Y2 – This is the thermostat terminal for cooling second stage if your system is so equipped.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.
What does Y2 mean on thermostat?
second stage
Y2 is the thermostat wire for second stage of cooling. Y wire is for the first compressor (air conditioner units) and Y2 wire is for the second compressors (air conditioner unit). Y2 wires apply only if you have two air conditioner compressor units running from one AC thermostat.
What is W2 on Nest thermostat?
For a Nest Learning Thermostat: Y1 = Yellow (Heat/Cool) G = Green (Fan) O/B = Orange (Heat Pump) Rc or Rh = Red (Power) W2 = White (Auxiliary Heat) C = Blue (Common)
What is S1 and S2 on Honeywell 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 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 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 does W1 and W2 mean 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.
Where does W2 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 W2 aux on Nest Thermostat?
So it seems that Nest is not a good thermostat for my system. The W1 white wire goes into the W2/aux on the Nest. The W2 brown wire goes in to * on the Nest which is emergency heat. Nest only triggers W2/aux when you need auxiliary heat from the power strip. It only triggers * when you manually turn on Emergency heat.
What does W e mean on thermostat?
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 R and W mean on thermostat?
W wire heat. R wire heat power. W wire heat.
What is S1 and S2 on thermostat?
L: This terminal is designated for indicator lights on the thermostat, sometimes for when auxiliary or emergency heat is turned on, or if there’s a general problem with your system.S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat.
What does the W mean on a thermostat?
W=the heat load. On a call for heating the thermostat closes a switch between R and W, sending 24v to energize the heating circuit.
What color is W on thermostat?
General Thermostat Wiring Color Code
| Terminal | Wire Color |
|---|---|
| Rh | Red |
| Y | Yellow |
| Y2 | Light Blue |
| W | White |
What color is Y2 on thermostat?
Yellow
Thermostat Wiring Color Code Chart
| 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 |
Is W the same as W1?
W When you see a W terminal, it just means heat. Usually, you will only see W when the control only has one stage of heat. W1 Means first-stage heat. In a heat pump, first-stage heat is the same as the first-stage cool.
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’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 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.
What happens if you wire 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 Stage 2 mean on a thermostat?
When the thermostat on a dual-stage furnace reads Stage 2, it implies that the furnace is operating at the higher setting, giving you 100 percent of its capacity. Usually, the lower setting of a dual-stage furnace is sufficient to provide household comfort almost 80% of the time.
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