Chaffoteaux & Maury Centora green 18 User manual

CONDENSING WALL-HUNG COMBINATION BOILER
Central Heating and Instantaneous Domestic Hot Water - Fanned Flue system
Installation and Operating
Instructions
C
Centora green 18-24
G.C.N: 47-980-21
PLEASE LEAVE THESE INSTRUCTIONS
WITH THE END-USER

2
These instructions are suitable for ‘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 End User
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 a 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 in 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.
A charge may be made if Chaffoteaux & Maury Service is called out to resolve a non-product related fault.
Your statutory rights are not affected.
CUSTOMER CARE
Chaffoteaux & Maury, 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 243 0224.
Advice on installation or servicing can also be obtained by contacting the C&M Services Department at Telford.
CUSTOMER SERVICES DEPARTMENT
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.
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.
In addition, the installation must also comply with the current Water Regulations, Water Byelaws Building Regulations, IEE
Wiring Regulations, Local Authority Building Standards (Scotland) Regulations and the Safety Document 635 The Electricity at
work Regulation. The appliance named below 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.
It should also be carried out in accordance with current editions of the following British Standards Codes of practice: BS 6891,
BS 5440 parts 1 and 2, BS 5449 part 1, BS 7593, BS 6798, BS 5546, BS 4814, BS 7074 part 1 and 2, BS 7671 and BG DM2.
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 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.
TO CONTACT C&M SERVICE, PLEASE CALL THE NATIONAL WARRANTY HELPLINE ON:
0870 243 0224
To The Installer
As part of the commissioning of this appliance it is vital that the Log Book is completed and given to the End User. 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
Contents
CUSTOMER CARE Page
Guarantee ............................................................................................................................................................2
Statutory Requirements .......................................................................................................................................2
Contents ...............................................................................................................................................................3
INTRODUCTION ..................................................................................................................................................4
INSTALLATION INSTRUCTIONS........................................................................................................................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
5 INSTALLING THE BOILER .............................................................................................................................8
Method of Positioning the Boiler On the Wall ..........................................................................................8
Connecting the Boiler to the System........................................................................................................8
Safety Valve and Condensate Drains......................................................................................................8
Fitting the Horizontal Flue .......................................................................................................................8
6 ELECTRICAL CONNECTIONS ....................................................................................................................10
Making the Electrical Connections ........................................................................................................10
7COMMISSIONING AND TESTING................................................................................................................10
Pre-Commissioning................................................................................................................................10
D.H.W. ...................................................................................................................................................10
Central Heating .....................................................................................................................................10
Lighting the Boiler ..................................................................................................................................10
By-pass and Pump.................................................................................................................................11
Post Commissioning ..............................................................................................................................11
Handing Over to the End User ............................................................................................................11
8FITTING THE CASING ..................................................................................................................................11
9ADJUSTMENTS AND SETTINGS ................................................................................................................12
10 INCORRECT OPERATION............................................................................................................................17
11 GAS CONVERSION .....................................................................................................................................17

4
USER INSTRUCTIONS Page
12- CONTROL PANEL ......................................................................................................................................18
13- HOW TO USE ..............................................................................................................................................19
Switching On ........................................................................................................................................19
Switching On the 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 OPERATION ...........................................................................................................................21
19 TECHNICAL DATA .......................................................................................................................................22
This instruction booklet is specifically designed for appliances installed in the United Kingdom
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. A circulating pump, expansion vessel, 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 be extended 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 trap
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 flow switch
20 - Domestic hot water flow switch
21 - Central heating control thermistor
22 - Hot water control thermistor
23 - Overheat sensor
1
2
3
4
5
6
8
11
12
13
14
35
30 24 26 27
25
34
28
1Description
INSTALLATION 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 D.H.W. 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

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
80°C
70°C
60°C
50°C
40°C
260
Pression àfroid pour le circuit chauffage (en bar)
l3
2Dimensions
3Hydraulic Data
Fig. 5
Fig. 6
450
500 min for servicing
With packaging : 43 kg
fl105
Type C12, C42 or C22
155
54 54 54 54
JKLMN I
88
JK
L
MN
232
235
32
Safety valve
center line
All dimensions in mm
Fig. 4
Type C 13 ou C 42
Pump head chart measured 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 relating to
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 section 9.
The minimum flow rate to ensure the correct function of the
pump, should be over 300 l/h (with all heating 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
JCentral Heating flow
K D.H.W. outlet
L Gas supply
M Cold water inlet
NCentral Heating return
Pump head available
Minimum flow rate (with all heating thermostatic valves closed)
Central heating initial pressure when cold (in bar)
157 177
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
380
50

