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2

Concord 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 

o

C but may be adjusted by the user

between 60 and 85 

o

C.

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.

Summary of Contents for Concord CXSD 40

Page 1: ...U S E R S I D E A L I D E A L I D E A L I D E A L I D E A L T H E T H E T H E T H E T H E G U I D E Concord CXSD 40 120 User s guide to commercial central heating boilers...

Page 2: ...OL 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...

Page 3: ...rn 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 t...

Page 4: ...4 Concord 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...

Page 5: ...on 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 f...

Page 6: ...0 85 o C 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...

Page 7: ...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...

Page 8: ...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 p...

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