Wiring two 240volt baseboards and double pole thermostat

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Old 02-14-16, 04:41 PM
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Wiring two 240volt baseboards and double pole thermostat

Hi all. Is there anywhere I can get a clear wiring diagram on the right way to wire (2) 240 volt baseboard heaters and a (single) double pole thermostat? I have found plenty of wiring diagram pictures on the web but none that we exactly what I am trying to do.

John
 
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Old 02-14-16, 04:57 PM
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Welcome to the forums.

Will you be using one circuit to run both heaters ?
Is any of the wiring run yet ?

Describe for us exactly how you'll wire it.
 
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Old 02-14-16, 05:47 PM
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Hi and thanks for responding.

I have a single 220 volt whip in the wall available to me where a drier once lived so my desire is to use it. and he the reason I mention 2 heaters is because I have 2 8 foot sections of 220 volt baseboard for a 20 foot wall. I want them both on at the same time.

I understand I should wire the baseboards in parallel...
 
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Old 02-14-16, 07:12 PM
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You need to be careful of the total wattage.
You cannot exceed 3,850 watts on a 20A 240v circuit.
If it's a 30A circuit you can connect 5,760 watts.

What is the wattage of your heaters and what stat have you picked to use ?
 
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Old 02-14-16, 09:07 PM
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my wattage's and wire sizes all calc out, my biggest concern is wiring correctly the first time.
The stat is a Marley, same as the 2 baseboards.
 
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Old 02-15-16, 01:30 AM
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The connection is the easy part. How will you be wiring ?

You could take and connect your 10-2 w/ground from your old dryer circuit directly to the thermostat. You can then take one 10-2 cable to the first heater and then loop to the second heater.

Or you could use a larger/deeper box in the wall and bring your feed in and 2) two wire cables out to your heaters. You must use #10 wiring as that is what you breaker is sized at.

There are four wires on the stat...... two are from the power and two go to the heaters.
 
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Old 02-15-16, 07:56 AM
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So you are essentially saying I can use the 10/2 drier line that is on the wall now and pull 2 separate whips off THAT and feed the 2 baseboards through the stat that way?
 
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Old 02-15-16, 08:39 AM
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It is going to depend on the layout of the heaters. You can take a lead out to each heater or jump from the T-stat to heater 1 to heater 2.
 
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Old 02-15-16, 09:23 AM
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That's the type of answer I am seeking here. I have 2 new baseboard and new double pole stat and a 220 whip sitting there. I'll wire it anyway folks suggest.
 
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Old 02-15-16, 09:41 AM
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What is the easiest way for you to wire it ?
Keep in mind you are dealing with fairy heavy cable and need room to work with it.
A large, deep box will be needed if you end up with three cables at stat.
I recommend the first method.

With some baseboard heaters you can mount them end to end and connect thru them. That would be the ideal and easiest way to do the installation.

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Old 02-15-16, 09:51 AM
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Great. The Marley instructions suggest parallel wiring and there is a race to pass a wire through so I do not believe they can be daisy chained. Are your 2 options above both double pole stats?

Can we confirm the appropriate sized wire? The baseboards each 2000w and I won't exceed 40' of wire.
 
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Old 02-15-16, 09:56 AM
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It would be nice to use 12-2 but you can't. Your circuit is protected at 30A which means you must use #10 wiring at this point.

The double stat means...... two wires for power in and two wires for the heater out.

Daisy chaining just means connecting one to another in a row. No matter which wiring you follow.... the heaters are wired in parallel..... white to white and black to black.
 
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Old 02-15-16, 10:16 AM
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have a single 220 volt whip in the wall available to me where a drier once lived so my desire is to use it.
You will need a ground wire to wire for the two new 240 volt heaters. If the existing older dryer circuit is a 3-wire circuit with one Blk, one Red and one Wht, you don't have a ground wire.

The stat is a Marley, same as the 2 baseboards.
Is the thermostat rated for 30 amps?
 
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Old 02-15-16, 11:47 AM
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the tstat is rated for 40 amps
I have RED / WHITE / BLACK & GROUND
 
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Old 02-15-16, 12:31 PM
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I have RED / WHITE / BLACK & GROUND
You will use red, black, and ground. The white will be capped off. The white of any 10-2 will be remarked black or red or any color but gray or green on both ends. Bands of tape or permanent marker can be used for remarking.
 

Last edited by ray2047; 02-15-16 at 05:56 PM.
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Old 02-15-16, 05:48 PM
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So given that what is the color breakout if choosing wither of the diagrams below provided by PJmax? Either are fine with me, although I understand the 2nd diagram is more understandable to me.

Thanks everyone for helping me.
 
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Old 02-15-16, 05:53 PM
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You will use the red and black wires from the panel. You will not use the white wire and cap it off. You will be using the bare ground wire.

The red and black from the panel connect to the red and black line terminals of the stat.
The red and black load terminals supply the heater.

This installation is about as easy at it comes. You either use one cable to feed the first heater and then go to the second heater OR you run both heater cables to the thermostat. Like I mentioned.... you are working with heavy cable and need to be aware of the room it requires for connection.

You WILL NOT get three #10 cables in a standard electrical box. It must be a deep box or a large box.
 
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