January 2015 Page 13
Pre-Charged Tubing Coupling Connections
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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