7
4Installation Requirements
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 installing the boiler where the air inlet can be polluted
by chemical products such as chlorine (swimming pool aera),
or ammonia (hair dresser), or alcaline 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 european 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. Regulations. 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 a 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

8
5Installing the Boiler
Please check that you are familiar with the installation requirements before commencing work.(section 4)
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 the 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.
External termination via condensate siphon
The condensate drainage pipe should have a minimum diameter of 22 mm and the external pipe length should not be more
than 3m. The external length should be kept as short as possible to minimize the effect of freezing.
Please refer to BS 6798:2000
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 as described
in the relevant Brittish regulations.
Pay a special attention to not bend the condensate drain pipe as the flow will be interrupted. Please use exclusively drain pipe
material compatible with condensate products. (refer to BS 6798:2000)
The condensate flow can reach 2 l/hr; because of the acidity of the condensate products (Approx. Ph2), 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 pour 1/4 litre of water into 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.
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 allow the condensate back into the boiler.
Attention ! Use only a C&M condensation flue kit.

9
5Installing the Boiler (continued)
A
Fig.11
AAA
Fig. 9
Fig. 10
L
Fig. 8
Fig.12

10
Making the Electrical Connections
Lower 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 the cover and remove the cable clamp. C(Fig. 14)
Connect the live and neutral wires to the multipin plug J1 (Fig. 14) leaving sufficient earth wire to connect to the earthing point
T(Fig. 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 S (Fig. 14) on the multipin
Plug.
Note: Use only controls designed for voltage free switching or 24V supply. Do not connect to a 230V supply.
Connect the 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 Section 9 ADJUSTMENTS 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
6Electrical Connections
J
T
C
S
7Commissioning and Testing
Pre-commissioning
Ensure that the system has been adequately flushed.
Purge the gas supply of air and test for soundness.
Carry out final electrical tests to ensure the correct polarity and
earthing continuity.
D.H.W.
Open the main cold feed valve 40 (Fig. 15).
Open all hot taps to purge the D.H.W. system.
Check for water soundness.
Check the flow rate at the bath tap is set correctly (see technical
data).
Central Heating
Open the flow and return valves on the boiler 37 and 41 (Fig. 15)
Open the automatic air vent 18 (Fig. 2)
Fill the system and vent the radiators.
Set the system pressure and remove the filling loop.
Check for leaks.
Manually check the pump is free to turn.
Switch on the electrical supply.
Press the Central Heating switch 29 (Fig. 3) to switch on the heating
mode. Press the ‘+’key 32 (Fig. 3) to set the heating temperature to
maximum.
Allow the pump to run for several minutes.
Isolate the electrical supply.
Drain the boiler and check the water filter for installation debris.
Replace the filter and recharge system.
Lighting the Boiler
Connect a gas pressure gauge to the test point 39 (Fig. 21).
Turn on the gas supply and boiler gas tap 39 (Fig. 21).
Ensure the electrical supply is on.
Ensure all external controls are calling for heat.
Press the Central Heating switch 29 (Fig. 3) to switch on the heating
mode.
Press the ‘+’key 32 (Fig. 3) to set heating temperature to
maximum.
The boiler will light. Allow the boiler to heat the system.
Check the inlet gas pressure (working pressure) while the boiler is
operating in D.H.W. mode. (Refer to technical data).
Check the operation of the boiler controls and safety devices. (see
the servicing leaflet for details). Set the by-pass (refer to the page
12).
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

11
7Commissioning and Testing (continued)
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
Section 9. Speed selection is only available in C.H. mode.
Post Commissioning
Ensure the system pressure has been set correctly.
Set all the parameters of the boilers as shown in Section 9
ADJUSTMENTS AND SETTINGS.
Set the boiler thermostat and controls.
Set the programmer to the requirements of the End User.
Set the external controls.
Ensure the Log Book is fully completed with your contact details
and all the required 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 the guarantee.
Ensure the End User countersigns the Log Book to confirm that
these demonstrations have been carried out and understood.
TT
1
2
Fig. 17
Fitting the casing
Remove the protective film from the casing :
- Position the casing as shown fig. 17
- Slide down the casing and locate the casing holes on the plastic pins
on top of the chassis
- Ensure the correct positioning of the casing onto the boiler
- Tighten the 4 screws located at the bottom as shown in Fiig. 16.
8Fitting the Casing
AAAA
Fig.16
bar
0
13
4
Fig. 15
D
16
37 39 40 41

