In the header, you can see the status of the following signals:
E1 for Extern 1,
K for measuring mode button,
E for calibrate,
R for heat exchanger cleaning and
A for request.
Boiler status
The status of the boiler is shown in the first line:
Status message Description
Off Boiler is switched off
Ready (+Req): Boiler is switched on but only reheats if the boiler water set
temperature was undershot by 8 °C – for systems with buffer
tank, falling 4 °C below the set boiler temperature is sufficient.
Ready (-Req): The boiler is switched on but does NOT heat up because there
is no heat consumption.
Ready (-Ext1): Boiler is switched on, however, does not reheat because input
"Extern 1" is open.
Ready(-SB): The boiler is switched on but does NOT heat up because the
second boiler is in operation.
Ready(-CS): The boiler is switched on but does NOT heat up because the
conveyor system is in operation
Ready(-Cleaning): The boiler is switched on but does NOT heat up because the
cleaning is in operation
Ready (+Wait time) The boiler is switched on but does NOT heat up because the
request has been present for less than 2 minutes
Operation(Cleaning): An independent cleaning is taking place in the running com-
bustion operation.
Measuring mode: System in measuring mode
Afterrun: Fuel supply is shut down, the fans continue to run on for a de-
fined period of time
Restart: The system restarts
Afterrun fault: System is in afterrun due to a fault
Fault off: System is switched off, a fault is additionally present
Maintenance: System running in relay test (specialist!)
Ignition start induced draught: The system starts, the induced draft starts up
Ignition CS filling: Conveyor system pushes fuel
Ignition feeding Boiler pushes fuel and checks whether the flue gas tempera-
ture increases due to fuel bed ignition. Electrical ignition only
occurs if the embers are extinguished.
The commands of the KWB Comfort 3 control
6
Operational state
B KWB Easyfire EN, 05.2011
31
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