C 24 vac common you might see blue purple or brown typically used for this wire. Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams.
3 Wire Thermostat Wiring Diagram 3 Wire Room Thermostat
Honeywell thermostat wiring diagram 4 wire. Nest wiring diagram 4 wires duration. There are only four wires going into the existing thermostat red green blue white. The red wire or 24 vac power lead is connected straight to the rc 4 terminals. The wiring for your honeywell thermostat depends on the functions of your heating and cooling system. Its there so you can supply power to the heating and cooling switches with a single wire which is usually red. Keep in mind that there should be a low voltage cable in the wall where the thermostat is located which has individual wires as shown in the instructions below.
Typical 4 wire thermostat t stat wiring examples follow. Substitute g wire for c wire install the honeywell wi fi smart thermostat with this video. Heat pumps are different than air conditioners because a heat pump uses the process of refrigeration to heat and coolwhile an air conditioner uses the process of refrigeration to only cool the central air conditioner will usually be paired with a gas furnace an electric furnace or some other method of heating. How to wire a honeywell thermostat with 4 wires. We have both a natural gas furnace and an ac unit. However your connections may seem a little different on the thermostat itself.
Y yellow wire for cooling enable g green wire controls fan on auto the diagram shows how the wiring works. Some have the common c wire while others do not. But here is a list of the most common wire color mappings as seen in many four wire t stat setups. Both examples of how to wire a honeywell thermostat with 4 wires are discussed below. The table above provides a more complete list of honeywell thermostat wiring colors and their uses. Inspirational honeywell thermostat wiring diagram for rth 3 4 5 wire a beginner s overview of circuit diagrams a first appearance at a circuit representation may be complex however if you can review a train map you can check out schematics.
How to replace a 4 wire thermostat. Youll probably see a thermostat jumper wire connecting the rc and rh terminals. Just take a look at the picture below the diagram. Honeywell thermostat wiring diagram 4 wire examples. The model number of the honeywell thermostat was not provided however here are the typical wiring assignments for a conventional heating system. We have a 19 year old condo with an old carrier mercury thermostat.
4 wire or 5 wire thermostat wiring problem question.
Gallery of Honeywell Thermostat Wiring Diagram 4 Wire
