5
USER GUIDE
CONTROL SETTINGS
The boiler is controlled by the MCBA (microprocessor), with the
control panel housed behind the front panel.
Standby Mode
Standby Mode is the normal operation display setting.
The first digit shows the boiler sequence. This sequence relates to
current boiler status. The last two digits show the boiler temperature.
If the burner is turned off because of an extra protection, the display
shows boiler-sequence 9 and the flow-temperature. This alternates
with the error code eg. b26
Sequence
0
1
2
3
4
5
6
7
8
9
A
G
H
L
t
Boiler status
Stand By, no heat request
Pre-purge, post-purge
Ignition
Burning in CH-mode
Burning in DHW-mode
Waiting for opening of Air pressure switch (max. 1 Min.)
Waiting for closing of Air pressure switch (max. 2 x 1 Min.)
Burner off because the set-value has been reached
Overrun time pump in CH-mode
Overrun time pump in DHW-mode
Burner off because of protection:
• “b08”: airflowsensor did not close
• “b18”: T1 > 95 °C
• “b19”: T2 > 95 °C
• “b24”: T2 - T1 > 10,20 or 40 °C after 19 minutes
• “b25”: dT1/dt > Maximum Gradient T1
• “b26”: Minimum gas or water pressure switch not closed
• “b28”: no fan signal
• “b29”: fan signal, incorrect fan rotation
• “b30”: T1 - T2 > Max. delta
• “b33”: NTC3 short circuit
• “b35”: NTC5 short circuit
• “b38”: NTC3 open circuit
• “b40”: NTC5 open circuit
• “b52”: T5 > T5max
• “b61”: airflowsensor closed
• “b65”: wait for fanstart
Internal control
Burner on for holding boiler warm
Burner-high function: Testmode max. RPM in CH-mode
Burner-low function: Testmode min. RPM in CH-mode
Burner on for manual fanspeed (servicing)
Changing the MCBA settings: Parameter mode
Proceed as follows:
•
Press the “MODE” button once; the display will show “PARA”.
Press the “STEP” button once; the first digit is “1” and the last
two show the setting for the first parameter.
•
To change these last two, press “+” to increase and “-” to decrease.
•
Save the new setting selected with the “STORE” button.
•
To access the next parameter, press “STEP”.
•
Press the “MODE” button twice to return to standby mode.
List of accessible parameters:
Temperature measurement display: Info mode
Proceed as follows:
•
Press the “MODE” button twice; the display will show “INFO”.
•
Press the “STEP” button once; the first digit is the measurement
number and the last two its value.
•
Press the “STEP” button to display the next measurement.
•
To return to standby mode, press the “MODE” button once.
List of measurements available:
Parameter N°
1
2
3
4
Range
20 - 90 °C
O = OFF; 1 = ON
O = OFF; 1 = ON
60 - 90 °C
Description
hot water setting
“Hot water” system status
“Heating” system status
Heating setting
Measurement N°
1
2
3
4
5
6
7
8
9
Description
Temperature T1 - primary
Temperature T2 - primary
Temperature T3 - secondary
Outside temperature T4
Flue gas temperature T5
Setting for T1
Variation of T1 - °C/s
Variation of T2 - °C/s
Variation of T3 - °C/s
