Viessmann VITOFLEX 300-UF Operating Instructions Manual page 44

Maintenance
Inspection and maintenance
Servicing the recirculation system (optional)
Maintenance intervals
Fig. 7
Activity
Clean recirculation fan
Clean recirculation gas line
Note
Check the flue pipe and the maintenance cover for tightness after each cleaning.
■
No gas must escape when the recirculation flue gas fan is operating and the dampers are
■
closed.
Check gaskets on the flue pipes and service apertures
After maintenance has been carried out
To reset maintenance, see page 24
Conveyor device maintenance
Warning
Risk of serious or fatal injury through becoming
trapped or crushed by moving parts.
Before starting any maintenance work on the
conveyor devices, switch OFF the heating sys-
tem at the mains isolator. Safeguard the system
against reconnection.
44
(cont.)
A
B
for leaks
B
Warning
Risk of being crushed, cut or entangled by rotat-
ing or moving parts as a result of missing pro-
tective covers
After completing maintenance work on the con-
veyor devices, ensure that all protective covers
are re-installed correctly.
Interval
Every six
months
O
O
O