If your O or B terminal shares a label with another wire - typically W -identify whether you have a heat pump system or not. If you have separate O and B wires, tape off the B wire so it doesn’t make contact and connect the O wire to the O/B terminal. It can be W-O/B, O/B, W-O, W-B, or even separate O and B wires. The O/B wire can have many configurations. Of the Y, Y1, and Y2 wires, Y or Y1 go to the Y terminal and Y2 to the Y2 terminal. This wire goes to the G terminal on your new thermostat. If you have a C wire, place it into the C terminal on your wall plate.
In some cases, one of those wires is your common. If you have a Trane model thermostat and a wire labeled X or B, refer to your thermostat manual. Next, let’s talk about the C or common wire. If you have more than one wire (for example, you have a wire labeled R and another wire labeled Rc), remove any jumpers between the R and Rc terminals or push the switch to open the RC terminal to insert a wire. If you have two wires, R or RH go into the R terminal and RC into the RC terminal. The jumper may also be a wire connecting the two terminals. Thermostats may have a jumper switch, metal staple, or plug. If you have one wire - even if it’s labeled RC - it goes into the R terminal, setting the jumper connecting terminals R and RC in place. You typically have one or two of those three. If we recommend putting the W wire in the W terminal later in the guide, you will not move this wire, as we’ve already instructed you to place it in O/B.) (Example – You have a single wire labeled W-O/B, and we advise placing it in the O/B terminal. If we recommend placing a wire in a terminal, do not move it to another terminal if we address it later in the guide. You can re-connect the wiring after mounting the new thermostat’s wall plate. If a terminal has multiple designations like W and O/B, it will be labeled as W and O/B and not just one or the other.Īfter removing and labeling all wires, unscrew the old thermostat wall plate and mount the new thermostat’s wall Referring to your photo, remove and label each wire. Make a note of any present wire not connected to a terminal. However, you could see as few as two and many as ten. The most common configuration is five wires. You should typically see an 18-gauge solid core wire. If you see wires connected to terminals labeled G1 G2 G3, you need a thermostat capable of controlling multiple fan speeds none of our retail thermostats are compatible with this system type. This type of wiring requires a line voltage thermostat and is not compatible with low voltage thermostats. If you see thick, black, or red wires, you have a line voltage system. Your new thermostat may not be directly compatible if you see terminals labeled A B C, or 1 2 3, as your system requires a communicating thermostat. Make sure the terminal markings are visible. However, some lift from the bottom and lever off, and others have a locking tab. Most thermostats pull directly off the wall. Next, remove your existing thermostat from the wall plate. You can skip this step if you have a digital thermostat with a blank display. If you don’t hear or feel the system turn on within 5 minutes, the power is off. To confirm your system is off, change the temperature on your existing thermostat, so the system starts heating or cooling. To protect your equipment, turn off the power at the breaker box or switch that controls your heating and cooling.
#Heating diagrams professional
If you have a dual-fuel system, or are unsure, pause and contact a Professional HVAC Contractor.įollow the instructions below to guide you through basic wiring: *Trade model thermostats must operate “dual-fuel” systems, which use a heat pump for the first 1 or 2 stages and a gas or oil furnace for backup/emergency heating. O/B – Reversing valve for Heat Pump systems U – Humidifier, Dehumidifier, or Ventilator control See the diagram below for the role of each wire in your system: The thermostat uses one wire to control the primary functions of your HVAC system, such as heating, cooling, and fan. Consult your owners/install guide for wiring examples and systems compatible with your thermostat*. If you don’t know to which terminal each wire connects, it may be necessary to go to the HVAC system and look at the designations on the control board. When wiring, each wire should be identified by what terminal(s) it connects to - never by color. *There is no standard for which color wire controls each function.
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