Question about Heating & Cooling
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,
Posted on Jun 23, 2008
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Posted on Jan 02, 2017
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