8d • 🚨 Help, I'm Stuck! 🚨
Evacuation problem
Hello, I am hoping someone can help with a problem I am having evacuating a new ACIQ heat pump. I have performed a Nitrogen pressure test at 290 psi with zero psi drop after 30 minutes. No leaks found. However for the vacuum test I can only pull down to approx 700 microns and when I isolate the system it raises to approx 1700 and holds there. Using CPS micron gauge with Schrader core removed on low side. I have tested my entire vacuum system by placing a shut off valve on the end of the core removal tool that connects to the ac port and can easily pull down to 300 microns and hold there when I isolate from the vacuum pump. I am at wits end trying to figure why I cannot pull down below 500 microns and stay close to that value once isolated from the pump. Not comfortable releasing the Freon with this high micron level. Any suggestions? Thank you.
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Evacuation problem
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