T Stat Wire Colors

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.

T stat wire colors.

White the white wire is what connects to the auxiliary heat on your system. 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. The yellow wire connects to your compressor. This wire connects to your heat pump if applicable.

Southwire 250 ft 18 5 thermostat wire by the roll. Furnace thermostat wiring diagram terminal letters on a thermostat and what they control the hot wire 24 volts usually red from the transformer is the main power wire to turn on or off a furnace components. The green wire connects to the fan. The thermostat wire is color coded so the technician can identity which wire goes to which port on each board.

The white wire connects to your heat. If you don t know your system type place this wire into the w terminal. Locate any unconnected wire labeled w or w1. Rh power for heat rh not connected to rc jumper clip removed or 4.

T outdoor temperature sensor. Not used on the 3m 22. The rc wire connects to the cooling system. While there isn t an official standard for thermostat circuit wiring colors there is a general pattern.

My old thermostat old mercury honeywell has the following wires. Orange this wire connects to your heat pump if you have one. Blue to y green to g red to rh and white to w. For example if the red wire is connected to w on the thermostat the furnace should turn on.

It also has a bridge from rh to rc another bridge from rc to c and yet another from a second c terminal to the y. If you only have 4 wires they are typically red yellow green black. Yellow the yellow wire connects to your compressor. But i don t see a wire going directly to the c wire.

This could happen if the wires are swapped on both ends or if there s a spice in the wire. So i guess i don t have a real c wire. Rc power for cool rh not connected to rc jumper clip removed rh. Thermostat schematic wire colors.

In most thermostat wiring hookups the red wire is the power source for the system. 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. If you have a heat pump system place it into the o b terminal. Green the green wire connects to the fan.

Item 244462 model 64169644. Or r or vr. Your best bet is to see the manufacturer s documentation both thermostat and hvac. Here is the industry standard thermostat wire color code used for most systems.

Or v or vr.