2 Wire Honeywell Thermostat Wiring Diagram. On a heat-only system one of the wires usually red goes on the R terminal and the other wire usually white goes on the W terminal. If you have a two-stage heat pump then you will also utilize terminal Y2 for the second stage.
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Remove Old Thermostat Faceplate. On a heat-only system one of the wires usually red goes on the R terminal and the other wire usually white goes on the W terminal. Our Wiring Diagrams section details a selection of key wiring diagrams focused around typical Sundial S and Y Plans.
2-Wire Oil Heat Honeywell T87F Thermostat wiring diagram. The wire for the Y terminal is usually yellow. A wiring diagram is a simplified traditional photographic representation of an electrical circuit. In some cases one of those wires may be your common.
