2-wire heater vs. 4-wire programmable tstat

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Old 10-20-08, 08:43 AM
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2-wire heater vs. 4-wire programmable tstat

I have a two-wire heater (red and yellow wires) and I am trying to make it work with a four-wire programmable t-stat. Is this possible? I hooked the red and yellow wires, but nothing works. t-stat is ok - I had it on another application requiring four wires (both heating AND cooling).

thanks, Harry
 
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Old 10-20-08, 07:57 PM
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It should work, what is the make and model of the thermostat?
 
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Old 10-21-08, 05:46 PM
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2-wire heater vs. 4-wire programmable tstat

The thermostate is a Lux 500 with an Energy Star picture on the front of it. It worked in my main house with the gas heater and electric AC (4-wire system). I bought a new identical one to put in my shop that has a gas Modine 40,000 BTU heater with 2 wires instead of 4. The Gas Modine current analog t-stat clicks on (ignites the burner) and then kicks on the fan to circulate when the heater is warm. I did a swap from house to shop garage and both work in the house...? I have red hooked to red, and yellow hooked to yellow, and have left the other two color screws on the t-stat vacant.
 
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Old 10-21-08, 07:31 PM
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For two wire system. you want a wire on R (power) and another wire on W(heat). The Y is for cool.
 
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