IDEAL Concord CXSD 40 User manual

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Concord
CXSD 40 - 120
User’s guide to commercial central heating boilers

2Concord CXSD - User's Guide
electrically isolate the boiler.
WARNING.
This appliance MUST be efficiently earthed.
This appliance must not be subject to incorrect use:
It is ESSENTIAL that the instructions in this booklet
are strictly followed, for safe, economical operation
of the boiler.
The CXSD incorporates an advanced microprocessor based
control system which operates all electrical functions of the
boiler including automatic ignition, flame detection,
thermostatic control, and high/low burner operation. In
addition, the microprocessor also has onboard
commissioning and servicing instructions and a fault
diagnosis programme.
ON / STANDBY [1/0] BUTTON
Turns the boiler ON and to STANDBY.
When this switch is in the STANDBY position the display will
show :-
On initial start up the boiler will indicate the hardware and
software code, the boiler type, and indicate if the boiler is ON
or at STANDBY.
To switch the boiler ON press the On/Standby [1/0] button.
The display will show :-
This display will be retained for 5 seconds before the
information screens are displayed.
INFORMATION SCREENS
If the boiler is at STANDBY the rotating information screens
will not be in evidence.
See Frame 6 for details on information screens.
2 FEATURES OF THE CONTROL SYSTEM
In addition to the operational characteristics described above,
the control system incorporates the following features
accessible to the user or service engineer:
ADJUSTABLE BOILER TEMPERATURE CONTROL
This is factory preset at 85 oC but may be adjusted by the user
between 60 and 85 oC.
PROGRAMMER TIMER
A maximum of 3 time periods per day can be programmed in
to the boiler.
Note. This is a boiler timer only and does not replace a
conventional system programmer serving more than one
heating zone.
OUTSIDE SENSOR (Optional extra)
If the optional outside sensor is fitted, the control system will
recognise this and automatically regulate the boiler flow
temperature with respect to changes in the external
temperature. If the sensor is fitted, an extra status information
screen will appear stating whether the device has been
activated or not (i.e. Sensor on/off).
COMMISSIONING INSTRUCTIONS
These are provided to assist the installer to commission the
boiler.
1 THE CXSD CONTROL SYSTEM
The Gas Safety (Installation and Use)
Regulations 1994, amendments 1996 or rules
in force impose certain statutory obligations on gas
users. This appliance must be installed by a CORGI
registered installer.
WARNING.
The ON/STANDBY [1/0] button does NOT
Display
Up / down buttons On / standby button
CAUTION. To avoid the possibility of injury during the use or cleaning of this
appliance care should be taken when handling edges of sheet steel components.

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 oCbut 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 oC 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 75oC.
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 buttonCopy button

4Concord CXSD - User's Guide
6 USING THE BOILER FEATURES AND CONTROLS
The diagram below shows the sequence of steps to be taken when reading the instructions on the following pages.

5
Concord CXSD - User's Guide
7 USING THE BOILER FEATURES AND CONTROLS - continued
ON / STANDBY [1/0] BUTTON
Turns the boiler ON and to STANDBY.
WARNING.
STANDBY does NOT electrically isolate the boiler.
When this switch is in the STANDBY position the display will
show :-
To switch the boiler ON press the On/Standby [1/0] button.
The display will show :-
This display will be retained for 5 seconds before the
information screens are displayed.
INFORMATION SCREENS
On initial start up the boiler will indicate the hardware and
software code, the boiler type and indicate if the boiler is ON
or at STANDBY.
If the boiler is at STANDBY the rotating information screens
will not be in evidence.
If the optional outside temperature kit, enabling weather
compensation, has been fitted the display will indicate the
compensated set point temperature.
An example of the display is as follows :-
MONDAY
14 : 10 19 / 09 / 94
ON HIGH 50°°
°°
°C
HOURS RUN 250
TEMP SET 82°°
°°
°C
PROGRAMMER ON
"ENTER" FOR MENU
MENU
To access the menu screen ensure that the information
screens are being displayed.
Any key, except the [1/0] button, may now be pressed to
access this feature but, as indicated on the information
screen, the [ENTER] button is the preferred means.
On entering this option the first screen displayed will be:-
The [DOWN] button can be pressed consecutively to access
the features required, which are as follows:-
If the weather compensation option is fitted then a further
screen will be displayed after commissioning.
The [UP] button will access the above options in reverse.
When the option required is displayed and the [ENTER]
button pressed another set of menus will be available as
discussed on the following pages.
PROGRAMMER TIMER
The programmer has 3 time zones per day for each day of
the week. Each day can be programmed for the
requirements of that day, giving 7 programmed days, or,
using the [Copy] facility, any number of days can be the
same. If a particular time zone is not required then the ON
and OFF periods should be programmed for the same
time.
Each button has an auto repeat function.
The programmer is based on a 24 hour clock and the
boiler comes with a default programme set for :-
All Day
The boiler will respond to this programme unless an
alternative is programmed in.
Using the [UP] or [DOWN] button select the "Programmer
Timer" from the menu and press [ENTER]. The following
menus will be available using the [UP] or [DOWN] buttons:-
or
or
or
To select any of the above use the [UP] or [DOWN] button
until the option required is displayed and press [ENTER].

