Chill Out and Cool Down in 2025 – Master the Mohawk AC & Refrigeration Exam!

An overcharge of oil in a system with capillary feed leads to specific operational issues within the refrigeration cycle. When there is excess oil, it tends to accumulate in the evaporator and other components, which can hinder the flow of refrigerant. This accumulation restricts the refrigerant from absorbing adequate heat, which ultimately results in reduced refrigerant vapor volume in the evaporator. Because the evaporator is responsible for low-pressure, low-temperature conditions, a blockage caused by too much oil can lead to lower vapor pressures in the evaporator. This is why the situation could lead to a low suction pressure in the system.

Additionally, low suction pressure can create a cascade of negative effects, including poor cooling performance and inefficient system operation. This context emphasizes how an overcharge of oil disrupts the balance of refrigerant and oil within the system, leading to a low suction pressure scenario.