Chaffoteaux & Maury Centora green 24 Nat User manual

CONDENSING WALL HUNG COMBINATION BOILER
Heating and Instantaneous Domestic Hot Water - Fanned Flue system
Installation and Operating
Instructions
Centora green 24
Centora green 30
c
Manufactures N° Model Type Gas Council N°
200906806037.32 Centora green 24 Nat 47 - 980 - 21
200906822037.31 Centora green 30 Nat 47 - 980 - 24
GB IE

2
These instructions are suitable for the CENTORA GREEN boilers :
Do not forget the Log Book!
Chaffoteaux & Maury supports Benchmark, the heating industry code to ensure the correct installation, commissioning and
servicing of domestic central heating systems.
To The Householder
Make sure you have a completed Log Book for your boiler. This provides a record of the commissioning of your boiler.
It contains important information about your particular installation that may be required by service engineers. The Log Book will
also provide contact details for the installer should you need guidance in the use of this appliance or if there are any problems.
As with your car, your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service
check. The service history of the appliance will be recorded on the Log Book.
In the unlikely event of any problems with your boiler or system you should first contact your installer. If your installer cannot
resolve the problem he should telephone our national service helpline.
This appliance is a combined appliance for the production of Central Heating (C.H.) and Domestic Hot Water D.H.W.)
This appliance must only be used for the purpose for which it is designed. THe manufacturer declines all responsibility for
improper or negligent use.
Acharge may be made if Chaffoteaux & Maury Service is called out to resolve a non-product related fault.
Your statutory rights are not affected.
Do not allow children or inexperienced persons to use the appliance without supervision.
If you smell gas in the room, do not turn on or off light swithces, use the telephone or any other objects that might cause
sparks.
Open doors and windows to ventilate the room.
Shut the gas mains tap (on the gas meter) or the valve of the gas cylinder and call your Gas Supplier immediately.
If you are going away for a long period of time, remember to shut the mains gas tap or the gas cylinder valve.
Before any intervention within the boiler it is first necessary to isolate the electrical power supply by turning the
external switch to “OFF”
CUSTOMER CARE
Chaffoteaux & Maury Ltd., as a leading manufacturer of domestic and commercial water heating appliances is committed to
providing high quality products and a high quality after sales service. If it is necessary to contact an engineer, then telephone
the national warranty helpline 0870 600 9888.
Advice on installation or servicing can also be obtained by contacting the Technical Department on:
Tel: [phone]
Fax: [phone]
GUARANTEE
The manufacturer’s guarantee is for 12 months from the date of purchase. The guarantee is invalidated if the appliance is not
installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist us
in providing you with an efficient after sales service, please return the guarantee registration card enclosed with the boiler
without delay.
TO CONTACT C&M SERVICE, PLEASE CALL THE NATIONAL WARRANTY HELPLINE ON:
0870 600 9888
To The Installer
As part of the commissioning of this appliance it is vital that the Log Book is completed and given to the Householder. Please
ensure that your customer is aware of the importance of keeping the Log Book safe as a record of the installation and the
appliance service history.
Please ensure that your customer is aware of the correct operation of the system, boiler and controls.

3
CUSTOMER CARE Page
Guarantee ............................................................................................................................................................2
Statutory Requirements .......................................................................................................................................2
Contents ...............................................................................................................................................................3
INTRODUCTION ..................................................................................................................................................4
INSTALLER’S INSTRUCTION.............................................................................................................................5
1DESCRIPTION.................................................................................................................................................5
2 DIMENSIONS .................................................................................................................................................6
3 HYDRAULIC DATA .........................................................................................................................................6
4 INSTALLATION REQUIREMENTS .................................................................................................................7
Location ...................................................................................................................................................7
Flue..........................................................................................................................................................7
Ventilation ................................................................................................................................................7
Gas Supply .............................................................................................................................................7
Electrical Supply ....................................................................................................................................7
Showers...................................................................................................................................................7
Flushing and Water Treatment ...............................................................................................................7
System Controls ......................................................................................................................................7
Contents
STATUTORY REQUIREMENTS
The installation of this appliance must be carried out by a CORGI Registered person or other competent person and in
accordance with the requirements of the Gas Safety (Installation and Use) Regulations and the rules in force.
In GB it is necessary to comply with the Water Supply (Water Fittings) Regulation 1999, for Scotland, The Water Bylaws 2000,
Scotland. The Centora Green is an approved product under the Water Regulations.
To comply with the Water Regulations, your attention is drawn to The Water Regulations guide published by the the Water
Regulations Advisory Scheme (WRAS) gives full details of the requirements. In IE the requirements given under the current
edition of I.S.813 must be followed. installation must also comply with the current bylaws of Local Water Undertakings.
Installation should also be carried out in accordance with Building Regulations, Local Authority Building Standards (Scotland)
Regulations and current editions of the following British Standards Codes of practice: BS 7593, BS 5440 parts 1 and 2, BS
5449, BS 7593, BS 6798, BS 5546, BS 7074, BS 7671 and document IGE/UP/7.
In the Republic the Republic of Ireland the installation should be carried out in accordance with the following codes of practice:
I.S.813 Domestic Gas Installation, the following BS Standards give valuable information: BS 5546, BS 5449, BS 7074 and BS
7593.
The electrical connections must be made in accordance for GB with current I.EE. Wiring Regulations, in Scotland with the
electrical provisions of the Building Regulations applicable in Scotland, the Safety Document 635 The Electricity at Work
Regulation and in the Republic of Ireland in accordance with I.S.813 and the current ETCI rules.
The Centora Green does not contain any asbestos or asbestos products, or mercury derivatives. Additional CFC’s have not
been used in this product.
The appliance does not contain any potential hazard in relation to the COSHH regulations.
If there is a possibility of the incoming mains water pressure exceeding 10 bar then a suitable pressure limiting valve must be
fitted where pressures exceed 6 bars a pressure limiting valve is preferred.
Precautions: During servicing, keep the dust generation to a minimum and avoid inhaling any dust and contact with the skin
and eyes. Normal handling and use will not present any discomfort, although some people with a history of skin complaints
may be susceptible to irritation. When disposing of the ceramic lining, ensure that it is securely wrapped and wash hands after
contact.

