First time I've ever used a micron guage. 410a split system. I pulled vacuum and here are my results:
Pump shut off at 144 microns.
+1 hour: 275 microns (131 increase).
+1 hour: 339 microns (62 increase).
+1-3/4hour:413 microns (76 increase).
So in 3-3/4 hours 269 micron increase.
Is this amount of creep normal? Should this creep have stopped at some point?
Also, I was thinking of leaving the vacuum pump on overnight but it's getting cold at night (34F low). What is too cold for leaving a pump on?
Thanks and have a great day!