4 Wire Old Honeywell Thermostat Wiring
There are only four wires going into the existing thermostat red green blue white. G fan green wire.
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We have a 19 year old condo with an old carrier mercury thermostat.
4 wire old honeywell thermostat wiring. Aim a flashlight at the terminal block inside the wall to determine which screws are connected to the red and white wires attached to the thermostat. In this case we chose to give up control of the fan to power our honeywell wi fi t stat. If you have a c wire place it into the c terminal on your wall plate.
Loosen the screws on the terminal block with the phillips jeweler s screwdriver. In some cases one of those wires may be your common. When you only have 4 wires from the furnace to work with and you cannot run a new cable with more wires then you ll likely have to give up some functions of today s heat pumps central heating and central cooling systems.
The table above provides a more complete list of honeywell thermostat wiring colors and their uses. Unwind the four wires attached to the thermostat from around the screws. The model number of the honeywell thermostat was not provided however here are the typical wiring assignments for a conventional heating system.
Next let s talk about the c or common wire. 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. We have both a natural gas furnace and an ac unit.
4 wire or 5 wire thermostat wiring problem question. How to replace a 4 wire thermostat. Remove the wall screws holding up the thermostat before disconnecting the wiring to prevent the wires from falling into the wall.
All circuits are usually the same voltage ground solitary component and switches. C 24 vac common you might see blue purple or brown typically used for this wire. Old honeywell thermostat wiring diagram source.
Shut the power off and disconnect the old thermostat using the small flathead screwdriver. But here is a list of the most common wire color mappings as seen in many four wire t stat setups. If you have a trane model thermostat and have a wire labeled x or b refer to your thermostat manual.
Let s take a look at the g wire. Ross suggests taking a picture of the wiring configuration to keep track of which wire goes where. Remove the thermostat and dispose of it properly.
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