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Electric Baseboard thermostat wiring

I am replacing the thermostat for my 2 electric baseboard heaters and the replacement unit I bought has 4 wires, red, white, green and black while the old uint had just red and black.

There are 3 white wires, 3 black wires and bare solid copper. I know the green wire connects to bare copper, but I am confused on how to connect the others.

How should I connect the wires?

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Re: Electric Baseboard thermostat wiring

What is the make of the thermostat? are the heaters 240 volts?

Posted on Jan 27, 2008

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It sound alright but You should draw out a wiring diagram on paper first before you tackle the job that way you know you're doing it right.

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I hope you are using a Line Voltage Thermostat!! First, make sure that the power feeding the thermostat is coming from a two pole breaker of the correct amperage (20 amp). If you are using 12-2 wire with ground then please mark the white wire with black tape at each end to identify it as a HOT power source and not a Neutral wire (which is a grounded lead). Do the same for the 12-2 wires feeding the baseboard heater from the Line Voltage Thermostat. The wires from the thermostat (One Black & one White w/black tape) will be wired to each one of the two wires (one Black & one Red or two Black wires) at the baseboard heater. It doesn't matter which wire from the thermostat is wired to which wire at the heater, just as long as there is one wire to one and one wire to the other.(eg. Black from stat to Black at heater/White w/blk. tape from stat to Red at heater OR Black from stat to Black at heater/White w/blk. tape from stat to OTHER Black at heater). I have seen baseboard heaters with two black wires or one black and one red wire. Hope this helps, but if you are confused then please have an experienced tech. do it for you.

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I just had the same problem last night. Wire the two red wires from the thermostat to the power source from the service panel. The remaining two black wires from the thermostat connect to the heater.

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You need a meter, it will be hard without this! If you have 220v in the wall, then think of it like this; each wire is 120v. Test to each other, you get 220v. The thermostat is a double pole, you said. So think of it like this, its an adjustable temperature controlled switch that lets electricity through at the temp. you set it at. If you have 120v from one wire connected to one end of the element, and the other 120v connected to the other end of the element, then it will work. DO NOT CONNECT THE 120V TOGETHER. IT MUST GO THROUGH THE ELEMENT FIRST. The thermostat should be between the power from the wall and the element, to control the temperature.

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