©Termo-tehnika, d.o.o.
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ID.: 17-16-24-3006-03 | 12.2016
4.3.6 Vacuuming of the system
CAUTION
The pipe connections must be prepared according to instructions (chapter 4.2.6 ) to avoid
the presence of moisture/water and impurities in the system.
Vacuuming is performed in the following steps:
STEP 1:
Connect the end of the filling pipe which was used for filling nitrogen to the vacuum pump. Begin
vacuuming on the service connection pipes (gas and liquid) and pipe connections to the internal device
until the end absolute pressure of 0.3 mbar (a)
. Vacuum the gas and liquid side at the same time.
The time needed for vacuuming the system depends on the length of the device and power of the
vacuum pump.
STEP 2:
When the required vacuum in the system is reached, close the connections to the service manometer
and turn off the vacuum pump and check:
a) If the absolute pressure after 10 min is raised and stays at 230 microns (0.3 mbar) and 1000
microns (1.3 mbar), the vacuuming is completed.
b) If the absolute pressure after 10 min is raised and stays at 1000 microns (1.3 mbar) and 5000
microns (6.7 mbar), the system contains moisture and the vacuuming of the system needs to
be repeated.
c) If the absolute pressure is (quickly) raised above 5000 microns (6.7 mbar), the system is
leaking.
4.3.7 The release of the refrigerant from the external device into the finished system
STEP 1:
Use hex key No. 4 to completely open the valve on the liquid side and hex key No. 5 on the gas side of
the external device (counter-clockwise).
STEP 2:
If needed, add refrigerant to the device in accordance with the table in chapter 4.3.1.
STEP 3:
Carefully remove the filling pipe with service manometer to prevent refrigerant leakage.
STEP 4:
Attach the screw nut and cover on the suction side back to the service valve/connection. This part of
the process must be performed carefully and exactly to prevent potential leakage of the system. Make
sure the cover has the gasket.
STEP 5:
Set the covers on the service valves/connections on the gas and liquid side and attach them.
