Installation manual

42 RIVA PLUS COMBI MANUAL
15. Commissioning Cont.
15.4 Adjustment of the gas pressure:
• Remove the front panel of the case.
• Take off the lid of the sealed chamber.
• Open the gas valve inlet pressure test
point (16 in Fig. 15.4) at the valve input,
connect a suitable pressure gauge and
check the gas pressure of the supply net-
work.
• Remove the gauge and close the pres-
sure test point 16.
• Open the gas valve outlet pressure test
point (15 in Fig. 15.4) and connect the
gauge.
•
Figure 15.4
• Remove the protection cap I (Fig. 15.5)
from the mechanical pressure adjustment
components levering with a at screw-
driver in slots H.
• Start the boiler at its maximum power.
Figure 15.5
• Ensure that the boiler is not range rated.
• Rotate the maximum gas pressure adjust-
ment (F in Fig. 15.4) until you obtain the
required pressure (by rotating clockwise
the pressure increases).
• Turn the boiler off and disconnect one of
the two connectors (E in Fig. 15.4).
• Start the boiler and rotate the minimum
gas pressure adjustment (G in Fig. 15.4)
until you obtain the required pressure (by
rotating clockwise the pressure increases).
• Turn the boiler off and re-connect the wire
to the modulating operator.
• Start the boiler and check again the maxi-
mum gas pressure setting.
• Turn the boiler off and disconnect the
gauge.
• Close the lid of the sealed chamber.
Important: after the checks all of the test
points must be sealed.
15.5 Checking the ignition device:
With the burner on high re close the gas cock. After three ignition attempts (within about three
minutes), the lock-out signal lamp must appear (D on Figure 15.2). To reset the boiler turn the
knob B (gure 15.2) on the 0 position and then press and release the boiler reset button (C on
Figure 15.2).