High Head Pressures
A properly designed, installed and maintained system has considerable energy savings over the life of the system. Holding the system condensing pressure at a minimum level helps achieve this. Designing a system to operate at the lowest possible head pressure will be the most efficient.
Increasing the system’s head pressure increases the compression ratio of the high-stage compressors. This directly translates to an increase in the amount of work the compressors must perform (i.e., greater horsepower requirements and greater energy consumption).
Various conditions can cause high head pressure:
Dirty condenser coils
Extra hot indoor temperatures
Refrigerant flow restrictions
Condenser fan motors (slim chance)
Recycling of condenser air (slim chance)