T Stat Wire Colors

While there isn t an official standard for thermostat circuit wiring colors there is a general pattern.

T stat wire colors.

Item 244462 model 64169644. This wire connects to your heat pump if applicable. The rh wire connects to the heating system. Furthermore for the thermostat wiring colors code for this terminal if equipped consult with the installer.

But i don t see a wire going directly to the c wire. Rc power for cool rh not connected to rc jumper clip removed rh. Rh power for heat rh not connected to rc jumper clip removed or 4. Not used on the 3m 22.

So i guess i don t have a real c wire. The white wire connects to your heat. Orange this wire connects to your heat pump if you have one. If you don t know your system type place this wire into the w terminal.

Green the green wire connects to the fan. The yellow wire connects to your compressor. The thermostat wire is color coded so the technician can identity which wire goes to which port on each board. For example if the red wire is connected to w on the thermostat the furnace should turn on.

T outdoor temperature sensor. It s important to note that in some cases the color of the wire does not necessarily mean it connects to that came color one the board. The rc wire connects to the cooling system. Rh and rc single power for heat and cool.

White the white wire is what connects to the auxiliary heat on your system. Or v or vr. In most thermostat wiring hookups the red wire is the power source for the system. My old thermostat old mercury honeywell has the following wires.

The green wire connects to the fan. Thermostat schematic wire colors. Yellow the yellow wire connects to your compressor. Locate any unconnected wire labeled w or w1.

The most common color i ve seen used for this terminal and wire designation is light blue but this varies and is entirely up to the installer what color to use. Your best bet is to see the manufacturer s documentation both thermostat and hvac. Southwire 250 ft 18 5 thermostat wire by the roll. If you only have 4 wires they are typically red yellow green black.

Or r or vr. Here is the industry standard thermostat wire color code used for most systems. This could happen if the wires are swapped on both ends or if there s a spice in the wire. Blue to y green to g red to rh and white to w.

If in the previous step you identified an o b or o b wire that s connecting to the o b terminal and have a separate w wire place this wire into the w2 terminal.