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Flanging tool
13
Flanging the refrigerant line
Refrigerant line
Deburrer
12 Deburring the refrigerant line
14 Correct flange shape
Tighten 1. open-ended wrench
Counter
2. open-ended wrench
15 Tighten fittings
Tightening
torque:
14
12-16 Nm
38
28-32 Nm
12
40-44 Nm
58
64-68 Nm
Leakage test
When all connections are made,
the pressure gauge station is
connected to the corresponding
Schrader valve connections, if
present:
red = small valve
= Injection pressure
blue = large valve
= Suction pressure
After completed connection, the
leakage test is carried out with dry
nitrogen.
A vacuum of min. 0.05 mbar
must be created!
NOTE
The duration of the vacuum
creation depends on the pipe line
volume of the interior unit and
the length of the refrigerant lines,
however, the procedure takes at
least 60 minutes.
When foreign gases and moisture
have been completely removed
from the system, the valves on the
pressure gauge station are closed
and the valves of the exterior unit
as opened, as described in chapter
„Start up".
Before the leakage test, the
pipe connections must be
checked.
CAUTION
For the leakage test, the
established connections are
sprayed with leak detection spray.
If air bubbles are visible, then the
connection has not been made
properly. Retighten the fitting or, if
necessary, make a new flange.
After successful leakage test, the
excess pressure in the refrigerant
lines is removed and a vacuum
pump with the absolute final
partial pressure of min. 0,01 mbar
is used to remove all the air and
empty the lines. In addition, any
existing moisture is also removed
from the lines.
23
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