Simply connect the wire that connected to RH on the old thermostat to the R terminal on the new thermostat, and then connect the wire that connected to W on the old thermostat to W on the new thermostat, and you should be good to go.
What happens if you connect the wrong wires on a thermostat?
Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.
What happens if you wire a 2 wire thermostat wrong?
If you get it wrong, the heat will run continuously. Once you have them paired, attach one pair to “24VAC” (R) and the other to “Heat call” (W) on the thermostat. Doesn’t matter which one, since the thermostat just shorts them either way.
What if there is no Rh on new thermostat?
Some units don’t have an RH wire, but instead, they have an R wire. An R wire is similar to either the RC or the RH, so if you don’t have an RH wire, the R wire will be in place to control the heating system.
How do you wire a new thermostat?
Quote from the video:
Into the W terminal and the green wire into G or the fan tighten that one up as well. Okay. So we have the thermostat hooked up and then of course this wire goes into the wall and down to the furnace.
How do I wire a 2 wire thermostat?
Quote from the video:
It has constant voltage and when the thermostat demands Heat it bridges and gives power to the white which then feeds up to the heating element in the in the heating duct.
Can you hook up a thermostat backwards?
So if you put it in backwards, the water pump flow will push open the thermostat and cause it to take MUCH longer to heat up. When a thermostat is in correct orientation, there needs to be coolant flow, else the stat will be in dead zone and take longer to heat up.
What are the different wires in a thermostat?
FIVE WIRES
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 is the common wire on a thermostat?
The C-Wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. It’s a wire that (if you have one) runs all the way from your furnace to your thermostat.
How many wires does a thermostat need?
The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a “C” or “Common” wire.
What color is the C wire on a thermostat?
Blue wires
Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.
Are all thermostats wired the same?
For heating and cooling systems, it will have a red Rc and a red Rh wire. Though both wires are red, they are not interchangeable. For the thermostat to work properly, the red wires must be connected to the correct corresponding terminal. The C, or common wire, provides smart thermostats with continual power.
How do you wire a 5 wire thermostat?
Quote from the video:
I would have to attach it to the C terminal. If there was not a fifth wire I would have had to attach the wire here to the HVAC. And then run it down to the thermostat.
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.
How do you wire a 4 wire thermostat?
Quote from the video:
That is our 24 volt hot. So that our term the red wire goes to the our terminal. So we just press and slide it in make sure that it locks. And push it all the way then we can go to our green wire.
What is the blue C wire on a thermostat?
The Blue or C Wire
C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. Blue wires are for heat pumps. This wire connects to terminal B on your thermostat.
Is RC and C wire the same?
Typically, the wires that provide the power (often called the “hot” wires) are labeled Rc (cooling) and Rh (heating). They provide a source of 24V power coming from the HVAC control board. Sometimes they are separate wires and require separate connections. Other times they are the same wire.
What is G wire on thermostat?
G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat.
