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Maintenance
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7.5 Cleaning
The boiler may only be cleaned by an authorised technician or by the Hoval
Customer Service.
The Hoval gas heating boiler should be cleaned and maintained once
every year.
If the Hoval gas heating boiler was in operation during the building phase,
it will be necessary to carry out a check for cleanliness. If the boiler is dirty,
clean it.
7.5.1 Cleaning the burner cylinder
The burner cylinder must be cleaned if visible contamination exists (such as
deposits, e.g. builder’s dust)
Adjustable spanner, screw driver, open end spanner SW 8, vacuum cleaner,
compressed air, water.
Preparation:
1. Set the main switch on the boiler control unit to “0”.
2. Close the main gas valve.
3. Remove the sound insulation covers.
4. Disconnect all the burner connector plugs.
5. Pull the corrugated hose (1, fig. 7) off the venturi tube on the burner
(if present).
6. Disconnect the earthing cable (2) from the burner cylinder (fig.8).
7. Disconnect the gas connection from the gas armatures.
8. Unscrew the fan with the gas mixing unit in place (2, fig. 8).
Removal and cleaning:
Caution, burn hazard
9. Safety gloves must be worn when removing the burner cylinder.
10. Lift the burner cylinder out (3, fig. 9).
11. Clean the premix burner with compressed air inside and out,
or rinse thoroughly with water.
12. Remove dust and dirt particles with a vacuum cleaner (see fig. 10).
Reassembly:
13. Replace the gasket on the gas connection
14. Reassemble the burner in reverse order.
15. Check for leaks
16. Carry out a flue gas measuring according to point 6.7.
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Figure 7
Figure 8
Figure 9
Figure 10
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