The temperature in the home is regulated by the wall thermostat. The thermostat can be powered by the furnace control board or buy batteries. The thermostat must be in a central location in the home positioned at eye level and away from direct sunlight for proper temperature regulation. When the thermostat detects an increase in temperature it closes the cooling circuit allowing voltage to travel to the control board. The control board uses a time sequence. To send one hundred and twenty volts of alternating current. To the circulation blower fan motor in the furnace and twenty four volts to the condensing unit contractor. When the condensing unit contractor is energized it allows two hundred and forty volts to flow through a nearby disconnect box to the compressor and condenser fan motor. The disconnect box which provides a way to turn off power to the condensing unit outside includes a cartridge which may contain fuses. If the compressor and condenser fan motor failed to work the disconnect box fuses can be tested for continuity to determine if a continuous electrical path is present. You can get more Information from http://www.onehourky.com/
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