Thermostat Furnace Wiring

R the r terminal is the power. The line voltage feeding the furnace to operate the fan blower motor is transformed down to a safer level of 24 volts the gas control valve needs 24 volts to open and after making a series loop through at least one safety device the most basic and mandatory one is an over temperature shut down the power goes up to the thermostat and when the room temperature falls below the set point. It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit.

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Thermostat furnace wiring. Understanding thermostat wiring colors is the next step. Thermostat wiring and wire color chart thermostat wiring colors code. These run from the thermostat to the furnace and control the heat in a home. A thermostat turns your furnace and air conditioner on or off depending on the temperature in the room and the setting on the thermostat.

The thermostat is a set of contacts where g w and y are connected to r based on the following rules. A new or improved thermostat can help increase energy efficiency when running your furnace or air conditioner. 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 yellow wire connects to your.

This one is on the low voltage terminal board used to connect the furnace to the thermostat. Programmable and standard thermostats are installed the same way. My paperback and e book. In air conditioning mode the thermostat controls the fan so g fan is also connected to r.

Color of wire and termination. Two wire thermostats typically have a red and a white wire. For cooling the furnace usually selects the high speed of the blower. To wire a thermostat of this kind basic electrical skills tools and safety techniques are required.

Always turn off the power before starting work. If there is a call for cool r is connected to y compressor. To install your unit you ll need to connect the correct wires to the terminals on the back of your new thermostat. Here is the industry standard thermostat wire color code used for most systems.

This video is part of the heating and cooling series of training videos made to accompany my websites. For example if the red wire is connected to w on the thermostat the furnace should turn on. Wiring a furnace thermostat is a fairly straightforward electrical job. The white wire connects to your heat.

Use these tips to wire a.