Connection lines
21.10.2015
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Copyright
2014 by: WATERKOTTE GmbH. Subject to changes.
7.3.1
Tube airtight testing method (recommended procedure), test equipment nitrogen
Make sure that stop valves A and B are closed, and do not open them.
Connect the testing tools (stop valve A).
Add pressure to the refrigerant lines through the service port C of the liquid
stop valve A.
Do not increase pressure to the specified value at once, but rather
gradually:
1.
Pressurise to 0.5 MPa (5 bar), wait five minutes, and make sure
that pressure does not drop.
2.
Pressurise to 1.5 MPa (15 bar), wait five minutes, and make sure
that pressure does not drop.
3.
Pressurise to 4,2 MPa (42 bar) (max. working pressure) and meas-
ure ambient temperature and refrigerant pressure.
4.
If specified pressure is maintained for one day and does not drop,
the tubes have passed the test and there are no leaks.
5.
If the ambient temperature changes by 1 °C, the pressure will
change by about 0.01 MPa (0.1 bar). Make the necessary correc-
tions.
6.
If the pressure drops during steps (2) or (3), a gas leak exists. Look
for the source of the gas leak.
A Stop valve, liquid side
B Stop valve, gas side
C Service port
D Open/close section
