Checking The Gaskets On The Flue Gas Side; Checking The Mixer For Ease Of Operation And Leaks; Checking The Thermal Insulation For Firm Seating; Checking The Flue System For Leaks - Viessmann Vitocrossal 300 Service Instructions For Contractors

Checking the gaskets on the flue gas side

C
Fig. 9
Clamping clips
A
Actuator damper
B
Flue gas temperature sensor
C

Checking the mixer for ease of operation and leaks

1. Remove the motorised lever from the mixer han-
dle.
2. Check the mixer for ease of operation.

Checking the thermal insulation for firm seating

Checking the flue system for leaks

Checking the ventilation air apertures in the installation room (open flue
operation)

Instructing the system user

The system installer should hand the operating instruc-
tions to the system user and instruct the user in oper-
ating the system.
A
B
Commissioning, inspection, maintenance
1. Check the flue gas collector seals for tightness.
Danger
Escaping flue gas poses a risk to health.
Check gaskets on the flue gas collector and
adjust if required.
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 the flue gas collector also indicate
a leak.
2. If required, retighten the flue gas collector at the
clamping clips. Tighten screws diagonally to 7 Nm.
Replace the lip seal in the case of leaks.
3. Check the flue gas temperature sensor and plug-in
connection for correct seating.
Note
Repeat the tightness test after approx. 500 hours run;
retighten the screws if necessary. Ensure that the gas-
ket and clamping clip are seated correctly.
3. Check the mixer for tightness. In the event of a
leak, replace the O-ring.
4. Snap the motorised lever into place.
This includes all components installed as accessories,
e.g. remote control units. In addition, the system instal-
ler must make the user aware of the required mainte-
nance work.
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