View 2 Wire Thermostat Diagram
Images. Nest heat pump wiring diagram: This article explains just what wire at a room thermostat actually controls.
Here is the existing thermostat wiring diagram for my heat and cool, 4 wire, single transformer system.
Anyone has any clue what / why the other black wire is connected to the y terminal (along with the yellow wire) on my existing thermostat. To understand which thermostat wire is connected to each terminal, we must first understand each wire's function. Diagrams are available for all warmup thermostats whether you are installing it as part of a. Wiring diagram (figures 14 and 15).
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