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Air conditioning Does the thermostats wiring have a color coding scheme

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No,
most thermostat wiring is 4 core, because installers use phone cable -its cheap- but there is no accepted color code, and some systems use 2, or 3, or 4 of the wires.
there should be a standard.
terminals on thermostats and furnace, aircons are labelled, but the labelling is often contradictory. some thermostats have function to control the fan separately, some for the same aircon dont.
the manufacturers web site for your aircon,
should give a detailed explanation in install instructions which terminals are open on rise close on rise, heat/cool and how they are connected
the new thermostat should detail which of its terminals match those of the aircon.
test the cable before installing anything at the aircon or thermostat, a lightning strike can have shorted things normally impossible, and the lowV thermostat line could be at lineV and trash anything or anyone connected to it,

  • Lightning strikes are very unforgiving, please be careful, even if the lightning touched down yards away the voltage at large distances from the strike can be 10KV
  • paranoia impels me to recommend an electrician with test equipment for the lines, outside unit, cables and inside units, its better to check and be wrong, than not check and be wrong.

Posted on Jun 23, 2008

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f64f157.jpg

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