confusing wires

Reply

  #1  
Old 08-15-10, 01:16 PM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
confusing wires

Help would be appreciated.

I have the following already in place:

Green (G) wire connected to G

Red (R/RC) wire connected to RC jumpered to RH

Orange and Yellow (Y) wire both connected to Y

White (W) wire connected to W

Blue wire not connected to anything

The thermostat I want to install (Honeywell) has the following connections:

E AUX Y G O L R B C

No instructions are available and I don't want to mess up the system. Any help with which wires from the old thermostat go where on the new one would be greatly appreciated.

Thank you
 
  #2  
Old 08-15-10, 07:27 PM
Jay11J's Avatar
Member
Join Date: Sep 2001
Location: Rochester, Minnesota
Posts: 18,427
Received 0 Votes on 0 Posts
Going to need more info on your system.. I take it you have a heat pump?

Make and model # on both inside and outside unit, and t-stat model #.
 
  #3  
Old 08-16-10, 08:27 AM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
equipment

Heat pump:

(outside) Carrier Model #25HBA348A320

(inside) Carrier Model # FX4CNF048

Thermostat:

Honeywell Pro 4000 Model #TH4210D1005

I'm pretty sure I've got everything figured out except where the WHITE wire connects and the BLUE wire connects.
 

Last edited by tomvon; 08-16-10 at 10:27 AM.
  #4  
Old 08-16-10, 09:10 AM
Jay11J's Avatar
Member
Join Date: Sep 2001
Location: Rochester, Minnesota
Posts: 18,427
Received 0 Votes on 0 Posts
White (W) wire connected to W
Blue wire not connected to anything

Old------New
G---------G
R/Rc------R
Orange---O
Yellow----Y
W--------??? (You haven't said what the indoor model# is? Is it gas or electric?)

Once we get the info you got on the indoor unit, then I'll go over the set up menu. Also, do you have extra wires in the wall?


Install Manual


Owner's Manual
 
  #5  
Old 08-16-10, 11:05 AM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
Heat pump:

(outside) Carrier Model #25HBA348A320

(inside) Carrier Model # FX4CNF048

electric

no extra wires. everything listed. it's odd that there isn't a terminal listed W like on most other thermostats. i'm thinking WHITE wire to AUX (which would require the jumper from E to AUX) and BLUE wire to B terminal (but BLUE wire is likely the change over relay to heat relay. So maybe BLUE wire to ???)
 

Last edited by tomvon; 08-16-10 at 11:34 AM.
  #6  
Old 08-16-10, 01:59 PM
Jay11J's Avatar
Member
Join Date: Sep 2001
Location: Rochester, Minnesota
Posts: 18,427
Received 0 Votes on 0 Posts
Originally Posted by tomvon View Post
it's odd that there isn't a terminal listed W like on most other thermostats.
This is a heat pump t-stat, so that's why there's no W.

Since you have an unused wire blue wire, we can do a couple of things.

- "Stage" the heat. You'll need to do some changing at the air handler.
- use it as a common wire, then you won't need to use battery as much on the t-stat.. Will need to hook this up at the air handler.


Old------New
G---------G
R/Rc------R
Orange---O
Yellow----Y
W--------Aux------W1 at air handler.
Blue------E--------W2 & W3 at air handler.

Or

W-------Aux/E
Blue-----C---------C at the air handler.


Stat set up.

Switch on back to Heat Pump.

Sat set up menu.

1-1
6-3
8-3
9-2
13-1
15-5


Are you planning on using the set back on this system?
 
  #7  
Old 08-16-10, 02:18 PM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
I'll head out and start hooking it up as you wrote it.

W to AUX/E with a jumper
B to C and B to C at the Air Handler

Not sure what set back is honestly.
 
  #8  
Old 08-16-10, 02:33 PM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
looks like who ever connected it originally spliced the blue with BROWN wires out at the air handler. does that matter? can it stay that way?
 
  #9  
Old 08-16-10, 02:36 PM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
if that's the case would it be BLUE wire to E?
 
  #10  
Old 08-16-10, 02:42 PM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
BROWN wires go to the two C terminals on the Air Handler
 
  #11  
Old 08-16-10, 02:48 PM
T
Member
Thread Starter
Join Date: Aug 2010
Location: United States
Posts: 8
Received 0 Votes on 0 Posts
okay, since BLUE goes to BROWN at the handler and BROWN is connected to the two C terminals, the air handler is good to go. Just have to connect BLUE to C terminal at Thermostat.

WHITE to AUX/E

Thanks for your help Jay. Never done this before and I learned a lot.
 
  #12  
Old 08-16-10, 03:42 PM
Jay11J's Avatar
Member
Join Date: Sep 2001
Location: Rochester, Minnesota
Posts: 18,427
Received 0 Votes on 0 Posts
Then you are good to go.

have a great week!
 
 

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