Baseboard Thermistat Wiring


  #1  
Old 03-29-01, 06:45 AM
Guest
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Question

I'm installing two baseboard 20 amp circuits.
#1) will have three heaters: 500,1000 & 2000 watts.
#2) will have a 1000 & 2000 watts.
I want to operate each heater with a seperate thermistat.
If I connect the heaters in series with 12-2 wire, what
type of wire do I use to run up to each thermistat.normal
120 volt circuit you would switch the hot wire. With the
240 volt heaters can I switch just one hot wire: therefore using one 12-2 wire to the thermistat?
Thanks,
Dave

[Edited by Raustadt on 03-29-01 at 03:35]
 
  #2  
Old 03-29-01, 09:54 AM
Wgoodrich
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YOur math does not add up. You will need to split these loads into more than just 2 - 20 amp 220 volt circuits.

YOu said circuit one has a 500, a 100, and a 2000 watt heater. This calculates to 3,500 watts. If you carried a load @ 100% on a 20 amp circuit you would only have available 2,400 watts. You would be pulling 1,100 watts more than a 20 amp circuit could carry.

You said circuit two has a 1,000 and a 2,000 watt heater. You would be pulling 600 watts more than that 20 amp circuit could carry.

HOw did you come up with your heater sizes. What size are the rooms these heaters are designed to heat? Where do you live or what is your heating degree day rating in your area ? What type of construction is your structure ? How many windows and doors ?

Wg
 
  #3  
Old 03-29-01, 10:17 AM
resqcapt19
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WG,
I think the post says that the circuits are 240 volts, not 120.
don(resqcapt19)
 
  #4  
Old 03-29-01, 10:37 AM
Wgoodrich
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Your right, I must have had a brain overload.

Wg
 
  #5  
Old 03-29-01, 10:40 AM
Wgoodrich
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If all heaters on the same circuit are in the same room, I would run the branch circuit from the panel to the thermostat then to the heaters and use a double pole 240 volt thermostat for baseboard heaters breaking both hot lines by the thermostat.

Hope this helps

Wg
 
  #6  
Old 03-29-01, 12:38 PM
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I need to control each heater ,they are in seperate rooms. I know how to wire with just one thermostat.I suspect that I'll need to run a wire up to each thermostat and back down to each heater along with wiring them in paralell.
Dave.


[Edited by Raustadt on 03-29-01 at 04:26]
 
  #7  
Old 03-29-01, 01:36 PM
Gary Tait
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Wire power to the thermostat boxes in paralell,
not the heaters.
 
  #8  
Old 03-29-01, 01:49 PM
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does it make any difference if I run the power to the thermostats or heaters in paralell? I figure about the same amount of wire. Or should I try to keep most of the connections in the thermostat boxes?


[Edited by Raustadt on 03-29-01 at 05:29]
 
  #9  
Old 03-29-01, 02:46 PM
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it would be better to run the circuit to the t-stats first, then to the heaters.
 
  #10  
Old 03-30-01, 02:57 PM
Gary Tait
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You'd have to run twice as much wire the way you want to do it, two wires one way, two wires back. You cannot simply break one of the line of a 220V circuit, you must break both lines.
 
 

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