12.3 DISPLAY DURING OPERATION
During normal operation the text in the display shows the status of the boiler. In the following figures the possble
displays during normal operation are explained.
FIGURE 12.3 OPERATION SCREEN
Display during HEATING DEMAND
Heat demand type: Actual status:
H E A T I N G : S T A N D - B Y
> > > : 1 2 3 . 4
o
C ( 1 2 3 . 4
o
C )
Cascade Temperature Setpoint Measured temperature at control sensor
Communication
Can be turned off by altering P5 BJ
When there is no heat demand it always shows heating.
Display during HOT WATER DEMAND
Heat demand type: Actual status:
H O T W A T R : S T A N D - B Y
> > > : 1 2 3 . 4
o
C ( 1 2 3 . 4
o
C )
Cascade Temperature Setpoint Measured temperature at control sensor
Communication Thermostat = Coil Flow Temp.
Sensor = Water Setpoint Temp.
Can be turned off by altering P5 BJ
Actual status text descriptions
Actual status:
B o i l e r o f f
The boiler is turned off at the control interface.
N o d e m a n d
No heat demand signal is received from the room thermostat or calorifier sensor/thermostat.
S t a n d - b y
Room thermostat or calorifier sensor/thermostat heat demand present but setpoint is reached.
P r e - p u r g e
The fan is purging the combustion chamber before starting an ignition cycle.
P r e - i g n i t i o n
Ignition process has started but the gas valve hasn't been opened.
I g n i t i o n
The burner is attempting to ignite.
P o s t - p u r g e
The fan is purging the combustion chamber after burner switches off.
B u r n i n g 1 0 0 %
The burner is firing at the indicated rate.
Cascade Communication Indicator
NO CASCADE COMMUNICATION
> > > Screen 1
Display is fixed showing Screen 1
CORRECT CASCADE COMMUNICATION
> > Screen 1
> Screen 2
Display alternates between Screen 1 & Screen 2 at 1 second intervals
When heat is needed for the calorifier the text "HEATING" changes into "HOTWATR".
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