Always turn off the power before starting work.
Gas furnace thermostat wiring.
A dual fuel heating and cooling system also called a hybrid or packaged system is a combination of a heat pump for primary heating and cooling and a furnace usually gas or oil that provides a second and or third stage of heating.
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.
Assortment of lennox furnace thermostat wiring diagram.
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.
My paperback and e book.
Label where the wires are connected on the thermostat check to see if they match the industry standard listed above.
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Turn off your existing thermostat flip the furnace ac breaker to the off position.
When the red wire is disconnected from w the.
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The nest thermostat is compatible with these systems and supports up to 2 alternate heat sources.
A first appearance at a circuit layout could be complicated but if you could check out a train map you can read schematics.
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Wiring a furnace thermostat is a fairly straightforward electrical job.
Two wire thermostats typically have a red and a white wire.
The objective is the very same.
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These run from the thermostat to the furnace and control the heat in a home.
Once your c wire is ready follow these steps to install your new thermostat.