54
E020
The reset procedure consists of pressing the “MENU/RESET”
button two times: the first time to request a reset procedure, the
second to confirm it.
E020
CONF?
At this point, if the correct operating conditions have been restored,
the boiler will restart automatically. There are a maximum of 3
consecutive attempts to reset a fault. In case of all the attempts
are exhausted, the definitive fault “E099” occurs on display. In that
case the appliance will need to be disconnected briefly from the
electrical supply. Once the electrical supply has been restored,
further attempts can be carried out.
E099
9
WARNING:
If the attempts to reset the boiler are unsuccessful,
call a qualified technician.
9
WARNING:
If in the “Start-up Phase” and the sliding message
“WAIT COMM.” persists, call a qualified technician.
NOTICE:
If communication between SC07 front control and boiler
is lost, “COMM.LOST” appears on the display: contact a qualified
technician.
11 .17
Temporary switch-off
In the event of temporary absences (weekends, short breaks, etc.)
set the status of the boiler to OFF by pressing
the
“MODE/OK”
button until the display shows “-OFF-“.
-OFF-
While the electri
cal supply and the fuel supply remains active, the
boiler is protected by the following:
-
heating anti-freeze:
this function is activated if the temperature
measured by the supply sensor drops below 41°F (5°C). A heat
request is generated in this mode with the ignition of the burner
at minimum output, which is maintained until the outlet water
temperature reaches 95°F (35° C);
-
domestic hot water anti-freeze:
the function starts if the
temperature measured by the DHW NTC sensor falls below 41°F
(5°C). A heat request is generated in this mode with the ignition
of the burner at minimum output, which is maintained until the
outlet water temperature reaches 131°F (55° C);
-
domestic hot water anti-freeze (only an indirect water tank
is connected - heating only boiler model):
the function starts if
the temperature measured by the indirect tank sensor falls below
41 °F (5 °C). A heat request is generated in this phase with the
ignition of the burner at minimum output, which is maintained
until the outlet water temperature reaches 131 °F (55 °C.).
9
The activation of the ANTI-FREEZE function is indicated by the
icon displayed on the front control.
- circulator anti-seize:
the circulator activates every 24 hours of
stoppage for 30 seconds.
11 .18
Switching off for long periods
If the boiler is not used for a long time, the following operations
must be carried out:
- set the status of the boiler to OFF by pressing the “MODE/OK”
button till the display shows “-OFF-“
-
se
t the system’s main power switch to “off”
-
close
the fuel and water taps of the heating and domestic hot
water system.
9
WARNING:
In this case, the anti-freeze and anti-seize systems
are deactivated. Drain the heating and domestic water system
if there is any risk of freezing.
-OFF-
11 .19
Replacing of the PCB board
The configuration operations should be carried out by professionally
qualified personnel.
When replacing the AKM11 electronic board, the spare part PCB
is configurated with the parameters shown in the column “VALUE
FACTORY SET” in the PARAMETERS’S LIST (see section “11.11
Access to the PARAMETER menu” page 47).
It is necessary for the installer to verify the parameters of the
replacement PCB match the boiler and the application.
11 .20
Remote devices presence
Remote control OTBus
In case the boiler is connected to a remote control OTBus, the
boiler display shows the “ OT+ ” message.
In this situation it is possible to reset a fault by pressing the “MENU/
RESET” button and to modify the CH setpoint (only if zone valve has
been previously enabled); the other boiler functions are disabled.
OT+
