Make Sure to Connect You Gauge Quickly To Prevent Contamination!
- Craig Migliacco
- Jul 15, 2025
- 1 min read
If you remove the vapor access port cap on a running air conditioning system, the low temperature brass on the inside of the port will condense water vapor from the air surrounding the port directly onto the port. This is because the air surrounding the port is often below the dew point.
Don't remove the port cap until you are immediately ready to connect the gauge. Don't even connect the gauge unless you suspect a problem with the refrigerant charge level. We want to reduce the chances of contaminating the system with air and/or water. Remember that water mixed with POE oil creates alcohol and acid. This leads to other problems such as copper plating in the compressor and a breakdown of the resin insulation on the compressor electrical windings. Always remember to protect the system, from the vacuum procedure to the charging and disconnection procedures!
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Reminding people not to remove the gate cover too early or to limit meter connections to avoid contaminating the system with air and water is a top-notch maintenance procedure that helps machinery operate stably and accurately, just like when you're concentrating on pressing the right notes up, down, left, and right in Friday Night Funkin after a hard day's work to relieve stress.
A very clear and well-structured guide. The breakdown of tools and methods makes a technical topic much easier to understand. Mid-article, it reminded me of a general home-service discussion I read on https://lovelri.com/ that valued practical know-how like this. Helpful content overall.
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