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14 Maintenance
Maintenance or changes to the boiler may only be carried out by an authorised
technician.
14.1
The frequency of maintenance
We advise that an inspection is carried out every year with an overhaul every three years.
When doing this the circumstances of the boiler's location must be taken into account.
From this one can determine whether to deviate from this advice.
Please contact Rinnai for further guidance on the frequency and service
requirements.
14.2
Maintenance activities
To carry out the maintenance activities please follow the next procedure:
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The air box
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The fan unit and burner cassette
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Heat exchanger
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Refitting of the components is done in reverse order.
Make sure that during refitting the clamping rods they are put in the right
position. They should be turned vertical.
switch off the power supply;
remove the four screws out of the quick release fasteners;
remove the screw behind the door on the front of the casing;
remove the casing towards the front.
the casing is also the airbox
clean the casing with a cloth with a simple (non-abrasive) cleaning agent;
remove the electrical connection plug from the gas valve and fan motor;
loosen the nut of the gas pipe under the gas valve;
replace the gasket with a new one;
loosen the front cross head screw of the black plastic silencer;
after this turn the two clamping rods ¼ turn and remove them by pulling them forward.
Note the right turning direction (red indicator);
slightly lift the fan unit and remove it towards the front of the heat exchanger;
remove the burner cassette out of the fan unit;
check the burner cassette for wear, pollution and possible cracks. Clean the burner
cassette with a soft brush and vacuum cleaner. If burners are cracked replace the
complete burner cassette;
replace the gaskets between burner and fan unit and the gasket between fan unit and
heat exchanger;
check the venturi and the gas-air distribution plate for pollution and clean this part, if
necessary with a soft brush and vacuum cleaner. If the air box contains a lot of dirt
it is plausible that the fan itself is dirty as well. To clean this, the fan has to be removed
from the hood and the venturi. Clean the fan with a soft brush and a vacuum cleaner.
Replace the gasket and ensure that all gaskets of the fan parts are mounted correctly.
check the heat exchanger for contamination. Clean this if necessary with a soft brush
and a vacuum cleaner. Prevent dirt falling down into the heat exchanger.
Flushing the heat exchanger from the top down is not permitted
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