9,,&20%867,21&21752/
Check that the boiler is properly adapted to the gas
used, otherwise change the gas.
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6(59,&(35(6685(&21752/
3
= Network gas pressure (upstream gas valve):
Natural gas H G20: 20 mbar,
Propane G31: 37 mbar or 50 mbar.
3
= Gas pressure at the gas valve regulator outlet,
with pressure servo-system.
3/
= Servo-system air pressure (burner-gas val-
ve).
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Prior to any servicing cut the electrical and gas sup-
plies.
The boiler is preset for natural gas H (G20) 20 mbar.
When changing the gas the "gas setting" label that
is in the gas change sleeve must be fixed on the in-
side of the boiler’s door so as to indicate the new
setting.
K
P 2
P 1
)LJ
.
Adjusting screw for the parallel shifting of the characteristic. This screw is preset. Its setting must not be
modified even for changing gas. If however an adjustment is required, it may be carried out
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UDWHRQO\
with a low scale pressure gauge 0-10 mmCE, and
D&2
&2DQDO\VHU
. By screwing the pres-
sure to be controlled in P
2
is increased.
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