For example if the red wire is connected to w on the thermostat the furnace should turn on.
Gas furnace with ac thermostat wiring.
Most homeowners with moderate home improvement skills can wire a heat only thermostat.
Heat pump gas furnace air conditioner air handler etc with a variety of features.
The simplest setup for a heating system is a two wire thermostat.
Label where the wires are connected on the thermostat check to see if they match the industry standard listed above.
Once your c wire is ready follow these steps to install your new thermostat.
Heating and cooling equipment comes in many forms ex.
If any cooling like an air conditioner or fan control is required more wires are needed.
Moreover the heat source for a basic ac system can include heat strips for electric heat or even a hot water coil inside the.
The kind of heating and cooling system you have will determine how many wires run from your furnace to your thermostat.
It is actually fairly easy to install a thermostat to control a forced air furnace.
How to wire an air conditioner for control 5 wires the diagram below includes the typical control wiring for a conventional central air conditioning system furthermore it includes a thermostat a condenser and an air handler with a heat source.
It often comes down to what type of system was installed and the wiring or lack of wiring between that equipment and the thermostat.
The hvac equipment.
If the unit requires only two wires the system is only able to heat the space.
Furnace thermostat wiring diagram terminal letters on a thermostat and what they control the hot wire 24 volts usually red from the transformer is the main power wire to turn on or off a furnace components.
When the red wire is disconnected from w the.
Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams.
Heating only systems use two wires air conditioning adds two more wires and if you have a two stage furnace you ll need yet one more wire.
Turn off your existing thermostat flip the furnace ac breaker to the off position.