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[bearfeet]

maybe I missed something.  can someone   please    show a thermostat  wiring/color diagram of a  o.w.b  to a gas furnace with  a/c.??

do you need a zone valve & a bypass right before the heat exchanger to keep the water from circulating thru the coil or does the thermostat bring the pump on & off.. ?/

thanks

[RSI]

Most people have the water circulating through the heat exchanger 24/7 and just turn the fan on and off with the thermostat.
The fan connection is usually the green wire and is the G connection. The W wire is the heat connection. To run the fan for the OWB, you just connect the G wire to the W on the thermostat you are using for the OWB. If you are using two thermostats the RH needs to be connected to both and the C should be if it is on the original. Just using jumper wire between the two thermostats works fine. The G (from furnace side) should be not be connected to both thermostats, only the one for the OWB.

[bearfeet]

can you please post a wiring diagram & show the connections.

thanks....