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FURNACE WIRING DIAGRAM OLDER FURNACE


Thermostat Wiring Explained - Electrical Online
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),..
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