Ariston A 30 RFF, A 24 RFF User Manual

SSYYSSTTEEMM AA

System A 24 RFFI
System A 30 RFFI

Installation and
Servicing
Instructions
Type C Boilers

G.C.N: 47-116-14 (24 kW)
G.C.N: 47-116-15 (30 kW)

LEAVE THESE
INSTRUCTIONS WITH THE
END-USER

Country of destination

GB

IE

These instructions are suitable for the System A boilers :

MTS supports Benchmark, the heating industry code to ensure the correct installation, commissioning and servicing of
domestic central heating systems.

To The Householder
Make sure that your installer completes Section 24 of this manual

boiler.
It contains important information about your particular installation that may be required by service engineers. It will also provide

contact details for the installer should you need guidance in the use of this appliance or if there are any problems.
As with your car, your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service

check. The service history of the appliance must be recorded in Section 25 of this manual.
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 MTS Service is called out to resolve a non-product related fault.
Your statutory rights are not affected.

To The Installer

As part of the commissioning of this appliance it is necessary to complete Section 24 of this manual and give this manual to the
Householder. Please ensure that your customer is aware of the importance of keeping this manual safe as a record of the
installation (Section 24) and the appliance service history (Section 25).

, this provides a record of the commissioning of your

Please ensure that your customer is aware of the correct operation of the system, boiler and controls.
MTS recommend the use of protective clothing, when installing and working on the appliance i.e. gloves.

CUSTOMER CARE

MTS, 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.

Advice on installation or servicing can also be obtained by contacting the Chaffoteaux Technical and Customer Service
Departments on:

TECHNICAL DEPARTMENT CUSTOMER SERVICE DEPARTMENT
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]

GUARANTEE

The manufacturer’s guarantee is for 2 years 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.

CAUTION

In the United Kingdom, installation, start-up, adjustments and maintenance, must be performed by a competent person only, in
accordance with the current Gas Safety (Installation & Use) Regulations and the instructions provided.

In the Republic of Ireland, the installation and initial start up of the appliance must be carried out by a Competent Person in
accordance with the current edition of I.S.813 “Domestic Gas Installations”, the current Buidling Regulations, reference should
also be made to the current ETCI rules for electrical installation.

All CORGI registered installers carry a CORGI ID card, and have a registration number. Both should be recorded in
the Benchmark Commissioning Checklist (Section 24). You can check your installer is CORGI registered by calling
CORGI direct on:- [phone].

Improper installation may cause damage or injury to individuals, animals and personal property for which the manufacturer will
not be held liable. To ensure efficient and safe operation it is recommended that the boiler is serviced annually by a competent
person.

If it is known that a fault exists on the appliance, it must not be used until the fault has been corrected by a competent person.

2

Contents

USTOMER CARE

C

uarantee ............................................................................................................................................................2

G

Statutory Requirements .......................................................................................................................................2

ontents ...............................................................................................................................................................3

C

NTRODUCTION ..................................................................................................................................................4

I

USER’S INSTRUCTION.......................................................................................................................................5

1 CONTROL PANEL...........................................................................................................................................5

2 HOW TO USE .................................................................................................................................................6

Switching on ..........................................................................................................................................6

Time setting ............................................................................................................................................6

Heating ...................................................................................................................................................6

Burner ON................................................................................................................................................6

Stand by mode ........................................................................................................................................6

Switch OFF .............................................................................................................................................6

Anti freezing mode ..................................................................................................................................7

3 MAINTENANCE ..............................................................................................................................................7

4 GUARANTEE ..................................................................................................................................................7

5 PRACTICAL INFORMATION...........................................................................................................................7

6 SETTING THE TIME CLOCK ..........................................................................................................................8

6.1 SETTING THE MECHANICAL CLOCKS .................................................................................8

6.2 SETTING THE DIGITAL CLOCK..............................................................................................9

Page

INSTALLERS’ INSTRUCTIONS.........................................................................................................................11

7 DESCRIPTION...............................................................................................................................................11

8 DIMENSIONS ................................................................................................................................................12

9 HYDRAULIC DATA .......................................................................................................................................12

10 INSTALLATION REQUIREMENTS................................................................................................................13

11 INSTALLING THE BOILER............................................................................................................................17

12 CONNECTING THE FLUE.............................................................................................................................

