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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.
Is Rh the same as R on 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. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry.
What does the RH wire do?
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.
What is Rh on thermostat wiring?
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.
Do I use RH or RC on Nest thermostat?
Nest thermostats don’t use jumper wires 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.
Does RH go to R or RC?
If you have two wires, R or RH will go into the R terminal, and RC will go into the RC terminal.
Are R and RH wires the same?
The “R” still indicates it’s a hot wire and terminal connection, and the “H” simply means heating. The RH wire connects to the RH terminal and controls the heating part of the thermostat.
What is a condensate safety switch?
The condensate overflow switch serves to prevent the pan from overflowing if the AC drain stops working properly. The switch is activated when the level of the water in the pan comes above a certain point, causing the switch mechanism to trip/float to rise.
What is RC and RH on ecobee?
With dual-transformer systems you’ll have two R wires—one from the cooling transformer (Rc) and one from the heating transformer (Rh). Learn how to install an ecobee thermostat in a dual-transformer system. Rc. If you don’t have an Rh wire, Rc serves as both the cooling and heating power wire.
What color is the OB wire on a thermostat?
It’s usually blue, but it may also be black, brown or purple. The O or orange wire connects to your heat pump (if applicable).
What is the 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. Sometimes it might be a single O/B wire instead of two separate wires.
Where does RC and RH wire go on nest?
Use the wiring diagram you got from the compatibility checker in step 4 to connect your system wires to the Nest Thermostat. 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.
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.
Is float switch Safe?
Again, this is a potentially hazardous situation as it can lead to water damage. A properly installed safety float switch prevents this from happening. If condensation starts to build up in the drainage line a small ball valve in the safety switch floats, signaling the compressor unit to turn off.
Does RH or RC matter?
Rh is power for the heating system, and Rc is power for the cooling system. It is actually very rare to have 2 power sources for a system. That is why many thermostats will have a jumper (connecting wire or circuit) to connect Rc and Rh.
What is the OB switch on thermostat?
The O/B terminal is for heat pump systems and is used for the reversing valve. When the “O” option/position is selected the reversing valve defaults to the heating mode. If the “B” option/position is selected the reversing valve defaults to the cooling mode.
How do you identify thermostat wires?
Look for connectors that have labels that are the same as your thermostat. For instance, you might find labels like R, W, G, Y, C or O/B. You should find wires attached to these connectors that are the same color as the wires that connect to your thermostat.
What color is ob?
European OB Full Color Code Chart Core # Color 93 brown/white/red 94 violet/white/red 95 pink/white/red 96 orange/white/red.
What color is ob wire?
O stands for orange and B for dark blue. The O and B terminals are for heat pumps; the B terminal is used in conjunction with Rheem, Ruud, or any other manufacturer that energizes the reversing valve in the heat pump’s heating mode.
What do the different color wires mean on a thermostat?
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).
Can you get shocked by thermostat wires?
No. You will not get a shock. Thermostat wires are low voltage low amp, and that is why they are left exposed and easy to access when you’re replacing or installing a thermostat, otherwise they will be shielded and covered and not out in the open.
What causes no power to thermostat?
No power to thermostat could also be caused by old batteries. When it comes to the controls and display on your thermostat, these are typically powered by batteries. Over time, these will wear out and stop working. If it has been a while since you changed these batteries, this could be your problem.
