Some thermostats have an E wire. The E wire controls emergency heating . Emergency heat is used when the HVAC system is not functioning properly (usually when the compressor is out of service). When you set a thermostat to emergency heat, the system bypasses the compressor and directly accesses the electric heat strip.
What color is E wire on thermostat?
| Marking Wire Color Code Description | C Black/Blue Common of 24 Vac transformer | W White Primary heat cell relay | E Brown Emergency heat relay | Y Yellow Primary cool call relay |
|---|
Where does e wire go on ecobee4?
The E wire normally connects to the ecobee's W1 terminal .
Is W e the same as W1?
Usually, the W/E terminal for first stage heating or Emergency heat, and it's the equivalent of the W1 terminal for Nest thermostats . As long as you configured your Nest thermostat correctly with the type of system you have, you should be good to go.
Does ecobee work with stranded wires?
For Ecobee thermostats, 120V and 240V systems (such as baseboard heating) will not work at all . ... Google Nest also points out that its thermostats won't work with systems that use stranded wires or stranded wires that are connected by a wire nut.
Where do thermostat wires go?
- Red wire for power (24V).
- White wire for heating (connected to W or W1 terminal).
- Green wire for fans.
- Blue or yellow wire for cooling (connected to Y).
- Black wire for “C” or “Common” wire.
Does your heat pump use an O wire or B wire?
If you have a heat pump and your thermostat doesn't have a separate wire labeled O, then the wire labeled B should be connected to the Nest thermostat's O/B connector.
What color is the common wire?
Red, Black, and White are the colors of switch wiring for three-ways. Red and Black are connected to the switches if the White is used for neutral. The White is often referred to as Common, but the colored wires are also used as hot wires.
Are R and RH wires the same?
The “R” still indicates it's a hot wire and terminal connection , and the “H” simply means heating. The RH wire connects to the RH terminal and controls the heating part of the thermostat.
Is RC wire same as C wire?
Typically, the wires that give the power supply (usually termed as the ‘hot' wires) are marked Rc (for cooling) and Rh (for heating). They give a 24-volt power supply from the HVAC system's control panel. ‘ If your system has a common wire, it will be marked ‘C' at most times.
What does R and W mean on thermostat?
W wire – heat . R wire – heat power. W wire – heat.
What color is W2 wire?
| Terminal Wire Color | W White | W2 Brown | G Green | C Blue/Black |
|---|
Does Y go to Y1 or 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.
Does R go to RC or RH ecobee?
The red wire has two R terminal connection points, Rc and R (sometimes called Rh) . The c in Rc stands for cool, the h in Rh stands for heat. ... The Ecobee3 connects the Rc and Rh terminals automatically which means you can choose either Rc or Rh to plug the wire into. It also means no jumper bridge is needed.
Can you use ecobee without C-wire?
Even though it comes with an adapter for missing c-wires, ecobee is what we'd pick even for systems with a c-wire. If you've got a 24v HVAC system but no C-wire, check out the ecobee product line . Every ecobee ships with an adapter that you can install yourself at your furnace to make up for a missing C-wire.
