Closing The Boiler Casing; Checking The Gaskets On The Flue Gas Side; Performing Final Checks; Checking The Water Quality - Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual

Commissioning, inspection, maintenance

Closing the boiler casing

Close the boiler again in reverse order to Fig. 2 on
page 11.

Checking the gaskets on the flue gas side

Fig. 21

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.
30
1. Check the joints between flue gas collector
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
B
insulation components. Traces of condensate on
the outside of flue gas collector
leak.
C
2. Check the flue gas temperature sensor and plug-in
connection
3. Check gasket
A
tightness. If necessary, replace the gasket.
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.
also indicate a
A
for correct seating.
B
C with the boiler flue connection for
and
A