The success of any HVAC application begins with choosing the right system and properly sizing the equipment. If a split air-conditioning system best suits the project, then observe these guidelines:

• Base your selection on a minimum coil suction temperature of 40°F for constant-volume systems and 43°F for variable-air-volume (VAV) systems. These limits promote stable performance over the system's entire operating range.

• Select the system using design conditions and check for proper operation at the expected operating extremes.

• Avoid using hot gas bypass in comfort cooling applications. It squanders energy and is seldom necessary for properly designed systems. If coil-frosting is a concern, consider adding an evaporator defrost control such as Frostat™ coil frost protection.

Continue on to Interconnecting Piping.