![]() ![]() Modern R134a units use Ester (POE) oil, not PAG. High-side system pressure below 240 psi (1640 kPa):p>:pSummarizing: R-134a is very hard to adjust the recharge rate to so it's usually weighed into the system rather than depending on the sight glass method.:p:p High-side system pressure below 240 psi (1640 kPa)=1500 rpm).(It's normal for some bubbles to appear in the sight glass of R134a systems in low fan speed). The "sight glass charge inspection" can be used if the following conditions are met : ![]() The result is that the sight glass looks slightly cloudy even if the system is fully charged, except at very cool outside temperatures". PAG oil does not fully emulsify the way the mineral oil used with R12 would in the past. It uses a different type of oil, polyalkaline glycol (PAG). ![]() However, this is not applicable for R-134a. I've googled the subject and most of the technical articles have mentioned that in the days of R-12 refrigerant, the sight glass on top of the receiver-dryer would look clear when the system was right, indicating liquid refrigerant with no vapor bubbles. The weight of the complete refrigerant charge is the most accurate way to charge the system. ![]()
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