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

Pegasus F2 N T

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
Pegasus F2 N T boilers are made to burn natural 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 gas valves (see fi g. 11a - 11b).
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. 19).
3 Take off the cover protecting the pressure regulator 6 of fi g. 11a - 11b.
Gas conversion and pressure control with the "SIT 820 NOVA" valve
The main burner pressure setting is performed using screw 2 (fi g. 11a) that is turned clockwise to
increase the pressure and anticlockwise to decrease it.
The pilot light adjustment is made without using instruments, watching to see that the fl ame
correctly envelops the thermocouple without burning too much gas. To adjust this fl ame, turn
screw 5 (fi g. 11a).
To convert the boiler from natural gas to liquid gas, besides changing the nozzles it is necessary, taking due
care, to screw the pressure control screw 2 fully in and change the pilot burner nozzle.
Gas conversion and pressure control with the "HONEYWELL V4400C" valve
The main burner pressure setting is performed using screw 2 (fi g. 11b) that is turned clockwise to
increase the pressure and anticlockwise to decrease it.
The pilot light adjustment is made without using instruments, watching to see that the fl ame
correctly envelops the thermocouple without burning too much gas. To adjust this fl ame, turn
screw 5 (fi g. 11b).
To convert the boiler from natural gas to liquid gas, besides changing the nozzles it is necessary, taking due
care, to screw the pressure control screw 2 fully in and change the pilot burner nozzle.
The full kit for conversion to liquid gas (G30 - G31) is only supplied on request.
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.
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