Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 67

Further details regarding the individual steps
1. Undo union nuts and remove gas
pipes A and B.
2. Remove gas restrictor for auxiliary
burner C and that of the Stirling
burner D and insert the new gas
restrictor for natural gas LL into the
Stirling burner (see previous table).
3. Insert gas pipes A and B with new
gaskets E and tighten the union
nuts.
Commissioning, inspection, maintenance
(cont.)
E 4x
C
D
4. Check the CO or O
2
burners (see page 79).
Danger
Escaping gas leads to a risk of
explosion.
Check all fittings for gas tight-
ness.
A
B
content for both
2
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