What are the 5 wires in a thermostat?
5 Wire Thermostat Wiring (Any HVAC Device – Air Conditioners, Heat Pumps, Furnaces, etc.)
- Red wire for power (24V).
- White wire for heating (connected to W or W1 terminal).
- Green wire for fans.
- Blue or yellow wire for cooling (connected to Y).
- Black wire for “C” or “Common” wire.
What is a 5 wire system?
The fifth wire is an isolated neutral that carries all of the unbalanced return current. The measurements suggested that a ground relay could be set much lower on a five-wire system than a comparable four-wire system for improved high-impedance fault detection.
Are thermostat wires color coded?
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).
What is 5 wire cable used for?
Flexible portable cord or service cord is used for electrical power connections requiring flexibility in indoor and outdoor wiring applications. Grounded Wye or 5-wire systems are required in applications such as power drops and supply power for mobile equipment.
Where do I connect the blue wire on my 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, like orange wires. This wire connects to terminal B on your thermostat.
What if I have a black and blue wire on thermostat?
This the Common Terminal, and usually, a blue or black wire is run to the transformer from this terminal to complete the circuit, and in some cases, provide power to the Thermostat. This terminal is found on thermostats designed to work with Heating Pumps and is used to power the defrost cycle on the heat pumps.