Humidifiers and Dehumidifiers - Humidifier connection on Variable Speed

This site is great and has a lot of information on the electrical connections for the humidifiers but I could not find what I am needing so if someone could please help it would be greatly appreciated.

I have an American Standard 4tee variable speed air handler and am connecting a Skuttle bypass humidifier. Per the wiring diagram on the unit, I connected to the R and BK terminals but got nothing.
trane.com/webcache/un/.../product/12-1171-02_08012001.pdf (see pg 14).

Researching this site, I found that this is not the HUM terminals. Can someone direct me to where to connect the humidifier.

It is my understanding that I do not need the transformer or A-50 relay if I am on the 24v side. Please confirm

Thanks, Scott

Welcome aboard.


The BK is used for humidistat on the cooling side, not heating.

On your air handler, you have two ways of doing it, and dpends on what you use the most, the heat pump side or the electric heat?

Also, are you planning on using hot water for the water feed for the humidifier?

I am in the Atlanta area, so we do not get that many cold days that require the electric back up heaters. We use a fireplace and it really dries out the air and hardwood floors. I am connected to the cold water side, but the hot water is right there and would be real easy to change over if it would help.

What is the full model # of your air handler? The link you pasted is not working (no a full address)

With heat pump system., the air flow temp is not really hot, so the hot water would be better for HP system.

Sorry about the link, did not realize it left out the center. Here it is corrected. Unit is 4TEE3F37

http://www.trane.com/webcache/un/split system air handlers (ssa)/product/12-1171-02_08012001.pdf

Ok, on your model there is no direct hook up. (Most heat hump system, humidifier is not needed, so that's why there is no hook up)


Only thing you can do is get power off of G , and common back onto C on the low voltage hook up.

Just have to turn off the humidifier in the cooling season.

What do you have for t-stat on this setup?

T-stat is Honeywell TH8320

Thanks a bunch!! - just to summarize:

1) connect one wire to "G" terminal
2) connect other to "rd" wire which is on the 24V side of Com

Does it matter what side of the fuse?

That's a good t-stat, but I'd suggest the Honeywell IAQ t-stat, then you can wire the humidifer right to that control, and then it will only run the humidifier as needed.

G-------humidistat-------Water valve------------C

Fuse?

Jay - thanks for the help. I got it figured out. I looked on T-stat for the C and G wires. C = B on my unit and G=G

The fuse comment was based on following the wiring diagram off of the line voltage into the transformer. The line voltage common enters the transformer and on the 24V side is a red wire that is fused.

I like the IAQ, but as my unit is only a year old, I will just run the humidistat and Tstat. I pre-ran the wire during construction so no big headache. Thanks again for the help!!

Glad to help out.

WOuld you like me to go over the installer settings on your t-stat to make sure all is good?

The one settings I suggest is the heating cycle per hour (CPH). I suggest them all to be set to 3.

What is your opinion on the "Circ" vs "auto" fan setting. I cannot say that I have noticed a big difference in overall temp of the house - or power bill. But I probably have not given the Circulate much of a chance.

I looked at the CPH in the past and believe that it is set at 3 (will look again).

I run my fan "ON" all the time in the when the windows are closed. Only time I put it in AUTO is when the A/C is on.

Circ I've may of used it a few times in the summer time when the A/C hasn't run much, help move some air in the home, but not alot where humidity will be back into the home from the A-Coil.