This will effectively produce a saturated liquid in the receiver, at the same pressure you had before, which flashes when it hits the expanded volume of the sight glass. Yet when the blend sits in the receiver, it can "locally fractionate," or change composition slightly by shifting one of the components into the vapor space of the receiver. Blends will come out of the condenser slightly subcooled - at a temperature below the saturated temperature of the blend at the existing high side pressure. Ironically, this liquid in the receiver could be causing the problem, particularly when the equipment is in a hot environment. If one of the traditional refrigerants showed vapor in the sight glass it often meant there wasn't enough liquid refrigerant being fed to the valve, and more refrigerant was added to the system.īlends could show flashing for the same reason, however, they can also flash when there is plenty of liquid in the receiver. There are several reasons for bubbles in the sight glass. System is undercharge if bubble is large quantity and continous its means over charge
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