61
Tec
hnical f
eatures and dimensions
ENGLISH
INSPECTIONS AND
MAINTENANCE
3.29 - ADJUSTING THE BURNER
The following instructions are intended
exclusively for
service personnel authorised
by the manufacturer of the burner.
Burner calibration and preliminary operations are provided in
the burner’s instruction booklet.
Gas-fired burners are equipped with a gas valve with which the
flow rate can be determined: upon commissioning,
the actual
thermal flow rate must always be controlled by means of the
counter on the main piping, making sure it is not below the
minimum value on the data plate of the boiler.
With a good adjustment of the burner you will get the following
average values, measured by the fireplace with a special
analyzer:
1) for diesel fuel with visc. max 1.5 ° E at 20 ° C:
- CO
12 to 13%
- Frequency Index Bacharach <1
- Smoke temperature 190 ÷ 210 ° C
2) for natural gas network:
- CO
9 ÷ 10%
- Smoke temperature
180 ÷ 200 ° C
(Values for clean boiler with water at ~ 70 ° C).
It is good practice to adjust the fuel flow rate to the actual re
-
quirement of the plant, without exceeding, on the one hand, the
fumes of the indicated temperature and, on the other, without
going down below 160 ° C.
Inspections and maintenance performed
professionally and according to a regular
schedule as well as the use of original spare
parts are of the utmost importance for fau-
lt-free operation of the boiler and to
guarantee its long life.
Yearly maintenance of the appliance is
mandatory in compliance with Laws in force.
Failure to perform Inspections and Mainte-
nance can entail material and personal
damage.
We therefore recommend stipulating an inspection
or maintenance contract.
Inspections help to determine the actual status of the appliance
and to compare it with the nominal status. This is done through
measuring, controls and observation.
Maintenance is required to eliminate any differences between
the actual status and the nominal status. This is normally done
by cleaning, setting and replacing individual components
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 appliance
and to avoid altering its approved status, only
original Unical spare parts must be used.
Before proceeding with maintenance, always perform the
following 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 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.
• Reconnect the appliance to the electric mains and engage
the switch.
• Make sure the appliance is gas tight and watertight.
• Vent the heating system and restore pressure if necessary.
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.
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