Buderus Logano plus GB312 Installation And Maintenance Instructions Manual page 47

Fig. 51 Permissible pressure drop per minute during the internal tightness test with prevailing gas supply pressure
x Test volume in litres
y Test volume in mbar within one minute
1 Range "Valve tight" = applies to new installations
2 Range "Valve adequately tight" = valve can be used
without restrictions
3 Range "Valve leaks" = valve may not be used
>> check as described in the following
Read-off example: test volume (V
pressure drop 4 mbar/min = range 3 "Valve leaks" = valve
may not be used >> check as described in the following
If you detect a steep pressure drop of
> 10 mbar/minute at a test volume of (V
of < 1, increase the test volume (V
For this, include the pipework to the next
shut-off valve in the tightness test and repeat
the test using the new test volume (V
If the read-off point for test volume (V
drop per minute lies within the range "Valve leaks" (see
read-off example), carry out the test described below.
NOTICE: System damage!
B Never spray or let leak detection agent
drip onto cable entries, plugs or electrical
cables/leads.
B Cover areas at risk before testing for
leaks.
B Check all sealed points in the tested pipework section
using a foaming leak detection agent.
B If required, seal any leaks and repeat the test.
B If no leaks are found, replace gas train.
Completing the leak test
B Remove hose.
B After completing the test, fully tighten the screw inside
the pressure test nipple.
B Check the pressure test nipple for tightness.
Logano plus GB312 - Subject to technical modifications.
) 5 litres and
test
)
test
).
test
).
test
) and pressure
test
Inspection and maintenance
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