Chaffoteaux & Maury Centora green 24 Nat, Centora green 30 Nat Installation And Operating Instructions 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

T

hese instructions are suitable for the CENTORA GREEN boilers :

D

o not forget the Log Book!

C

haffoteaux & Maury supports Benchmark, the heating industry code to ensure the correct installation, commissioning and

s

ervicing of domestic central heating systems.

T

o 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
a

lso 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
c

heck. The service history of the appliance will be recorded on the Log Book.

I

n the unlikely event of any problems with your boiler or system you should first contact your installer. If your installer cannot

r

esolve the problem he should telephone our national service helpline.

T

his 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.
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.
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

1 DESCRIPTION.................................................................................................................................................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

S

TATUTORY 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,
S

cotland. The Centora Green is an approved product under the Water Regulations.

T

o comply with the Water Regulations, your attention is drawn to The Water Regulations guide published by the the Water

R

egulations 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.
I

nstallation 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

C

onnecting the boiler to the system.........................................................................................................8

Safety valve and condensats drains ........................................................................................................8

F

itting the horizontal flue .........................................................................................................................8

6 E

LECTRICAL CONNECTIONS ....................................................................................................................10

M

aking the Electrical Connections ........................................................................................................10

7 C

OMMISSIONING AND TESTING................................................................................................................10

P

re-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

8 FITTING THE CASING ..................................................................................................................................11

9 ADJUSTEMENTS 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

1000

1100 l/h

mCE

Débit mini (robinets thermostatiques fermés)

Hauteur manométrique

GVF

GVO

PVF

PVO

20 40 60 80 100 120Pf140 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 à froid pour le circuit chauffage (en bar)

C liter

2

3

Fig. 5

Fig. 6

4

40

4

50 mini pour entretien

With packaging :

24 : 43 kg
30 : 45,5 kg

5

4 54 54 54

J

KLMN

I

8

8

JKLMN

232

235

32

S

afety 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).

I S

afety valve C/H and condensate

J

H

eating flow

K

D.H.W. flow

L

Gas supply

M

Cold water inlet

N

Heating return

m

inimum 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

206

143

Ø 125

Ø 80

120

Ø 80

250

Ø 80

250

Ø 125

Ø

80

120

Ø 80

250

Ø 80

2

50

Type C 13

Type C 33

Ø 80

120

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

L

ocation

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
r

emoval of the flue products. A compartment or cupboard may
be used provided that it has been purpose-built or modified for
t

he 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

D

etailed 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
r

oom containing a bath or shower. It should only supply the

appliance.

The boiler is suitable for sealed systems only. The maximum
w

orking pressure for the appliance is 10 bar. All fittings and
pipework connected to the appliance should be of the same
s

tandard. 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

G

H

J

C

L

M

N

K

I

D,E

F

Q

H

N

M

Q

Q

I

Installation Requirements

8

5

P

lease 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

A and 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 I fig 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

A

WATERPROOF 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

A

A

A

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
t

he boiler from the terminal. The flue should rise up slightly to the terminal in order to let the condensate coming back into the

boiler.

A

ttention ! 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

T fig 14 .

N

ote: 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.

I

f using a room thermostat or other external control, they can be connected in place of the link

S o

n 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

T

2A

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

R

7a

Z7

Z

4

D46

T10

T9

RL8

RL7A

R

L7

RL10

RL2A

RL2

R

L9

R119

R118

R113

R9

R8

R7

R6

R31

R32

R29

R27

R25

R24

R23

R19

R18

R17

R140

R137

TH4

R13

R12

R

11

R115

C82

C81

T14

T13

R136

TH3

U11

R64

R

10

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

C

75

C

74

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
t

he residual head of the pump available for the system. The pump
fitted on the boiler is a double speed model. (GV = High speed and
P

V = 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.

T

T

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

A

A

A

A

Fig.16

b

a

r

0

1

3

4

Fig. 15

D

1

6

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.
A

ll 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 3 or 4 then 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 1 then 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

9

Adjustments 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

L

ast but one default occurred 1

•

c

ode 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

D

ISPLAY

ACTION CONFIGURATION

once

x times

x times

Note -- is displayed if no default is recorded.

14

Menu - 3 - Boiler options

DISPLAY

A

CTION

C

ONFIGURATION

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

0

1 : Burner and pump

Pump speed 1 0 : High speed

1 1 : 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

2 1,0 min

2 5,0 min

Maximum Central Heating flow temperature 4 50°C

4 80

°C

CH anti cycling delay 8 0,0 min

From 0 to 7 minutes by step of 0.5 min.

8

0,5 min

8 2,5 min

8 5,0 min

CH maximum output limitation

Model 24

From step 0 (P. min.) 8 kW Value from

to step 10 (P. max.) 24 kW

9

0 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

o

nce

x times

once

x times

15

Menu - 5 - Combustion rate control mode

X X

X X

D

ISPLAY

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

2

x 3

1

2

or

3

3

x 9

4

4

5 ”

9

Adjustments 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.

F

or default 01 and 03, the red indicator

35i

s alight (fig.19)

3

5

Fig. 19

O

verheating 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

3

4

35

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.

A

ttention ! 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

f

low 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

m

inute 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 with­out delay.

21

This appliance is suitable for Natural gas or LPG. A gas conversion must be made by a competent person.

17

18

If these solutions do not cure the fault, call a qualified professional

Fault

The boiler doesn’t start

Red indicator alight

Noises in CH system

Radiators rise in temperature During
summer season

Cause

No gas, no water or no electricity

Air in the gas pipe

Room thermostat switched off

Ignition lockout

Air presence in CH system or.
Insufficient pressure

Gravity effect in the CH system

Solution

Check the water pressure in the central
heating system and external electrical
supply, check that the gas supply is on,
should there still be a problem contact
your local service centre.

