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What thermostat wire labels mean If you don’t have an Rh wire, the Rc wire is the power wire for both your. heating and cooling systems. If you have an Rc and an Rh wire, the Rc wire is the power wire for your. cooling system.
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.
Will nest work with RC wire?
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. These are not jumper wires, and you can insert the Rc wire into the Rc connector and the Rh wire into the Rh connector.
Where does RC wire go on nest?
Note: If you have an R, Rc or Rh wire, you can put it into the R connector on the Nest Thermostat. 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.
What is RC in thermostat wiring?
Rc wires are for air conditioning systems or dual transformer systems. Dual transformer systems refer to a setup with a cooling and heating transformer. Rc wires connect to the RC terminals on your thermostat.
Do I connect RH or RC?
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. If you only have a single R wire, then it will only have an R connector, which is the connection you’ll use.
Should I use RH or RC?
RH is for the heating unit and RC is for the A/C unit. There will usually be two thermostat cables – don’t mix them up. 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.
Why is there a jumper between R and RC?
Effectively there isn’t a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat.
Is C wire the same as RC wire?
The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. Technically speaking, power flows from the R (red) wire, but not continuously (not on its own, anyway).
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.
Why is there no power to the RC wire?
The E73 error on your Nest thermostat indicates that there is no power detected to the Rc wire. To fix this error, check your wiring, air filter, drain tubes/drip pans, and HVAC fuse and ensure that all of them are working correctly.
Why does my Nest say no power to Rc wire?
This usually happens because the wire isn’t properly connected. It might also mean that the wire was incorrectly entered in the app. Check the system wires to make sure they are correctly entered and properly connected. Important: You must turn the system off before checking the system wires.
Why does my RC wire not have power?
Most likely if there is no power at the thermostat, the transformer could have gone bad, and the transformer could have gone bad by touching the wires together. On newer systems the transformer will have a either in line fuse or a little circuit breaker located on the side of it.
What color is the RC wire on a thermostat?
Red 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.
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. Y/O: The Y/O terminal is used to control the cooling condenser. When the thermostat calls for cooling, signals are sent to power up the condenser and the blower fan, cooling your home.
Is r the same as RC on thermostat?
R is transformer power, typically 24V AC. Rc is for a separate transformer power from cooling.
What does RH mean on Nest thermostat?
What is the Rh wire on the Nest thermostat? The Rh wire is the power input to the heating system of your air conditioning. If the connection is not established, your air conditioning will stop working.
