Quick Connect Fittings
NOTE: When hard piping is used, complete all piping and evacuate lines before connecting quick
connects.
Be especially careful when connecting the quick connect fittings. Read through the following steps before
making the connections.
1. Remove protector caps and plugs.
2. Carefully wipe coupling seats and threaded surfaces with a clean cloth.
3. Lubricate the male diaphragm and synthetic rubber seal with refrigerant oil.
4. Thread the coupling halves together by hand to insure that the threads mate properly.
5. Tighten the coupling body hex nut and union nut with the proper size wrench until the
coupling bodies “bottom out” or until a definite resistance is felt.
6. Using a marker or pen, make a line lengthwise from the coupling union nut to the bulkhead.
7. Tighten the nuts an additional quarter-turn; the misalignment of the lines shows how much
the coupling has been tightened. This final quarter-turn is necessary to insure that the joint
will not leak. Refer to Table 7.11 below for torque requirements.
Size O.D. Cu Coupling Size Torque lb-ft
1/2” #10 35-45
1-1/8” #12 50-65
Table 7.11 Refrigerant quick connect
sizes and torque
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 34
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