![]() If the expansion valve is adjusted incorrectly, you don't even have to add refrigerant to the system to do this. It is easy to destroy the valves in your compressor with an overcharge of liquid refrigerant. Trying to service a machine whose operation you don't understand is very risky. The best use of a sight glass by someone who isn't a refrigeration mechanic is to see whether a unit's failure to cool properly is due to a lack of refrigerant. Each evaporator on modern commercial dx refrigeration units is typically equipped with a thermostatic expansion valve, which meters the flow into the evaporator by sensing the presence or absence of liquid refrigerant at the outlet.Ĭapillary tubes are a cheap fixed metering device, usually used only on domestic refrigerators, freezers, and air conditioners that don't have to respond quickly to big changes in cooling load. Many years ago, some expansion valves were adjusted by hand in response to changing load conditions. If bubbles are present, a liquid/vapor mixture is present. A combination sight glass and moisture indicator is essential for easy field maintenance on any system, and is required on any field installed system unless some other means of checking the refrigerant charge is provided. In an R-12 system, the sight glass should be clear and colorless. It only shows if the liquid line fills with or contains bubbles. The heart of any air conditioning system is the refrigeration system. All direct expansion mechanical refrigeration units have either an expansion valve or a capillary tube to regulate the flow of liquid refrigerant into the evaporator. The refrigerant sight glass component is straightforward. ![]()
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