There's a thermostat for that? (challenging problem!)

Old 03-07-14, 04:47 AM
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Exclamation There's a thermostat for that? (challenging problem!)


I am trying to find the right thermostat solution for my problem, but I am running into a lot of problems with HVAC terminology not exactly matching up with electrical terminology, and having problems finding what I need.

Note: I live somewhere that electrical codes do not apply to me. Do not hesitate to suggest solutions that work but may not be up to traditional code. Damnit, Jim, I'm an electrician, not a heating specialist.

I have two 1500W 120V space heaters which have sucky internal thermostats. I want to control them both in a more intelligent way.

The electrical service is 120V 30A, but I ran two 15A circuits to where both heaters are (same room).

The problem is that I can't seem to find a programmable digital 120V 30A total dual pole dual circuit thermostat that will do what I need. All of the dual pole thermostats aren't really dual pole in the overall sense of the term, and no distinction is made generally about this.

Now, if the solution is to use a line voltage or low voltage control system, I'm perfectly fine with either. I don't really know how the modern control line thermostat pinouts work, but your suggestions are more than welcome for ways to intelligently switch both these heaters on and off at the same time.
Old 03-29-14, 08:20 PM
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You could get a NEMA3 6x6x4 junction box to house a 2 pole 40 amp contactor with a 24volt coil and a 24 volt transformer to control your heaters with a 24 volt thermostat.
Old 04-16-14, 07:32 PM
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Another perhaps more elegant option is to use Honeywell YTL9160AR1000 Wireless Line Voltage Thermostat with RedLINK (as an option you can control your system from any computer/tablet/smartphone) and add one more Honeywell TLM1110R1000 RedLink Electric Heat Interface Module so you'll be able wireleslly control both of your heaters.
You don't need to run wires from thermostat to Heat Interface Modules and you don't need any wires to thermostat at all.
I have similar setup to control one space heater and 2 baseboard heaters.
Hope this help.

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