Tip: Seal Your Service Valve Caps For A Leak Free System

Gary McCreadie | | Categories: Refrigerant , Thread Sealant

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Tip: Seal Your Service Valve Caps For A Leak Free System

By Gary McCreadie

It wasn't too long ago I performed a leak check on a couple of large chillers.  I used my Testo 316-3 electronic leak detector for the inspection.  I found no significant leaks, but what I did find was interesting, with all service caps in place, many Schrader core valves registered a positive reading, they were leaking.  All the cores and caps were replaced.  I was back at the site a couple of weeks later and found that many of those new Schrader cores were setting off my 316-3 even with the caps in place, they were the round brass caps with rubber o - ring insert.  I applied Nylog Blue to a few of these fittings, hand tightened the caps and the leaks disappeared.  Now, I apply Nylog to all service caps before re-installing.  TX valve caps, hot gas bypass, solenoids, valve stems, ORI valve caps, etc. 

Check out the video for a demo...

Check out the link to my YouTube channel for more tips, tricks, and troubleshooting videos and check out the The HVAC Know It All podcast here or on your favourite podcast app.  Happy HVACing...

Gary McCreadie

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