12.1 FITTING THE COAXIAL FLUE

12.2 FITTING THE 5” FLUE ..........................................................................................................................20

12.3 FITTING VERTICAL FLUE....................................................................................................................22

12.4 FITTING THE TWIN FLUE ....................................................................................................................23

13 ELECTRICAL CONNECTIONS .....................................................................................................................26

14 COMMISSIONING AND TESTING................................................................................................................32

14.1 INITIAL PREPARATION........................................................................................................................32

14.2 INITIAL START-UP

14.3 ADJUSTING THE CO2..........................................................................................................................33

14.4 GAS CONVERSION

14.5 ADJUSTING THE MAXIMUM HEATING POWER ................................................................................33

14.6 FITTING THE EXTERNAL SENSOR.....................................................................................................33

14.7 EXTERNAL SENSOR SET-UP..............................................................................................................34

14.8 COMPLETION.......................................................................................................................................34

14.9 OPERATIONAL CHECKS .....................................................................................................................34

14.10 INSTRUCTING THE END USER...........................................................................................................35

15 FITTING THE CASING

16 SEQUENCE OF OPERATION.......................................................................................................................37

CENTRAL HEATING MODE

17 ADJUSTMENTS AND SETTINGS.................................................................................................................38

................................................................................................................................

..............................................................................................................................33

..................................................................................................................................36

.............................................................................................................

.................................................................................................................

19
20

32

37

3

SERVICING INSTRUCTIONS

18 REPLACEMENT OF PARTS.........................................................................................................................45

18.1 To Gain General Access........................................................................................................................45

18.1.1 Removing the front panel.......................................................................................................................45

18.1.2 Lowering the control panel.....................................................................................................................45

18.2 Access to the Combustion Chamber .....................................................................................................46

8.2.1Removing the combustion chamber front panel ....................................................................................46

1

18.2.2 Removing the burner .............................................................................................................................47

8.2.3Removing the detection electrode .........................................................................................................47

1

18.2.4 Removing the ignition electrode.............................................................................................................47

8.2.5Removing the fan...................................................................................................................................48

1

18.2.6 Removing the gas valve.........................................................................................................................48

18.2.7 Removing the heat exchanger...............................................................................................................49

18.2.8 Removing the spark generator...............................................................................................................49

18.3 ACCESS TO THE WATER CIRCUIT....................................................................................................50

18.3.1 Drain down.............................................................................................................................................50

18.3.2 Removing the 3 way valve.....................................................................................................................50

18.3.3 Removing the 3 way valve shutter.........................................................................................................50

18.3.5 Removing the pump...............................................................................................................................51

18.3.6 Removing the pressure relief valve ......................................................................................................51

18.3.7 Removing the domestic expansion vessel.............................................................................................52

18.3.8 Removing the overheat thermostat........................................................................................................52

18.3.9 Removing the temperature sensors (NTC’s).........................................................................................52

18.3.10 Removing the pressure gauge...............................................................................................................53

18.3.11 Removing the DHW flow switch.............................................................................................................53

18.3.12 Removing & cleaning the condensate trap............................................................................................53

18.4 ACCESS TO THE CONTROL SYSTEM ...............................................................................................53

18.4.1 Removing the PCB’s..............................................................................................................................53

18.4.2 Removing the fuses...............................................................................................................................54

18.5 CONNECTING THE EXTERNAL SENSOR..........................................................................................54

19 INCORRECT FUNCTION......................................................................................................................55

20 GAS CONVERSION .............................................................................................................................56

21 INCORRECT FUNCTION......................................................................................................................

22 MAINTENANCE INSTRUCTIONS.........................................................................................................57

22.1 GENERAL REMARKS...........................................................................................................................57

22.2 CLEANING THE PRIMARY EXCHANGER...........................................................................................57

22.3 OPERATIONAL TEST...........................................................................................................................57

23 SHORT SPARES LIST

24 TECHNICAL DATA................................................................................................................................59

25 BENCHMARK COMMISSIONING CHECKLIST

26 SERVICE INTERVAL RECORD............................................................................................................62

..........................................................................................................................58

....................................................................................61

56

INTRODUCTION

The System A is a fully automatic, wall mounted, low water content condensing system boiler. It is a room sealed,
fan assisted, balanced flued appliance providing central heating. 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.

The System
cylinder.

