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.
Further detail about this can be seen here. Keeping this in consideration, what is y2 on a thermostat?
Y2 – This is the terminal for cooling second stage if your system is so equipped. Finally, many systems only have a single compressor but if you have two compressors (or a two stage compressor) which should only operate off of one thermostat then you need the Y2 thermostat terminal for second stage cooling.
Beside above, what is the difference between y1 and y2? If you have one stage of cooling Y1 is the hook up. If you have two stages of cooling then Y1 is first stage and Y2 is second stage of cooling.
Similarly, it is asked, what does y1 and y2 mean on a thermostat?
Y, Y1, Y2: Whenever your thermostat calls for cooling, the Y wire is used to send a signal to your HVAC system telling it to fire up the air conditioner. Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. a high level for extremely hot or cold days, and a low level for mild days).
Is RC the same as C wire?
How It Works. Though it is a common notion, it may be incorrect to state that the C–wire powers the thermostat. Typically, the wires that give the power supply (usually termed as the ‘hot’ wires) are marked Rc (for cooling) and Rh (for heating). They give a 24-volt power supply from the HVAC system’s control panel.
What do the letters on a thermostat stand for?
The terminals have letters that refer to functions. R is transformer power, typically 24V AC. Rc is for a separate transformer power from cooling. W is heat, C is common. Y is for cooling.
How many wires does Nest thermostat need?
High voltage thermostats are often built into the wall and typically have two to four thick wires coming out of the thermostat. Wire nuts are often used to connect the thermostat to the system wires. Note: In some cases it is possible to make a high voltage system Nest compatible.
Does R go to RC or RH?
Here are some general guidelines: An R wire can go into a Nest Learning Thermostat’s Rc or Rh connector. The Nest Thermostat E only has an R connector, which is typically where an R wire would go.
What is cooling stage 2?
Two–stage cooling means the air conditioner or heat pump has a compressor with two levels of operation: high for hot summer days and low for milder days. Since the low setting is adequate to meet household-cooling demands 80% of the time, a two–stage unit runs for longer periods and produces more even temperatures.
What does Y mean on thermostat?
What do the thermostat wire colors mean?
The white wire is usually connected to the “W” terminal. The thermostat acts like a switch, like a light switch. The Red to white switch turns on the heat. Red to Green turns on the fan, Red to Yellow turns on the air conditioner.
What is the difference between RC and RH on a thermostat?
If the air conditioning thermostat has one transformer to power both the heating and cooling system, then the wire from the transformer goes directly to the RC terminal and is called the RC wire. Effectively there isn’t a second RH wire, although there is an RH terminal. This wire is also known as the RH wire.
Where does R wire go on nest?
The Nest Thermostat E only has an R connector, which is typically where an R wire would go. If you have separate heating and air conditioning systems, you might have separate Rh and Rc wires that come out of the wall and are connected to your system.
What color is C wire?
These are the most common colors and the labels used for thermostat wires: Blue or Black – C – The common wire. Red – R – 24 VAC power from the transformer in your furnace.
What happens if you wire a thermostat wrong?
Electric shock. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself. Dual-fuel systems, a poorly located thermostat, whole-home humidifiers, or incorrect wiring can make the installation of a thermostat a longer, more frustrating, and more complicated process.
What is o’b wire?
O, B, O/B: These wires are responsible for switching the changeover valve in a heat pump system. The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating. Emergency heat is only used if there’s a problem with your heat pump.
How do you identify thermostat wires?
- Blue or Black – C – Common wire, may be unused by your existing thermostat.
- 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.
- White – W – Heat.
- Yellow – Y – Air conditioner.