12
The boiler is delivered with pre-set 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
1st digit 2nd digit
3rd digit
Menu key
Setting key
To gain access to the setting menus press both the and keys on the D.H.W. side for 5 seconds. (Fig. 18). Menu 1 is
displayed.
Changing the menu :
Press the key (C.H. side) (Fig.18). The menu number is displayed for 3 seconds. Press the + key (C.H. side) again to
show the next menu.
Changing section in a menu (available only for menus 3 and 4):
Press the or key (D.H.W. side) to change from one section to the next in a menu.
Note : When you arrive at the last section of a menu, pressing the key will change to the 1st section. When you are at
the first section, pressing the key will change to the last section of the menu.
Setting a parameter in a section:
Press the key (C.H. side) to enter the modification mode. The 2nd and 3rd digits will flash. Press the or key
(D.H.W. side) to select the correct value then press the key (C.H. side) to validate the modification and to exit the setting
mode. The 2nd and 3rd digits will stop flashing.
Recalling the basic configuration:
Select menu 3or 4then press the key (D.H.W. side) and the key (C.H. side) 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 both the key (D.H.W. side) and the key (C.H. side) for more than 5 seconds. The digits
will flash CM for a while to indicate that the operation is completed.
Note : To exit the setting mode, leave the boiler for approx. 1 minute, the computer will then 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
Records 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 01 to 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 P.C.B. 0•10 to 99
Nominal Power of the boiler (type 18 or 24 kW) 1•24
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: D.H.W.
4•1: C.H.
DHW flow temperature in oC5•from 00 to 99
CH flow temperature in oC7•from 00 to 99
Software version of main P.C.B. 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 and 3
Under floor heating system 0 0: no
1: yes
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
C.H. anti cycling delay 4 80°C
TAC 8 0,0 min
From 0 to 5 minutes by step of 0.5 min. 8 0,5 min
82,5 min
85,0 min
C.H. maximum output limitation Power
by step of 1 kW value
For a 24 kW model 9 8 to 18
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 reaches the maximum power
set in menu 4 section 9.
Central heating temperature is
displayed in oC.
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 oC.
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 oC.
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
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 the operator exits menu 5
- after 15 minutes if no keys are pressed.
Note : As soon as the combustion rate control mode is on, the Central Heating and Domestic Hot Water keys
will become inactive.

16
C.H. power output setting :
If you would like to change the setting of C.H. power output to 12 kW, please proceed as follows :
(Note: the factory setting is 18 kW and the following explanation refers to menu 4 section 9)
- Switch to installer mode, press the
and keys on the D.H.W. side
for 5 seconds.
The display shows :
-1- then 0•-- if there is no default in the
default register.
- press the key (C.H. side ) 3 times
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)
- Select section 9 (Adjustment of C.H.
heat output). Press the key
(D.H.W. side) 9 times.
The display shows :
918 (this corresponds to 18 kW which
is the factory setting)
9= section 9 18 = 18 kW
- press the key (C.H. side) once,
the 2nd and 3rd digits will flash
together. Then press the key
(D.H.W. side) to change to 3.0 on the
2nd and 3rd digits.
The display shows :
912 press the - key (C.H. side) to
confirm this value. The display will stop
flashing. The setting procedure is
finished.
To exit from the setting mode, leave the
boiler for approx. 1 minute the
computer will then return to the user
mode.
After programming is completed
please close the door. P(fig. 17)
1
Display
2x 3
1
2
or
33x 9
44
5 ”
9Adjustments and Settings (continued)

17
10 Incorrect Operation
In case of a problem, or when the boiler displays a message, the 2 digits will flash.. Please refer to the table
below to diagnose the default.
For default 01 and 03, the red indicator 35 will light (Fig.19)
35
Fig. 19
Overheat lock-out
FAULT
Code
display Fault description Operation Information
01 Overheat 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 C.H. mode
31 Communication problem with the display P.C.B.
32 Communication problem with the main P.C.B.
If the boiler is not set for the gas type, conversion kits are available. To convert the boiler, please use originally Chaffoteaux &
Maury parts and proceed as is mentioned in the instruction manual provided with the conversion kit.
11 Gas Conversion

