Possibly a neutral for some function of the thermostat? In any event, figure
out which two wires complete the circuit to the heaters and use them on the
new thermostat


wrote in message
oups.com...
I have line volt thermostats for each of the baseboard heaters in my
condo. The thermostats are old analog and ugly. I want to replace
them with electronic thermostats. I pulled one of the old thermostats
off the wall to check the wiring. A single pole should have 2 wires,
while a double pole has four. My thermostats have 3 wires plus a
ground. One red, one black and one white. On the electrical panel,
there are 2 breakers for the heat, so I'm assuming it's 240 volts to
the heaters. I've looked for hours on the web, and I can't find an
example wiring diagram that matches what I have. Any ideas or
suggestions? The mini wiring diagram on the old thermostat shows it to
be a single pole with one wire to line and one to load. No mention of
the third wire at all, making it rather useless.

Thanks in advance!