This must be verified by connecting the charging trolley and checking the gauge readings.Ī ‘foamy’ or ‘bubbly-looking’ sight glass indicates the system is low on refrigerant, and air has probably entered the system. Note – the sight glass may be clear but the system might be overcharged (too much refrigerant). It may also indicate that the system has a complete lack of refrigerant (this will also be accompanied by a lack of any cooling action by the evaporator). R12 systems generally use the sight glass for additional diagnostic information.Ī clear sight glass indicates the system has a correct charge of refrigerant. The sight glass should only be used to gain a quick response to a problem and should be supported using a charging/reclaiming station.īecause R134a refrigerant shows a milky colour when viewed with a sight glass it is not used a great deal for system diagnosis. There are several ‘indicators’ that help the service technician to diagnose possible problems. The main purpose of the sight glass is to visually check the condition of the refrigerant passing through the system. The sight glass can be used, by the experienced technician, to check the amount of refrigerant in the system. To obtain the maximum efficiency from the air-conditioning system, it is very important that it is charged with the correct amount of refrigerant. The sight glass is fitted into the top of the receiver-drier or built into the manifold gauge assembly.
A sight glass or water gauge is a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within.
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