ESCO Air Conditioning Practice Exam

Which condition will NOT result in increased head pressure in an HVAC system?

1. Dirty condenser coils

2. Overcharged refrigerant

3. Starved evaporator

4. Insufficient condenser airflow

The correct answer is: Starved evaporator

Incorrect Explanation The condition of a starved evaporator would NOT result in increased head pressure in an HVAC system. This is because a starved evaporator means that there is not enough refrigerant entering the evaporator, resulting in low pressure and low temperature. This would in turn reduce the amount of refrigerant being released into the condenser, thus preventing an increase in head pressure. The other options are incorrect because they would all result in an increase in head pressure. Dirty condenser coils would reduce the efficiency of the heat transfer process and cause the head pressure to rise. Overcharged refrigerant means that there is too much refrigerant in the system, which can lead to a higher head pressure. Insufficient condenser airflow can also cause a buildup of heat and an increase in head pressure.