Air Conditioning
The basic principles of air conditioning are actually pretty simple. You have a condensing unit outside, which has a fan, coil, and compressor. Inside you have a evaporator coil which sits on top of your furnace and the only part of the furnace that will be used is the fan. When your thermostat calls for air conditioning the compressor, condenser fan, and indoor blower should come on. The compressor pumps out hot refrigerant gas into the condensing coil. The condenser fan removes heat from the gas by sucking air through the coil. When the refrigerant leaves the condenser it will be in a liquid state. The refrigerant then travels through the line set. The line set is nothing but two copper lines connecting the condenser to the evaporator coil. The liquid line is the smaller one and carries the liquid from the condenser to the evaporator coil. Before the liquid refrigerant hits the evaporator coil it passes through a metering device. There are two different styles of metering devices, TEV(Thermal Expansion Valve) or fixed orifice. The metering device sprays the refrigerant into the evaporator coil. When air passes through the evaporator coil the air transfers heat to the refrigerant. Causing the refrigerant to turn to vapor. The refrigerant is all vapor leaving the evaporator. The refrigerant vapor then enters the line set and travels down the bigger of the two, the suction line, and returns to the compressor.
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