18
USER INSTRUCTIONS
Control panel (Fig. 20)
16.- Pressure gauge
24.- Display
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 ON and RESET
(Reset button)
31.- Key to reduce the Central Heating temperature
32.- Key to increase 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 Control Panel
Connecting bracket (Taps shown in the open posi-
tion) (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
34 35
36
33
Fig. 20
STOP
+
+
+ +
Fig. 21
37 41
40
39 43
38
45

19
Switching on
1. Check that the pressure in the central heating system is above 0.7 bar and below 1.5 bar with the pressure gauge 16
(Fig.20)
2. Check that the gas service tap is opened at the gas meter and the main power is on. Green indicator (Power ON )
33 (Fig.20).
3. Open the gas tap 39 (Fig.21).
The boiler is now ready to use.
Attention ! If the boiler has been off for a long period of time without working, some air in the gas pipe can hinder the first
attempts to ignite. (please refer to section 18 (Incorrect Operation)
Switching on the Central heating
Press the key 29, the green indicator 30 (Fig.20) light and the display will show the
Heating flow temperature.
Keys 31 and 32 (Fig.20) allow the temperature to be adjusted as required in the
Central Heating system depending on the weather conditions.
•press to increase the temperature when the weather is cold
•press to reduce the temperature when the 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 the key 25, the green indicator 26 (Fig.20) will light :
If there is no water demand
the display will show the following graphic
During draw off
a square made of 4 digits will move clockwise on the display
Keys 27 and 28 (Fig.20) allow the temperature to be adjusted as required for the Domestic Hot Water flow. During the
temperature setting operation the display will flash.
Note : The configuration of the C.H. system can generate some gravity effect when the boiler is set to the D.H.W. mode only.
It may result in a temperature rise of the heating pipes close to the boiler (or eventually a radiator). To avoid this, it is possible
to close the heating flow isolating tap 37 (Fig.21) during the summer period (Central Heating switched off) Don’t forget to open
it before switching on the Central Heating mode again.
13 How to Use
Switching on the Domestic Hot Water and the Central Heating together
Press the key 29 the green indicator 30 (Fig.20) will light.
Press the key 25 the green indicator 26 (Fig.20) will light.
If there is no water demand the display will show the heating flow temperature
During draw off a square made of 4 digits will move clockwise on the display

20
As with a 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 in the Log Book.
14 Maintenance
Turn off the boiler
- Press the and keys, 25 and 29 to (Fig.20) switch off both the D.H.W. and the C.H. mode. The green indicators 30 and
26 (Fig.20) will go out.
- Switch off the main electrical supply
- Shut off the gas service tap 39 (Fig. 21)
Note : In this condition, the anti-freeze system is inoperative.
Stand by mode A fixed digit at the centre of the display and the green indicator 33
(Fig.20) will light.
Putting the boiler in stand-by mode and anti-freeze system. :
Press the and keys, 25 and 29 (Fig.20) to switch off both the D.H.W. and the C.H. mode. The green indicators 30
and 26 (Fig.20) will go out.
During the duration of the stand by mode, an automatic anti-sticking system will activate the pump for 1 minute and
operate the 3 way valve every 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 leave the Central Heating
mode on.
The boiler is equipped with an automatic anti freeze system which is permanently on.
If the Central Heating temperature decreases below 7oC, the pump will start.
If the Central Heating temperature decreases below 4oC, the pump and the burner will start.
13 How to Use (continued)
15 Guarantee
The manufacturer’s guarantee is valid for 12 months from the date of installation. 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 without delay.
16 Practical Information
Pump anti-sticking device
When the boiler is switched on, an automatic anti-sticking system will activate the pump for 1 minute and operate the 3 way
valve every 23 hours. This is a normal function.
Precaution to avoid freezing
We recommend you to contact your installer or local service centre for further information.
•D.H.W. system
Turn off the mains cold water supply and drain the boiler :
- Open a hot water tap
- Unscrew the cold water inlet tail
- Drain the water from the boiler with the D.H.W. drain screw 45 (Fig. 21)
•C.H. system
Chose one of the following solution :
- 1) Drain the Central Heating system completely.
- 2) Protect the Central Heating system with anti freeze chemical products and periodically check the concentration
- 3) Leave the Central Heating mode switched on and set the room thermostat to its anti-freeze mode (between 5 and 10oC)
- 4) Leave the boiler in stand-by mode, the anti-freeze device will activate the pump and the burner if necessary.