Trying to install A smart wifi Thermostat I got an old Rheem

Thermostat Red Wire. Thermostat Wire Color Codes You Need to Know AireServ let's look at what each of these wires really is below Attach the Yellow wire to the Y terminal for AC/cooling mode

Red wires are 'hot' because they connect to the power source. One is for cool and the other is for heat, hence the abbreviation "RH" and "RC"

Simple 2 Wire Thermostat Wiring

There are different types of red wires that a thermostat could have, but in principle, a red wire is the power source for your thermostat There are different types of red wires that a thermostat could have, but in principle, a red wire is the power source for your thermostat Orange - This wire connects to your heat pump (if you have one)

Trying to install A smart wifi Thermostat I got an old Rheem. Without a connection to the red wire, your thermostat will not have a power source Some heat pumps or HVAC systems have separate transformers powering the heating and cooling systems

Basic Thermostat Wiring How to Wire HVAC Thermostat YouTube. Attach the Yellow wire to the Y terminal for AC/cooling mode Only air-source heat pumps connect to your outdoor condenser