Bosch Condens 7000 FP - Gas Tightness Test

Inspection and maintenance
Condens 7000 FP – 6721846699 (2022/12)
38
11.4.2 Carrying out gas tightness test
 Close device shut-off valve.
 Undo locking screw on test nipple by turning it through 2 revolutions.
 Push the test hose of the U-tube pressure gauge onto the test nipple.
 Open the fuel shut-off valve and wait for the pressure to stabilise.
 Note and record the pressure.
 Close the device shut-off valve and check the pressure again a minute
later.
 Calculate the pressure drop per minute from the differential.
By means of the determined pressure drop per minute and the test
volume (V
test
), check in the following diagram ( Fig. 45, page 38)
whether the gas train is still usable.
Fig. 44 Checking internally for tightness
[1] Test nipple
Fig. 45 Permissible pressure drop per minute for the internal tightness test with gas pressure present
[1] “Valve tight” range = applies to new installations
[2] “Valve sufficiently tight” range = valve can be used without
restrictions
[3] “Valve leaks” range = valve may not be used
(perform a test as described in the following)
x Test volume in litres
y Pressure drop in mbar within one minute
Read-off example: test volume (V
test
) 5 litres and pressure drop
4 mbar/min = range 3 (valve leaking = valve may not be used)
carry out test as described below.
If you detect a steep pressure drop of > 10 mbar/minute at a test volume
of (V
test
) of < 1 litre, increase the test volume (V
test
). For the following
include the pipework up to the next shut-off valve in the tightness test
and repeat the test using the new test volume (V
test
).
If the read-off point for the test volume (V
test
) and pressure drop per
minute lies within the "Valve leaks" range (see Read-off example), you
must carry out the test described below.
NOTICE
Risk of material damage due to a short circuit!
 Never spray or let leak detection agent drip onto cable entries, plugs
or electrical cables/leads.
 Cover areas at risk before testing for leaks.
 Check all joints in the tested pipework section using a foaming leak
detection agent.
 If required, seal any leaks and repeat the test.
 If no leak is detected, replace the air/gas ratio control valve.
Complete the tightness test
 Remove the hose.
 After completing the measurements, retighten the locking screw of
the test nipple.
 Check tightness of the test nipples.
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