A Plus

includes a diverter valve and so can provide central heating and hot water flow for an indirect

4

1. Control panel

USER’S INSTRUCTIONS

0

3

(System Plus only)

Fig 1

32

Control panel (fig. 1)

26.- Display

27.- On/off push button and power on indicator light

29.- Reset push button and red indicator locking light

30.- Cylinder Hot water start button and temperature

setting (System Plus only)

31.- Central Heating start button and temperature setting

32.- Menu button

33.- Reducing button

34.- Increasing button

35.- Setting button

26

27

33

Connecting bracket

Taps shown in Open position (fig. 2)

39 : Gas service tap
40 : Cylinder return valve (System Plus only)
41 : Central heating flow isolating valve

42 : Central heating return isolating valve
43 & 44: Filling taps
45 : Filling loop

34

35

29

31

41

40

43

Fig. 2

45

42

44

39

5

2. How to Use

+

+

Switching on and filling instructions

1. Check the pressure in the central heating system is above 0.7 bar and below 1.5 bar with the pressure gauge 16 (fig.1),
should it be neccessary to re-pressurise the system,ensure the filling loop
the pressure gauge will now start to rise, once the pressure reads 1.0 bar, close the filling taps and disconnect the filling loop.

2. Check that the gas service tap is opened at the gas meter and the main power is on. Green
indicator

3. Open the gas tap

4. The boiler is now ready to use.

NOTE: If the boiler is left off for a long time, some air in the gas pipe can hinder the first lighting

Time setting

You can set the time by using the keys underneath the display.

ress the setting key for 5 seconds. The hour digits on the display will begin to flash. Set the correct time by using the or

P

keys. To alter the minutes, press the setting key again, the minute digits will begin to flash. Set the correct time by using

the or keys, once the correct time has been set, press the setting key once more to accept the time.
Note: This is not a timer for Central Heating control.

To obtain heating

Turn the Central heating knob (30 Fig.1) between mini and maxi.
During the setting flashes and displays the temperature the knob has been
set to.

27 Power ON

39 (fig.2).

ttempts. (please refer to Section 19 Incorrect Function, page 47)

a

45 (fig. 2) is attached, open the filling taps 43 & 44,

OP

EN

CL

OSED

The flashing will continue for a while after the setting and the display will then
indicate one of the following :

- the heating temperature when the room thermostat is ON (Calling).

- the time when the room thermostat is OFF (Satisfied).

Tank pre-heating mode (System plus only)

Turn the control knob 30 between min and max. During the adjustment, flashes.
The flashing goes on for a while after the adjustment, then the display indicates the time.

When DHW is drawn, the display indicates the following:

Heating mode

Turn the control knob 31 between min and max. During the adjustment flashes.
The flashing goes on for a while after the adjustment, the display will then indicate:

- the central heating flow temperature if the room thermostat is calling for heat.

- the time if the room thermostat is OFF.

Room thermostat request

pictogram

Room thermostat request symbol

BURNER ON and output level

The flame digits will increase or decrease depending on the output.

"Programming" button: button not activated, the domestic hot water exchanger temperature holding function is
activated permanently.
"Yellow" button activated, the temperature holding function respects the programme (11 p.m. OFF, 6 a.m. ON, original
setting). The display indicates the following

6

Flame digit

Burner ON

Anti-freeze and anti-sieze modes

Provided the ON/OFF button is on (green light), the water pressure is adequate and the boiler has not shut down due to an
error, the anti-freeze and ant-sieze operations will remain active.

hen the anti-freeze comes on, one of two codes will be displayed with the snowflake pictogram .

W
The two possible codes are 05 (pump anti-freeze) or 06 (burner anti-freeze).

05 (Pump anti-freeze):

When the boiler senses a temperature of 8°C or lower, the pump will run for 2 minutes, the

oiler will then check if the flow temperature is higher than 8°C. Should the temperature

b
still be between 3°C and 8°C the above process will be repeated a maximum of 10 times,
after this the burner will light and run until a temperature of 33°C is detected (see 06

urner anti-freeze below).

B

06 (Burner anti-freeze):

When the boiler senses a temperature of 3°C or lower, the boiler will fire at minimum power until a temperature of 33°C is

chieved, the pump will run for 2 minutes after the burner is switched off.

a

nti-sieze mode

A

The anti-sieze mode will activate the pump for 1 minute everytime the boiler has been inactive for 23 hours.

Note: The anti-freeze and anti-sieze modes will be automatically overriden as soon as there is a demand for heaing from the
room thermostat or cylinder thermostat.

