W1 is 1st stage heat, W2 is 2nd stage heat and X2 is for Emergency Heat. Install W1 wire to W/E terminal and W2 wire to W2 terminal. Given that Aux Heat and Emergency Heat are just one equipment.
Why does my thermostat have extra wires?
Do I need them to install my new thermostat? An extra unused wire in the wall can be used as the C wire for your new thermostat. The extra wire will also need to be connected to the C (common) terminal at the heating and cooling system. This will provide power to your new thermostat.
What does each wire mean on a thermostat?
The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color). You can also refer to the Conductor Color Chart (see Chart 6, thermostat wire).
What are the two wires in a thermostat?
Most two-wire thermostats wire have a red and white wire encased in a brown insulated coating. Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. Connect the white wire to the “W” terminal on the furnace and thermostat.
What is the difference between Y1 and Y2 on a thermostat?
In heat pump systems, Y1 controls your compressor, which heats and cools your home. If you have a two-stage compressor, Y2 controls your compressor’s second stage, allowing for different levels of heating and cooling.
What color is C wire for thermostat?
blue wire
The blue wire on the thermostat is the Common or C wire.
How do you identify C wire?
It is easy to see if you already have a c-wire connected to your system. Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter c. If this terminal has a wire attached to it, you have an active c-wire.
What is S1 and S2 on Honeywell thermostat?
The S1 and S2 terminals on the Honeywell are for a remote optional sensor. Your Honeywell may have been using the S1 and S2 terminal to determine when to switch from heat pump to gas.
What happens if you wire a thermostat wrong?
Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.
Can you use a 4 wire thermostat to 2 wire?
Yes, you can connect a four wire thermostat to this setup. Connect the white wires in the same manner as the black wires are connected.
Can I use a 2 wire thermostat on a 4 wire system?
Replacing an outdated four-wire thermostat with a newer model that uses two wires is not complicated, once you purchase the thermostat from a home-and-garden shop or hardware store. The procedure to install the new thermostat is straightforward and does not require the assistance of a certified electrician.
How many wires should a thermostat have?
The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a C or Common wire. That’s why we only need two wires: Red wire for power (24h).
What does system on +2 mean on my thermostat?
1 System On indicates when heating or cooling stage is energized. System On +2 indicates when a second stage is energized. 2 The word HOLD is displayed when the thermostat is in the HOLD mode. Temp HOLD is displayed when the thermostat is in a Temporary HOLD mode.
Where does Y1 wire go?
Let’s take a look at the G wire. This wire will go to the G terminal on your new thermostat. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. The O/B wire can have many configurations.
Can you jump Y1 and Y2?
applications, a jumper may be required between Y1 and Y2 at the furnace control in order to achieve the desired single stage cooling airflow. features require a jumper between Y1 and O.
Is the C wire blue or black?
Blue wires are also called C wires because they are the Common wire. C wires are necessary for any smart thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type. (It’s important to determine that your heat pump is compatible with your thermostat before you decide.)
Can the C wire be black?
The C wire’s color isn’t standardized, so its color can’t be guaranteed across all HVAC systems. It is most often either blue or black, unless the installer did their own rewiring to create a C wire.
Is the C wire Green?
Blue or Black C Common wire, may be unused by your existing thermostat. Enables continuous power flow from the Red wire.Red Rc 24VAC (dedicated to cooling call) Green G Fan.
Should C wire have voltage?
A C-wire, or a common wire, runs from your low voltage heating system (24v) and carries continuous power to your thermostat.If you do not have a low voltage heating system, you will not have a C-wire.
What is Y2 wire on thermostat?
Y2 is the thermostat wire for second stage of cooling. Y wire is for the first compressor (air conditioner units) and Y2 wire is for the second compressors (air conditioner unit). Y2 wires apply only if you have two air conditioner compressor units running from one AC thermostat.
Do I need a jumper from R to RC?
If you have a wire in the R terminal, and no wire in the RC terminal, use the jumper selector switch, the jumper plug, or a small jumper wire to connect the R and Rc terminals.If you have a wire in the R terminal, and another wire (not a jumper) in the RC terminal, you will not need to connect the R and RC terminals.
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