4
5 INSTALLING THE BOILER ...............................................................................................................................8
Method of positioning the boiler on th wall...............................................................................................8
Connecting the boiler to the system.........................................................................................................8
Safety valve and condensats drains ........................................................................................................8
Fitting the horizontal flue .........................................................................................................................8
6ELECTRICAL CONNECTIONS ....................................................................................................................10
Making the Electrical Connections ........................................................................................................10
7COMMISSIONING AND TESTING................................................................................................................10
Pre-commissioning ................................................................................................................................10
DHW ......................................................................................................................................................10
Central Heating .....................................................................................................................................10
Lighting the boiler...................................................................................................................................10
By pass and pump .................................................................................................................................11
Post Commissioning ..............................................................................................................................11
Handing over to the Householder .......................................................................................................11
8FITTING THE CASING ..................................................................................................................................11
9ADJUSTEMENTS AND SETTINGS ..............................................................................................................12
10 INCORRECT FUNCTION .............................................................................................................................17
11 GAS CONVERSION .....................................................................................................................................17
USER’S INSTRUCTIONS Page
12- CONTROL PANEL ......................................................................................................................................18
13- HOW TO USE ..............................................................................................................................................19
Switching on ........................................................................................................................................19
Switching on Central heating ................................................................................................................19
Switching on the Domestic Hot water ...................................................................................................19
Switching on the Domestic Hot water and Central Heating together ....................................................19
Stand by mode ......................................................................................................................................20
Turn off the boiler ..................................................................................................................................20
14 MAINTENANCE ............................................................................................................................................20
15 GUARANTEE ................................................................................................................................................20
16 PRACTICAL INFORMATION ........................................................................................................................20
17 GAS CONVERSION .....................................................................................................................................21
18 INCORRECT FUNCTION .............................................................................................................................21
19 TECHNICAL DATA .......................................................................................................................................22
This instruction booklet is especially designed for appliances installed in the The United Kingdom and The
Republic of Ireland
INTRODUCTION
The CENTORA GREEN is a fully automatic, wall mounted, low water content condensing combination boiler. It is a
room sealed, fan assisted, balanced flued appliance providing central heating and mains pressure domestic hot
water on demand. It has electronic ignition and is suitable for all modern electrical control systems. The boiler is
designed for sealed systems only and a circulating pump, expansion vessel together with a pressure gauge and
safety valve are included within the boiler.
The standard horizontal flue kit is suitable for lengths 300 mm minimum to 600 mm maximum and includes an
elbow adapter that can be rotated through 360 ° . The horizontal flue can extend up to 3 metres using 1 metre
flue extension kits. 45 ° and 90° flue bends are also available as accessories.

5
1.- Steel chassis complete with expansion vessel
2.- Sealed chamber
3.- Burner and heat exchanger assembly
4.- Air / gas connection
5.- 24 V modulating fan
6.- Gas valve
7.- Ignition electrode
8.- Ionisation probe
9.- Ignitor
10.- Combustion products manifold
11.- 24 V transformer
12.- Siphon
13.- Electrical box
14.- Pump
15.- Secondary heat exchanger
16.- Pressure gauge
17.- Three way valve
18.- Automatic air separator and automatic vent
19 - Central heating flowswitch
20.- Domestic hot water flowswitch
21.- Central heating control thermistor
22.- Hot water control thermistor
23.- Overheat sensor
42 - Silencer
1
2
3
4
5
6
8
11
12
13
14
35
30 24 26 27
25
34
28
1
INSTALLER’S INSTRUCTIONS
7
Fig. 1
Fig 3
15
20
21
10
17
9
Fig. 2
33 36
3132
19
18
22
23
16
29
24.- Display
25.- Domestic Hot water switch
26.- Green indicator – Domestic Hot Water mode ON
27.- D.H.W. temperature reducing key
28.- D.H.W. temperature increasing key DHW mode
indicator
29.- Central Heating switch
30.- Green indicator – Central Heating mode ON
31.- Central Heating temperature reducing key
32.- Central Heating temperature increasing key
33.- Green indicator – Power ON
34.- Orange indicator - Burner ON
35.- Red indicator - Lock out / flame failure
36.- Reset key
42
Description

