VARIABLE REFRIGERANT FLOW SYSTEM OPERATION IN LOW AMBIENT CONDITIONS

摘要

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

主权项

1. A system comprising:
a compressor coupled to a first coil through a first valve and a second coil through a second valve, wherein the first coil and the second coil are further coupled to a third coil, the compressor being operable to compress refrigerant and pump the refrigerant out of a first compressor opening into the first and second coils and receive the refrigerant through a second compressor opening after the refrigerant has passed through the third coil; a fan operable to blow ambient air across the first coil; a first expansion valve coupled to and positioned between the first coil and the third coil; a second expansion valve coupled to and positioned between the second coil and the third coil; a controller operable to trigger a low ambient temperature mode to:
monitor a pressure of the refrigerant;in response to determining that the refrigerant pressure is below a low threshold pressure, operate the first expansion valve to reduce refrigerant flow into the first coil and increase refrigerant flow through the second coil and into the third coil; andin response to determining that the refrigerant pressure is above a high threshold pressure, operate the second expansion valve to reduce refrigerant flow through the second coil and increase refrigerant flow through the first coil and into the third coil.