Original message
| WARDZY
 |  "Going to Programmable from Lennox"
, posted Thu 24 Jan 13:39:  
I have a Lennox thermostat and heat pump currently. We recently purchased the Honeywell RTH7500. We have A/C, heat, and emergency heat. I'm not sure about the wiring that is coming into the old thermostat, which I think is a multi-stage. I don't have the numbers off the stat because I am at work right now. Here's what I'm looking at; terminals on the left, wire color on right.
O - Orange
G - Green
Y1 - Yellow
R - Red
L - Brown
T - Blue (I understand that I do not need this wire with the new programmable thermostat)
C - Black
W1 - White & a lighter Reddish Pinkish than the Red on "R" (2 separate wires connected to this terminal. I this reddish one goes to the Emergency heat light on the thermostat.)
E - Nothing connected
There are diagrams all around, but here are the terminals on the new unit.
RC, R, O/B, Y, G, C, L, E, Aux
Any help would be appreciated! I'm a little stuck!
Thanks,
Wardzy
[this message was edited by WARDZY on Thu 24 Jan 14:31] |
| Replies:
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| Houston204
|  "Re(1):Going to Programmable from Lennox"
, posted Thu 24 Jan 21:22:
C = black
G = green
Y = yellow
O/B = orange
Rc & R = red
Aux & E = white (use jumper wire)
L = brown
Tape off blue
option 170 = 7
190 = 0
"Tip of the Day" Remember to remove power first.
[this message was edited by Houston204 on Thu 24 Jan 21:23] |
| | WARDZY
| "Re(2):Going to Programmable from Lennox" , posted Fri 25 Jan 07:22
Thanks! That's what I ended up doing basically. I thought that may be the setup and decided to go ahead and do it when I got home last night. I need to get some wire to jump "E" and "Aux" though. Seems to be working fine so far!
Hard to tell if this is going to save money over the long haul... it was 8 degrees here overnight, so the thing ran most of the night!
Thanks again for replying!
Wardzy
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