Riello RL 70 Installation, Use And Maintenance Instructions page 59

Photoresistor (Fig. 29)
Clean the glass cover from any dust that may have accumulated.
Photoresistor 1) is held in position by a pressure fit and can there-
fore be removed by pulling it outward forcefully.
D708
Flame inspection window (Fig. 30)
Clean the glass whenever necessary.
Flexible hoses
Check to make sure that the flexible hoses are still in good con-
dition and that they are not crushed or otherwise deformed.
Fuel tank
Approximately every 5 years, or whenever necessary, suck any
water or other impurities present on the bottom of the tank using
a separate pump.
Boiler
Clean the boiler as indicated in its accompanying instructions in
order to maintain all the original combustion characteristics in-
tact, especially the flue gas temperature and combustion cham-
ber pressure.
Maintenance
Fig. 29
D709
Fig. 30
27
GB
Fuel pump and/or couplings replacement (Fig. 31)
In conformity with figures (Fig. 31)
D1108
Fig. 31
2916076