Ferroli PEGASUS F3 N 2S Instructions D'utilisation, D'installation Et D'entretien page 34

B
If, after correctly carrying out the lighting procedure, the burners do not light and
the button-indicator comes on, wait about 15 seconds then press the above-
mentioned button. The reset controller will repeat the lighting cycle. If the burn-
ers do not light after the second attempt, refer to the section sec. 4.4.
The boiler switch 7 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. 5.
Turning off
To temporarily turn the boiler off, just turn the boiler switch 7 (fig. 1) to 0.
To turn the boiler off for a prolonged period:
• Turn the knob of the boiler switch 7 (fig. 1) 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 shutdowns in winter, it is ad-
visable to drain all water from the boiler and the system; or add a suitable anti-
freeze 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. 8).
• 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. 5.3).
• The circulating pumps must not be blocked.
Safety devices
The boiler PEGASUS F3 N 2S is equipped with devices that guarantee safety in case of
operation faults.
Temperature limiter (safety thermostat) with manual reset
This device prevents the water temperature in the system from exceeding boiling point.
The maximum cut-in temperature is 110°C.
Automatic reset of the temperature limiter can only occur on cooling of the boiler (the
temperature must drop by at least 10°C) and identification and elimination of the problem
that caused the shutdown. To reset the temperature limiter, unscrew the cover 3 of fig. 1
and press the button below.
Opening the front casing
To open the boiler front panel, see the sequence in fig. 5.
fig. 5 - Front panel opening
B
Before carrying out any operation inside the boiler, disconnect the power and
close the gas cock upstream.
34
EN
1
2
cod. 3540T624 - Rev. 01 - 04/2018
PEGASUS F3 N 2S
Combustion analysis
A fume sampling point has been included in the upper part of the anti-backflow device
inside the boiler (see fig. 6).
To take the sample:
1. Remove the top panel of the boiler
2. Remove the insulation covering the anti-backflow device
3. Open the fume sampling point;
4. Insert the probe;
5. Adjust the boiler temperature to maximum.
6. Wait 10-15 minutes for the boiler to stabilise*
7. Take the measurement.
fig. 6 - Combustion analysis
Analyses made with a non-stabilised boiler can cause measurement errors.
A
Burner assembly removal and cleaning
To remove the burner assembly:
• Disconnect the power and turn off the gas ahead of the boiler.
• Undo the two screws securing the electronic flame controller (detail B - fig. 7) to the gas valve (de-
tail A - fig. 7) and remove the controller.
• Undo the screws fixing the connectors (F) to the gas valves and remove the connectors.
• Disconnect the ignition and ionisation cables (E) from the electrode assembly.
• Undo the nuts fixing the gas supply pipe ahead of the gas valves (detail C - fig. 7).
• Undo the two nuts fixing the combustion chamber door to the cast iron elements of the boiler (detail
D - fig. 7).
• Remove the burner assembly and combustion chamber door.
Then check and clean the burners. Only use a non-metallic brush or compressed air to clean the burners
and electrodes; never use chemical products.
Afterwards, refit everything in reverse order.
C
A
F
E
D
fig. 7 - Burner removal and cleaning
C
B
D