MAINTENANCE INSTRUCTIONS
53
Cleaning the D.H.W heat exchanger
(see fig. 1)
• Close the shut-off valve and drain the domestic hot
water circuit and central heating circuit of the water
heater;
• Use a 4 mm Allen key to unscrew the four screws
securing the heat exchanger to the multiplex unit;
• Remove the heat exchanger from the left side of the
water heater, note its orientation;
• De-scale the heat exchanger by chemically washing
the plates
• Fit new rubber washer, inserting them in their
housings on the multiplex unit;
• Re-assemble the heat exchanger and components
following the above procedure in reverse order;
• Fill the system with water and check for any leaks
from the joints.
Part replacement
:
Ignition and/or flame ionization electrodes
(see fig. 2)
• Un-Plug the electrode wires;
• Slacken the fixing screws;
• Remove the electrodes. When fitting the new ones,
check that the seals are not damaged. Replace if
necessary;
• Reconnect the wires and re-assemble the
components following the above procedure in
reverse order;
• Switch on the power supply and restart the
appliance;
If the water heater does not restart, check the
positions of the electrodes (especially the ignition
electrode). Make sure that original position and
distances between the electrodes and the burner
are respected to avoid a water heater malfunction).
POSITIONING THE IGNITION ELECTRODE AND THE IONISATION ELECTRODE
+
1
7
.
5
-
-
7
1
+
0.5
-
+
3.5
Fig. 2
ionization
electrode
ignition
electrode
Fig. 1
D.H.W. heat
exchanger
fixing
screws
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