O/B wire to O or B slot

[smokey0810]

Moving from our eco bee thermostat to a Honeywell. Ecobee had orange wire running to a slot labeled O/B and the wire is orange. New Honeywell has both O and B slot. Which do I plug the orange wire into?

 

[PoorUB]

Depends on the equipment.
You could hook it to either, run the equipment and if it is doing the opposite, heating instead of cooling, and vice-versa, move it to the other terminal. You won't hurt anything.

 

[bb29510]

orange is the heat pump reverseing valve and its poistive (hot) in the cooling mode, so there be no voltage in heat mode

 

[PoorUB]

orange is the heat pump reverseing valve and its poistive (hot) in the cooling mode, so there be no voltage in heat mode

Depends on the brand of equipment, some energize the reversing valve in heat, some in cooling.