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Williams wall non-elec gas heater. Black copper wire tagged thermostat?

I've replaced a Williams wall gas heater non-electric. The thermostat is connected right and mounted on the wall. But, there's a thick black copper wire on the side of the furnace tagged thermostat. I don't know what to do with it? Where do you connect this wire? When it touches the top screw of the three screws running vertically(where the other wires are connected). The burner lights up and stays on, even if you play with the wall thermostat. Touching the other two screws doesn't do anything. Now, the manual talks about connecting it to the venting wires? Extra wires coming from the top or maybe somewhere else in the wall? I've left it connected to the first screw, ran the heater. But, it never turns off? Any suggestions? Thanks

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  • Anonymous Nov 22, 2008

    not sure where the wires (2) go on the bottom of williams gas heater. Have simple mercury thermostat. Thanks

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First make sure this is a heater set up for a remote mounted thermostat. If so, the gas valve has 3 screws labeled TH (thermostat) and TP (thermopile) that's the flame sensor with 2 wires coming off it, I don't know where the goofy name comes from. there will be one screw that has both, usually the top one. Wire accordingly. The new valves have a solenoid on the bottom. this connects to the high temp. sensor up top. It has 2 wires on it, one connects to the thermostat wire, the other goes to the screw with TH and TP. Or you can skip it and connect the wire from the back of the valve to the Th and TP screw. Make sure the thermostat wires aren't pinched somewhere, thus eliminating the thermostats control.

Posted on Mar 02, 2008

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Has the control knob been turned from the PILOT position to the ON position?
If that has been done, check the wiring from the thermostat to the Gas Control Valve in the heater. Make sure the wires are connected in both places (T-Stat & Control Valve). If all of that appears to be correct, there's a good chance that the Thermopile (I think Williams calls it a Pilot Generator) has failed. This part generates millivolts of electricity to open and close the gas valve when the Thermostat calls for heat. But, don't confuse the Thermopile with the Thermocouple. Your unit has both. And since the pilot is burning, that tells me it's not a problem with the Thermocouple.

Anyway, the only way to test the thermopile is with a millivolt multimeter. You will have to consult your Owners Manual for the proper millivolt output for your heater.

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1 Answer

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themobilian_1545.jpg
Your thermocouple may be shot.
Have ya try to replace that one?
A simple thermostat now let me show ya a video of a man that has replaced his thermostat. Even though that gas valve is a bit different the thermocouple does the same function and that is hold down the safety magnet. Now watch:



Replace that thermocouple on your heater.

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Hi,
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they are sold by lentgh so you need to measure the old one when you go to buy a replacement...

heatman101

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I've replaced a Williams wall gas heater non-electric. The thermostat is connected right and mounted on the wall. But, there's a thick black copper wire on the side of the furnace tagged thermostat. I don't know what to do with it? Where do you connect this wire? When it touches the top screw of the three screws running vertically(where the other wires are connected). The burner lights up and stays on, even if you play with the wall thermostat. Touching the other two screws doesn't do anything. Now, the manual talks about connecting it to the venting wires? Extra wires coming from the top or maybe somewhere else in the wall? I've left it connected to the first screw, ran the heater. But, it never turns off? Any suggestions? Thanks

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