Register                
Results 1 to 2 of 2

Thread: Trane XL824 E wire

  1. #1
    Junior Member

    User Info Menu

    Trane XL824 E wire

    I'm getting ready to replace an old Honeywell with an XL824 on my heat pump system.

    Everything makes sense except there is an E wire on the existing thermostat.
    Where does that go on the new one ? Thanks.


    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Old.jpg 
Views:	65 
Size:	69.6 KB 
ID:	1405   Click image for larger version. 

Name:	824.JPG 
Views:	61 
Size:	30.2 KB 
ID:	1406  

  2. #2
    Administrator

    User Info Menu

    The E and the Aux most likely do the the same thing on your HVAC system. Typically the Aux (back up heat or electric heat) is enabled when the heat pump can not keep up. The E is enable when you manually command the thermostat to not use the heat pump and use back up or electric heat. On some older indoor units there are separate heating elements for Aux and emergency heat.

Posting Permissions

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