What is the color code for wiring 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).
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 are S1 and S2 wires on thermostat?
L: This terminal is designated for indicator lights on the thermostat, sometimes for when auxiliary or emergency heat is turned on, or if there’s a general problem with your system. S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat.
Where is the C wire on a thermostat?
Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter “c.” If this terminal has a wire attached to it, you have an active “c-wire.” If you don’t see a wire connected to your “c” terminal, you have a few options.
What is the blue wire for 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 happens if you touch thermostat wires together?
You Touched R and C wires. This causes the current in the circuit to be high, which may quickly overheat the wires. In a typical household circuit, the circuit would be protected by a circuit breaker (or fuse) which is designed to open (trip) to prevent damage to the wires in this situation.
Can you touch thermostat wires?
It’s “ok” in that if it works, you’re probably in the clear. However, there is a high risk of letting some of the thermostat wires in the bundle touch while doing this (the wrong ones) which would cause a short/surge back to the controller board.