Heating, Air Conditioning, Fridge, HVAC/HVAC transition from honewyell to Nest thermostat
My HVAC system has 3 zones. Two for heat and cool using Honeywell T87F thermostats. One with heat only (simple single red wire to Rh and White to W. no question here). The heat/AC is a Bryant unit, with a "Ultra-Zone" Zone Conrol Pannel on the side.
The trouble I'm having is how to connect the Nest Gen2 thermostat to the primary zone (the one that has controls for heat/off/AC and fan auto/on). The wiring to the primary zone has 6 wires (R,W,Y,G, Orange, Blue). But the Nest has a combined OB connector vs. separate connection points. So I'm not sure what to do.
The second Honeywell T87F has only 3 wires (R,W,Y). I'm only trying to connect one Nest, and that's to the primary with the 6 wires.
Here's more on the "Ultra-Zone" Zone Conrol Pannel:
Physically located top to bottom on right side:
"zone 2 T'Stat"
W, Y, R
"Zone 1 T'Stat"
W, Y, then on second zone 1 connector
R, Orange, Blue, G (spelling out the O for Orange and B for Blue (not black, not black/blue combo) since these two wires are the trouble
then on "additional zone panel"
white wire in to O, and then R, G
another red wire into "+"
another white wire in to "-"
on left side on the Ultra-Zone panel top to bottom
zone 2 motor
R, W, Y
zone 1 motor
R, W, Y
So to summarize, I'm looking for what to do with the Orange and Blue wires on the Nest.
One additional point, which I'm adding and not sure if it applies: I don't think I have a heat pump, and on another Q &A thread someone said that if you don't have a heat pump you don't need to use the O and B wires in your thermostat. After looking at the zone control panel that had the O and B wires plugged in to the panel on the right side, however, I'm not so sure I can just leave them off the Nest installation.
Crossing my fingers!
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