(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 2 of 2

Thread: wiring furnace transformer Q.

  1. #1
    DIY Junior Member thebunrman's Avatar
    Join Date
    Oct 2012
    New York

    Default wiring furnace transformer Q.

    Hi all, I am trying to install a new transformer on my furnace and well the new transformer does not have the labels my old one did, COM , COM , 120v, 24v. Here is a picture of the transformer it only shows LOAD, LINE but doesn't specify which lead is exactly what.

    Also I have attached a second picture of my old transformer.

    Thanks for any help.

    Last edited by thebunrman; 10-26-2012 at 12:39 PM.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Line is the 120vac, load is the 24vac. It often doesn't matter which lead goes where as long as you match the leads to the line (120vac) to the line and the load to the load.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

Similar Threads

  1. Transformer
    By g4s in forum HVAC Heating & Cooling
    Replies: 3
    Last Post: 05-12-2010, 07:20 PM
  2. Wiring new thermostat to the furnace
    By keano016 in forum Boiler Forum
    Replies: 12
    Last Post: 11-16-2009, 06:34 PM
  3. 24vac transformer wiring
    By Master Brian in forum HVAC Heating & Cooling
    Replies: 4
    Last Post: 04-29-2009, 08:44 AM
  4. Pole transformer exploded - danger from burning transformer oil w/ pcbs?
    By Probedude in forum Electrical Forum discussion & Blog
    Replies: 22
    Last Post: 01-05-2009, 10:59 AM
  5. 120V to 12V AC Transformer Wiring Question
    By Doug Parsons in forum Electrical Forum discussion & Blog
    Replies: 3
    Last Post: 10-30-2008, 05:49 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts