User`s manual

INSTALLERUSERTECHNICIAN
2525
3.11 Yearly appliance control and
service.
The following checks and maintenance should be
performed at least once a year.
- Clean the flue side of the heat exchanger.
- Clean the main burner.
- Make a visual inspection of the flue extraction hood
for wear or corrosion.
- Check correct lighting and operation.
- Ensure correct settings of the burner in domestic
water and heating phases.
- Check correct operation of control and adjustment
devices and in particular:
- intervention of electrical main switch on boiler;
- system control thermostat intervention;
- domestic water control thermostat intervention.
- Check tightness of gas supply circuit; insert a “U”
or digital type pressure gauge in the pressure point
upstream of the gas valve and then closing the
boiler on-off valve and closing the gas valve, after
5 minutes there must be no pressure variation on
the manometer;
- Check intervention of the device against no gas
ionization flame control; intervention time must be
less than ten seconds;
- Visually check for water leaks or oxidation from/on
connections.
- Visually check that the water safety drain valve is
not blocked.
- Make sure that expansion tank charge, after
discharging system pressure and bringing it to the
zero (read on boiler pressure gauge), is 0.8 bar.
- Check that the system static pressure (with system
cold and after refilling the system by means of the
filler cock) is between 1 and 1.2 bar.
- Check visually that the safety and control devices
have not been tampered with and/or shorted, in
particular:
- temperature safety thermostat;
- air pressure switch.
- Check the integrity of boiler Magnesium Anode.
- Check the condition and integrity of the electrical
system and in particular:
- electrical cables must be inside the channels;
- no traces of black marking or burns.