Contact your local service centre.

Turn up the room thermostat

Wait for a few minutes
Press the reset button

36 (fig.21) the red

led will go out and the boiler attempts to
re-light.

If the red indicator lights too frequently,
please call your local service centre.

Purge of air the system and rise up the
system pressure (chapter 8)

Close the heating flow isolating valve.
Don’t forget to open it again when you
will start heating.

Gas Conversion

Incorrect Operation

H

elpful suggestions

- Periodically check the system pressure using the pressure gauge and make sure that the pressure is between 1.0 and 1.5
bar when the system is off and cool. If the pressure is below the minimum recommended value, the pressure must be
brought into the acceptable range. Consult your installer for checking and refilling the system.

I

f the pressure level drops on a frequent basis, it is likely there is a water leak in the system. If this is the case, your

installer must inspect the system.

-

The outer panel of the boiler’s case must only be cleaned with a damp cloth, do not use abrasive cleaners. The control
panel can be wiped with either a damp or dry cloth. Spray polishes must not be used on the control panel surface or
k

nobs. Care must be taken in preventing any liquid entering the appliance.

- If the water is exceptionally hard, install a water softerner so that the efficiency of the boiler remains the same over time as
t

his will consume less gas.

22

19

Model Centora green 24 Centora green 30

A

ppliance category........................................... II 2H3P II 2H3P

Heat gross input C/H maxi ............................... 27.8 kW 94,534 Btu/h 31.6 kw 107,843 Btu/h

Heat gross input DHW maxi............................. 27.8 kW 94.534 Btu/h 31.6 kw 107,843 Btu/h

H

eat output C/H 50°/30° maxi.......................... 26 kW 88,732 Btu/h 30 kW 102,383 Btu/h

Heat output C/H 80°/60° maxi.......................... 24 kW 81,907 Btu/h 28 kW 95,557 Btu/h

Heat output DHW maxi .................................... 24 kW 81,907 Bth/h 30 kW 102,393 Btu/h

C/H operating temperature............................... 80°C max 25°C min 80°C max 25°C min

C/H circuit pressures Min operating................. 0.7 bar 10 Ib/in

2

0.7 bar 10 Ib/in

2

C/H circuit pressures Max operating................ 2.5 bar 36.3 Ib/in

2

2.5 bar 36.3 Ib/in

2

DHW flow rates 30°C ....................................... 12 l/min 2.66 gal/min 14 l/min 3.10 gal/min

DHW flow rates 35°C ...................................... 10.3 l/min 2.29 gal/min 12 l/min 2.66 gal/min

Cold water mains pressures Min operating...... 0.5 bar 7.25 Ib/in

2

0.5 bar 7.25 Ib/in

2

Cold water mains pressures Max operating..... 10 bar 145 Ib/in

2

10 bar 145 Ib/in

2

Flow limiter rate................................................ 8 l/min 10 l/min

Compartment ventilation .................................. not required not required

Natural gas G20

Gas rate C/H max ............................................ 2.64 m3/h 93 ft3/h 3.01 m3/h 106 ft3/h

Gas rate DHW max.......................................... 2.64 m

3

/h 93 ft3/h 3.01 m3/h 106 ft3/h

Gas rate C/H & DHW mini................................ 0.87 m

3

/h 31 ft3/h 1 m3/h 35 ft3/h

Gas valve restrictor diameter ........................... without without

Propane L.P.G G31

Gas rate C/H max. ........................................... 1.94 kg/h 36 ft3/h 2.21 kg/h 41 ft3/h

Gas rate DHW max.......................................... 1.94 kg/h 36 ft

3

/h 2.21 kg/h 41 ft3/h

Gas rate C/H & DHW mini................................ 0.64 kg/h 12 ft

3

/h 0.73 kg/h 13 ft3/h

Gas valve restrictor diameter ........................... 4.40 mm 4.8 mm

Safety discharge .............................................. 3 bar 43.5 Ib/in

2

3 bar 43.5 Ib/in

2

Expansion vessel - Pre-charge pressure ......... 0.7 bar 9.4Ib/in

2

0.7 bar 9.4Ib/in

2

Net capacity at 3 bar in liter.............................. 5.44 5.44

Adjustable by-pass
Electrical characteristicis

Supply .............................................................. 230 v 230 v

Consumption.................................................... 150 w 150 w

Protection......................................................... IP 44 IP 44

Fuse F1............................................................ 2 A 2 A

Fuse F2............................................................ 1.25 A 1.25 A

Fuse F3............................................................ 0.315 A 0.315 A

Fuse F4

............................................................ 0.250 A 0.250 A

External controls .............................................. 24 v 24 v

Technical Data

23

1309033d - 3/2004

Chaffoteaux & Maury are continuously improving their products and therefore reserve the right to change specifications without
prior notice and accepts no liability for any errors or omission in the information contained in this document.

Manufacturer: Chaffoteaux & Maury - France

Commercial subsidiary: MTS

(GB) Limited

MTS

Building
Hughenden Avenue
High Wycombe
Bucks HP13 5FT

Telephone:

[phone]
Fax: [phone]
Internet: www.chaffoteaux.co.uk
E-mail:

[e-mail]

Technical Support Help Line: 0870 241 8180
Customer Service Help Desk: 0870 600 9888

This appliance is suitable for Natural gas or LPG. A gas conversion must be made by a competent person.