In alt.home.repair on Sat, 02 Aug 2003 15:12:42 -0400 meirman
posted:


But, Peter, if you run a the switch part of a relay in simple shunt
with the ON position of the Fan switch, the power will go (logically
only since it is AC current) in the opposite direction, compared to
the last sentence of the previous paragraph**. That is, when the relay
you add sends 24 volts to the Green wire, that 24 volts would be
present at the AUTO lead of the Fan switch. We know the Fan switch is

I guess these lines are a little backwards, relative to the Fan
switch. ....the 24 volts from the Green wire would be present at the
Common terminal of the Fan switch.

in the AUTO position, because if it were in the ON position, it would
be ON all the time anyhow and Peter would be asking how to turn it
off, not how to turn it on. When the 24 volts reaches the Fan switch
Auto position, it then goes through the switch to the common terminal
of the Fan switch. And then via the internal connection in the

It reaches the Common terminal and then goes through the switch to the
AUTO terminal, and from the AUTO terminal to the Yellow screw/wire.

thermostat, to the Yellow screw/wire, where it goes to the furnace and
activates the cooling relay and cooling function of the AC.


Meirman

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