Instruction manual
46
Inspections and maintenance
Inspections and maintenance performed pro-
fessionally and according to a regular sche-
dule as well as the use of original spare par-
ts are of the utmost importance for fault-free
operation of the boiler and to guarantee its
long life.
Yearly maintenance of the appliance is man-
datory in compliance with Laws in force.
Failure to perform Inspections and Mainte-
nance can entail material and personal da-
mage.
We therefore recommend stipulating an inspection or mainte-
nance contract.
Inspections help to determine the actual status of the applian-
ce and to compare it with the nominal status. This is done
through measuring, controls and observation.
Maintenance is required to eliminate any differences betwe-
en the actual status and the nominal status. This is normally
done by cleaning, setting and replacing individual compo-
nents subject to wear.
Maintenance intervals and their extent are determined by a
specialist based on the status of the appliance ascertained
through inspection.
Inspection and maintenance instructions
To assure long-term functioning of your ap-
pliance and to avoid altering its approved sta-
tus, 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.
• Close any shut-off valves on the heating flow and return
pipes.
After having completed all maintenance work, always per-
form 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.
• Reconnect the appliance to the electric mains and enga-
ge the switch.
• Make sure the appliance is gas tight and watertight.
• Vent the heating system and restore pressure if neces-
sary.
Should you decide to temporarily deactivate the boiler, you
must:
a) shut off the various supplies: electric, water and fuel;
b) empty the water system if antifreeze is not used.
4
INSPECTIONS AND
MAINTENANCE