The pump down process is complicated by the need to connect a gauge set..
I used a vac pump to clean out the air in the gauge set, before hand..
Here's the method..
http://ecorenovator.org/forum/geothe...project-4.html
Bottom of the page I think..
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My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
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