240v Electric Baseboard Heater Wiring Diagram – Stack Exchange Optimization is a question and answer site for large contractors and employers. It only takes a minute to register.
I have already run the wires from the electrical box (not connected) to the thermostats and heaters (not connected) now I need to know which wire should be connected in order. It is a red and black 12/2 gauge. Thank you.
240v Electric Baseboard Heater Wiring Diagram
In the first junction box with the first thermostat, connect with the wire nut the black wire from the panel, the black wire in the next junction box, the short pigtail wire to the thermostat. Connect with another nut the red wire from the panel, the red wire to the next junction box, the red wire to the first heater. Connect the black wire from the heater to the other thermostat connection. Connect the ground wire from the panel to the junction box then to the wire nut, and the ground wire to the second junction box and to the heatsink.
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In the second junction box with the second thermostat, connect the black wire from the first junction box to the thermostat. Connect the red wire from the first junction box to the red wire from the second heater. Connect the black wire from the heater to the other thermostat connection. Connect the ground wire from the first junction box to the second junction box, then to the wire cover and the ground wire to the second heater.
I have a two pole 20 amp circuit that I plan to run 3 base board heaters and 2 line voltage thermostats. I have already made sure that the water consumption of the 3 heaters will not exceed 3840 watts. I ran a 12/2 wire from the breaker to the first thermostat zone that will control the 2 baseboard heaters and from there to the other thermostat that will control the 3rd heater. I installed a quick sketch for visual reference. I believe I know how to set this up properly, but I just want a sanity check before I do. I believe I can only pull 1 controller to pass power to the second controller area (bedroom) and with the thermostat controlling the two baseboard heaters, it appears that the wiring is straight. Any help is appreciated!
By connecting the wires to the 2nd part and the line side of the thermostat 1 you will find what you are looking for here. However, with a thermostat and 3 12/2s in it, that’s too much for most stand-alone boxes (20.25 cu. in. box infill vs. a standard large code box being 18 in3), so you’ll want to use a box a larger one like a 4″ square and one cover/fender instead. You’ll also want to wrap each white wire with black tape to indicate it’s hot, not neutral.
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IMPORTANT: The number of heaters you can connect to one thermostat depends on your circuit size and wiring.
The number of heaters you can safely wire to the thermostat will depend on the size of your circuit breaker in the electrical box, the type of wiring you are using, and the wattage of the individual heater. In general, 240V circuits are recommended for connecting multiple heaters to a single thermostat, as 240V operates at a minimum. A 240 volt circuit operating on a 20 amp pole circuit breaker can have any combination of heating elements up to 3840 watts. For example, using one thermostat, you can install:
IMPORTANT: You must wire the heaters in parallel, not in series, when using them with a single thermostat. If you are uncomfortable with electricity, call an electrician.
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All heaters must be wired in parallel. You can either do this by connecting each radiator directly to the thermostat, or by connecting each radiator to the next – just make sure each radiator is connected to the wire from the source. Refer to the wiring diagram above. Stack Exchange Optimization is a question and answer site for large contractors and employers. It only takes a minute to register.
I have a question about the wiring for the old Pacific baseboard heater thermostat. I pulled this thermostat 2 weeks ago thinking we were going to get rid of the thermostat. Now we decided to put the heat on, and I don’t remember how the thermostat was connected. The heat box has two lines: one input, one output. Each line has 1 black, 1 white and an empty ground. I am attaching a picture of the back of the thermostat. It has only 3 connection points. Columns 2, 3 and 4. Can someone help me and tell me which hooks correspond to each column?
This is a split phase 240V, so the two hot spots are the same. White wire should be considered one of the 8 legal warm colors, as it is neutral. If I were wiring the duct, with a choice of one of the 8 colors, I would use black and black as the main parts are interchangeable; there is no need to distinguish fire from each other.
This thermostat is a single pole. They make a bipolar version where terminal 1 is manned, to which man connects 1-3 and also 2-4. This only leaves terminal 3 as a simple link block, never connecting to any other terminal.
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Select one wire from each cable; join them (no matter how long they are valid, feel free to use terminal 3 as a link block).
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