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