ESCO Air Conditioning Practice Exam 2025 – The All-in-One Guide to Exam Success!

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What are the symptoms of a low refrigerant charge in an air conditioning system?

High suction pressure and high discharge pressure

High suction pressure and low discharge pressure

Low suction pressure and high discharge pressure

Low suction pressure and low discharge pressure

The symptoms of a low refrigerant charge in an air conditioning system typically include low suction pressure and low discharge pressure. A low refrigerant charge reduces the amount of refrigerant available in the system, which compromises the refrigerant's ability to absorb heat in the evaporator coil.

When there is insufficient refrigerant, the suction line pressure drops, resulting in low suction pressure readings. This is because the evaporator coil isn't receiving enough refrigerant to vaporize completely, leading to decreased evaporation and lower pressures. On the discharge side, the lack of sufficient refrigerant being compressed also leads to a decrease in discharge pressure, as the compressor is unable to build up adequate pressure from insufficient refrigerant moving through the system.

Overall, identifying low suction and discharge pressures is crucial in diagnosing refrigerant issues within an air conditioning system.

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