transformer or is that only if I connect power to the 120v side (say to run the humidifier when the fan is on outside of the heat).

Thanks,

Ryan

 

Hi Ryan

I am looking at the service manual for your furnace, and I am seeing the HUM is 120 volt same as the EAC. Unless your board does say it's 24 volts?

Yes you are going to need the transformer. (for both HUM and EAC)

 

Jay, thanks so much for the response. I did the dumb thing and "assumed" it was 24v based on the print on the board which says HUM 24 VAC. This is right next to a row of terminals labeled R, C, W, Y, G. Is this the same diagram that you are looking at (the row of RCWYG on one side of the HUM terminal and a jumper switch of sorts labeled 'Heat Off-Delay' on the other side)?

Thanks again,

Ryan

 

Ryan.

I am pulling up a file from 2001. Your's may be newer?

I am looking at PDF page 28 (paper page 26), Does this match your diagram on the blower door?

 

I took a picture of the diagram on the inside of the furnace door to save time. Does this help?



Thanks again for your help

Ryan

 

Thanks Ryan,

Looks like you have two spots... One you're talking about is 24 volts, and looks like one on the right is 120v.

If you wire it to 24 volts, then you won't need the transformer, and will have power on it when heat is called for. That's would be the best setup. I did try to run ours on with the fan only, nothing was really gained than more wasted water.

 

Great thanks, So one wire goes from the 24 volt terminal to the humidistat then from the other side of the humidistat to the humidifier, then from the humidifier to ?? This is the only part I am not certain of.

Thanks so much for your help.

Ryan

 

Other wire from humidifier's valve to C (same row of t-stat wires hook up to)

 

I was looking into buying the HE260A and install instructions are not too clear to me until I found this thread. But what is C? My furnace and t-stat doesn't use/have C.

thanks,
Ben

 

Ben,

C is "Common". Your furnace should have this, unless you have a Trane/American Standard, they use B as common. Others may say "24 volt Com" on the board.

What is the make/model of your furnace?

 

Jay,

I took a look and found a groundline. It's where the white and green wire for the 120V hook up. I've just finish installing the system and everything seems to work fine. It is wasting more water than I thought but it's worth it.

thanks for the help!
Ben

 

Ben,

Glad to hear you got it running. Once it get caught up, it's not too bad. I don't really notice it much on my water bill with this type, but yeah, I agree... It's a lot of water.

I want to wish you and your family a Merry Christmas!