Electric baseboard wiring question

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  #1  
Old 10-10-05, 02:54 PM
phoenix316
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Electric baseboard wiring question

Here's the deal. Need to install baseboard heaters. Have the wiring diagram which i drew up and attached below in the link. Was wondering if it was good to have each heater controlled independantly by each elec. thermo. with what i drew. I know i messed up somewhere but not sure how to crrect it. I was also thinking about having 1 thermo control the 2 of them but was looking for the was to connect that up. If someone could take a look and tell me if i am going to burn me house down please feel free to offer your expertise. And if you know how to hookem up so that i can control both off of 1 thermo with less wire running through the walls that would be great also.

Thanks in advance

Diagram 1
 
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  #2  
Old 10-10-05, 03:03 PM
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Straight 240 volt devices need to have both wires switched. In your situation, the easiest way to wire this is to run the 12-2 from the panel to the thermostat, and connect to the input of the thermostat. The output of the thermostat is then run to the first heater with another piece of 12-2. Then you run to the second heater with a third piece of 12-2.

Instead you can run from the thermostat to both heaters, but this i harder for some people to understand and harder to wire because you have three more wires in the box.

In your diagram you won't be switching anything and the heaters will always be on. I hope you like it hot!
 
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Old 10-10-05, 03:41 PM
phoenix316
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Well since posting i have decided to run both heaters off the 1 thermo. So technically i can go from the panel to the thermo, then from the thermo to the 2 heaters ???? Not sure what would be the procedure for this. I know i saw the diagram somewhere for connecting 2+ heaters run off the same thermo but i can't remember where it is. Is it at all possible to go from the panel to the first heater, connect it to the second heater in parallel, then run another wire from the thermo to either of the heaters or somewhere in between so that i can control both?? Please help, I hate running more wire than absolutley necessary, especially in the walls, i would rather hide wire behind the baseboards (not the heater) as i have room under where the gyprock finishes and the floor starts.
 
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Old 10-10-05, 03:45 PM
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Straight 240 volt devices need to have both wires switched. In your situation, the easiest way to wire this is to run the 12-2 from the panel to the thermostat, and connect to the input of the thermostat. The output of the thermostat is then run to the first heater with another piece of 12-2. Then you run to the second heater with a third piece of 12-2.


If you wanted to run to the first heater before the thermostat then you would need to run a switch loop to the thermostat, two pieces of 1202 cable.

While I can't see your room, I can almost guarantee that it will be less wire to run from the panel to the thermostat and then to the first heater.

What part of this wiring don't you understand? The thermostat has four terminals (not including a ground). Two line terminals and two load terminals. The heater has two terminals (again, not including the ground). You can run from those same terminals to the next heater (most flexible), or most will have additional terminals at the other end that can be used to run to the next heater (last flexible).

If you want to make a run from the thermostat to each heater, then simply connect the second cable to the load terminals along with the wire to the first heater. The heaters need to be in parallel no matter where they are wired from.
 
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Old 10-10-05, 06:26 PM
phoenix316
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My thermo only has 2 wires, both black, is that bad??? I can live with going to the thermo first but where the 12-2 comes in it hits the first heater by default as it HAS to pass by it, that's why i am wondering if it can go the way i asked, to each heater, then the thermo interupting somewhere along the line, near the floor, as the thermo is like 5 feet in the air, on the other side of a door frame, where the wire runs on top.
 
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Old 10-10-05, 07:25 PM
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You need a different thermostat. You have a one pole thermostat, and you need a two pole thermostat. Buy a new thermostat.

Electrically you MUST go to the thermostat first. The wire can physically go to the first heater, but before you connect to the first heater you will need to run a cable to the thermostat and then one back to the first heater.
 
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Old 10-10-05, 10:08 PM
phoenix316
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I am currently using another single pole (2 wires) on another heater in my bedroom and it works fine. What's the difference? Performance?
 
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Old 10-10-05, 10:59 PM
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First, in your diagram, if either thermostat kicks on, it will short out the 240 volt line.

Second, in a 240V circuit, both lines are " hot " with respect to each other, with respect to any neutral wire, and with respect to earth ground. If you only switch one wire, the there is always one "hot" wire inside the appliance. While this accomplishes the desired electrical effect of ceasing current flow through the heaters, it is not safe (or legal)
 
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Old 10-11-05, 05:47 AM
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The issue is safety. A single pole thermostat is unsafe in a 240 volt setup. Also, SOME 120 volt thermostats won't work with 240 volts.
 
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