Adjustments; Anomalies - Ferroli Pegasus LN 2S Serie Mode D'emploi, Installation Et Entretien

Turning off
Close the gas cock ahead of the boiler, turn knob "8" to the 0 position and disconnect the electrical power.
To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all water from
the boiler and the system water; or add a suitable antifreeze to the heating system.
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.

1.4 Adjustments

System temperature adjustment
Turn knob 7 (Fig. 1) clockwise to increase the heating water temperature, turn anticlockwise to decrease it. The
temperature can be varied from a minimum of 30°C to a maximum of 90°C. However, it is advisable not to operate
the boiler below 45°C.
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature desired in the rooms. Controlled by the room thermostat, the
boiler lights and delivers water to the system at the temperature set by boiler adjustment thermostat 7 in fig. 1.
The generator turns off when the desired temperature in the rooms is reached.
If the room thermostat is not installed the boiler will keep the system at the temperature set by the boiler control
thermostat.
Water system pressure adjustment
The filling pressure with system cold, read on boiler hydrometer part 2 of fig.1, must be about 1.0 bar. If, during
operation, the system pressure falls (caused by the evaporation of gas dissolved in the water) to values below the
minimum described above, the user must bring it back to the initial value by operating the filling cock. At the end
of the operation always close the filling cock.

1.5 Anomalies

Listed below are the anomalies that can be caused by simple, user-solvable problems.
Symbol Fault
Boiler blocked by the flame controller
Boiler shutdown due to insufficient system
pressure (only if a water pressure switch is
installed)
Boiler shutdown due to
water overtemperature
Before calling the assistance service, check that the problem is not due to there being no gas or electri-
city.
28
Cure
Make sure that the gas cocks ahead of the boiler and on
the meter are open.
Press the lit pushbutton-indicator light.
In case of repeated shutdowns, contact the nearest
assistance centre.
Fill the system to 1-1.5 bar cold by means of the system
filling cock.
Close the cock after use.
Unscrew the safety thermostat cover and press the button
below.
In case of repeated shutdowns, contact the nearest
assistance centre.
Cod. 3540G310 - 03/2007 (Rev. 02)
Pegasus LN 2S
EN