Hvac Wiring Diagram Colors

For hvac technicians and others who need to determine wire color code conventions connections for both new and older heating and cooling equipment heat pumps split systems etc here we give themost common conventions for identifying or connecting thermostat wires based on wire color and wiring terminal identification letter s. It shows the elements of the circuit as streamlined forms and the power and signal links between the devices.

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In either case it is crucial to find the wiring diagram for the unit.

Hvac wiring diagram colors. Basic thermostat wiring colors air conditioner systems always remember when changing a thermostat for a new thermostat to take a photo of the colors and where they go on the old thermostat or get a pencil and paper and write it down. Collection of hvac wiring diagram. Thermostat wiring diagrams furnaces.

The incoming 240v power is split into two legs. Thermostat wiring colors and terminals. It is better to take a good up close photo of the old thermostat and what terminals the colored wiring are terminated.

The color of wire r is usually red and c is black. Heat pump thermostat wiring a typical wire color and terminal diagram. However an installer may have used any color when installing the wire to the w2 terminal.

We will go over which speed each wire color is an. The red wire should always come from the hot side of the 24 volt transformer. A majority of the time the hvac wiring color is brown for this particular terminal.

Usually the electrical wiring diagram of any hvac equipment can be acquired from the manufacturer of this equipment who provides the electrical wiring diagram in the user s manual see fig 1 or sometimes on the equipment itself see fig 2. A wiring diagram is a streamlined traditional photographic representation of an electrical circuit. Each leg can provide 120v hot to neutral and the two legs together will supply 240v which is used to supply heavy loads such as air conditioning compressors and cookstoves.

A cooling system with two compressors or a two stage compressor need a y2 terminal so the thermostat is able to control the second stage of cooling. Homes in north america are supplied with a 120 240v single phase electrical service. As shown in the diagram you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals.

Therefore you will use the following color code for simple thermostat wiring. These two connections will ensure that there is power to the thermostat that you are operating. C is known as the common terminal.

Finally this way you can match up the appropriate wire color coming from the thermostat to what it controls in the equipment. Terminal r or terminal rh for the red wire. 2 how to get the electrical wiring for air conditioning systems.

Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler.

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