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CHECKING THE GAS SETTINGS
M290E.32CM - Min. gas pressure at the burner
Methane G20
Propane G31
1 mbar corresponds to approx. 10 mm H20
Figure 7.19
• Activate the "chimney sweep function" at
maximum output (parameter P06 at value
02).
• Recheck the maximum pressure at the
burner.
• To exit the chimney sweeper, reset the value
of parameter P06 to 00 or wait 15 minutes
with the boiler off (OFF).
• Close the domestic hot water cocks.
• Turn the boiler off by pressing the 17 button
(Figure 7.2) until the message OFF appears
on the LCD display (Figure 7.20).
Figure 7.20
During the operations to check maximum and
minimum pressure at the burner, check the
flow rate of gas to the meter and compare its
value with the gas flow rate data; see section
"Technical data M290E.24CM" on page 20,
"Technical data M290E.28CM" on page 22
and "Technical data M290E.32CM" on page
24.
IMPORTANT: Each time after measuring
the gas pressure, properly close all tap-
ping points that were used (27 and 29 in
(Figure 7.8). After each gas adjustment,
Pa
220
mbar
2,2
Pa
750
mbar
7,5
RESET
bar
the valve adjustment components must be
sealed.
7.3 Setting burner ignition
• Disconnect the boiler from the electric pow-
er supply.
• Make sure that the ambient thermostat is in
the "heat request" position.
• Open the tapping point 27 in Figure 7.8 and
connect a pressure gauge.
• Restore electric power to the boiler.
• Check that burner ignition occurs uniform-
ly and if necessary calibrate the ignition
level, referring to the ignition pressure ta-
bles in the section section "Technical data
M290E.24CM" on page 20, "Technical
data M290E.28CM" on page 22 and
"Technical data M290E.32CM" on page
24.
Calibrating ignition with methane gas
(G20)
• Make sure that the room thermostat is in the
"heat request" position.
• Draw off an abundant amount of DHW by
opening the taps
• Enter "programming mode" by holding down
buttons 17 and 18 for 5 seconds at the same
time (Figure 7.21). The code P00 appears
on the display, indicating entry into "parame-
ter P00" (Figure 7.22).
18
12
13
Figure 7.21
17
16
15
- 51 -
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