45
Maintenance instructions
Inspection and maintenance instructions
To assure long-term functioning of your appliance
and to avoid altering its approved status, only
original Unical spare parts must be used.
Before proceeding with maintenance, always perform the fol-
lowing operations:
• Disconnect the electric mains switch.
• Isolate the appliance from the electric mains by means of
an isolated device with a contact opening of at least 3 mm
(e.g. safety devices or power switches) and make sure that
it cannot be re-connected accidentally.
• Close the gas shut-off valve upstream the boiler
(where
present)
.
• Close any shut-off valves on the heating flow and return
pipes.
Boiler body maintenance
Danger!
Before performing any maintenance, make
sure the boiler and its components have
cooled down.
Disconnect the boiler from the electric mains
and shut the gas supply
(if any)
to the appliance.
Attention!
Before cleaning the boiler body, protect the
panel board against any water sprays.
Once a year, at the end of the heating season, the boiler must
receive a general cleaning.
Before performing any maintenance, make sure that all the
precautions referred to in the previous point have been taken.
To proceed with maintenance you must:
- disconnect power by acting on the main switch;
- remove the burner, which could be overhauled at the same
time;
- open the furnace door to access the combustion chamber;
- remove the smoke chamber access door;
- brush the smoke ducts energetically to remove any trace of
filth.
Check condition of gaskets and insulation fibres
The insulation fibre of the door can show cracks
after a short time of operation; this however does
not reduce its insulation capacity nor jeopardise
its lifespan. Check the condition of the seal gas-
ket which must not show signs of deterioration;
if so, it must be replaced, using only original
spare parts.
Check the condition of the smoke chamber inspection cover
gasket.
Replace it if worn, using only original spare parts.
Maintenance of burner
Burner maintenance must be carried out by personnel authorised
by its manufacturer (or else the warranty shall be terminated).
Checking ignition electrode
Burner maintenance must be carried out by personnel authorised
by its manufacturer (or else the warranty shall be terminated).
After having completed all maintenance work, always perform
the following operations:
• Open the heating flow and return pipes.
• If necessary, restore the heating system pressure until it
reaches the static pressure relative to the highest point of
the system.
• Open the gas shut-off valve
(where present)
.
• Reconnect the appliance to the electric mains and engage
the switch.
• Check tightness of the appliance on the gas side
(where
present)
and on the water side.
• Vent the heating system and restore pressure if necessary.
Should you decide to temporarily deactivate the boiler, you
must:
a) intercept the supplies: electric, water and fuel;
b) empty the water system if antifreeze is not used.
