35
maxR
Pacc
Switching from METHANE to LPG :
• Remove the main burner.
• Remove the nozzles of the main burner
and replace them with ones of a diameter
corresponding to the new type of gas (see
Tables 3, 4, 5 and 6).
IMPORTANT: Copper gaskets must be
used.
• Reinstall the main burner.
• On the PC board, switch the MET- GPL
jumper to GPL (fig. 24).
• See points A, B and C below.
Switching from LPG to METHANE:
• Remove the main burner.
• Remove the nozzles of the main burner
and replace them with ones of a diameter
corresponding to the new type of gas (see
Tables 3, 4, 5 and 6);
IMPORTANT: Copper gaskets must be
used.
• Reinstall the main burner.
• On the PC board, switch the MET- GPL
jumper to MET (fig. 24).
• See points A, B and C below.
A) Regulating maximum output
• Check the pressure of the gas supply (see
Tables 3, 4, 5 and 6).
• Remove the plastic cap (C, fig. 25), on
the modulating coil, which protects the
pressure regulator adjusting screws.
• Connect a pressure gauge to point V (fig.
26).
• Position the
maxR
heat input regulator
(fig. 27) on maximum (turn fully
CLOCKWISE).
• Select WINTER on selector 2 (fig. 1).
• Start the boiler on chimney-sweep
mode (see 3.2.8.1.) and check whether the
MAXIMUM pressure corresponds to the
value in tables 3, 4, 5 and 6, depending on
the model.
• Regulate the maximum burner pressure on
nut K (external, fig. 28): turn CLOCKWISE to
increase or ANTICLOCKWISE to decrease the
pressure.
• In LPG-fired boilers, turn nut K fully
CLOCKWISE.
B) Regulating minimum output
- Check the pressure gauge connected to
point V (fig. 26).
- Disconnect the electrical wiring to the
modulation coil (M, fig. 26).
- Ignite the burner and check whether the
MAXIMUM pressure corresponds to the
value in tables 3, 4, 5 and 6, depending on
the model.
- Regulate the minimum pressure,
holding nut K still with a 10mm spanner:
turn screw W CLOCKWISE to increase or
ANTICLOCKWISE to decrease the pressure
(fig. 28).
- Reconnect the electrical wiring to the
modulation coil.
C) Final operations
Return the Pacc trimmer (fig. 27) to the
intermediate position and exit chimney-
sweep mode (see 3.2.8.1.); check that
burner ignition is correct and silent; if
necessary, adjust the ignition power on
the Pacc trimmer (clockwise to increase,
anticlockwise to decrease).
- Recheck the min and max gas valve
pressure values.
- Adjust finely as required (see A and B
above).
- Fit on the plastic cap C (fig. 25).
- Close the gas pressure check points.
- Check for gas leaks.
3.6.
Adapting to other gases and regulating the burner
This boiler is built to run on the type of gas specified on the order, which is shown on the packaging and on the boiler
rating plate.
If you wish to switch to another type of gas, this must be done by a qualified technician using the accessories supplied by
the manufacturer. He will make the necessary modifications and adjustments to ensure efficient operation of the boiler.
fig. 28
W
K
fig. 24
C
fig. 25
Jumper
position for
natural gas
Jumper
position for
LPG
fig. 27
fig. 26
V
M
