just wondering what you guys are doing when evacuating new systems where your only evacuating the new line set and the new coil
are you evacuating three time and purging with dry nitrogen . how long are you taking on new systems ?
one guy I know vacs for 15min 1st time puts in about 2 lbs nitrogen waits an hour vacs again 15 mins does nitrogen again waits another hour vac again this time down to 500 m
seem like a really long time to me on a fresh start up
I triple evacuate but i don't wait an hour with the nitrogen in it
thanks
Brad
I wouldn't triple evacuate unless I was repairing a contaminated system. It's a little overkill on a new 410a system. The last system I installed achieved a 95 micron evacuation.
Here's some info,
http://hvactechgroup.com/hvacforum/index.php?topic=818.0