3
Concord CXSD -
User's Guide
FOR SHORT PERIODS (2-3 DAYS)
1.
Turn the boiler off by pressing the On/Standby [1/0] button
and viewing "Standby...0 " on the display.
2.
Wait 5 minutes, then switch off or unplug the electricity
supply to the boiler.
Note.
In severe weather, reduce the temperature set point to
60
o
C
but
do not
turn off the electricity supply and do leave the
"Boiler ON.....1".
FOR LONG PERIODS (End of the heating season)
1.
Turn the boiler off by pressing the On/Standby [1/0] button
and viewing "Standby...0" on the display.
2
. Wait 5 minutes, then switch off or unplug the electricity
supply to the boiler.
3.
Remove the casing lower front panel. Turn off the main
gas cock (The groove in the square head must be at right
SERVICING INSTRUCTIONS
These are provided to assist the service engineer.
FAULT DIAGNOSIS
In the unlikely event of a fault condition, the microprocessor
will identify the fault area and display a suitable message on
the display.
Further to these accessible features, there are other features
present in the system which the installer/service engineer
should be aware of.
HOURS RUN LOG
This feature enables the engineer to determine the workload
of the boiler.
3 FEATURES OF THE CONTROL SYSTEM - continued
4 TO LIGHT THE BOILER CONTROLS
5 TO SHUT DOWN THE BOILER
angles to the line of the pipe) and refit the lower casing
panel.
Note.
If severe weather (frost) conditions are anticipated during the
period of shutdown the system must be completely drained.
TO RELIGHT THE BOILER
AFTER SHORT PERIODS (2-3 DAYS)
Switch on the electricity supply to the boiler and press the
On/Standby [1/0] button to turn the boiler ON. If necessary
adjust the temperature set point etc. as required.
AFTER LONG PERIODS
Remove the casing lower front panel and turn the gas cock
ON.
Refit the casing front panel and follow the lighting
instructions above.
If the boiler fails to light after 5 attempts, the display will show:
In this case, the ignition sequence should be reset by
pressing the [COPY] button.
4.
If required adjust the programme timer temperature set
point or weather compensation (if fitted) as described in
"Using the boiler features and controls".
WARNING
.
STANDBY does
NOT
electrically isolate the boiler.
1.
Turn on the electricity supply. The display will initially
show a start-up code followed by:
2.
To switch the boiler on press the On/Standby [1/0]
button. The display will show :
then change every few seconds to indicate the boiler
status. The boiler will commence its ignition
sequence.
3.
The boiler should light, initially at low rate for a period
of approximately 3 minutes before proceeding to
maximum rate. If the boiler fails to light, allow the
controls to cycle until ignition is established.
PUMP OVERRUN
If the flow temperature is above 75
o
C at the time of boiler
shutdown, the controls will maintain pump operation until the
residual heat within the appliance has been dispersed and
the flow temp is below 75
o
C.
ANTI-CYCLE DEVICE
On any heating system, if the heating load is very low, there is
a tendency for the boiler to cycle on and off rapidly. This is
inefficient and can lead to shortened boiler life. The high/low
operating system of the CXSD minimises the risk of this but,
in addition, the controls prevent the boiler from short-cycling
by preventing subsequent ignition within a period of 2 minutes.
When active, the display will show "ANTICYCLE (Flow temp)".
Display
On / standby button
Copy button
