How to Hook up Thermostat

  1. Turn Off Power to the HVAC System.
  2. Remove Existing Thermostat.
  3. Separate & Label Wires.
  4. Install a C-Wire if Needed.
  5. Install the New Thermostat Base and Wire.
  6. Mount Thermostat and Restore Power.
  7. Thermostat Wiring Tips.
  8. Tips for Installing Programmable Thermostats.

Where Do Wires Go from Thermostat?

Thermostat Wiring Tips

  1. The W wire is connected to your heating system.
  2. The Y wire is yellow and connects to your air conditioning compressor.
  3. The G wire is green and connects to the fan.
  4. Rc and Rh: The red wire(s) are the power source for your thermostat.

Where does thermostat wiring go? The white wire underneath your thermostat connects to your heating system. It terminates at your air handler or furnace. The white wire connects to terminal w in industry-standard thermostats.

How are thermostats connected? For the thermostat to work properly, the red wires must be connected to the correct corresponding terminal. The c, or common wire, provides smart thermostats with continual power. It’s usually blue, but it may also be black, brown or purple. The o or orange wire connects to your heat pump (if applicable).

Where Do the Wires Go on a 2 Wire Thermostat?

Thermostat color coding 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.

How do you wire a 2 wire thermostat? Unscrew the two wires from the terminals. Remove the motherboard of the old 2 wire thermostat and put the new 2 wire thermostat in its place. Reconnect the red and white wire, tighten down the set screw, and put the control panel back on. Test the 2 wire thermostat wiring by turning the furnace on.

What if my thermostat has only two wires? If your heating system has only two wires, the job of the thermostat is simple. All it has to do is turn the heat or the cooling on and off. There’s no auxiliary fan to worry about and no heat pump.

What happens if you wire a 2 wire thermostat wrong? If you get it wrong, the heat will run continuously. Once you have them paired, attach one pair to “24vac” (r) and the other to “heat call” (w) on the thermostat. Doesn’t matter which one, since the thermostat just shorts them either way.

The procedure to install the Nest thermostat with 2 wires is the same for both thermostats.

  1. Turn off the power to your HVAC system.
  2. Remove the existing thermostat and mark the wires.
  3. Install the Nest Baseplate.
  4. If you have a heat only system you should connect your thermostat wires to the W terminal and Rh terminals.

What Happens If You Wire a Thermostat Wrong?

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 jump the wires on a thermostat? Since the thermostat is basically a switch, you can bypass it just like you can bypass a wall switch, and if the furnace or air conditioner is working properly, it should come on.

Should my thermostat be on e or f? The thermostat fan operation switch, labeled fuel switch in the diagram below, is factory-set in the “f” position. This is the correct setting for most systems. If your system is an electric heat system, set the switch to “e”.

What Happens If You Incorrectly Wire Thermostat?

Problem # 5: incorrect wiring of the thermostat it only takes one wire that is incorrectly installed to not allow the system to work properly. This could cause high electricity costs, an uncomfortable temperature in the building, or the system to not work at all.

Can you jump r to c thermostat? You’ll wire the r wire from the heating system, to r or rh , and the r wire from the cooling system, to rc . Then you’ll have to wire the c wire from the cooling system, to the c terminal of the thermostat.