MALFUNCTION DETECTION FOR FAN OR PUMP IN REFRIGERANT SYSTEM

摘要

A diagnostic method for testing a fan or pump assembly in a refrigerant system includes steps of operating a controller to periodically shut down, or reduce fan or pump speed for a short period of time, while continuing to operate the refrigerant system. Changes in an operating condition such as pressure, temperature, electric current or operating speed are monitored. If expected changes do not occur, a determination can be made that a fan or pump assembly is malfunctioning.