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Figure 4: domestic hot water expansion tank
10. CLEANING THE HEATER COIL
To carry out this operation, proceed as described here:
• Drain the heater as described in §8 (draining the heater);
• Remove the front flange by unscrewing the six screws;
• Clean the turns of the coil with a brush and remove the remains with a vacuum cleaner;
• Check that the magnesium anode in the heater flange is sound and renew it if necessary.
Removing the heater
In addition, if necessary, it is possible to remove the entire heater.
To carry out this operation, proceed as described here:
• Drain the boiler circuit as described in the boiler manual;
• Drain the heater as described in §8 (draining the heater);
• Remove the metal crosspiece (screw fastening);
• Unscrew the plumbing connections on the top of the heater;
• Cut the strap and remove the front shell of the insulation;
• Take out the heater, tilting it towards the front.
11. FILLING THE SYSTEM
Important: Regularly check that the pressure gauge (19) reads a pressure of 1 - 1.5 bar when the system is cold. Open the
boiler drain cock to reduce pressure if it is too high. Open the boiler filling cock to increase pressure if it too low (read the
instruction described in the boiler manual).
The cocks can be reached by removing the lower front panel (retained by magnets).
Always open the cock very slowly to allow any air to bleed off.
If the pressure in the system drops frequently, contact an authorised service centre to have the system checked.
7804282.02 - en
SUPPLEMENTARY INSTRUCTIONS
25
FOR THE INSTALLER
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