REMKO HTS 90 ALU - Manual (Page 52)

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Fig. 33: Deburring the refrigerant piping
1: Refrigerant piping
2: Deburrer
Connection to the unit
n Take off the factory-fitted protective caps.
n The connection of the refrigerant pipes to the
device connections are to initially be made by
hand, in order to ensure a good fit. Then the
connection is brazed.
n The installed refrigerant pipes must be pro-
vided with suitable insulation.
n Special measures need not be taken for the
return of the compressor oil.
NOTICE!
Use only tools which are approved for use in
an HVAC environment. (z. B.: bending pliers,
pipe/tubing cutters, de-burrers and flaring
tools). Do not cut refrigerant pipes with a saw.
NOTICE!
All work must be carried out in a way that pre-
vents dirt, particles, water etc. from entering,
refrigerant lines!
NOTICE!
Soldering is only permitted in an inert gas
atmosphere!
9.2 Commissioning the refrigera-
tion system
Leak testing
Once all the connections have been made, the
pressure gauge station is attached to the Schrader
valve as follows (if fitted):
blue = large valve = suction pressure
Once the connection has been made successfully,
the leak test is carried out with dry nitrogen. Leak
testing involves spraying a leak detection spray
onto the connections. If bubbles are visible, the
connections have not been made properly. Then
produce a soldered connection.
Pumping down to vacuum
After completing a successful leak test, the excess
pressure in the refrigerant piping is removed and a
vacuum pump with an absolute final partial pres-
sure of min. 10 mbar is used to remove all of the
air and empty the pipes. Any moisture present in
the pipes will also be removed.
The connections can be found on the indoor
module above the shut-off valves.
NOTICE!
A vacuum of at least 10 mbar must be pro-
duced!
The time required to generate the vacuum is
dependent on the final pressure pipe volume of the
indoor units 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 pres-
sure gauge station are closed and the valves on
the outdoor unit are opened as described in the
"Commissioning" section.
REMKO HTS
52