Trane packaged unit WiFi thermostat wiring help

Reply

  #1  
Old 07-06-20, 08:53 AM
C
Member
Thread Starter
Join Date: Jul 2020
Posts: 2
Received 0 Votes on 0 Posts
Trane packaged unit WiFi thermostat wiring help

I have a Trane gas heat/ electric cooling packaged unit (4YYC4048A1090A) but am confused by the thermostat wiring. I'm trying to upgrade to a WiFi thermostat that needs a C wire which I currently don't have for my "dumb" thermostat.

Looking at the HVAC end, it seems like I have a Y, W, G, R, B wires coming out of the brown wiring (pic 1) sheath that runs out of the HVAC unit. The blue appears to be spliced for the 24v common wiring. However, the wire colors at the thermostat in my house are completely different colors, with no B wire running from the wall. Is there something simple I am missing to make sense of this?

Thanks for any help




 
Sponsored Links
  #2  
Old 07-06-20, 11:23 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 57,650
Received 906 Votes on 846 Posts
Welcome to the forums.

At your thermostat I see four t'stat wires white, red, green, yellow.
That brown and dark green do not end up at the rooftop unit.

The wires at the thermostat don't match the wires at the rooftop unit. There is a splice somewhere in between as the cables are two different types.

Heavy wire ...........T'Stat wire
White -----------------> white -------------> W
Green ----------------> green ------------> G
Yellow ----------------> yellow ------------> Y
Red -------------------> red ----------------> R
Blue ------------------> blue ---------------> C
 
  #3  
Old 07-06-20, 01:39 PM
C
Member
Thread Starter
Join Date: Jul 2020
Posts: 2
Received 0 Votes on 0 Posts
Thanks. Guess I'll go digging around in the attic tonight.
 
Reply
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: