113
ENG
Maintenance
g0300122EN rel. 1.0 - 01.12.2021
To remove the heat exchanger, proceed as follows:
• disconnect the cables from the burner electrodes (the detection electrode must be disconnected from the burner control
board, see the A - Fig. 17.b);
• remove the fan manifold by removing the screws B (Fig. 17.b) and remove the burner combustion head (Fig. 17.c);
B
A
300090_054_R02
Fig. 17.b
Fig. 17.c
G
F
A
C
D
I
H
E
B
Fig. 17.d
• disconnect the cables from the foam detection electrode (A - Fig. 17.d);
• unscrew and remove the locking nuts (B - Fig. 17.d);
• remove the boiler cover (C - Fig.17.d);
• remove the nuts (D - Fig. 17.d) from the side of the burner;
• take out the heat exchanger (E - Fig. 17.d) and wash it using a 20% acetic acid solution, removing scale using implements that
do not scratch the lining (e.g. wood or plastic). At the end of the process, rinse thoroughly.
• disconnect the power supply cable and all the pipes/hoses connected to the electric pump and the cover (Fig. 17.d);
• undo the panel fastening nuts and remove it, making sure not to damage the gasket (G - Fig. 17.d);
• unscrew and remove the screws H (Fig. 17.d) to release the steel fi lter (I - Fig. 17.d) and wash it in a 20% acetic acid solution;
• using a wooden or plastic scraper, scrape the inside of the vaporiser chamber.