Question: Where Do Thermostat Wires Go?

Does R go to RC or RH?

An R wire can go into a Nest Learning Thermostat’s Rc or Rh connector.

These are not jumper wires, and you can insert the Rc wire into the Rc connector and the Rh wire into the Rh connector..

What are the 5 thermostat wires?

Here is the industry standard thermostat wire color code used for most systems:White. The white wire connects to your heat.Yellow. The yellow wire connects to your compressor.Green. The green wire connects to the fan.Orange. This wire connects to your heat pump (if applicable).Red (C). … Red (H). … Blue.

Why does my thermostat only have 2 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 is also no thermostat blue wire, or common wire, to power the thermostat, so it has to operate on its own, either using batteries or mechanical temperature detection.

Where does the yellow wire go on a thermostat?

The yellow wires underneath your thermostat connect to your compressor. They control your air conditioning system. The yellow wires terminate at your compressor contactor via an air handler. The yellow wires connect to the Y terminals on your thermostat.

Where do the wires go on a Honeywell thermostat?

If you just have one wire, regardless if it’s labeled RC, it will go into the R terminal, and the jumper connecting terminals R and RC will be in place. Some thermostats have a jumper switch, some have a metal staple, others may have a plug, and the jumper may also just be a wire connecting the two terminals.

How many wires do I need for my thermostat?

Your most basic setup on most modern units needs 4 control wires plus the fifth blue “C” wire that provides power to the thermostat. It won’t cover anything elaborate like a heat pump, but your greatest risk would be the installer uses your wire to pull the wire they actually need.

Can I use a 4 wire thermostat on a 2 wire system?

Power comes in from the breaker box on 12-2 cable, enters the box where the thermostat is, and goes out along two lengths of 12-2 cables to two heaters. … 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.

What if there is no C wire for thermostat?

If your current thermostat didn’t need a C-wire, it (or a wire that can be used as a C-wire) might be rolled up inside the wall.

What is 2 wire thermostat?

If we put it simply, a 2 wire thermostat is one which has only 2 wires coming out of its backside. … When it comes to low voltage systems, a 2 wire thermostat is usually known as a “heat only thermostat” and is used for systems like a gas furnace (with only heating option).

Are thermostat wires live?

When it gets to correct temperature, one wire will be on (live in) and one off (live out). If not, its not working. Thermostats are measuring devices, typically they are at least 3-wire with a low voltage supply and a signal wire.

What color wire goes where on a thermostat?

If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat. Yellow/Y is the AC compressor. Green/G runs the fan. Blue or Black/C should be a ground and will be used by both Rh and Rc, and apparently your thermostat.

Where do thermostat wires go on furnace?

Thermostats use 24 volts AC from a transformer to control a furnace. The transformer steps down 120 volts to the 24 volts the thermostat needs, and sends out the 24 volts on two wires. The two 24 volt wires go to the R terminal and C terminal inside the thermostat.

How do I wire a Honeywell thermostat with 2 wires?

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 many wires go to a thermostat?

Communicating systems use only 4 wires. However, the basic wiring principle is the same: Each wire must connect to the furnace or air handler terminal and the corresponding thermostat terminal.

What happens if you wire a thermostat wrong?

Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself. Dual-fuel systems, a poorly located thermostat, whole-home humidifiers, or incorrect wiring can make the installation of a thermostat a longer, more frustrating, and more complicated …

What size is thermostat wire?

The most common thermostat cabling is 18/5 (18 gauge, 5 conductor), because 5 conductors typically offer enough functions for a modern thermostat/low voltage device.