Question about Honeywell Programmable Thermostat Heater

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Wiring a programmable thermostat for baseboard heater

I am changing the thermostat with a programmable one and the problem is there is 2 heaters and one thermostat.
There is a set of red, black, and ground wire coming from the 2 heaters and there is the power wire that also has red,black and a ground.

I am just wonder how to wiring the new programmable thermosat that only has 2 black wires

in total there is 3 red wires , 3 black wires and 3 ground wires .

What do I do ???

Any help would be great

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  • Don Berry May 11, 2010

    You may have already figured this one out by now. If you still need help let me know if this is a 24v thermostat controlling 2 gas fired furnaces or if it is another arrangement.

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The red and black is power and neutral. Green is just for the ground and that should tie into the ground wire for breaker or power wire .
The 2 black wire from thermostat should tie into the two red and black wire from your heater.
Just imagine you are wiring 1 heater to thermostat and just add the the next heater the same way

Posted on May 19, 2017

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Posted on Jan 02, 2017

hotuna
  • 288 Answers

SOURCE: Electric baseboard heater

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.

Posted on Jan 09, 2008

  • 1 Answer

SOURCE: marley md26 line voltage thermostat

The Black Wires from the md26 are your load(the heater) and the red lines are your line(power). The lines are also paired up on the thermostat with a red and black on the left and are red and black on the right. In the actual heater connect the black to the black wire and the white to the white and connect the grounds. In the thermostat connect the black from the heater to left side black( remember there are pairs left(black, red) right (black, red) and the white to the right side black connect the black from your power to the left side red and the white from your power to the right side red. Should be ready to go.

Posted on Nov 19, 2008

  • 1 Answer

SOURCE: rewire an old 2 wire thermostat to a honeywell 5-1-1 programmable

I connected the blue wire to the R and the white wire to the W on the old thermostat and shoved the new Honeywell 5-1-1 Day programmable thermostat up the first guys *** that i ran into at Canadian Tire

Thanks for your help

Posted on Dec 29, 2008

  • 15 Answers

SOURCE: Replace three wire thermostat with four wire thermostat

From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.

Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.

Posted on Jan 26, 2009

  • 10 Answers

SOURCE: Farenheat baseboard heater F2544

You should have a licensed electrician connect this for you.

You did not specify the voltage. Baseboard heat comes in different voltages. If you connect a 240v unit to 110v it will work but only put out half of it's heat.

If you connect a 110v unit to 240v you will start an instant fire.

There should not be a thermostat on the unit and another on the wall. You can buy units for each application. You are probably looking at the thermistor which is a safety device which opens the circuit when there is too much heat. It must remain wired in series with the heat coil.

Also note that it is a violation of the National Electric code to install electric baseboard heat underneath an existing outlet. It is also common sense to not install it under drapes or near anything else combustible.

Posted on Feb 09, 2009

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