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Some of the other wires powering your thermostat include: R-wire – Power, usually red. G-wire – Fan, usually green. Y-wire – Cooling, usually yellow.
What color wire controls fan on thermostat?
The green wire controls the fan or the relay controlling the blower. It connects to the Thermostat G terminal.
Which thermostat wire is the fan?
Thermostat Green Wire (“G” Wire) Green wire is for the fan. Mini-splits have an indoor air handler with a fan; the power input that goes into the fan is regulated by the green or “G” wire.
What are the color codes for thermostat wiring?
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 color is the common wire on a thermostat?
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.
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 does white wire do on thermostat?
The white wire underneath your thermostat connects to your heating system. It terminates at your air handler or furnace. The white wire connects to terminal W in industry-standard thermostats.
What color wire goes where on a Honeywell thermostat?
Meaning of Wiring Terminal Letters W (white) controls the auxiliary heating elements. Y (yellow) controls the compressor on the cooling system. G (green) controls the fan. C (blue or black) provides a return path to the transformer.
What is the B wire on a thermostat?
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.
How do you wire a second thermostat for a fan?
All you should have to do is remove the wire from the G terminal on your thermostat and run it to the W on the new thermostat. Then put a jumper wire from the RH on the original thermostat to the RH on the new thermostat. If you have a wire on the C terminal, you can also run a jumper to the C on the new thermostat.
Are thermostat wire colors Universal?
There is no universal color used for this thermostat terminal designation. * These colors may be different if the person who wired the thermostat didn’t use conventional color coding. Most technicians use the colors specified.
What color is the black wire on a thermostat?
Black Or Blue Wire (C) It is very important for a smart thermostat and helps to generate overall power. The Black or Blue wire allows you to connect it to the “C” terminal. However, in older models, you may not find the C-wire as it comes with limited functionality.
What if I have a black and blue wire on my 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.
What are the four wires in a thermostat?
In general, the heating wire (often white), goes into the “W” port, the cooling wire (often yellow), goes into the “Y” port, the wire that sends power from the HVAC system to the thermostat (often red), goes into the “R” port, the fan wire (often green), goes into the “G” port, and the common wire (often blue), which.
What happens if you wire a thermostat wrong?
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 is the W e wire on a thermostat?
W: Auxiliary heat, stage 1. E: Emergency heat (In emergency mode “Y” is not energized and E is energized to indicate the need for emergency heat. This mode is used if the heat pump fails during cold winter temperatures and the compressor must remain off.)Jun 1, 2015.
What does S1 and S2 mean on a thermostat?
The S1 and S2 terminals on the Honeywell are for a remote optional sensor. Your Honeywell may have been using the S1 and S2 terminal to determine when to switch from heat pump to gas.
What is the Y2 wire on a thermostat?
Y2 is the thermostat wire for second stage of cooling. Y wire is for the first compressor (air conditioner units) and Y2 wire is for the second compressors (air conditioner unit). Y2 wires apply only if you have two air conditioner compressor units running from one AC thermostat.
What does L1 and T1 mean on a thermostat?
The brand and type of thermostat would help to be certain. The L1 and L2 are probably the power connections; Line 1 and Line 2. T1 and T2 are probably the thermostat switch terminals. For heat, T1 and T2 contacts would “close” when the temperature is falling and it reaches the set point.
