You must change your vacuum pump oil after every pull down... That's an old school teaching that I don't believe always applies, especially if you monitor your set up and pull downs closely. If pulling down a 9k mini split with 15' of new piping after a nitrogen purge, in most cases your oil will be good go for multiples of this situation. However, if pulling down a 15 year old 200 ton chiller, you may need to change your oil multiple times during a single pull down. On the flip side, the techs
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You must change your vacuum pump oil after every pull down... That's an old school teaching that I don't believe always applies, especially if you monitor your set up and pull
HVAC Know It All. HVAC Know It All · Original audio. You must change your vacuum pump oil after every pull down... That's an old school teaching that I don't believe always applies, especially if you monitor your set up and pull downs closely. If pulling down a 9k mini split with 15' of new piping after a nitrogen purge, in most cases your oil ...
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