Heat Pumps and Electric Heating - Wiring a Honeywell ProVision TH8321U1006, upgrade from Weathertron Tstat

Saw these links, but didn't answer my question unfortunately:
Help wiring Honeywell VisionPro TH8321U1006 [Archive] - DoItYourself.com Community Forums (http://forum.doityourself.com/archive/index.php/t-327050.html)
http://forum.doityourself.com/heat-pumps-electric-heating/327050-help-wiring-honeywell-visionpro-th8321u1006.html

I hope I didn't get in over my head. I'm normally pretty good fixing things around the house but I'm at a loss with this wiring and am hoping some experts here can save me :) I'm trying to a) confirm the details of my HVAC system and then using that knowledge to b) determine how to wire a new thermostat for that unit. Here's everything I know, thanks for the help!

Outdoor Unit:
- Built Sep 1999, Split Sys Heat Pump
- Outdoor Model / Serial Num: XE1000 TWR024C100A5 / P29IT3J4F?
- Indoor Model / Serial Num: TWG025A140B0 / P374NF91Y
- Indoor Heater Model: BAYHTR1410

What I don't know, which impacts the wiring:
1) I think it's dual stage, but cannot confirm?
2) I think its a single compressor (not two) but again am not sure?
3) Unsure if it is a 2H/1C (w/Auxillary Heat), 2H/2C (w/o aux heat), 3H/2C (w/ aux heat). NOTE: The existing Weathertron thermostat has a light for Aux Heat and another light for Emergency Heat if that helps.

Existing Thermostat Details:
- Weathertron
- Wiring NOTE: From what I've read, I think the original installer didn't have enough wire and reused colors / wires. To explain there is a single strand of 5 wires coming out of the wall (white / red / yellow / green / blue), and then 3 more separate (*blue* / *white* / *green*) which I've indicated with an asterisk to show the difference below. Also note that this second green wire was not wired to any terminal.

(Terminal = Wire color)
X2 = *Blue* wire
B = *White* wire
W = White wire
R = Red wire
Y = Yellow wire
G = Green wire
O = Blue wire
T = <no wire>
U = <no wire>
F = <no wire>


New Thermostat: Honeywell VisionPro TH8321U1006

3 possible terminal configs depending on HVAC system per questions above:

1) 2H/1C (w/ aux heat)
L = Equipment monitor
E = Emergency heat relay
Aux = Aux heat relay
Rc = Power
R = (R + Rc joined by jumper)
O/B = Changeover valve
Y = Compressor relay
G = Fan relay
C = 24VAC common
S1 = Optional outdoor / remote sensor
S2 = Optional outdoor / remote sensor

2) 2H/2C (w/o aux heat)
Y2 = Compressor 2 relay
Rc = Power
R = (R + Rc joined by jumper)
O/B = Changeover valve
Y = Compressor 1 relay
G = Fan relay
C = 24VAC common
S1 = Optional outdoor / remote sensor
S2 = Optional outdoor / remote sensor

3) 3H/2C (w/ aux heat)
Y2 = Compressor 2 relay
L = Equipment monitor
E = Emergency heat relay
Aux = Aux heat relay
Rc = Power
R = (R + Rc joined by jumper)
O/B = Changeover valve
Y = Compressor 1 relay
G = Fan relay
C = 24VAC common
S1 = Optional outdoor / remote sensor
S2 = Optional outdoor / remote sensor

Thanks for the help!

Option 1.

E = *Blue
Aux = White
Rc & R = Red (use supplied jumper)
O/B = Blue
Y = yellow
G = green
C = *White

Set option 170 to 7
option 190 = 0

http://i151.photobucket.com/albums/s160/Houston204/VisionPro3Heat2Cool.jpg

http://i151.photobucket.com/albums/s160/Houston204/Baystat.jpg

Option 1.

E = *Blue
Aux = White
....

Thanks for the quick reply! I'll give this a try tomorrow once I get the deck refinish tied up. The wiring diagrams for both Tstats is extremely helpful, thanks for posting.

While I try this, could you explain some of your post so I can better understand for the future?
- When you say option 1, I assume you mean I have a 2H/1C (w/ aux heat correct)? But I thought I also had emergency heat in addition to Aux Heat and Norm Heat?
- Is the system single or multi-stage?
- Single or dual compressor?

Honeywell describes your setup as a 2H/1C. A 2 speed heatpump with Aux heat is what they describe as 3H/2C operation.

You have a multistage system since you are using auxillary heat for stage 2 heat, and Y (compressor) energized without O (reversing valve) is first stage heat.

The use of a Y2 terminal on your old stat would have indicated a 2 speed or dual compressor (Trane has both).
You have 1 stage cooling.


Remember to remove power to your indoor unit first.

Honeywell describes your setup as a 2H/1C. A 2 speed ...

Perfect! I copied that down for the future and wired up the TStat as you recommended. Initial testing and operation looks good, I'll keep an eye on it but right now it seems good to go.

Can't say thanks enough, your time is appreciated.

I had posted this on another forum as well and there was a recent response that seconded your recommendation with one deviation. They indicated to "jumper the e/aux to the w terminal on the stat" - any idea why they would recommend that?

If not, no issues, appears to be operating without that jumper. Again, thanks for your help.

The manual states to install a jumper between Aux and E if there is no emergency heat relay.

This jumper is not necessary in your application since you have a separate wire at each terminal. (Although it is possible that *blue and white are already jumpered at your air handler)