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664Y2800.B
MCBA PARAMETERS FOR THE SPECIALIST
STANDBY MODE
Standby Mode
After you power down the appliance the screen displays Pilot
mode, as shown in the figure above.
This is the standard MCBA mode. The MCBA automatically
returns to this mode after 20 minutes if no keys have been
pressed on the screen. Any parameters that were modified are
then enabled.
The first character shows the current status of the boiler
depending on the condition of both the boiler and the burner. The
last 2 characters indicate the start temperature.
Once the cause of the blockage has been resolved, the burner
starts automatically within 150 seconds at most.
If the burner is blocked for one of the reasons mentioned above,
the screen display alternates between a 9 followed by the
temperature (two last digits) and b with the error code.
Status
Boiler function
Standby, no demand for heat
Fan first, fan after
Ignition
Operation of the boiler burner for the heating
Operation of the boiler burner for the
domestic hot water
Air pressure limit or obtaining
the number of start revolutions
The burner goes out when the specified value
is reached.
A demand for heat is present nonetheless.
Pump over-run time after the demand for
central heating
Pump over-run time after the demand for
domestic hot water
Burner blocked:
•
: T1 > 95°C
•
: T2 > 95°C
•
: T2 - T1 > 10°C after 90 seconds
•
: dT1/dt > maximum gradient T1
•
: water pressure switch not off
•
: no fan signal
•
: erroneous fan signal
•
: T1 - T2 >
Δ
max.
•
: NTC3 short-circuit
•
: NTC5 short-circuit
•
: NTC3 interrupt
•
: NTC5 interrupt
•
: T5 > T5 max
•
: wait for the fan to start
Status
Boiler function
Internal check — three-way valve
Boiler burner in hot water ready function
Test function: Central heating high power
Test function: Central heating low power
Test function: Boiler with fixed number of
revolutions