30
Close the boiler again in reverse order to Fig. 2 on
page 11.
Checking the gaskets on the flue gas side
B
C
A
Fig. 21
1.
Check the joints between flue gas collector
A
and
boiler back panel for tightness.
Note
Check the gaskets at full load operation, for exam-
ple using an inspection mirror, gas sensor or ther-
mal image camera. If required, remove the thermal
insulation components. Traces of condensate on
the outside of flue gas collector
A
also indicate a
leak.
2.
Check the flue gas temperature sensor and plug-in
connection
B
for correct seating.
3.
Check gasket
C
with the boiler flue connection for
tightness. If necessary, replace the gasket.
Performing final checks
Record the actual values in the report on page 62.
Checking the water quality
Enter the amount of top-up water, the total hardness
and the pH value in the tables on page 61.
For water quality requirements, see page 59.
Checking the safety valve function
Checking the expansion vessel
Note
Observe the manufacturer's instructions for the expan-
sion vessel.
Carry out this test on a cold system.
1.
Drain the system until the pressure gauge indi-
cates "0" or close the cap valve on the expansion
vessel and reduce the pressure in the expansion
vessel.
Commissioning, inspection, maintenance
Closing the boiler casing
5816717
