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664Y3300
mCBA pARAmETERS FoR THE SpECIALIST
standBy mode
standby mode
When the boiler is powered on, it starts up in Stand-by mode, as
shown in the figure above.
This is the standard mode of the MCBA. The MCBA automatically
returns to this mode after 20 minutes if no key is pressed on the
display. The modified parameters then become active.
The first digit indicates the boiler’s current status, depending
on the situation of the boiler and the burner. The last two digits
indicate the temperature.
Once the cause of the lockout has been resolved, the burner
starts up automatically after a maximum of 150 seconds.
If the burner is blocked for one of the above reasons, the screen
displays, in turn, 9 followed by the temperature (last two digits)
and b with the error code.
Status
Boiler function
Internal inspection — Three-way valve
Boiler’s burner in temperature maintenance
function
Test function: max central heating power
Test function : min. central heating power
Test function: boiler with fixed number of
revolutions
Status
Boiler function
Standby, no heat demand
Fan pre-purge / post-purge
Ignition
Operation of the boiler’s burner for heating
Operation of the boiler’s burner for domestic hot
water
Waiting for signal from the air pressure switch or
to obtain number of start revolutions.
The burner turns off once the set value has been
reached. There is a heat demand nonetheless.
Circulator time delay after the heating demand.
Circulator time delay after the hot water demand.
Blocked burner:
•
: T1 > 95°C
•
: T2 > 95°C
•
: T2 - T1 > 10°C after 90 seconds
•
: dT1/dt > maximum gradient T1
•
: low water or gas pressure switch not closed
•
: no tachometer signal
•
: erroneous tachometer signal
•
: T1 - T2 >
∆
T max.
•
:
Short circuit NTC 3
•
: Short circuit NTC 5
•
: interruption NTC 3
•
: interruption NTC 5
•
: T5 > T5 max
•
: waiting for fan to start
Summary of Contents for 120
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