In alt.home.repair on Thu, 31 Jul 2003 21:28:28 -0400 Peter
posted:

On Thu, 31 Jul 2003 23:56:24 GMT, "David Martel"
wrote:

Peter,

I think he answered the question.
C Black/Blue - Common of 24 VAC transformer
G Green - Fan relay


Dave M.

I have yellow, green, white, red, blue wires. The blue wire is not
connected to anything. There is no black wire. That leaves yellow,
green, white, red.

Someone pointed out that standard colors are only used most of the
time. Do you have a thermostat connected now? And it works
correctly?

A voltohmmeter?. Turn off the furnace, then you can write down which
wire is connected to which screw on the thermostat, then disconnect
the wires. With the ohmmeter, you can find which pair of screws (and
which pair of corresponding wires) has zero, or near zero, resistance
between them when you have the fan switch on ON and infinite
resistance between them when you have the fan switch on OFF. On the
thermostat.

Since one is probably green, that will likely speed things up a lot.

Connect the switch in parallel to the thermostat switch, (You might
want to turn on the power and test it, then turn off the power again)
and reconnect the thermostat.

It's wonderful and very useful to ask for help, but no one else is at
your home, no one knows if for some strange reason yours wasn't wired
like others. Even human organs aren't always where they are usually
are.

You can also get in the habit of measuring for suitable voltages
before measureing resistance, and before connecting something new.

One side of the fan relay is the green wire. The other side is ???
(yellow, white or red).

Peter


Meirman

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