What color wire goes where on a thermostat?
This is the most typical thermostat wiring style, and it applies to systems that regulate both heat and air conditioning. 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).
Does Rheem use O or B?
The O and B terminals are for heat pumps; the B terminal is used in conjunction with Rheem, Ruud, or any other manufacturer that energizes the reversing valve in the heat pump’s heating mode. Most other manufacturers of heat pumps will utilize the reversing valve for cooling including the O thermostat.
Where do the wires 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.
What is the O B wire?
O, B, O/B: These wires are responsible for switching the changeover valve in a heat pump system. The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating. Sometimes it might be a single O/B wire instead of two separate wires.
Should thermostat be on O or B?
The O/B terminal is for heat pump systems and is used for the reversing valve. When the “O” option/position is selected the reversing valve defaults to the heating mode. If the “B” option/position is selected the reversing valve defaults to the cooling mode.
What color is the OB wire?
Orange
Thermostat Wiring Color Code Chart
| Marking | Wire Color Code | Description |
|---|---|---|
| O | Orange | Change-over relay to cool relay |
| B | Blue | Change-over relay to heat relay |
| A | Heat and cool active to any relay | |
| L | Emergency heat active lamp |
How do you wire a new thermostat?
Here’s how to wire a thermostat using the color code and, FYI, each terminal’s purpose.
- Attach the red wire to the R terminal (Call for heating and/or cooling).
- Attach the green wire to the G terminal (Fan).
- Attach the white wire to the W terminal (Heat).
- Attach the yellow wire to the Y terminal (AC).
What are the four wires in a thermostat?
In general, the heating wire (often white), goes into the W port, the cooling wire (often yellow), goes into the Y port, the wire that sends power from the HVAC system to the thermostat (often red), goes into the R port, the fan wire (often green), goes into the G port, and the common wire (often blue), which
What is the AUX wire on a thermostat?
Some HVAC systems support auxiliary heat (AUX) as well as emergency heat (E).A thermostat senses this and automatically turns on electric heat strips to provide the additional heat needed. Some thermostats have an E wire. The E wire controls emergency heating.
What does the purple wire do on a Rheem Heat Pump?
Are you talking about gas or electric heat? The wire is used to turn on strip heat.
What is Y1 and Y2 on a thermostat?
Y/Y1 and Y2. In conventional cooling systems, Y/Y1 controls the first stage of cooling and Y2 controls the second stage, which helps cool down the home faster. In heat pump systems, Y1 controls your compressor, which heats and cools your home.
How do you know if wire is B or O?
Look for connectors that have labels that are the same as your thermostat. For instance, you might find labels like R, W, G, Y, C or O/B. You should find wires attached to these connectors that are the same color as the wires that connect to your thermostat.
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.
How do you connect 4 wires to 2 wires?
How to Connect a 4 Wire Line to 2 Wires
- Take the ends of both the 12-2 ROMEX® wire and the 12-3 ROMEX® wire and strip 1/2 inch of insulation off each wire. Push both ends into an electrical junction box.
- Look at the four wires of the 12-3 cable.
- Alternatively, use the red wire as the hot wire.
What does C mean on a thermostat?
common
The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application. It’s normally used to provide a return path to power the thermostat. The c stands for common. It is often labeled as c on thermostat backplates.
What does wo B mean on thermostat?
W/B: The W/B terminal controls the heat relay or valve. When the thermostat calls for heat, a signal is sent to power up the furnace and the blower fan or the boiler, heating your home. Y1: The Y1 terminal is used for the compressor contact in a single-stage heat pump installation.
How do you change a Rheem thermostat?
Remove the insulation covering from the face of the thermostat. Disconnect the electrical wires from the old thermostat using a screwdriver. Remove the thermostat from the water heater. Put the new thermostat in place and connect the wires using a screwdriver.
What type of wire is used for thermostats?
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.
Contents