Quote:
Originally Posted by 1990C4S
How were they able to vacuum the system down if there was a leak? On 9/26 they apparently pulled to 450 microns. |
That is an excellent question.
The original vacuum test only tests the line sets and inside units, not the outside unit because the isolation valves are closed. So maybe that's why they were thinking there might be a leak inside the outdoor unit. The current nitrogen pressure tests don't seem to indicate leaks currently.
I watched them pull it down and "hold" it. Yes, pulled to 450 microns. The vacuum hold test was not perfect rising about 1-2 microns/minute. Maybe the pump was able to pull faster than the leak and get to 450. ??