7
Concord CXSD -
User's Guide
1.
Always follow these instructions.
2.
Correct ventilation is essential for safe operation of the
boiler. Do NOT obstruct ventilation ducts, grilles or
openings in the boiler room, or the passage of
combustion and ventilation air to the boiler.
3.
Do NOT store objects around or on the boiler, and
keep access clear at all times.
4.
Switch OFF and disconnect the electricity before
carrying out maintenance work.
Remember !
The ON/STANDBY [1/0] button does
NOT
electrically isolate the boiler.
5.
Do NOT turn off the boiler if its is to be left unattended
in frosty weather.
9 USING THE BOILER FEATURES AND CONTROLS - continued
The [UP] and [Down] button should be pressed until the
correct temperature is selected and then the [ENTER] button
should be pressed and the temperature selected will
become stationary.
Pressing the [EXIT] button will ensure that the control
accepts the new setting and return to the menu.
High / Low Operation
In the example above, when the boiler flow temperature is
equal to 82
o
C the high rate gas valve will close, allowing the
boiler to run at low rate.
When the flow temperature exceeds the set temperature by
3
o
C, in the example above 85
o
C, the low rate gas valve will
close and the boiler will be off. The information screen will
display :
The boiler will remain OFF for a minimum of 3 minutes or
until the boiler flow temperature has dropped by 3
o
C,
whichever is the greater time.
If the boiler load is such that it cycles between high and low
operation the boiler will fall through 3
0
before the high rate
gas valve is energised.
Delayed High Rate Gas valve Operation
When the boiler is started from cold the high rate gas valve
will be delayed for 3 minutes and then energised. If the boiler
flow temperature is equal to or greater than 55
o
C then this
delay will NOT occur.
Notes.
1.
If a fault occurs with the boiler thermostat the fault
display screen will show "C/H Sensor Fault".
2.
When the low rate gas valve is de-energised as the
temperature required has been obtained the boiler will
go into an anticycle route for 2 minutes. The display
will indicate anticycle and the current flow temperature.
SERVICING
This is for use by the installer / service engineer only.
COMMISSIONING
This is for use by the installer / service engineer only.
OUTSIDE SENSOR (if fitted)
Information will be provided with the kit.
10 GENERAL CARE
WARNING
.
This appliance
MUST
be efficiently earthed.
CLEANING
F
or normal cleaning simply dust with a dry cloth.
To remove stubborn marks and stains use a damp cloth
and mild detergent.
Do NOT use abrasive cleaning materials.
MAINTENANCE
The boiler should be serviced at least once a year by a
CORGI registered installer.
