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SEVEN 67 ÷ 107 2S
4.2 Commissioning
B
Commissioning must be carried out by Qualified Personnel.
The following operations and checks must be made at first lighting, and after all mainte-
nance work involving disconnection from the systems or work on safety devices or parts
of the boiler.
Before lighting the boiler
•
Open any shutoff valves between the boiler and the system.
•
Check the tightness of the gas system, proceeding with caution and using soapy wa-
ter to check for any leaks in connections.
•
Fill the water system and make sure all air contained in the boiler and the system
has been vented by opening the air valve on the boiler and any vent valves in the
system.
•
Make sure there are no water leaks in the system or boiler.
•
Make sure the electrical system is properly connected.
•
Make sure the unit is connected to an efficient earthing system.
•
Make sure the pressure and gas flow values are those required for heating.
•
Make sure there are no flammable liquids or materials in the immediate vicinity of
the boiler.
Lighting the boiler
•
Open the gas cock ahead of the boiler.
•
Vent the air from the pipe ahead of the gas valve.
•
Turn on or insert the switch or plug ahead of the boiler.
•
Turn the boiler switch (pos. 8 - fig. 15) to position 1.
•
Turn the knob 7 (fig. 15) to a value above 50°C and that of the room thermostat (if
present) to the required temperature. The burner will light and the boiler starts to
work automatically, controlled by its adjustment and safety devices.
B
If, after correctly carrying out the lighting procedure , the burners do not light
and the button light comes on, wait about 15 seconds and then press the
above-mentioned button. The reset controller will repeat the ignition cycle. If the
burners do not light after the second attempt, consult the sec. 9.4.
The boiler switch 8 has 3 positions "0-1-TEST"; the first two have the on-off
function, the third (unstable) must only be used for service and maintenance
purposes.
In case of a power failure while the boiler is working, the burners will go out and
A
relight automatically when the power is restored.
Checks during operation
•
Make sure the fuel circuit and water systems are tight.
•
Check the efficiency of the flue and fume ducts while the boiler is working.
•
Make sure the water is circulating properly between the boiler and the system.
•
Check correct lighting of the boiler, by turning it on and off several times using the
room thermostat or boiler thermostat.
•
Make sure the fuel consumption indicated on the meter matches that given in the
technical data table in cap. 10.
Turning off
To temporarily turn the boiler off, just set the boiler switch 8 (fig. 15) to 0.
To turn the boiler off for an extended period:
•
Turn the knob of the boiler switch 8 (fig. 15) to 0;
•
Close the gas cock ahead of the boiler;
•
Disconnect the power to the unit;
B
To avoid damage caused by freezing during long idle periods in winter, it is ad-
visable to drain all the water from the boiler and the system; or add a suitable
antifreeze to the heating system
4.3 Maintenance
B
THE FOLLOWING OPERATIONS MUST ONLY BE CARRIED OUT BY
QUALIFIED PERSONNEL.
Seasonal inspection of the boiler and flue
It is advisable to carry out the following checks at least once a year:
•
The control and safety devices (gas valve, thermostats, etc.) must function correctly.
•
The fume ducts must be free of obstructions and leaks.
•
The gas and water systems must be tight.
•
The burner and boiler shell must be clean. Follow the instructions in the next section.
•
The electrodes must be free of deposits and properly positioned (see fig. 23).
•
The water pressure in the system when cold must be approx. 1 bar; otherwise bring
it to that value.
•
The expansion tank, if present, must be filled.
•
The gas delivery and pressure must correspond to that given in the technical data
table (see sec. 10.3).
•
The circulating pumps must not be blocked.
Safety devices
The boiler SEVEN 67 ÷ 107 2S is equipped with devices that guarantee safety in case
of operation faults.
Manual-reset temperature limiter (safety thermostat)
This device prevents the water temperature in the system from exceeding boiling point.
The maximum activation temperature is 110°C.
Resetting of the temperature limiter can only occur on cooling of the boiler (the temper-
ature must drop by at least 10°C) and identification and consequent elimination of the
problem that caused the shutdown. To reset the temperature limiter, unscrew the cover
3 of fig. 15 and press the button below.
Fume sensor (fume thermostat) safety device
The boiler is equipped with a fume evacuation control device (fume sensor - ref. 4 of
fig. 15). In case of anomalies in the fume exhaust system with consequent return of burnt
gases in the room, the unit shuts down. The antiwind grille is equipped with a tempera-
ture sensor bulb for detecting and controlling the fume temperature.
Any leaks of burnt gases into the room cause an increase in the temperature detected
by the bulb, which causes the boiler to turn off within 2 minutes, shutting off the gas to
the burner. If the fume sensor cuts in, unscrew the protection cover (ref. 4 of fig. 15) lo-
cated on the control panel and manually reset the device. The boiler will resume opera-
tion.
If the sensor has to be replaced due to a fault, only use original accessories and ensure
that the electrical connections and positioning of the bulb are correctly carried out.
B
The fume sensor must not be cut out for any reason!
Opening the front casing
To open the front panel of the boiler, refer to the sequence in fig. 19.
B
Before carrying out any operation inside the boiler, disconnect the electrical
power supply and close the gas cock upstream.
Combustion analysis
A fume sampling point has been included inside the boiler, in the top part of the anti-
backflow device (see fig. 20).
To take the sample:
1.
Remove the boiler top panel
2.
Remove the insulation placed over the anti-backflow device
3.
Open the fume sampling point;
4.
Insert the probe;
5.
Adjust the boiler temperature to max.
6.
Wait 10-15 minutes for the boiler to stabilise*
7.
Take the measurement.
Analyses made with an unstabilised boiler can cause measurement errors.
A
cod. 3541B940 - 03/2012 (Rev. 01)
fig. 5 - Front panel opening
fig. 6 - Combustion analysis
EN
13
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