A critical step in the installation of a built-up (field-piped) refrigeration system is the startup and commissioning of the equipment, which simply means verifying the operation of the system and its components. Although this seems obvious, it is a step that is occasionally skipped or done too quickly to be effective.
Many warranty issues could be avoided by taking the required time to accurately complete startup and commissioning. That is why on some larger HVACR systems, the equipment manufacturer may have one of their field technicians or an independent technician complete the system startup after installation.