Essential recommendations for safety
•
If the system is fitted with an external hot water tank, isolate the DHW circuit
before draining the heating (primary) circuit.
•
Water flowing out of the drain valve may be extremely hot and could cause
severe scalding. Keep people away from the hot water discharge.
Set-up conditions
•
Boiler switched off using the ON/OFF master switch
•
DHW circuit (if any) isolated
•
External power supply isolated
•
Gas supply closed
Heating circuit draining procedure
1.
Close the isolating valves (
1
).
2. Connect the drain valve (
2
) to the sewer with a hose.
3. Open the drain valve (
2
) to empty the heating circuit of the boiler.
4. If possible, open the circuit air vent (
3
) to accelerate the draining process.
5. Close the drain valve (
2
) and the air vent (
3
) once the heating circuit of the boiler is empty.
DRAINING THE HEATING CIRCUIT OF THE BOILER
Cold water
Hot water
PRESTIGE
1
1
3
2
3
2
1
Min. 3 mm
Max. 4 mm
PRESTIGE 42-50-75-100-120 Solo : A1007856 - 664Y6200 • G
EN
FR
NL
ES
IT
DE
PL
RU
en
41
MAINTENANCE
REMOVAL, CHECK AND INSTALLATION OF THE BURNER ELECTRODE
Set-up conditions
• Boiler shut down
• External power supply isolated
• Gas supply closed
• Front and top panels open, as required, refer to “Removal and Installation of the Front and Top
Panels” on page 32.
Removal procedure
1. Disconnect the electrode grounding plug from the electrode.
2. Disconnect the electrode ignition cable from the electrical box.
3. Remove two mounting screws (
1
) and retain them for reinstallation.
4. Remove the electrode (
2
).
5. Check the correct alignment of the electrode ends and that the gap corresponds to the values
indicated in the illustration below.
Installation procedure
1. Install a new gasket (
3
).
2. Install the electrode (
2
) using the two screws (
1
), torque i.a.w. “Torque Values” on page 44.
3. Reconnect the grounding cable
to the electrode.
4. Reconnect the ignition cable to
the electrical box.
Follow-on tasks
None
Essential recommendations for the correct operation of the appliance
•
It is recommended to remove the electrode from the burner hood before removing
the burner from the boiler.
•
Remove the electrode to control it in case of ignition problems.