6
0
4
3
2
1
5
6
100 200 800 700
600
500
400
300 900 10001100 l/h
mCE Débit mini (robinets thermostatiques fermés)
Hauteur manométrique
GVF
GVO
PVF
PVO
20 40 60 80 100 120
Pf
140 160 180 200 220 240
0,7
0,8
0,9
1,0
1,1
1,2
1,3
1,4
1,5
1,6
1,7
1,8
1,9
2,0
Capacité maximale de l'installation (en litres)
80°C
70°C
60°C
50°C
40°C
260
Pression à froid pour le circuit chauffage (en bar)
C liter
2
3
Fig. 5
Fig. 6
440
450 mini pour entretien
With packaging :
24 : 43 kg
30 : 45,5 kg
54 54 54 54
JKLMN I
88
JK
L
MN
232
235
32
Safety valve
center line
All dimensions in mm
Fig. 4
Pump head chart available at the outlet of the boiler
System capacity chart
The boiler comprises a double speed pump and an
adjustable by-pass.
The chart (fig. 5) shows the pump head available regarding
the flow rate. GVF means high speed by-pass closed, PVF
means low speed by-pass closed, GVO means high speed
by-pass fully open, PVO means low speed by-pass fully
open.
For adjustment procedure, please refer to § 8.
The minimum flow rate to insure a correct functioning of the
should be over 300 l/h (with thermostatic valves fully
closed)
Maximum water capacity of Central Heating system :
The expansion vessel is pre-charged to 0.7 bar (10 lb/in 2 ).
The vessel is suitable for systems up to 145 litres capacity.
For systems of greater capacity an additional expansion
vessel will be required. Refer to the chart below and BS
7074 pt 1 or BS 5449.
The minimum initial pressure of the system should be over
0.7 bar (1 to 1.5 bar is recommended).
ISafety valve C/H and condensate
J Heating flow
K D.H.W. flow
L Gas supply
M Cold water inlet
N Heating return
minimum space required 450
Pump head available
Minimum flow rate (with all heating thermostatic valves closed)
Central heating initial pressure when cold (in bar)
Outer case dimensions :
-Width : 440 (minimum space required 450)
-Height : 850
- Depth : 380
Minimum clearances :
- Both sides 5 mm
- Above casing 170 mm
- Below casing 200 mm
- Front ( for servicing) 500 mm
- Front (in operation) 5 mm
212
360
67
737
850
24 : 380
50
Ø 100
Type C 12
206
143
Ø 125
Ø 80 120 Ø 80
Type C 32 xx Type C 32 xy
250
Ø 80
250
Ø 100
Type C 12
206
143
Ø 125
Ø80 120 Ø 80
Type C 32 xx Type C 32 xy
250
Ø 80
250
Type C 13 Type C 33
Ø100
Type C 12
206
143
Ø125
Ø 80 120 Ø 80
Type C 32 xx Type C 32 xy
250
Ø 80
250
Type C 53
The boiler is suitable
for the flue types:
• type C 13
• type C 33
• type C 53
170
225
30 : 405
Dimensions
Hydraulic Data

7
4
Location
The boiler can be installed on any suitable internal wall.
Provision must be made to allow the correct routing of the flue
and siting of the terminal to allow the safe and efficient
removal of the flue products. A compartment or cupboard may
be used provided that it has been purpose-built or modified for
the purpose. It is not necessary to provide permanent
ventilation for cooling purposes. Detailed recommendations
are given in BS 5440 pt 2. If it is proposed that it is installed in
a timber framed building then reference must be made to
British Gas Document DM2, or advice sought from CORGI.
Avoid to install the boiler where the air inlet can be polluted
by chemical products such as chlorine (swimming pool aera),
or ammonia (hair dresser), or alcalin products (launderette)
Flue
Detailed information on flue assembly is contained in the
appropriate starter pack.
The boiler must be installed so that the flue terminal is
exposed to the free passage of external air at all times. It must
not be allowed to discharge into another room or space such
as an outhouse or closed lean-to. The minimum acceptable
clearances are shown below:
- A Directly below an opening, window, etc 300 mm
- B Above an opening, window, etc 300 mm
- C Horizontally to an opening, window, etc 300 mm
- D Below gutters, soils pipes or drain pipes 75 mm
- E Below eaves 200 mm
- F Below balconies or car port roof 200 mm
- G From a vertical drain pipe or soil pipe 150 mm
- H From an internal or external corner 300 mm
- I Above ground roof or balcony level 300 mm
- J From a surface facing the terminal 600 mm
- K From a terminal facing the terminal 1200 mm
- L From an opening in the car port into the dwelling 1200 mm
- M Vertically from a terminal on the same wall 1500 mm
- N Horizontally from a terminal on the same wall 300 mm
- Q Fixed by Ubbink Rolux 4 GM flue terminal
It may be necessary to protect the terminal with a
guard. Reference should be made to the Building
Regulations for guidance. Suitable guards may be
obtained from the following manufacturer:
Quinnel Barret & Quinnel Wireworks
Old Kent Road
London SE15 1NL
Tel: [phone]
Ventilation
The room in which the boiler is installed does not require specific
ventilation. If it is installed in a cupboard or compartment
permanent ventilation is not required for cooling purposes.
Gas Supply
The gas installation and soundness testing must be in
accordance with the requirements of BS 6891.The boiler
requires a 22 mm supply. Ensure that the pipe size is
adequate for demand including other gas appliances on the
same supply.
Combustion system protection
The sulphur level contained in the gas should comply with
the européan Standards which are :
- maximum 150 mg/m3 for a short period in a year
- average level of 30 mg/m3 during one year
Electrical Supply
The appliance requires an earthed 230V - 50 Hz supply and
must be in accordance with current I.E.E. It must also be
possible to be able to completely isolate the appliance
electrically. Connection should be via a 3 amp fused double-
pole isolating switch with contact separation of at least 3 mm
on both poles. Alternatively, a fused 3 Amp. 3 pin plug and
unswitched socket may be used, provided it is not used in a
room containing a bath or shower. It should only supply the
appliance.
The boiler is suitable for sealed systems only. The maximum
working pressure for the appliance is 10 bar. All fittings and
pipework connected to the appliance should be of the same
standard. If there is a possibility of the incoming mains
pressure exceeding 10 bar, particularly at night, then a
suitable pressure limiting valve must be fitted.
The boiler is designed to provide hot water on demand to
multiple outlets within the property. If there is a requirement
for greater demands, for example if the property has several
bathrooms and cloakrooms, a vented or unvented hot water
storage system may be used.
Showers
Any shower valves used with the appliance should be of a
thermostatic or pressure balanced type. Refer to the shower
manufacturer for performance guidance and suitability.
Flushing and Water Treatment
The performance of the appliance could be impaired by
system debris or the effects of corrosion. The system must
be flushed thoroughly to remove metal filings, solder,
machining oils and other fluxes and greases before
connecting the boiler. If it is an existing system, an
appropriate flushing and descaling agent should be used.
Refer to BS 7593 (1992) for guidance. For more information
on the use of corrosion inhibitors, flushing and descaling
agents, advice can be sought from the manufacturers of
water treatment products such as:
Betz Dearborn Ltd
Foundry Lane
Widnes
Cheshire
WA8 8UD
Tel: [phone]
Fernox Manufacturing
Britannica Works
Clavering
Essex
CB11 4QZ
Tel: [phone]
System Controls
The boiler is electrically controlled and is suitable for most
modern electronic time and temperature controls. The
addition of such external controls can be beneficial to the
efficient operation of the system. The boiler connections for
external controls are 24V and so only controls of 24V or that
have voltage free contacts should be used.
Fig. 7
A
B
GH
JC
LMN
K
ID,E
F
Q
H
N
M
Q
Q
I
Installation Requirements

