Viessmann VITOLIGNO 250-S Operating Instructions Manual page 44

Maintenance
Maintenance intervals
Interval Activity
Before every heat-up
Check the ash chamber, clean if necessary.
Weekly
Clean the ash chamber.
After 100 hours run
Clean the tubular heat exchanger.
Check the fill level of the tubular heat exchanger ash pan,
empty the container if required.
After 300 hours run
Clean the sight glass.
Check the combustion chamber for deposits, clean if neces-
sary.
After 900 hours run, and at least once a year
Clean and calibrate the Lambda probe.
Clean the flue gas fan.
Check all gaskets for damage; replace if required.
Check the thermally activated safety valve for tightness.
Twice yearly
Thoroughly clean the boiler.
Every 5 years
Replace the battery inside the control unit.
Tasks for heating contractors
See installation and service instructions
Cleaning the ash chamber
C
B
A
Fig. 34
Ash pan
A
Ash chamber
B
Ash chamber door
C
1. Pivot the ash box door up.
44
(cont.)
System user
2. Check the gaskets for wear and damage. Replace
these if required.
Heating con-
tractor
X
X
X
X
X
X
X
X
X
X
X
X