DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > HVAC > Humidifier wiring

Help Support House Repair Talk by donating using the link above.
Thread Tools Search this Thread
Old 11-07-2012, 09:23 PM  
Join Date: Jan 2010
Location: , Western Hemisphere, N of the equator
Posts: 2,471
Liked 176 Times on 162 Posts
Likes Given: 108


A typical HVAC transformer supplies 40 VA, 1.7A at 24V, so your relay coil should probably pull a max current of 0.2A or so in order that it doesn't significantly load down the existing transformer.

When I added an Aprilaire 760 to my '82 furnace I was surprised to find that the humidifier solenoid valve was working on 17 vac, down from the nominal 24 vac. I would have said that the humidifier's transformer was being overloaded but the thing has worked now for years.

When you get your system working, make voltage and current measurements so you have troubleshooting data for when you'll need it.

Last edited by Wuzzat?; 11-07-2012 at 09:36 PM.
Wuzzat? is offline  
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
wiring a HE225 humidifier to electric furnance winchellb HVAC 1 12-11-2011 02:46 PM
De-Humidifier Problem BRIANL00 General Appliance Discussion 0 08-10-2011 07:10 AM
Aprilia humidifier brasilmom HVAC 3 02-14-2011 08:30 PM
Humidifier wiring sgw1064 Electrical and Wiring 9 10-28-2010 05:36 AM
Whole house humidifier brasilmom HVAC 13 12-10-2009 08:19 AM

Newest Threads