8
5
Please check that you are familiar with the installation requirements before commencing work.(section 6)
The installation accessories described in the following list are included in the boiler packaging.
-Hanging bracket
- A paper template (showing the dimensions of the boiler with 5 mm side clearances, fitting instructions and commissioning
instructions)
-Connection tails
- Screws and wall plugs
- Connection washers and filters
- Installation manual
Method of positioning the boiler on the wall.
The paper template can be used to ensure the correct positioning of kitchen cabinets etc. It also details the commissioning
instructions.
The paper template has to be fixed to the wall and used to locate the position of the hanging bracket and the centre for the flue
hole.
Drill and plug the wall and secure the hanging bracket using the screws provided. Remove the boiler from its packaging as
shown in fig. 8 and unscrew the 4 screws Aand remove the casing (Fig. 9).
Place the boiler on the wall on the hanging bracket (Fig. 11).
If required, there is space for all piping to pass behind the boiler. Using fig. 11 for reference, connect the gas and water pipes
and the valves to the base of the appliance using the tails provided. There is a 190 mm space between the valves and the wall
to make these connections.
Connecting the boiler to the system
- Push in the tabs “P” (fig. 13) on either side of the boiler and pivot the electrical box forward to gain access to the valve
connections
- Remove the yellow caps and connect the boiler to the taps using washers provided in the plastic bag.
4 x fibre washers for the C/H flow and return, hot water outlet and cold water inlet connections
1 x rubber washer “R” for gas connection.
Provision must be made to fill and recharge the system pressure. This can be achieved using a filling loop or other methods
approved by the local water authority.
Before fitting the tails onto the connecting bracket, please check the correct location of the flow restrictor L(fig.10) on the main
inlet.
Safety valve and condensate drains
The pressure relief valve tube is clear silicone. It should terminate below the boiler over a tundish or 22 mm pipe (see Ifig 4)
which should in turn discharge safely outside the premises. Care should be taken that it does not terminate over an entrance
or window or where a discharge of heated water could endanger occupants or passers by.
The system should be carefully checked for leaks, as frequent refilling could cause premature system corrosion or
unnecessary scaling of the heat exchanger. The pipe from the siphon 12 (fig. 1) should be connected to a drain is the
conditions described in the relevant Brittish regulations.
External termination via condensate siphon
The condensate drainage pipe should have a minimum diameter of 22 mm, it should be inserted into a suitable acid resitant
pipe - e.g. plastic waste or overflow pipe (refer to BS 6798 : 2000) by at least 50mm, must have a continuous fall and
preferably be installed and terminated within the building.
Pay special attention to not bend the condensates silicone drain pipe such as the flow will be interrupted.
The discharge pipe must terminate in a suitable position:
i) Connecting to an internal soil stack (at least 450mm above the invert of the stack). A trap giving a water seal of at least
75mm must be incorporated into the pipe run, there must also be an air break upstream of the trap.
ii) Connecting into the waste system of the building, such as a washing machine or sink. The connection should be upstream
of the washing machine / sink (if the connection is down stream of the waste trap then an additional trap giving a minimum
water seal of 75mm and an air break must be incorporated in the pipe run as above.
iii) Terminating into a gully below the grid level but above the water level.
iv) Into a soakaway.
NOTE:IF ANY CONDENSATE PIPEWORK IS TO BE INSTALLTED EXTERNALLY, THEN IT SHOULD BE KEPT TO A MINIMUM AND BE INSULATED WITH
AWATERPROOF INSULATION AND HAVE A CONTINUOUS FALL
The condensate flow can reach 2 litres/hour; because of the acidity of the condensate products (Ph close to 2), take care
before operation.
Fitting the Horizontal Flue
Attention ! Before starting the boiler, the siphon 12 fig. 1 must be filled with water. Before fitting the flue terminal onto
the boiler, please poor 1/4 litre of water in the exhaust pipe as shown in fig. 12.
The instructions for the vertical and biflux (twin pipe) flue options are included with the relevant adapter kits.
The standard flue supplied with the appliance is suitable for lengths from 300 mm minimum to 720 mm maximum.
Installing the Boiler

