I am not sure if this is what you mean but, 2 blue wires go to the thermostat polarity does not matter. red wire is the 12v hot wire, white is nuetral ground.
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their are 2 versions, one with 115 ac and one without, here the picture off of my nt-32
blue wire - Thermostat
black wire - 115 volt ac (if equipped)
white wire - 115 volt ac (if equipped)
red wire - 12 volt dc (+)
violet wire - 12 volt dc (-)
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