
Pre-Charged Tubing Coupling Connections
September 2006 Page 17
Inspect couplings, wipe clean and lubricate
both parts with polyolester refrigerant oil.
Hand tighten to be sure threads are properly
engaged.
Use two wrenches and continue tightening the
couplings. As the diaphragms being to pierce,
the couplings will be harder to turn. Be sure
only the swivel nut is rotated.
Continue tightening until the swivel nut feels
like it is tight, then go to the next step. No
threads will be seen when the couplings are
tight.
After the swivel nut feels like it is tight, mark
the nut and the panel. Then tighten one
quarter turn more. That ensures that there is
a brass-to-brass joint inside the coupling.
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