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Old 01-17-2012, 10:47 PM   #1
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Double Pole Thermostat to Electric Baseboard


We are replacing our old 4 line thermostats for our electric baseboard heater. They are 240.

Anyhow, I just got the Aube TH115 -A 240 D to replace an old Thermostat (Electric Controls, Inc is the manufacturer)

AUBE Product
http://www.aubetech.com/products/pro...=11&noLangue=2

Anyhow, the wiring seems a little strange and was hoping to get some insight or help on this. Attached is a really simple of illustration of the wiring setup, as it was done originally, and how I tried to hook up the new one, which obviously isn't working



It appears to me that the line from the Baseboard to the Thermostat/Electric Box has the main load on a switch (red wire)?

If I wire the Two Black Wires together along with L1 from Thermostat, and wire T1 to the red wire, then cap off L2 and T2? would that do anything?
Or...

I thought I knew what I was doing but apparently I'm an idiot.

Thanks for any help.

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Old 01-18-2012, 12:45 AM   #2
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Double Pole Thermostat to Electric Baseboard


Was your old thermo a manual unit with no electronics? Your diagram would work if it was. Your new unit, unless it has a battery, would need to be connected differently to power the electronics. L1 and L2 from your new thermo needs to be connected to the black and gold lines of your supply. Break your gold line at the black circle and attach line 2 from your thermo to your supply gold line. Connect load 2 from thermo to the gold line going to your baseboard. You are showing 3 connections to the baseboard. Is that for 2 separate units or elements? You would have to tie the black and red of your baseboard together and connect to load 1 of your thermo. Caution!! Make sure the total wattage of the baseboard doesn’t exceed the 3600 watt rating of your new thermo.


Last edited by zappa; 01-18-2012 at 12:52 AM. Reason: spelling
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Old 01-18-2012, 01:19 AM   #3
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Double Pole Thermostat to Electric Baseboard


Thanks Zappa. I had a sneaking suspicion that I might have to break the white/white connection.

The old unit was completely manual, so that explains the difference.

Thanks for the warning. I'll check on the wattage rating tomorrow to confirm, but I think I'm okay.

As far as I know the third (red) wire coming from baseboard is for one unit, but possibly two elements. I'll check that as well. I thought it served as a switch on the manual thermo, but that's probably a wrong assumption.

Thanks again.

jv
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Old 01-18-2012, 04:22 AM   #4
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Double Pole Thermostat to Electric Baseboard


The incoming power goes to L1 and L2.

It looks like someone used xx-3 cable when they could have used xx-2. Baseboard heaters do not need a neutral.
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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 01-18-2012, 05:03 AM   #5
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Double Pole Thermostat to Electric Baseboard


Quote:
Originally Posted by jaredvallejo View Post
As far as I know the third (red) wire coming from baseboard is for one unit, but possibly two elements. I'll check that as well. I thought it served as a switch on the manual thermo, but that's probably a wrong assumption.

Thanks again.

jv
That would make sense (high/low) and could easily have been controlled by a switch on the thermo with your old wiring scheme.
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