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17. Annual Maintenance Cont.
•
Close the inlet valve
•
Open the system domestic hot water valves
Follow the instructions for removing the ex-
ternal panels from 17.2. Remove the nine
screws labelled C in fi gure 17.4. Now you
will have complete access to the combustion
chamber. The sloping and multi-gas type
burner (7 on page 11) does not need special
maintenance, but it is suffi cient to dust it with
a bristle paintbrush.
The combustion fan does not require any special maintenance. Lubrication is not necessary
due to the fact that the ball bearings are sealed. Check that the fan operates and that the vis-
ible impeller fi ns are free of any dirt or obstructions.
Have the integrity of the fl ue outlet pipe (24 on page 11) air intake pipe (25 on page 11),
checked periodically, the venturi device (23 on page 11) cleaned and the effi ciency of the fl ue
safety circuit checked at least once a year. For all the above maintenance operations it is ad-
visable to call an approved Service Engineer.
•
Remove the four Phillips head screws from the vent connector on the boiler.
•
Remove the vent connector from the boiler by pulling vertically on it.
•
Remove the fi rst elbow from the horizontal run of the exhaust to the outside.
•
Using a fl ashlight inspect each length of vent pipe for obstructions and dirt buildup. Clean
any that is found with an appropriate sized brush.
•
Inspect the venture device inside the outlet of the combustion fan. Make sure that it is free
of any dirt build up or blockage.
•
Make sure the seals are properly seated in the female ends of the vent pipe with the fi ns
facing the male end of the pipe.
•
Reinstall the elbow onto the horizontal run of the pipe fi rst by simply pushing the parts together.
•
Push the vent adapter down onto the top of the boiler and reinstall the four Phillips head
screws.
RIVA PLUS COMBI MANUAL
17.4
Emptying the Domestic Hot Water circuit
17.5
Cleaning the primary heat exchanger:
17.6
Checking the combustion fan:
17.7
Checking the fl ue:
Figure 17.4
43
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