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. Y= the cool load.

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Besides, what does w1 and w2 mean on a thermostat?

W1 – Means first stage heat. Whether that is heat or cool is actually dictated by whether or not the O/B terminal is energized. This is why on many old thermostats you would jumper Y1 and W1 in a heat pump application. W2 – Means second stage heat.

Secondly, what does RH and RC mean on a 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. Yellow/Y is the AC compressor. White/W is the Heating element.

Similarly, you may ask, what is O and B on thermostat?

The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating.

What is the difference between y1 and y2 on a thermostat?

In heat pump systems, Y1 controls your compressor, which heats and cools your home. If you have a two-stage compressor, Y2 controls your compressor's second stage, allowing for different levels of heating and cooling. G or G1 controls your HVAC fan.

Related Question Answers

How many wires does a thermostat need?

In the most basic system, this functionality is provided by use of a fan center relay, and the low voltage wiring to the thermostat now will require a minimum of three wires (for heat only units) and four wires (for heat / cool / fan) for control.

What does Stage 2 mean on a thermostat?

Two-stage heating means the furnace has two levels of heat output: high for cold winter days and low for milder days. Since the low setting is adequate to meet household heating demands 80% of the time, a two-stage unit runs for longer periods and provides more even heat distribution.

Where does the orange wire go on a Honeywell thermostat?

This wire goes to the outside heat pump condenser, for reversing valve control. Finally, this is for heat pump thermostats. Orange Wire for O and Dark Blue Wire for B, depending on the installer of the heat pump and the manufacturer.

What does the blue wire do on a thermostat?

The blue wire, or C-wire, is known as the common wire. It's there to provide power to the thermostat. Older thermostats usually don't have a C-wire because they either don't need power or, if they do, they get it from a battery.

What is the difference between R and RC on a thermostat?

RC is no different and simply means red cooling. The wire is generally red, although there is no color standardization -- but more importantly, the "R" really means that the wire and terminal are hot; it's a live electrical wire. The RC wire connects to the RC terminal, which controls the cooling system.

How do I know if I have 2 stage cooling?

How Do I Know If I Have a Single Stage or Multi-Stage Heating System?
  1. Check your thermostat for variable heat settings, such as low and auxiliary heat.
  2. Locate the model number of your furnace, either by checking in the product manual or by looking directly on the front of furnace or inside the front panel.

What does R and C mean on a transformer?

In the most basic form of control, the C or common terminal of the low voltage transformer is connected in parallel to all of the control relays.. The R terminal of the low-voltage transformer is connected through the thermostat to each control relay.

Is RC the same as C wire?

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.

Is R and Rh the same on a thermostat?

R , Rh , and Rc are all the same, but not. In general terms, the R terminal is where you connect the signal voltage source. This allows current to flow from "into" the R terminal and "out of" the appropriate signal terminal ( W , Y , etc.) of the thermostat.

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 color is C wire?

blue

What is C wire?

The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application. It's normally used to provide a return path to power the thermostat. The “c” stands for common. It is often labeled as “c” on thermostat backplates.

Is y1 the same as Y thermostat?

If you have a dual transformer system, we strongly recommend a Nest Pro installation to prevent damage to your system. The W or W1 wire controls your heating system. In most systems, the Y or Y1 wire controls your cooling system. compressor is responsible for heating and cooling your home.

What do 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 thermostat x2?

X2 - Emergency Heat. O - Switches the heat pump from cooling to heating. G - Fan. Y - Compressor in both heating and cooling. T - Outdoor temperature compensating thermostat sensor.

Why is there a jumper between R and RC?

Rc and R are the same terminal. For nest you don't need a jumper. The reason for the 2 terminals is so you can use one thermostat for 2 types of units. Rc is for the indoor air handler when you run the AC.

What is a jumper on a thermostat?

A jumper wire is a short piece of wire connecting two terminals on the thermostat base. A jumper wire does not originate from behind the wall, but is unique to each thermostat. Sensi thermostat does not use jumper wires.

Will a Nest thermostat work with two wires?

Nest thermostats can work with systems that use Service Light (L) wires. While L wires can't be connected to the Nest thermostat, they don't need them. The Nest thermostat and Nest app will show you system status information without connecting L wires.

What are the four wires in a thermostat?

For Four Wires G – Fan (Green) R – 24 VAC/Rc/R/Rh (Red) Y – Compressor/Air Conditioner (Yellow) W – Heat (White)