Backwards. The heating system doesn't provide a common.

--
Christopher A. Young
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..


"Sam Takoy" wrote in message
...

**My mistake, you do have to power the unit from the
cooling system. C and
R, with jumper to RC, powers the unit and the cooling.
Remove the jumper
from RH. connect the Y and G from your cooling system as
well. Then the 2
wires from the heating system just go to RH and W o/b, and
it doesn't matter
what order these two go in

Thank you for all the responses.

May I confirm that I understand something correctly? The
reason why I
CAN'T power the unit via the heating system is because it
doesn't
provide a hot. The two present conductors are responsible
for the relay
only.

Thanks