Coldmachine Installing the cooling unit
23
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➤ Apply refrigerant oil to the internal and external threads and to the internal man-
drels (fig. f, page 8).
➤ Connect the two halves of the coupling and screw them together by hand at first
(fig. g, page 8). Do not use a wrench!
One-way coupling with union nut:
➤ Screw on the coupling half with the union nut using a wrench size 21 mm and a
wrench size 19 mm up to the end of the thread or until a noticeable resistance is
felt. Do not tighten the screw connection yet.
The wrench size 19 mm serves as a guide when screwing on the union nut.
Connection of the one-way coupling with external thread:
➤ Screw on the coupling half with the union nut using a wrench size 21 mm and a
wrench size 16 mm up to the end of the thread or until a noticeable resistance is
felt. Do not tighten the screw connection yet.
The wrench size 16 mm is used for counterholding when screwing on the union
nut.
➤ Use a pencil to draw a line lengthwise from the union nut to the bracket of the
opposite coupling half.
➤ Now tighten the union nut firmly with a torque of 30 Nm or another 1/4 turn. The
offset of the line shows how strongly the one-way coupling was tightened.
This last turn is necessary to ensure a leak-free connection between the coupling
halves.
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➤ Perform a leak test on the coupling connections. This ensures that the one-way
couplings are correctly connected and the sealing is functional.
NOTE
The O-ring is only an interim seal during the initial connection of the one-
way couplings. This O-ring is only used for the initial sealing between the
piercing of the diaphragm and the final metallic sealing. A leak-free seal
is only achieved by a metallic connection between the two coupling
halves.
NOTE
The distance between the beginning of the union nut and the hexagon
of the external thread must not exceed 3 mm (fig. g, page 8).
DometicColdMachine50-54-55-84-85-86-94-95-96-CS-NC15_IOM_4445100001_EMEA16_20xx-xx-xx.book Page 23 Tuesday, May 4, 2021 7:24 PM
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