[drandersoninc]

Saw this link, but didn't fully answer my issue unfortunately: https://www.askmehelpdesk.com/advice/t-323175.html

Wiring question for Honeywell ProVision TH8321U1006, upgrade from Weathertron Tstat

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 it's 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!