In a thermostat, the R wire is responsible for powering the entire HVAC system (through a transformer). If you have both an Rh (Red-heat for powering the heating) and an Rc (Red-cool for powering the cooling), then the R wire can be connected to either Rh or Rc.
Is RC wire same as R?
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.
Do I use R or RC on thermostat?
If you have two wires, R or RH will go into the R terminal, and RC will go into the RC terminal.This wire will go to the G terminal on your new thermostat. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal.
What does the red wire go to on a thermostat?
Red or Rc Wires
Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer.Dual transformer systems refer to a setup with a cooling and heating transformer. These wires only connect to your cooling system. Rc wires connect to the RC terminals on your thermostat.
What color wire goes in RC?
Red
Thermostat Wiring Color Code Chart
| Marking | Wire Color Code | Description |
|---|---|---|
| Rc | Red | Power from cooling, 24 Vac transformer |
| Rh | Red | Power from heat, 24 Vac transformer |
| C | Black/Blue | Common of 24 Vac transformer |
| W | White | Primary heat cell relay |
Should 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.
Does R go to RC or RH ecobee?
If you only have one R wire (That includes R, Rc, and Rh), you’ll insert it into the Rc terminal on your ecobee. Do not jumper any R wires! If you don’t have an Rc wire, Rh serves as both the heating and cooling power wire.Learn how to install an ecobee thermostat in a dual-transformer system.
Do I need a jumper from R to RC?
If you have a wire in the R terminal, and no wire in the RC terminal, use the jumper selector switch, the jumper plug, or a small jumper wire to connect the R and Rc terminals.If you have a wire in the R terminal, and another wire (not a jumper) in the RC terminal, you will not need to connect the R and RC terminals.
What is RC on Honeywell 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.
What is RC or RH on a thermostat?
RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply. (Note: The RC and RH terminals are jumpered together in a four-wire heat/cool system and a single-stage heat pump system, but not in a five-wire heating/cooling system.)
What do the colors on thermostat wires mean?
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 thermostat wire controls the heat?
White
Learn Your Wiring
Here is the industry standard thermostat wire color code used for most systems: White. The white wire connects to your heat. Yellow.
What color wire controls fan on thermostat?
green
Some of the other wires powering your thermostat include: R-wire Power, usually red. G-wire Fan, usually green. Y-wire Cooling, usually yellow.
What wire do you use for a thermostat?
The most common thermostat cabling is 18/5 (18 gauge, 5 conductor), because 5 conductors typically offer enough functions for a modern thermostat/low voltage device.
Where does Rh wire go on thermostat?
The Rh wire connects to your heating system as opposed to your cooling system. This wire may be red without an H attached to it, depending on if you have a dual transformer setup. The Rh wire connects to the RH terminal on your thermostat.
Does Nest need RC and RH?
Nest thermostat connectors are built so that only one wire can be inserted into each connector.Instead of using jumper wires, Nest Learning Thermostats use an internal jumper between the Rh and Rc connectors. A Nest Learning Thermostat will automatically use this internal jumper if your system needs it.
Can ecobee control my HRV?
The Ecobee can control an HRV or humidifier but not both. The Ecobee will only control 1 of the HRV fan speeds and has a good humidifier frost protection option so I would use the Ecobee to control the humidifier. The Vanee Lite Touch Control #40270 is cheap to buy and would need 3 wires. B, G and Y.
What is AUX on thermostat?
Aux is short for auxiliary heat. If a heat pump is having a difficult time coming up to a certain temperature quickly due to extremely cold outdoor temperatures, the aux heat indicator means that a secondary heat source (generally gas or electric) has been deployed.
What happens if you short thermostat wires?
2 Answers. If you short the R wire to the C wire, you’ve effectively created a very low resistance closed circuit across the secondary of the 24V transformer in the HVAC system. This causes the current in the circuit to be high, which may quickly overheat the wires.
Does Honeywell thermostat need jumper wire?
If your HVAC system has both heating and cooling functions, you’ll need to connect both the Rc and Rh terminals with a red wire. Because many thermostats come with a pre-installed thermostat jumper wire that connects these terminals, you only need one red wire, which could be the thermostat Rc wire or the Rh wire.
What is RC and RH on ecobee?
The c in Rc stands for cool, the h in Rh stands for heat. The red wire connects to both by way of a jumper bridge. If you look closely at the image, you will see it. The Ecobee3 connects the Rc and Rh terminals automatically which means you can choose either Rc or Rh to plug the wire into.
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