VARIABLE REFRIGERANT FLOW SYSTEM OPERATION IN LOW AMBIENT CONDITIONS

摘要

A system comprising a compressor (100) coupled to a first coil (300A) through a first valve (200A) and a second coil (300B) through a second valve (200B), wherein the first coil (300A) and the second coil (300B) are coupled to a third coil (800). The system further comprises a fan (400A) operable to blow ambient air across the first coil (300A), a first expansion valve (500A) coupled to and positioned between the first coil (300A) and the third coil (800) and a second expansion valve (500B) coupled to and positioned between the second coil (300B) and the third coil (800). The system comprises a controller (700) operable to monitor a pressure of the refrigerant, operate the first expansion valve (500A) to reduce refrigerant flow into the first coil (300A), and operate the second expansion valve (500B) to reduce refrigerant flow through the second coil (300B).