Answer :
Final answer:
Flooding of the evaporator coil in a system with a capillary-tube metering device is most likely caused by a 2) high refrigerant charge. This occurs when the system cannot adequately regulate an excess amount of refrigerant, leading to an overflow or 'flooding' within the evaporator coil.
Explanation:
On a system using a capillary-tube metering device, flooding of the evaporator coil can be primarily caused by a high refrigerant charge. This occurs when excess refrigerant enters the evaporator coil, leading to an over-saturation of the coolant. The capillary tube regulates the flow of refrigerant based on its length and internal diameter, and it does not actively adjust to the amount of refrigerant in the system like an expansion valve might. Therefore, if there is too much refrigerant, it cannot properly regulate its flow, resulting in flooding. A low refrigerant charge would lead to insufficient cooling, a blocked capillary tube could decrease or stop the flow of refrigerant, and a faulty expansion valve is not as directly related since systems with capillary tubes do not use an expansion valve for regulating refrigerant flow into the evaporator.