9
5
A
Fig.11
AAA
Fig. 9
Fig. 10
L
Fig. 8
Fig.12
Installing the Boiler (continued)
This means for rear flueing, the standard kit will accommodate a maximum wall thickness of 600 mm, and for side flueing a
maximum wall thickness of 587 mm. This takes into account the minimum appliance side clearances of 5 mm.
If the flue is a side exit installation, then calculate the position of the hole with a slope of 5 mm / metre towards
the boiler from the terminal. The flue should rise up slightly to the terminal in order to let the condensate coming back into the
boiler.
Attention ! Use only specific condensation flue kit.

10
Making the Electrical Connections
Hinge down the electrical box to gain access to the electrical connections. Push in the tabs P(fig 13) on either side of the
boiler and pivot the box forward. Undo the two retaining screws V, remove cover and remove cable clamp. C(fig 14)
Connect the live and neutral wires to the multipin plug leaving sufficient earth wire to connect to the earthing point Tfig 14 .
Note: The connections should be made so that should the lead be pulled from its anchorage, the current carrying wires
become taut before the earth wire.
If using a room thermostat or other external control, they can be connected in place of the link Son the multipin
Plug (see fig. 14).
Note: Use only controls designed for voltage free switching or 24V supply. Do not connect to a 230V supply.
Connect multipin plug into the socket on the printed circuit board. Secure the cable using the cable clamp and
replace the cover. NB The room thermostat options setting can be made before replacing the electrical box cover (1 fig.14).
All necessary settings for room thermostat operations are described in paragraph 9 ADJUSTEMENTS AND SETTINGS.
TR
COM
REP
8
M/A
VITESSE
1
1
1
1
1
1
BUS
1
CALYDRA
OFF ON
11
12
2
1.23
OFF ON
11
12 1
SW2
PROG
SW1
TA
1
T2A
1
MCD
1
230V
MOTEUR
RL6
R133
C28
T15
R36 R35
C80
C79
T16
R34
T12
T11
R107
R33
R130
R129
D43
U9
Z7A
R132
R16
R15
R14
C84
C83
R6a
Z4A
C78
RL13
C73
Z6
R7a
Z7
Z4
D46T10
T9
RL8
RL7A
RL7
RL10
RL2A
RL2
RL9
R119
R118
R113
R9
R8
R7
R6
R31
R32
R29
R27
R25
R24
R23
R19
R18
R17
R140
R137
TH4
R13
R12
R11
R115
C82
C81
T14
T13
R136
TH3
U11
R64
R10
R63
R59
R128
R112
J9
J6
J7
J4
J3
J2
J1
F1
D5
D31
D30
D32
D42
D41
D40
D35
D36A
D36
D17
D16
D15
D14
J11
C34
J5
C52
C51
C75
C74
C31
C38
C27
C26
C25
C1
J12
U12
+5V
J
T

S
J 1
Fig. 14
6
J
T
C
S
7
Pre-commissioning
Ensure that the system has been adequately flushed.
Purge gas supply of air and test for soundness.
Carry out final electrical tests to ensure the correct polarity and
earthing continuity.
DHW
Open the main cold feed valve 40.
Open all hot taps to purge DHW system.
Check for water soundness.
Check flow rate at the bath tap is set correctly (see technical data).
Central Heating
Open flow and return valves on the boiler 37 and 41 (Fig. 15)
Open the automatic air vent 18 (Fig. 2)
Fill system and vent radiators.
Set system pressure and remove filling loop.
Check for leaks.
Manually check pump is free to turn.
Switch on electrical supply.
Press the Central Heating switch 29 (Fig. 3) to switch on heating
mode.
Press the +key 32 (Fig. 3) to set heating temperature to maximum.
Allow pump to run for several minutes.
Isolate the electrical supply.
Drain boiler and check water filter for installation debris.
Replace filter and recharge system.
Lighting the Boiler
Inspect the entire gas supply for soudness, including the gas meter,
the gas installation should be in accordance wiith the relevant
standards, in GB this is BS 6891 and in IE this is the current edition
of I.S.813.
Connect gas pressure gauge to test point 39 (Fig. 15).
Turn on the gas supply and boiler gas tap 39 (Fig. 15).
Ensure electrical supply is on.
Ensure all external controls are calling for heat.
Press on Central Heating switch 29 (Fig. 3) to switch on heating
mode.
Press the +key 32 (Fig. 3) to set heating temperature to maximum.
The boiler will light. Allow the boiler to heat system.
Check the inlet gas pressure (working pressure) while boiler is
operating in hot water mode.(Refer to technicaldata).
Check the operation of the boiler controls and safety devices.(see
separate servicing leaflet for details).Set the by pass (refer to the
paragraph bellow).
Re-flush the system to remove any dissolved oils and fluxes.
Recharge system pressure and introduce any water treatment as
required.
P
V
P
Fig. 13
Electrical Connections
Commissioning and Testing