6Concord CXSD - User's Guide
If the [YES] button is pressed and the programmer is in an
OFF period the boiler will be brought on for one hour,
subject to external controls. If the boiler is ON with less than
one hour to a programmed OFF period then the difference
between this time and one hour is the time of the extended
on period. If the boiler is in the 24 hour mode then this
option will have no effect.
If this advance has been selected, to cancel it then the
same procedure should be followed but the [NO] button
pressed.
PROGRAMME HOURS
Enables a user-timed programme to be entered.
The following display will be available:-
with the hours, 06, flashing.
Using the [UP] or [DOWN] button select the correct hour,
and press [ENTER]. The minutes will now flash and the
correct minutes should be selected, using the [UP] or
[DOWN] button followed by pressing [ENTER].
This will cause the hours to flash and if the correct ON time
has been entered the [EXIT] button should be pressed. The
display will now show the OFF for time zone one.
This procedure should be repeated for all 3 time zones for
Monday.
After the last [EXIT] the display will ask if this day's
programmes require to be copied to Tuesday. If the [YES]
button is pressed Tuesday's programme will be the same
as Monday. This action can be repeated for all the days or
as many as required,
If the [NO] button is pressed then all 3 time slots will need
to be programmed with the required times.
TEMPERATURE SET POINT
Enables the temperature at which the boiler is required to
operate to be set. It has a range of 60 - 85 oC.
Using the [UP] or [Down] button select the TEMP SET from
the menu and press [ENTER]. The following will be
displayed:-
with the temperature flashing.
8 USING THE BOILER FEATURES AND CONTROLS - continued
STATUS
Enables the selection of programme hours, all day usage or
24 hour.
If the "Programme Hours" option is selected the boiler will go
on and off subject to the times programmed.
If ALL DAY usage is selected the boiler will come on at the
first "ON" period selected and off on the last "OFF" period
selected, ignoring all other time settings. Based on the above
default programme this means the boiler would run, subject
to any other external controls, from 07:30 to 22:00 hours.
If 24 HOUR is selected the programme times will be ignored
and the boiler will run subject to the external controls until one
of the other options is again selected.
SET TIME/DATE
Enables the correct time and date to be entered.
The display will show a flashing day of the week as follows :-
The correct day can be selected by use of the [UP] or [Down]
button and when correct the [ENTER] button should be
pressed. The time and date will now be displayed as
follows:-
with, first, 2 digits, the hours, flashing.
By use of the [UP] or [Down] button the correct hour is
selected and the [ENTER] button pressed. The minutes will
now be flashing and, by use of the [UP] or [DOWN] button, the
correct minutes selected and the [ENTER] button pressed.
This method is repeated until the correct day, month and year
are selected. On selecting the correct year and pressing
[ENTER] the hours will flash then, if all the data is correct, the
[EXIT] button should be pressed for the control to accept this
information.
ADVANCE
Enables the programme to be advanced by one hour.
The following display will be available:-

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 oC 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 oC, in the example above 85 oC, 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 oC,
whichever is the greater time.
If the boiler load is such that it cycles between high and low
operation the boiler will fall through 30before 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 oC 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
For 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.

Caradon Plumbing Limited, P.O. Box 103, National Ave, Kingston upon Hull, HU5 4JN. Telephone: 01482
492 251 Fax: [phone]. Registration No. London 322 137. Registered Office: National Avenue,
Kingston upon Hull, HU5 4JN. A subsidiary of Caradon plc
Caradon Plumbing Limited pursues a policy of continuing improvement in the design and performance of its products. The right
is therefore reserved to vary specification without notice.
May 2000 154 872 A01
Ideal Installer/Technical Helpline: 01482 498376