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 does W2 mean on thermostat?
second stage heat
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 W1 in a thermostat?
W1 Means first-stage heat. In a heat pump, first-stage heat is the same as the first-stage cool. It just means the contactor/compressor is turning on. Whether that is heat or cool is actually dictated by whether or not the O/B terminal is energized.
What are the W and W2 wires on a thermostat?
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 W the same as W1?
C: This stands for the common wire in an HVAC system, and it provides power to the thermostat.W, W1, W2: Just like the Y wire, the W wire(s) control the heating aspect of your system. O, B, O/B: These wires are responsible for switching the changeover valve in a heat pump system.
What color is W2 wire on thermostat?
| 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 |
What is W2 aux on Nest?
If the heat pump can’t heat the house, the W2/Aux wire will signal the electric elements in the air handler to come on and help out. Those electric elements can also be used as “emergency” heat if the heat pump doesn’t work. I just replaced the same thermostat with new Nest.
Where does W2 wire go on nest?
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 is W1 wire?
The W or W1 wire controls your heating system. Y or Y1. 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 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 W on thermostat?
white wire
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 white wire do on thermostat?
Here is the industry standard thermostat wire color code used for most systems: White. The white wire connects to your heat. Yellow.
What do furnace wire colors mean?
Red R 24VAC power from the furnace’s transformer. Red Rc 24VAC (dedicated to heat call) Red Rc 24VAC (dedicated to cooling call) Green G Fan.
What color is W1 wire?
Basic Thermostat Wiring Colors AC Systems Control Diagram
| Thermostat Terminal | Wire Color | What is Does |
|---|---|---|
| Y1 | Yellow | Cooling Terminal Condenser Control |
| Y2 | Light Blue but Varies? | Cooling Second Stage |
| W1 | White | Heating Control |
| W2 | Brown or Black but Varies? | 2nd Stage for Heat |
What’s the difference between RH and RC on thermostat?
Rh stands for Red-Heat and Rc stands for Red-Cool. If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat.
How do I reset my Honeywell thermostat?
To reset your Honeywell Thermostat, switch it off, remove the batteries, and put them back in reverse polarity: negative terminals facing positive. After 5 seconds, reinsert them the right way.
What’s the difference between W1 and W2?
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.
Which thermostat wire is emergency heat?
E wire
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 b wire on thermostat?
Blue
Thermostat Wiring Color Code Chart
| Marking | Wire Color Code | Description |
|---|---|---|
| Y2 | Yellow | Secondary cool call relay |
| G | Green | Fan relay |
| O | Orange | Change-over relay to cool relay |
| B | Blue | Change-over relay to heat relay |
Does red wire go to RC or RH?
There is no standard for the colour of the RH wire, but most units use a red one. 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 does Alt heat mean on Nest?
If a dual fuel system is installed, the Nest Thermostat will display ALT. HEAT or ALT. HEAT STAGE 2 if the alternate heating sources are engaged. Auxiliary heat will only turn on when the outdoor temperature is below the auxiliary heat lockout temperature.
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