11
7
By pass and Pump
The boiler is fitted with a pre-adjusted by pass. Although
adjustment is not normally necessary, the by pass can be reset by
turning screw D(fig. 15 ) anticlockwise to open the by-pass using
the chart below for guidance. If used on a system with thermostatic
radiator valves, the flow rate with the thermostatic valves closed
should be adjusted to at least 300 l/hr. The enclosed charts indicate
the residual head of the pump available for the system. The pump
fitted on the boiler is a double speed model. (GV = High speed and
PV = low speed). The speed setting is described in chapter 9.
Speed selection is only available in C.H. mode.
Post Commissioning
Ensure system pressure has been set correctly.
Set all parameters of the boilers as shown in chapter 9
ADJUSTMENTS AND SETTINGS.
Set boiler thermostat and controls.
Set programmer to householder’s requirements.
Set external controls.
Ensure the Logbook is fully completed with your contact details and
required readings and details of the
installation.
Handing Over to the Householder
Demonstrate the lighting and operation of the boiler.
Demonstrate how to maintain the system pressure.
Demonstrate the operation and setting of the built-in clock.
Explain the benefits of annual maintenance by a competent person.
Explain how to register guarantee.
Ensure the Householder countersigns the Log Book to confirm that
these demonstrations have been carried out and understood.
For IE, it is necessary to complete a “Declaration of Conformity” to
indicate compliance to I.S.813. An example of this is given in the
current edition of I.S.813. An example of this is given in the curent
edition of I.S.813. in addition it is necessary to complete the
“Benchmark” Log Book.
TT
1
2
Fig. 17
Fitting the casing
Remove the protecting film from the casing :
- Position the casing as shown fig. 17
- Slide down the casing and put the casing holes on the plastic pins
located on the top of the chassis
- Control the correct position of the casing onto the boiler
- Tighten the 4 screws located at the bottom as shown in fig. 16.
8
AAAA
Fig.16
bar
0
13
4
Fig. 15
D
16
37 39 40 41
Commissioning and Testing (continued)
Fitting the Casing

12
The boiler is delivered with a pre setting values described in menus 3 and 4.
All settings can be changed by the installer or a qualified person. To gain access to the setting keys please, open the front
door P. (fig. 18)
DISPLAY
1 st digit 2 nd digit
3 rd digit
Menu key
Setting key
To gain access to setting menus press simultaneously on and keys on the D.H.W. side during 5 seconds. (fig. 18).
Menu 1 is displayed.
Changing the menu :
Press on Menu key ( key on C.H. side) (fig.18). The menu number is displayed for 3 seconds. Press on menu key to
change for the next menu.
Changing section in a menu (available only for menu 3 and 4 :
Press on or key of the DHW side to change from on section to the previous or the next on in a menu.
Note : When you arrive at the last section of a menu, pressing on + key will change for the the 1st section. When you are
at the first section, pressing on – key will change for the last section of the menu.
Setting a parameter in a section:
Press on setting key ( key of the heating side) to enter in modification mode. The 2nd and 3rd digits are flashing Press
on or on DHW side to select the correct value then press on Setting key to valid this
modification and to get out from setting mode. The 2nd and 3rd digit stop flashing.
Recalling the basic configuration:
Select menu 3or 4then press together on key DHW side and setting key for more than 5 seconds. The digits will flash
CM for a while to indicate that the operation is completed.
Erasing the default register :
Select menu 1then press together on + key DHW side and setting key for more than 5 seconds. The digits will flash
CM for a while to indicate that the operation is completed.
Note : To exit from setting mode, leave the boiler for approx. 1 minute then the computer will switch back to user mode.
DISPLAY
Fig. 18
P
D.H.W keys
C.H keys
9Adjustments and Settings

13
5 ” Menu - 1 - Default register
Record the last 10 defaults
Section Digit 1 Digit 2 and 3
Last default occured 0•code from 01 to 99
Last but one default occurred 1•code from 01to 99
... ... code from 01 to 99
Last default occurred before the previous one 9•code from 01 to 99
Menu - 2 - Boiler conditions
Indicates the conditions or the configurations of the boiler
Section Digit 1 Digit 2 and 3
Software version of display PCB 0•10 to 99
Flue type 2•1: FF
variable speed
Room thermostat is calling for heat 3•0: no
3•1: yes
Theoretical position of the 3 way valve 4•0: DHW
4•1: CH
DHW flow temperature in Celsius degrees 5•from 00 to 99
CH flow temperature in Celsius degrees 7•from 00 to 99
Software version of main PCB 9•10 to 99
DISPLAY
ACTION CONFIGURATION
once
x times
x times
Note -- is displayed if no default is recorded.

