Viessmann Vitocrossal CRU Series Installation Instructions Manual page 37

Connections on the flue gas side
A
D
Fig. 31
Hose clip
A
Sealable test port
B
Boiler flue connection
C
Collar
D
(cont.)
B
C
1. Fit the boiler flue connection as shown in the dia-
gram.
2. Route the flue pipe with the shortest possible run,
maintaining a slight rise to the chimney.
Avoid sharp kinks.
Flue system installation instructions
Danger
Leaking or blocked flue systems, or an inade-
quate supply of combustion air can cause life
threatening poisoning from carbon monoxide in
the flue gas.
Ensure the flue system is in good working order.
Vents for supplying combustion air must be non-
sealable.
37