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DOMINA F24 N / F28 N / F32 N
4.2 Start-up
B
Checks to be made at first lighting, and after all maintenance operations that
involved disconnecting from the systems or work on safety devices or parts of
the boiler:
Before lighting the boiler
•
Open any on-off valves between the boiler and the systems.
•
Check the tightness of the gas system, proceeding with caution and using a soap
and water solution to detect any leaks in connections.
•
Check the correct preloading of the expansion tank (ref. sec. 5.4)
•
Fill the water system and make sure that all air contained in the boiler and the sys-
tem has been vented by opening the air vent valve on the boiler and any vent valves
on the system.
•
Make sure there are no water leaks in the system, hot water circuits, connections or
boiler.
•
Check the correct connection of the electric system and the functioning of the earth
system. l
•
Check that the gas pressure value for heating is as required.
•
Make sure there are no flammable liquids or materials in the immediate vicinity of
the boiler
Checks during operation
•
Turn the unit on as described in sec. 2.3.
•
Check the tightness of the fuel circuit and water systems.
•
Check the efficiency of the flue and air-fume ducts while the boiler is working.
•
Make sure the water is circulating properly between the boiler and systems.
•
Make sure the gas valve modulates correctly in the heating and domestic hot water
production phases.
•
Check the proper lighting of the boiler by performing several tests, turning it on and
off with the room thermostat.
•
Make sure the fuel consumption indicated on the meter matches that given in the
technical data table on sec. 5.4.
•
Make sure that, with no heating demand, the burner lights correctly on opening a hot
water tap. During heating operation, check that on opening a hot water tap the heat-
ing circulating pump stops and there is regular production of domestic hot water.
•
Check the correct position of the DIP SWITCHES.
4.3 Maintenance
Periodical inspection
To ensure proper operation of the unit over time, have qualified personnel carry out a
yearly inspection, providing for the following checks:
•
The control and safety devices (gas valve, flow switch, thermostats, etc.) must func-
tion correctly.
•
The fume exhaust circuit must be perfectly efficient.
(Sealed chamber boiler: fan, pressure switch, etc. - The sealed chamber must be
tight: seals, cable glands, etc.)
(Open chamber boiler: anti-backflow device, fume thermostat, etc.)
•
The air/fume terminal and ducts must be free of obstructions and leaks
•
The burner and exchanger must be clean and free of deposits. Do not use chemical
products or wire brushes to clean.
•
The electrode must be properly positioned and free of deposits.
•
The gas and water systems must be tight.
•
The pressure of the water in the system when cold must be approx. 1 bar; otherwise,
bring it to that value.
•
The circulating pump must not be blocked.
•
The expansion tank must be filled.
•
The gas flow and pressure must match that given in the respective tables.
The casing, control panel and aesthetic parts of the boiler can be cleaned with
A
a soft damp cloth, possibly soaked in soapy water. All abrasive detergents and
solvents should be avoided.
Opening the casing
To open the boiler casing:
1.
Undo the screws A (see fig. 12).
2.
Turn the casing (see fig. 12).
3.
Lift the casing.
B
Before carrying out any operation inside the boiler, disconnect the power supply
and turn off the gas cock upstream.
Combustion analysis
Two sampling points have been included at the top of the boiler, one for fumes and the
other for air. To take the samples:
1.
Open the air/fume outlet plug;
2.
Insert the probes as far as the stop;
3.
Check that the safety valve is connected to a drain funnel;
4.
Enter TEST mode;
5.
Wait 10 minutes for the boiler to stabilize;
6.
Take the measurement.
1 =
FUMES
2 =
AIR
cod. 3541E094 - Rev. 00 - 06/2014
A
1
A
fig. 12 - Opening the casing
1
2
fig. 13 - Fume analysis
3
2
19
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