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W2 – This is the thermostat terminal used for second stage heat. Many digital thermostats require 24 volts for power so the common wire is necessary. There is no universal color used for this terminal although black is often used. O or B – These thermostat terminals are for heat pumps.
What is W1 and W2 on thermostat?
In a conventional system, W/W1 controls your heating system and, where applicable, W2 controls your heating system’s second stage, which helps warm the home faster. 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.
What color wire is W2?
Traditional Thermostat Wire Color Codes Color Terminal Use Light Blue 2 Y2 Switched to Cooling White W Switched to Heating Brown 3 W2 Switched to Heating.
Does white wire go to W1 or W2?
Thermostat White Wire (“W1” or “W2” Wire) W wires go directly to the source of heating; that may be a furnace (gas, electric, oil, you name it) or heat pumps (mini-split heat pumps included). W2 is designated for two-stage heating. Most heat pumps include second-stage heating and require the white W2 wire.
Is W2 and e wire the same?
1-3 of 3 Answers. E and W2 wires are connected to the W2-AUX/E terminal together. In the south where I live E is for emergency heat and W2 is for second stage heat. Wiring can vary based on different systems; in some instances, you can not connect the E wire to the thermostat.
What is the difference between W1 and W2?
W1 is the classification we use for galvanized steel hose clamps (according to DIN3017) that are used in no-corrosion environments. W2 is the classification for stainless steel hose clamps (combination of AISI430 and zinc plated screw) that can be used in corrosion sensitive environments.
Can you jumper W1 and W2 on thermostat?
W1=Stage 1, and W2=Stage 2. Your thermostat wiring only has 5 wires. In order to support 2 stage heating, you’ll need to replace your thermostat wire with a 6 wire bundle instead. You would then remove the jumper between W1 and W2 and run separate connections to W1 and W2 on the Nest and W1 and W2 on the furnace.
What color is W on thermostat?
White Marking Wire Color Code Description W White Primary heat cell relay E Brown Emergency heat relay Y Yellow Primary cool call relay Y2 Yellow Secondary cool call relay.
Where does W2 wire go on Nest thermostat?
If you have a W2, Y2 or O/B wire, you can put it into the *O/B connector, if needed. Gently tug each wire to check they’re secure, and make sure each connector that has a wire stays down. Push the display onto the base until it clicks. Download the free Nest app so you can control your thermostat with your phone.
What do the different color wires mean 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).
Where does white wire go on thermostat?
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.
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.
What is the W1 wire on a thermostat?
The W or W1 wire controls your heating system. In most systems, the Y or Y1 wire controls your cooling system. If you have a heat pump, your Y or Y1 wire controls your compressor. Your compressor is responsible for heating and cooling your home.
What is W AUX on thermostat?
Alternate wiring, ON = heating mode, OFF = cooling mode) W: Auxiliary heat, stage 1. E: Emergency heat (In emergency mode “Y” is not energized and E is energized to indicate the need for emergency heat. This mode is used if the heat pump fails during cold winter temperatures and the compressor must remain off.).
What does the RH wire do on a thermostat?
What is the Rh wire on the Nest thermostat? The Rh wire is the power input to the heating system of your air conditioning. If the connection is not established, your air conditioning will stop working.
Where does e wire go on Honeywell thermostat?
The E terminal has a back-up heat source. If you have a heat pump package unit, the E terminal should be wired directly to the heating relay or the stripboard of the air handler.
Why is there a jumper between Y and W?
W is your heating circuit and Y is your cooling circuit. You do not need any jumpers with the nest however you DO NEED A COMMOM wire from the thermostat to the furnace.
What’s the difference between RH and RC on thermostat?
The RH wire refers to “red heating” which means that this is the connection you need in order to power the heating system of your air conditioning unit. The RC wire, on the other hand, refers to “red cooling”. It’s the same with the RH wire in that it powers the thermostat. For the RC, it powers the cooling system.
What wire controls heat on thermostat?
Thermostat Wiring Tips If your thermostat controls your heat, you will have a white wire. The Y wire is yellow and connects to your air conditioning compressor. The G wire is green and connects to the fan. Rc and Rh: The red wire(s) are the power source for your thermostat.
Which thermostat wire is emergency heat?
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.
