Power in a baseboard heater thermostat

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  #1  
Old 11-13-12, 09:41 AM
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Power in a baseboard heater thermostat

Hi all. I have a couple of 240V baseboard heaters I'm installing in a room I'm finishing. I purchased a Honeywell RLV430 thermostat, which has a little LCD display, programmability, etc. What I am wondering about is how the thermostat itself gets its electricity to run its own functions. The only connections that exist are two 12 gauge wires, with the instructions stating that one of the hot lines in my 12/3 should pass through this.

OK, so the thermostat simply opens or closes the circuit. That's fine, as far as powering the heaters. But what about powering the thermostat? There are zero other connections to this thing, no common, no ground, etc. And it is NOT battery powered for the thermostat functions.

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Old 11-13-12, 10:01 AM
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No expert....but from looking at the wiring instructions, it seems that it's letting a tiny bit of current through all the time, just enough to power the stat. In fact, unless it's completely battery operated (which I see no mention of)...it pretty much has to work that way.
 
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Old 11-13-12, 02:05 PM
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Thank you kindly. And here are more characters to hit the arbitrary 25 minimum.
 
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