Nibe SPLIT HBS 12 Installation And Maintenance Instructions Manual page 30

For the Installer
Pipe installation
Pressure test and leak test
Both HBS 12 and AMS 10 are pressure tested and leak
tested at the factory, but the pipe connections between
the products must be checked after installation.
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. Vacuum for at least
one hour and end pressure after evacuation must be 1
mbar (100 Pa, 0.75 dry or 750 micron) absolute pressure.
If the system has remaining moisture or a leak, the vacuum
pressure will rise after completed evacuation.
Mätuttag
Serviceventil, vätska
Serviceventil, gas
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
Evacuate the system down to 4 mbar and fill the
system with dry nitrogen to atmospheric pressure
to the finish the evacuation.
Filling refrigerant
AMS 10-8/AMS 10-12 is delivered complete with the refri-
gerant required for the installation of refrigerant pipes up
to15m in length.
NOTE
For installations with refrigerant pipes up to 15 m in
length no extra refrigerant in addition to the supplied
amount needs to be topped up.
When carrying out pipe connections, pressure tests, leak
tests and vacuuming, the service valves (QM35, QM36)
can be opened, to fill the pipes and HBS 12 with refriger-
ant.
26
Manometer
Vacuum
pump
possible.
Insulating refrigerant pipes
Insulate refrigerant pipes (both gas and liquid pipes) for
heat insulation and to prevent condensation.
Use insulation that can withstand at least 120 °C. Poorly
insulated pipes can cause insulation related problems
and unnecessary cable wear.
Principle:
or connecting indoor
tdoor units
Liquid piping
Connections:
and (accessory)
NIBE™ SPLIT
Exterior t
Gas pipi
Insulation
Pipe cover (accesso