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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 W1 in 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.
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.
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.
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 is white wire 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 does each wire do on a thermostat?
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.
Where does W2 wire go on thermostat?
This wire should go directly to the heating source whether it be a gas or oil furnace, electric furnace, or boiler. White for W Terminal. W2 – This is the thermostat terminal used for second stage heat.
What color wire goes where 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).
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.
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.
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.
Why is there a jumper between Aux and E?
The jumper between Aux and E was installed to allow emergency heat or aux heat from the RTH7000 to turn the the electric heat in the indoor air handling unit.
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 color is the C wire?
Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.
What does S1 and S2 mean on a thermostat?
The S1 and S2 terminals on the Honeywell are for a remote optional sensor. Your Honeywell may have been using the S1 and S2 terminal to determine when to switch from heat pump to gas.
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.
What is the B terminal on a Honeywell thermostat?
W/B: The W/B terminal controls the heat relay or valve. 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 does O and B mean on a 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.
