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The wire in the W2 connector controls the second stage of heat. If you have a heat pump, the W2 wire may control your auxiliary heat.
What is the W2 terminal on a thermostat?
W2 – This is the thermostat terminal used for second stage heat. There are gas furnaces with low fire and high fire and some depend on control from a two-stage heating thermostat with a W2 terminal. Heat Pumps use staging for auxiliary heat and need a W2 terminal.
What is the difference between W1 and W2 on a 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.
Should I use W1 or W2?
W1 – Means first-stage heat. W2 – Means second-stage heat. It could be the first stage of heat strips in a common southern heat pump, the gas furnace backing up the heat pump in a modern “hybrid heat” application, or just a second heat strip bank in the case of a straight electric system.
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?
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.
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.
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 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 does RC and RH mean on a thermostat?
RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply. 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.
What is W2 on Trane furnace?
W2 – This is the terminal used for second stage heat. There are gas furnaces with low fire and high fire and some depend on control from a two-stage heating thermostat with a W2 terminal. Heat Pumps use staging for auxiliary heat and need a W2 terminal.
What does o’b mean on thermostat?
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.
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 is 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.
What are all the wires for on a thermostat?
Thermostat Wiring Tips The W wire is connected to your heating system. 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.
What color wire goes where on a Honeywell thermostat?
Meaning of Wiring Terminal Letters W (white) controls the auxiliary heating elements. Y (yellow) controls the compressor on the cooling system. G (green) controls the fan. C (blue or black) provides a return path to the transformer.
How do I know if I have an O or B wire?
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.
Where does the orange wire go on a thermostat?
The orange wire connects to terminal O on your thermostat. The orange wire only applies to homeowners with an air-source heat pump. Only air-source heat pumps connect to your outdoor condenser. Homeowners with geothermal heat pumps have no use for the orange wire.
How do I stop Nest from using auxiliary heat?
How to Turn off Aux Heat on Nest Thermostat Open your Google Home app. Select the Nest thermostat. Click “Settings”, “thermostat”, then “Emergency Heat.” Select “OFF.”.