14
Menu - 3 - Boiler options
DISPLAY
ACTION CONFIGURATION
Section Digit Digit
1 2 et 3
Under floor heating system 0 0: no
1: yes
Celectic 4 0: no
1: yes
DHW Delay 5 0 to 5 mn by step 0.5mn
(time before CH relight after a DHW cycle)
DHW flow swith Delay 6 0 to 20 1/10 seconde
(time before DHW flow detection to
override pressure peak problem)
Factory
setting
Menu - 4 - Boiler settings
Section Digit Digit
1 2 and 3
Room thermostat operation 0 0: Burner only
01: Burner and pump
Pump speed 1 0: High speed
11: Low speed
Pump post circulation duration 2 0,0 min
From 0 to 5 minutes by step of 0.5 min. 2 0,5 min
21,0 min
25,0 min
Maximum Central Heating flow temperature 4 50°C
480°C
CH anti cycling delay 8 0,0 min
From 0 to 7 minutes by step of 0.5 min. 80,5 min
82,5 min
85,0 min
CH maximum output limitation
Model 24
From step 0 (P. min.) 8 kW Value from
to step 10 (P. max.) 24 kW 90 to 10
Model 30
From step 0 (P. min.) 9 kW 9 Value from
to step 10 (P. max.) 28 kW 0 to 10
Factory
setting
DISPLAY
ACTION CONFIGURATION
once
x times
once
x times

15
Menu - 5 - Combustion rate control mode
X X
X X
DISPLAY
ACTION CONFIGURATION
wait 5 ” Combustion rate control mode OFF
Switching on the combustion rate
control mode. Central heating output
reach the maximum power set in
menu 4 section 9.
Central heating temperature is
displayed in celsius degrees.
The 3 dots indicate that the
combustion rate control is ON at
maximum output.
Switching the combustion rate
down to minimum power.
Central heating temperature is
displayed in celsius degrees.
The dot indicates that the
combustion rate control is ON at
minimum output.
Switching on the combustion rate to
maximum output set in menu 4
section 9.
Central heating temperature is
displayed in celsius degrees.
The 3 dots indicate that the
combustion rate control is ON at
maximum output.
X X
Switching off the combustion rate
control mode.
press once
press once
press once
press once
Effect Display
Locking conditions of the combustion rate control mode :
- boiler in stand by mode
- D.H.W. draw off
- room thermostat is not calling for heat
- room thermostat is calling for heat but the maximum temperature is reached
- boiler in lockout mode
- after a reset or if the main supply fails
- end of the mode if operator leave menu 5
- after 15 minutes if there is no actions on keyboard
Note : As soon as the combustion rate control mode is on, Central Heating and Domestic Hot Water keys are
inactive.
press once

16
CH heat output setting :
If you would like to change the setting of C/H heat output, please proceed as follow :
(note : the factory setting is 18 kW and the following explanation refer to menu 4 section 9)
- Switch to installer mode, press key
and on DHW side for 5
seconds.
The display shows :
-1- then 0•-- if there is no default in the
default register.
- press 3 times on menu key (on
CH side ) to gain access to menu -4-,
The display shows :
-4- then the value set for section 0 ( 00
or 01 respectively Action on burner only
or pump and burner)
- change for section 9 (Adjustment of
CH heat output). Press on key on
DHW side times.
The display shows :
(906 which corresponds to the 18 kW
which is the factory setting for Centora
green 24)
9= section 9 06 = 18 kW
- press on setting key (on CH
side)one time, the 2nd and 3rd digits
flash together. Then press on or
key on DHW side to
change the C/H heat output step
between 00 and 10.
Press on setting key to confirm the
value. The display stops flashing.
Setting procedure is finished.
To exit from setting mode, leave the
boiler for approx. 1 minute then the
computer will switch back to user
mode.
After programming please close the
door P(fig. 18)
1
Display
2x 3
1
2
or
33x 9
44
5 ”
9Adjustments and Settings (continued)

17
10
In case of problem, or when the boiler has to display a message, the display flashes 2 digits. Please refer to the table bellow
to diagnose the default.
For default 01 and 03, the red indicator 35is alight (fig.19)
35
Fig. 19
Overheating lock out
FAULT
Code
display Fault description Information on functioning
01 Overheating lock out
03 No flame detection
05 Anti freezing system, pump on
06 Anti freezing system, pump and burner on
07 No water circulation in primary circuit
08 No water in the primary circuit
09 Domestic Hot Water thermistor faulty (open circuit)
10 Domestic Hot Water thermistor faulty (short circuit)
11 Central Heating thermistor faulty (open circuit)
12 Central Heating thermistor faulty (open circuit)
18 Attempt to re light
20 Wiring problem
23 Fan speed too low
24 Fan control system defective
29 Three way valve blocked in CH mode
31 Communication problem with the display PCB
32 Communication problem with the main PCB
If the boiler is not set for the gas type, conversion kits are available. To convert the boiler, please use exclusively Chaffoteaux
& Maury parts and proceed as mentioned in the instruction manual provided with the conversion kit, the gas conversion must
be carried out by a CORGI registered engineer.
11
Incorrect Function
Gas Conversion

