moving baseboard

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Old 09-11-14, 03:33 PM
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moving baseboard

I would like to move one of the baseboard heaters in the bedroom to the other side of the room and underneath the window. It is a currently run by a 24V thermostat with a transformer in the baseboard that buzzes so I am going to replace the baseboard also.

Current setup:
2 pole 15A breaker (30A total) running 3 heaters.
Bedroom 1: 24V thermostat 750W heater
Bathroom: 240V stat 500W heater
Bedroom2: 24V stat 1000W heater.

Some questions:
1/ As these are on 2 breaker connections, ie 2 circuits, 2 of these heaters must be daisy chained together?

2/ I can't fully understand the bathroom heater as I thought the setup with 240V thermostats was that the breaker connected to the thermostat and then the thermostat in turn connects to the baseboard. With this setup it looks like a white PVC cable comes from the panel into the baseboard and then a red PVC cable from baseboard up to the thermostat. Also, if it's 240V then shouldn't it be running off a 2 pole breaker? Maybe all 3 heaters are daisy chained? When I switch off the 2 pole breaker, all 3 heaters go off.

3/ If I want to move a heater to the other side of the room, I think I need to run a new cable 14/2 on a 15A circuit for 1000W. This bedroom is directly above the cupboard where the panel is downstairs so can I just drill through the floor on the wall side (down through girder/joist).
 
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Old 09-11-14, 06:31 PM
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You are supposed to run the 240v circuit to the thermostat and then to the heaters.
Not everyone does that.

You are supposed to break both connections of the 240v line with the thermostat.
Not everyone does that.

Two of the heaters may be daisy changed to one thermostat.

A two pole 15A breaker is 15 amps at 240 volts. Not 30 amps.

You'd better fully check out and understand how the wiring is done before you change anything.

A 15A #14 wiring circuit for a 1000w heater on 240v is fine.
 
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Old 09-11-14, 06:39 PM
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There are 3 thermostats though so each baseboard is run independently even though they are all on the same 2 pole breaker.
When you say "not everyone does that", is it then possible to control a baseboard with a 240v thermostat by connecting it as panel-->baseboard-->thermostat instead of panel-->thermostat-->baseboard?

How does the 240v thermostat control the on/off of the baseboard if it's connected last in the chain? This thermostat has 2 black wires coming out of it so not sure how it could connect to a 240 circuit, which is presumably 14/3 wire (2 hots 1 cold)...where does the neutral go?
 

Last edited by qwertyjjj; 09-11-14 at 07:00 PM.
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Old 09-12-14, 05:20 AM
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A 240vac thermostat for electric heat should have four wires.

I've seen two wire thermostats used that will only break one leg of the 240v power. That will control the heat on and off but there is still power in the baseboard. That would mean that if someone turned off the thermostat and tried working on the baseboard heater would be in for a surprise.

With 240v items like baseboard heaters there are only two hot wires and ground required.
If someone use three wire then the white is not used.
 
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Old 09-15-14, 02:43 PM
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Here's the manual for the one I have:
http://www.aubetech.com/manuel/1/TH104PLUS.pdf

It seems it depends on where you make the connection.
Source-->thermostat-->heater with 3 wire caps in the junction box & 2 in the heater OR
Source-->heater-->thermostat with 3 wire caps in the heater & 2 in the junction box
 
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