7.
A good upward bend must have the following
properties:
■
a smooth and even inner surface
■
a uniform and even outer edge
■
a conical upward bend of uniform length.
Lubricate the contact surfaces with compressor oil
before connecting the pipes.
8.
Tighten the connections using a wrench and torque
wrench according to the tightening torque values
in the table.
Tightening torquePipe diameter
Approx. 15 – 20 Nm6.35 mm (1/4")
Approx. 30 – 40 Nm9.52 mm (3/8")
Approx. 50 – 55 Nm12.7 mm (1/2")
Approx. 60 – 65 Nm15.88 mm (5/8")
9.
Insulate the pipes thoroughly and keep the pipe
connections free for leak testing.
Before vacuuming, leak trace the system. Fill with
nitrogen to approx. 3 bar. Leak trace all connec-
tions using leak spray (soapy water) to ensure that
the system is sealed.
10.
For vacuuming of the indoor unit and refrigerant
pipe, connect the vacuum pump to the outdoor
unit as illustrated.
NOTE
Remaining air or damp affects the heat
pump's function negatively and can dam-
age the product.
9Chapter 5 | InstallationAG-AA10
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