What is the e W1 wire on a thermostat?

W1, W2, & E

1. W – When you see a W terminal, it just means heat.
2. W1 – Means first-stage heat.
3. W2 – Means second-stage heat.
4. W3 – This is just the next stage of heat after W2.
5. E – Is emergency heat, usually just a way to manually drive on what would normally be the secondary form of heat without stage 1 heating.

What is the e wire on a Honeywell thermostat?

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 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.

How do you connect two wire thermostat?

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.

What is the X wire on a thermostat?

An “X” or an “X” and Wi-Fi icon in the top-left corner of your thermostat means that your Sensi thermostat is either not successfully connecting with your home wireless network, or not communicating with the Sensi cloud servers.

How does thermostat wiring work?

Thermostat wiring consists of wires that connect the transformer to the system relays. When you move the lever on the thermostat to turn up the heat, this rotates the thermometer coil and mercury switch, tipping them to the left.

What is a thermostat wire?

Thermostat Wire. Thermostat wire is a class 2 power limited circuit cable commonly used for low voltage systems like HVAC controls. Primus Cable supplies 18 gauge thermostat wire ranging from two conductor to eight conductor variants. Manufactured with solid bare copper conductors, thermostat wire is coated with a sun resistant jacket.