Main MULTIPOINT FF User Operating, Installation And Servicing Instructions page 21

Fig. 26 - Max. adjustment position
Fig. 27 - Min. adjustment position
Fig. 28 - Gas type selection
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15.5 Service adjustment
15.5. 1 Max and Min gas rate adjustment
Do NOT use magnetic tools to adjust the gas valve.
Always adjust the MAXIM U M rate B EFOR E the
MINIMUM.
It is only necessary to adjust the minimum gas rate if the
burner frequently goes out when the water flow is
reduced toward the minimum specified.
Set the main switch to position O (off).
On the control unit front panel, place the rotary
temperature control knob at position '60', press and hold
the burner indicator button (Fig 3, key 13) and set the
main switch to position I (on). The green burner indicator
button blinks.
Open a hot water tap. The appliance is operating at its
maximum power. Perform the maximum gas adjustment
on the corresponding screw (Fig 22 pos 3) to the value
stated in Table 1, page 6.
On the control unit front panel, place the rotary
temperature control knob at position '55'. The appliance
works at its minimum power. Perform the minimum gas
adjustment on the corresponding screw (Fig. 22, pos. 2)
to the value stated in Table 1.
Replace the transparent plastic cover on the gas valve
and confirm the adjustments for maximum and minimum
by repositioning the rotary temperature control knob at
position '60' and position '55' and observing the
pressures.
Set the main switch to position O (off), close the hot
water tap and set the main switch to position I (on).
The setting of maximum and minimum gas rates is now
complete.
15.5.2 Gas Type
The control unit is factory set for the appliance gas type
(natural gas).
It may be necessary to repeat the instruction after a major
technical intervention. This task is made electronically by
programming the control unit.
Set the main switch to position O (off).
On the control unit front panel, place the rotary tempera-
ture control knob at position '35' (for natural gas). Press
and hold the burner indicator button ( Fig 3, key13) and set
the main switch to position I (on). The green burner indica-
tor button blinks.
Without opening any hot water tap, hold in the burner indi-
cator button for approximately 2 seconds until the red reset
button blinks. Switch the appliance off and back on again.
The gas type selection operation is complete.
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