I just wanted to share the typical procedure i use to pull a system down and see if you all could improve my procedure any.
1. system is usaully about 82 horsepower
2. a 26 cfm pump is used to it pull it down
3. i paint all fittings in vacuseal
4. i pull from several points in the system, ussaully an 1-5/8 line off the suction, a 7/8 line on the liguid header, two 7/8 lines off each side of the condensor, a another two 7/8 lines off each side of the heat reclaim coil
5. i use a robinar analog style micrometer (havnt found a reliable electronic one yet)the robinar is hooked up typically to the rack somewhere. I also use 2 yellow jacket electronic ones just for refrence points in reguards to looking for pockets . I put one on the oppposite side of the system at the rack and one down on the sales floor on the sys with the longest run.
6.If i have power i energize all controlls allowing valves to cycle through thier normal operations if i dont i manually run in all manual stems
7. i always start with fresh oil
8. first evacuation is taken down to 500 microns at which point i valve off all compressors isolating them from being pulled into any deeper of an evacuation
9. i pull it down twice more changing the oil inbetween each change
10. the entire process ussaully takes 4 or 5 days and i ussaully hit 50 microns or lower but it will typically climb 30 to 50 microns during a standing test on the final pull.
just curious if anyone has a more efficent way to do it