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23-12-2006, 01:37 AM #1
False Indication of Sight Glass when using R134a
Hi Gents,
I've heard that sight glass shall not be used to inspect refrigerant charge level in refrigeration systems using R134a. The reason is that R134a provides a false indication that the system is underchanged (bubbles) - when in fact it is not - leading to a refrigerant overcharge of the system.
In this case, the only way to verify system charge would be using a set of manometers at low and high pressure side ports.
Thanks and Merry Christmas !!