Common Wire "C" wire connection

Reply

  #1  
Old 11-21-13, 05:52 PM
B
Member
Thread Starter
Join Date: Nov 2013
Posts: 4
Received 0 Votes on 0 Posts
Common Wire "C" wire connection

I am replacing my honeywell rth6300b thermostat with a Honeywell RTH6580WF, and need to connect a common wire, as my existing wiring only includes R, Y, W, and G wires. I do have 2 spare wires, but am not certain where to connect them at the air handler, and would appreciate some guidance...

My unit does not have terminals I could connect to, but there are 3 wires leaving the air handler labelled as R, G, and C (on the wires and the wiring diagram), I'm just not sure if I'm supposed to splice right into the C wire...

Also, what type of consequences would I face if this were hooked up incorrectly? Would I be looking at a blown fuse, or could I end up having to replace something more substantial? I am aware of the physical dangers and am not touching anything without the circuit breaker turned off...

I have attached some pictures below...

Where the wires come in from the left of the picture is what is coming out of the air handler - Brown wire is "C", the Red is "R", and the Green is "G"

Thanks!
 
Attached Images   
Sponsored Links
  #2  
Old 11-21-13, 05:56 PM
B
Member
Thread Starter
Join Date: Nov 2013
Posts: 4
Received 0 Votes on 0 Posts
Here is a picture of the wiring diagram as well as the wiring inside the panel (where the wires are coming from)... also, the wire that is already connected to the "C" wire is going to some other part of the system, not to the thermostat.

Thanks!
 
Attached Images   
  #3  
Old 11-21-13, 06:06 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 59,842
Received 1,202 Votes on 1,112 Posts
Welcome to the forums.

The brown wire is the C connection and you can connect to it anywhere for your thermostat. If there is a screw terminal there will be a C wire to the A/C compressor..... you can connect there for two wires under that screw terminal.


Name:  ccc.jpg
Views: 1513
Size:  15.7 KB
 
  #4  
Old 11-21-13, 06:09 PM
canuk's Avatar
Member
Join Date: Sep 2013
Posts: 293
Received 0 Votes on 0 Posts
Thanks for the pictures they do help.

From the looks of things you would connect to the *C* brown wire.

I'm guessing there is also a brown wire available , that's not being used, at the thermostat , use that . If not a brown any unused wire will do just fine.

Looks as though you can simply make the connection at the orange wire nut -- which is handy.
 
  #5  
Old 11-21-13, 06:11 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,425
Received 17 Votes on 14 Posts
I'd connect the stat C to the brown air handler wire.
It should work without issue.
You do not have a low voltage fuse protecting the transformer.
Adding a fuse holder to the R circuit and putting a 5 amp fuse in it would protect your transformer should the wiring to your outdoor unit ever get damaged.

 
  #6  
Old 11-21-13, 08:20 PM
B
Member
Thread Starter
Join Date: Nov 2013
Posts: 4
Received 0 Votes on 0 Posts
Wow thanks for the quick responses, and thank you Houston for the fuse suggestion! I'll definitely pick one up to protect the transformer.


I'm going to hook up the thermostat now and I'll post back with my results.

Thanks!
 
  #7  
Old 11-21-13, 09:56 PM
B
Member
Thread Starter
Join Date: Nov 2013
Posts: 4
Received 0 Votes on 0 Posts
Got it all wired up and everything works! Thanks guys!!
 
  #8  
Old 11-21-13, 10:09 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 59,842
Received 1,202 Votes on 1,112 Posts
Well done....................
 
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: