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Old 12-24-2011, 10:58 AM   #16
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Help with baseboard heater relay


You will need a definite purpose contactor similar to this:
http://www.grainger.com/Grainger/SQU...124?Pid=search
You are controlling only one leg to each heater using the same t-stat so each leg gets connected to one of the poles.
You may still need a larger transformer. Hard to say.
The use of the term neutral was confusing. You need to power the t-stat as in the diagram which I thing you have done.


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Old 12-24-2011, 11:36 AM   #17
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Help with baseboard heater relay


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Originally Posted by 98mrd View Post
Hi - just joined the forum. I have been trying to figure out a problem for a while now and decided to (finally) ask for help.

My house is heated with baseboard heating. It was built in 1971. I recently replaced all the heaters with dimplex linear convectors and all the thermostats with honeywell digital programmable line voltage thermostats.

Everything is fine except for one room which is wired differently. Because the room is quite large, the heaters are powered off of two separate 240V 20A circuits. These are controlled by a White Rodgers 24A06G-1 relay connected to a 24V thermostat in the room. (The relay is connected to the electrical panel.) The problem is that it only supports a 2 wire thermostat, and I'd like my thermostat to match the rest of the thermostats in my house, so I need 3-wire.

I modified the relay itself, splicing in to create a separate neutral to power the tstat. That worked fine, except that the transformer can't generate sufficient current to power the tstat and also power both electromagnets that trigger the relay. The tstat works fine except only half the baseboard heaters go on (the ones on one circuit).

I'm looking for a new relay that will control 2 240V 20A circuits off one 24V 3-wire tstat. Does anyone know of such a product? Alternatively, anyone have any advice on another way to solve this problem?

Thanks in advance.
I have the same setup. Do you have the instruction book for the 24A06G-1? If not you can get it here http://www.emersonclimate.com/Docume.../0037-4165.pdf

This unit also works with heating and cooling, so one coil is for heat and the other for cooling, it can be set up that way, I don't use mine that way and I don't think you did either, but if it's not wired correctly it may think one relay is for cooling rather than both coils for heat, that could be why only one heater works. All of the 3 wire thermostats that I ever saw were for heat and cooling, can you wire it back the way that it was and just use 2 wires of the 3 wire thermostat?
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Old 12-25-2011, 02:52 PM   #18
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Help with baseboard heater relay


The two relays are in parallel - there is no difference between them really.

If I need a larger transformer, where could I get one? Any guess what specs I would need?
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Old 12-25-2011, 04:12 PM   #19
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Help with baseboard heater relay


See if the one in there now has a VA rating on it. Go to electrical supply house and get one that is larger 10-20 %
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Old 12-26-2011, 12:10 PM   #20
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Help with baseboard heater relay


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Originally Posted by 98mrd View Post
The two relays are in parallel - there is no difference between them really.

If I need a larger transformer, where could I get one? Any guess what specs I would need?
Did you look at the instructions that I included in the earlier post? This relay can be wired in two different ways, I struggled when I did mine as I didn't read the instructions as close as I should have. That said if you are still confident that you need a larger transformer each bimetal heater uses .21 amps. Its in the instruction book
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Old 12-29-2011, 01:00 PM   #21
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Help with baseboard heater relay


I've checked the wiring - it's not wired for heater/cooler functions. The two heater circuits in the relay are completely parallel. If one is triggered, the other should be too. The path is the same.

I can't get to a VA rating on the transformer without removing it, and it's riveted to the metal box for the relay. Not trivial to reach, although I may end up doing it eventually.

However, if the two relay coils require .21A each, and the thermostat can only handle .5A, it leaves only .08A for the thermostat to run - I don't know what a typical 24V thermostat requires to run. Does anyone have any idea?

My other idea was to wire 2 Aube 3 wire RC840T's together. I'm not quite sure how to make the connection. Does anyone have an idea on this? I know it can be done - the web page claims that you can control multiple relays with one thermostat as they require only .04A per relay. It does not show how to wire two of them together. I'm guessing you only power the transformer on one of the two, then maybe run them in series? Any help here would be appreciated.

Here's the link to the Aube thermostat. Honeywell has a very annoying policy of refusing to discuss their products with homeowners - I'd need an electrician or HVAC license.

http://www.aubetech.com/products/pro...=42&noLangue=2
http://www.aubetech.com/manuel/2/RC840T.pdf

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