Ferroli PEGASUS LN 2S Serie Instructions D'utilisation, D'installation Et D'entretien page 31

PEGASUS LN 2S
From liquefied to natural gas
Carry out the same operations described above, making sure to remove the ignition
"STEP" regulator 2 of fig. 6 of the gas valve; the cap 3 of fig. 6 must be fitted directly on
the valve.
fig. 6 - Gas conversion
Key of main components
1 Pressure point upstream
2 Ignition "STEP" regulator for liquefied gas
3 Plug
4 Protection cap
5 Pressure adjustment screw for max. power
6 Pressure adjustment screw for min. power (1st stage)
7 O-ring
8 Decrease
9 Increase
V Honeywell valve VR 4601 CB
Key of electrical connections
A + B = Connections fed for min. power (1st stage)
A + B + C = Connections fed for max. power (2nd stage)
4.2 Commissioning
B
Commissioning must be carried out by Qualified Personnel.
The following operations and checks must be carried out at first lighting, and after all
maintenance that involved disconnecting 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.
All manuals and user guides at all-guides.com
V
5
cod. 3540T612 - Rev. 01 - 02/2015
Light the boiler
• Open the gas valve ahead of the boiler.
• Vent the air from the pipe ahead of the gas valve.
• Turn on or insert any switch or plug ahead of the boiler.
• Turn the boiler switch (pos. 8 - fig. 1) to position 1.
• Turn the knob 7 (fig. 1) to a value above 50°C and that of the room thermostat (if
present) to the required temperature value. The burner will light and the boiler be-
gins to function 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-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 par. 3.4 "Troubleshooting".
The boiler switch 8 has 3 positions "0-1-TEST"; the first two have the on-off
8 function, the third (unstable) must only be used for service and maintenance
purposes.
9
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.
6
Checks during operation
• Make sure the fuel circuit and water systems are tight.
4
• 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 8 (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 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. 10).
• 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 LN 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. 7.
B
Before carrying out any operation inside the boiler, disconnect the power and
close the gas cock upstream.
1
2
fig. 7 - Front panel opening
EN 31