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MAINTENANCE
6.6
Cleaning
The boiler is only allowed to be cleaned by a
licensed specialist or Hoval customer service
technician.
The Hoval gas boiler must be cleaned and serviced at
least once a year.
NOTICE
If the Hoval gas boiler was in operation during
the building phase, it is essential to check the
degree of contamination. Clean in the case of
heavy dirt build-up.
6.6.1 Cleaning the burner cylinder (inside and
out)
The burner cylinder must be cleaned if visible
contamination exists (such as deposits, e.g.
builder's dust)
Ring spanner, screwdriver, vacuum cleaner,
compressed air, water
Preparation:
1. Remove cover plate
2. Fold out step board(s)
WARNING
The heat generator must be de-energised for
maintenance.
Set the blocking switch to “0” and disconnect
the heat generator from the mains (e.g. main
switch).
3. Close main gas valve.
4. Remove absorber hoods.
5. Undo all burner plug-in connections.
6. Unfasten the earth wire (1, Fig. 23) on the burner cy-
linder.
1
Fig. 23
7. Disconnect gas connection from the gas valves. Use
the supplied special open-end spanners (Fig. 24).
!
Fig. 24
8. Unscrew the fan with gas mixing device (2, Fig. 25).
2
Fig. 25
Removing and cleaning:
CAUTION
Danger of burns,
let the boiler cool down or wear protective
clothing.
9.
Wear safety gloves when removing the burner cylin-
der.
10. Remove the burner cylinder upwards (3, Fig. 26).
3
Fig. 26
Summary of Contents for UltraGas 1550
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