Quincy Compressor QED 650 Instruction And Maintenance Manual page 21

Instruction book
The liquid flows through refrigerant dryer/filter (206) to thermostatic expansion valve (204) via sight-glass
(211). The refrigerant leaves the thermostatic expansion valve at evaporating pressure.
The refrigerant enters evaporator (101b), where it withdraws heat from the compressed air by further
evaporation at constant pressure. The heated refrigerant leaves the evaporator and is sucked in by refrigerant
compressor (209) via liquid separator (207).
The dryers are provided with a sight-glass (211). The sight-glass allows the refrigerant flow in the line to be
checked. During normal operation, the liquid flow must be clear. In general, vapor bubbles indicate a shortage
of refrigerant. Note that fluctuations in the load may cause bubbles to pass in the flow for a short time. The
centre of the glass is provided with a moisture indicator which is green when the liquid refrigerant is free of
moisture. It will turn yellow when the refrigerant contains moisture, indicating that the refrigerant dryer/filter
(206) needs to be replaced.
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