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tayl428 10-09-2010 04:20 PM

Yet another Honeywell RTH8500 thermostat install
Replacing thermostat:
old tstat: BDP (Carrier / Bryant) P271-3457
new tstat: Honeywell RTH8500
heat pump

old wiring and old tstat terminals:

black - C
green - G
yellow - Y
red - R
brown - E
blue - W2
no wire - F
orange - O
white - W1

My planned wiring to new tstat:
black - C
green - G
yellow - Y
red - R (jumpered to Rc)
brown - E
orange - O/B
blue - ???
white - ???

On the new tstat, I have these terminals available in heat pump op:
Rc, R, O/B, Y, G, C, Y2, L, E, Aux, S1, S2.

Any guesses for the blue and white wires?


beenthere 10-09-2010 05:39 PM

Both to aux.

tayl428 10-09-2010 09:08 PM

That's what I was thinking. Tried it, everything seems ok for now for A/C. Going to have to wait for heat, it's still warm in FL.

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