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d.
Turn the screw anti-clockwise to decrease pressure (CO
• Remove the pressure gauge from the P1OUT port and connect to the P2OUT port of gas valve 2.
• Turn the adjuster screw K2 of gas valve 2 so as to set the pressure value (Pout) as indicated in table 2.1
for natural gas (G20) and in table 2.2 for propane (LPG):
• Check that the CO
value at minimum heat output is as indicated in table 2.1 or 2.2. The value can be
2
optimized by making the necessary fine adjustment to screw K2.
⇑
Figure 15a
IMportant: in the event of converting the boiler from natural gas (G20) to propane (LPG), the following
operation must be carried out before proceeding to adjust the gas valve as described above:
• For models with one valve, replace the diaphragm on the gas valve outlet (figure 14a).
To replace the diaphragm, disassemble the gas valve by undoing the inlet and outlet fittings, then unscrew
the nozzle with a pair of straight round nose pliers.
Check the fluid-tightness of the gas fittings removed previously.
• For models with two gas valves, replace the diaphragm located at the venturi inlet (figure 14b).
To enable this operation, the gas valve manifold must first be removed.
Check the fluid-tightness of the gas fittings removed previously.
• Set parameters h536 - h541 - h608 - h609 - h610 - h611 - h612 - h613 by way of the display on the
control panel.
The values to be set are given in tables 2.1 and 2.2. The programming methods are described in chapter 14.
InstructIons pertaInInG to the InstaLLer
2
Figure 15b
13.3 gas conversion
31
decreasing).
⇑
912.823.1 - GB
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