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Posted by tom b on December 16th, 2002 07:09 PM
In reply to Lux TX500 Thermostat by meggon on December 16th, 2002 05:52 PM [Go to top of thread]

A three wire system is parasitic (electricity wise) off of the furnace. Two wire runs off of batteries.

I believe this is correct (my brother does hvac work)

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