HOT GAS BYPASS THROUGH FOUR-WAY REVERSING VALVE

摘要

A heat pump four-way valve selectively routes refrigerant to either indoor or outdoor heat exchanger. The position of the plunger inside the valve can also be adjusted to selectively provide a hot gas by-pass function by routing a portion of refrigerant from discharge to suction line. The four-way valve preferably is positioned such that it can either operate in a conventional heat pump mode, or can be positioned to perform an unloaded hot gas by-pass function.