REMKO MD 261 - Manual (Page 21)

Supplementary information
for Installation
■
For the combination of the
outdoor component with some
indoor units, the connection of
the refrigerant pipes may differ.
In that case, install the provided
reducer or expansion fittings to
the indoor unit.
■
If the basic length of the
refrigerant pipe exceeds
5 m, add refrigerant when
commissioning the system for
the first time. (See chapter
"Add refrigerant").
12. Ensure that structure-borne
sound is not transferred to parts
of the building. Use vibration
dampers to reduce the effects
of structure-borne sound!
13. Prepare the refrigerant pipe
for the outdoor component as
described above.
A vacuum of min. 20 mbar
must be created!
CAUTION
The time required to generate
the vacuum is dependent on the
pipework volume
of the indoor unit and the length
of the refrigerant pipes. This
always takes at least 60 minutes.
Once any foreign gases and
humidity have been completely
extracted from the system, the
valves on the pressure gauge
station are closed and the valves
on the outdoor component are
opened as described in the chapter
on "Commissioning".
Tightness check
Once all the connections have
been established, the pressure
gauge station is attached as
follows to the Schrader valve (if
fitted):
red = small valve
= injection pressure
blue = large valve
= suction pressure
Once connected, perform a
tightness test using dried nitrogen.
The tightness test involves
spraying a leak detection spray
onto the connections. If bubbles
are visible, the connections have
not been properly made. Re-
tighten the connection or prepare
a new flange.
If the tightness test is successfully
completed, depressurise the
refrigerant pipes and start a
vacuum pump with an absolute
final partial pressure of min. 10
mbar to remove the air in the pipe.
Any humidity present in the pipes
is also removed.
21