Checking Gas Connections For Tightness; Checking The Gaskets On The Flue Gas Side - Viessmann Vitocrossal 200 Series Service Instructions Manual

Commissioning, inspection, maintenance

Checking gas connections for tightness

Danger
Escaping gas leads to a risk of explosion.
Always carry out the following steps:
!
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into contact
with electrical contacts.
1. Insert new gaskets in all gas fittings that have been
opened and retighten them.

Checking the gaskets on the flue gas side

D
10 Nm
A
B
Fig. 32
1. Check flue gas collector seals
Note
Check the gaskets at full load operation, for exam-
ple using an inspection mirror, dew point indicator
or thermal image camera. If required, remove the
thermal insulation sections. Traces of condensate
on the outside of flue gas collector
a leak.
2. Check lip seal B of the boiler flue connection for
tightness.
3. If required, retighten the flue gas collector at ten-
sioning toggles ; tighten screws diagonally with
C
10 Nm. Replace lip seal
32
C
3
for tightness.
A
also indicate
A
B if it leaks.
2. Open the gas shut-off valve.
3. Check the inlet joints of the gas train for tightness.
4. Start the burner (see page 9).
5. Check for tightness:
Outlet joints of the gas train
■
■ Joint between the fan and the boiler door
■ Joint between the fan and the Venturi pipe
4. Check flue gas temperature sensor and plug-in
connection for correct seating.
D
!
Please note
Flue gas leaks can pose a risk to health. Do
not over-tighten the flue gas temperature
sensor when screwing it in.
Only screw in the sensor until finger-tight
(5 Nm), as far as it will go. Check for leaks.