Service And Maintenance; Adjustments - Ferroli PEGASUS F2 N 2S Instructions For Use, Installation And Maintenance

3. SERVICE AND MAINTENANCE

3.1 Adjustments

All adjustment and conversion operations must be carried out by Qualifi ed Personnel.
The manufacturer declines any responsibility for damage or physical injury caused by unqualifi ed and
unauthorized persons tampering with the device.
Adjusting the burner gas pressure
The Pegasus F2 N 2S boilers are made to burn natural or liquid gas. The pressure setting and
test are performed in the factory.
However, as there may be changes in supply pressure, at the time of the fi rst ignition it will be
necessary to check and perhaps adjust the pressure at the nozzles, observing the values given in
the technical data chart in paragraph 4.3.
The operations for adjusting the pressure are performed with the boiler working, using the pressure
control on the 2-stage gas valves (see Fig. 14).
Preliminary operations:
1 Ignite the boiler and turn the control thermostat knob onto minimum.
2 Connect a pressure gauge to the pressure point on the gas manifold pipe of the burner
assembly (see part 15 in Fig. 24).
3 Take off the cover protecting the pressure regulator 4 (Fig. 14).
Adjusting the minimum power (1st stage)
1 Slowly turn the adjustment thermostat knob clockwise as far as the 1st click; the gas valve will thus
be supplied solely on connections A and B (see Fig. 14).
2 Turn the screw 6 (Fig. 14), checking that the pressure corresponds to the values of the technical
data chart in paragraph 4.3.
Adjusting the maximum power (2nd stage)
1 Turn the adjustment thermostat knob onto maximum; the gas valve will now be supplied on
connections A, B and C (see Fig. 14).
2 Turn the screw 5 (Fig. 14), checking that the pressure corresponds to the values of the technical
data chart in paragraph 4.3.
For model 102 the adjustment operations must be performed uniformly on the two pressure
regulators.
The gas pressures measured at the burner gas manifold should be read at least 30 seconds after
making the adjustments, i.e. when the fl ame has stabilized.
On completing the adjustment operations, turn the burner on and off 2 - 3 times with the adjustment
thermostat and check that the pressure values are the ones you have just set; if this is not so, you need
to make another adjustment to bring the pressures to the right values.
Gas supply conversion
The unit can function with either Natural gas (G20-G25) or liquid gas (G30-G31) and is factory-set for use
with natural gas, as clearly shown on the packing and dataplate. Whenever the unit has to be used with
a different gas, a conversion kit will be required, proceeding as follows:
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Pegasus F2 N 2S