Rinnai E75CN - Manual (Page 58)

Installation & Servicing Instructions Rinnai E-Series
58
13.2 Maintenance activities
The fan unit and burner cassette (figure 27 to 29) (2 and 4 year maintenace)
- remove the electrical connection plug from the gas valve (1) and fan motor (2);
- loosen the nut (3) of the gas pipe under the gas valve;
-
replace the gasket with a new one;
- loosen the front cross head screw (4) of the black plastic silencer;
- after this turn the two clamping rods (9 and 10) ¼ turn and remove them by pulling
them forward.
Note the correct turning direction (red indicator. fig. 29);
- 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.
Heat exchanger (2 and 4 year maintenance)
- 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
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.
If the boiler should activated with clamping rods in the wrong position it will
cause serious property damage, personal injury or loss of life.
Ignition electrode (4 year or 4000 hour maintenance)
The replacement of the electrode is only necessary when the electrode is worn off.
This can be checked by measuring the ionisation current. The minimum ionisation
current has to be higher than 4µA on full load.
If the inspection glass is damaged the complete electrode must be replaced.
Replace the ignition assembly after 4 years or 4000 hours, whichever occurs first.
Replacement goes as follows:
- remove the electrical connections of the electrode;
- press the clips on both sides of the electrode to both sides and remove the complete
electrode;
- remove and replace the gasket;
Refitting of the components is done in reverse order.
fan unit and gas valve
figure 27
NOTICE
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NOTICE
i
NOTICE
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!
DANGER
figure 28
Clamping rods figure 29
10
1
2
3
9
4