18
USER’S INSTRUCTIONS
Control panel (fig. 20)
16.- Pressure gauge
24.- Display Domestic hot water temperature adjustment
25.- Switch for Domestic Hot Water mode
26.- Green indicator Heating Domestic Hot Water mode ON
27.- Key to reduce the Domestic Hot water temperature
28.- Key to rise up the Domestic Hot water temperature
29.- Switch for Central Heating mode
30.- Green indicator Central Heating mode
31.- Key to reduce the Central Heating temperature
32.- Key to rise up the Central Heating temperature
33.- Green indicator - Power ON
34.- Orange indicator - Burner ON
35.- Red indicator - Lock out / flame failure
36.- Reset button
12
Connecting bracket Taps shown in Open position
(fig. 21)
37 : Central heating flow isolating valve
38 : Domestic Hot Water outlet
39 : Gas service tap
40 : Water service tap
41 : Central heating return isolating valve
43 : Central heating pressure relief valve
45 : D.H.W. drain screw
16
24
27
26 25
29 28
30
31
32
3435
36
33
Fig. 20
STOP
+
+
+ +
Fig. 21
37 41
40
39 43
38
45
Control Panel

19
Switching on
1. Check that pressure in central heating system is above 0.7 bar and below 1.5 bar with the pressure gauge 16.
2. Check that the gas service tap is opened at the gasmeter and main power is on. Green indicator Power ON
33.
3. Open the gas tap 39 (fig.21).
The boiler is now ready to use.
Attention ! If the boiler stays a long time without working, some air in the gas pipe can hinder the first lightings. (please refer
to paragraph 18 Incorrect Function)
Switching on Central heating
Press on key 29 , the green indicator 30 will light and the display will show the Heating
flow temperature.
Keys 31 and 32 allow to adjust the temperature required in the Central Heating
system regarding the weather conditions.
• press to increase temperature when weather is cold
• press to reduce temperature when weather is fair
During the temperature setting operation the display will flash.
If the room thermostat is calling for heat, a dot will be displayed at the bottom of the 3rd digit
Switching on the Domestic Hot water
Press on key 25 , the green indicator 26 will light :
If there is no water demand
the display will show the following graphic
In case of draw off
a square made of 4 digits will move clockwise on the display
Keys 27 and 28 allow to adjust the temperature required for the Domestic Hot Water flow. During the temperature
setting operation the display will flash.
Note : The configuration of CH system can generate some gravity effect when the boiler is set in DHW mode only. It may
result a temperature rise of the heating pipes close to the boiler (or eventually a radiator). To avoid that, it is possible to close
during summer period (Central Heating switched off) the heating flow isolating tap (37 fig. 21). Don’t forget to open it when you
will switch on the Central Heating mode again.
13
Switching on the Domestic Hot water and Central Heatingh together
Press on key 29 the green indicator 30 will light.
Press on key 25 the green indicator 26 will light.
If there is no water demand the display will show the heating flow temperature
In case of draw off a square made of 4 digits will move clockwise on the display
How to Use

20
As with your car, your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service
check. The service history of the appliance will be marked on the logbook.
14
Turn off the boiler
- Press on key 29 and 25 , to switch off both DHW and CH mode. The green indicators 30 and 26 will stop
- Switch off the main electrical supply
- Shut off the gas service tap 39 (fig. 21)
Note : In this conditions, the anti-freeze system is inoperative
Stand by mode A fixed digit at the centre of the display and the green indicator 33 on
Putting the boiler in stand by mode and anti freeze system. :
Press on key 29 and 25 ,to switch off both DHW and CH mode. The green indicators 30 and 26 will stop.
During the all duration of the stand by mode, an automatic anti-sticking system will switch on the pump for 1
minute and make a movement of the 3 way valve each 23 hours.
The stand by mode will disable the anti-freeze function of the room thermostat (if fitted). To leave the room
thermostat anti freeze system operative, please let the Central Heating mode on.
The boiler is equipped with an automatic anti freeze system which permanently on.
If the Central Heating temperature decrease bellow 7°C, the pump will start.
If the Central Heating temperature decrease bellow 4°C, the pump and the burner will start.
13
15
16
Pump anti-sticking device
When the boiler is switched on, an automatic anti-sticking system will switch on the pump for 1 minute and make a movement
of the 3 way valve each 23 hours. This is a normal functioning.
Precaution to avoid freezing
We recommend you contact your installer or local service centre to take precautions adapted to your system.
• DHW system
Turn off the main cold water supply and drain the boiler :
- Open a hot water tap
- Unscrew the cold water inlet tail
- Pour the water out the boiler with the screw 45 (fig. 21)
• CH system
Chose one of the following solution :
- 1) Drain completely the Central Heating system
- 2) Protect the Central Heating system with anti freeze chemical products and verify periodically the concentration
- 3) Let the Heating mode switched on and set the room thermostat to anti-freeze mode (between 5 and 10°C)
- 4) Let your boiler in stand by mode, the anti-freeze device will switch on the pump and the burner if necessary.
How to Use (continued)
Maintenance
Guarantee
Practical Information
The manufacturer`s guarantee is for 12 months from the date of purchase. The guarantee is voidable if the appliance is not
installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist us
in providing you with an efficient after sales service, please return the guarantee registration card enclosed with the boiler with-
out delay.