B, with a conven-
tional tool (mm)
B, with an R410A
tool (mm)
Outer diameter,
copper pipe (mm)
0.7~1.30.0~0.5Ø9.52
Ø15.88
(Follow instructions for the tool used.)
Pressure test and leak test
Both HM 8-12 SPLIT and L8 SPLIT/L12 SPLIT are pressure
tested and leak tested at the factory, but the pipe connec-
tions between the products must be checked after install-
ation.
NOTE
The pipe connection between the products must be
pressure tested and leak tested according to the ap-
plicable regulations after installation.
Under no circumstances must a type of medium other
than nitrogen be used when pressurising or flushing
the system.
Vacuum pump
Use a vacuum pump to evacuate all air. Apply suction for
at least one hour and end pressure after evacuation must
be 1 mbar (100 Pa, 0.75 Torr or 750 micron) absolute
pressure.
If the system has remaining moisture or a leak, the vacuum
pressure will rise after completed evacuation.
TIP
For a better end result and to quicken the evacuation,
the following points must be followed.
■
The connection lines must be as large and short as
possible.
■
Evacuate the system down to 4 mbar and fill the
system with dry nitrogen to atmospheric pressure
to the finish the evacuation.
Filling refrigerant
NOTE
For installations with refrigerant pipes up to 15 m in
length, no extra refrigerant in addition to the
provided amount needs to be added.
When carrying out pipe connections, pressure tests, leak
tests and vacuuming, the service valves (QM35, QM36)
can be opened, to fill the pipes and HM 8-12 SPLIT with
refrigerant.
27SPLIT
For the Installer
Pipe installation
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