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Posted by RBM on November 18, 2006, 10:47 pm
Interesting concept, but a moot point, if he's replacing it
>
>> 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.
>
> This is a complete WAG but ....
>
> Your thermostat may have some kind of "heat antitipater" circuit built in.
>
> The white wire may provide the return path to power going to an internal
> heater. If so, the thermostat should have a definite voltage rating
> (120
> or 240) since the resistor would get 4 times the power at the higher
> voltage.
>
> The easy way to check this is to label the wires, remove the thermostat
> and
> do some checking with a VOM. If my WAG is correct then at a very high
> setting the Red and Black should be connected (zero ohms) and the white
> wire
> would have something on the order of 40 k ohms to either red or black. At
> a
> very low setting the red & black will be disconnected from each other but
> there will will be the 40k reading between white and ONE of the two
> colored
> wires. The colored wire that's always connected to the resistor is the
> LOAD side.
>>
>
>
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