The anti-freeze functions will only protect the boiler from freezing, to protect the Central Heating system it will be necessary to
leave the boiler powered, the Central Heating knob turned on and the room thermostat set to its anti-frost setting (usually
between 5°C and 10°C).

3. Maintenance

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 in the Service Interval Record (

Section 25).

4. Guarantee

The manufacturer`s guarantee is for 2 years 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.

5. Practical information

Cleaning the casing and control panel

Should it be necessary to clean the casing and control panel, do so only with a damp cloth, do not use any spray polishes or
cleaners.

Precaution to avoid freezing

We recommend that you contact your installer or local service centre for further advice on the actions to be taken to avoid the
system freezing (should the boiler be turned off at the mains isolator)

• CH system

Choose 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 Heating mode switched on and set the room thermostat to anti-freeze mode (between 5 and 10°C)

- 4) Leave your boiler in stand-by mode, the anti-freeze device will switch on the pump and the burner if necessary.

• DHW system

Turn off the main cold water supply and drain the cylinder.

7

3

6

9

12

11

22

33

44

55

66

77

88

99

1010

1111

1212

1313

1414

1515

1616

1717

1818

1919

2020

2121

2222

2323

2424

99

66

1212

I

6. Setting the time clock

6.1 Setting the mechanical clock

Fig. 3

A

Fig. 4

1. General layout

The mechanical clock covers a 24 hour period. Each tappet represents 15 minutes A (Fig. 4). An override switch is located on

B (Fig 4).

symbol to control the central heating by the clock. Put the switch

B to «I» to select

the clock

2. To set the time

To set the time of day, grasp the outer edge of the dial and turn slowly clockwise until the correct time is lined up with the arrow

C (Fig. 4).

3. To Set the "On" and "Off" times

The clock uses a 24hours system. e.g. 8 = 8.00 am and
18 = 6.00 pm "ON" periods are set by sliding all tappets between the "ON" time and the "OFF" time to the outer edge of the
dial.The tappets remaining at the centre of the dial are the "OFF" periods.

4. For operation

Put the selector switch B to the
permanent operation or to «0» to turn the central heating off permanently.

C

B

8

6. Setting the time clock (continued)

P

r

o

g

.

h

m

Day

M

anual switch

S

ummer and

w

inter time

setting

Reset

E

nter

w

eekday/s

E

nter

the hours

W

eek-

d

ays

flash
E

nter

minutes

E

nter

switching

t

imes

I

mput

time

Automatic Manual Continuous
Operation Operation Operation

The switching If the current You can only
times corres- switching mode is return to automatic
pond to the changed manually, mode from the
program the next switching continuously-ON
entered. time will be and continuously-
 carried out auto- OFF switching
 matically again modes by
 according to the pressing the " "
 entered switching key.
 program.

= ON = ON = Continuously ON

= OFF = OFF = Continuously OFF

6.2 Setting the Digital Clock

Operating the time switch

The steps marked with the symbol “

Preparing for Operation

” are necessary to carry out a switching program.

Activate the “Res” switch (=RESET) to reset the time switch to its default setting (activate using a pencil or similar pointed
instrument). Do this:

- every time you wish to “reset” the time switch

- to erase all switching times and the current time of day.
After approximately two seconds the following display appears:

Enter current time and weekday

- Keep the “ ” button pressed down
During the summer time period press the +/- 1h button once.
Enter the hour using the “h” button
Enter the minutes using the “m” button
Enter the day using the “Day” button

1 = “Monday”..............7 = Sunday

- Release the “ ” button.

9

6. Setting the time clock (continued)

Entering the switching times

ou have 20 memory Iocations available. Each switching time takes up one memory location.

Y

eep pressing the “Prog” button until a free memory location is shown in the display “– –:– –”.

K

rogramme ON or OFF with the “ ” button:

P
“ ”= OFF; “ ”= ON
Enter the hour using “h”
Enter the minutes using “m”
If a switching command is to be carried out every day (1 2 3 4 5 6 7) then store using the “ ” button, otherwise select the
day(s) it is to be carried out by using the “Day” button.
When the day seIection is left bIank, the programmed switching instruction operates at the same time every day

2 3 4 5 6 = Monday – Saturday

1

2 3 4 5 = Monday – Friday

1
6 7 =Saturday – Sunday

Selection of single days: 1 = Mon. .............. 2 =Tues.

Save the switching time with the “ ” button.
The time switch enters the automatic operating mode and displays the current time of day.
Begin any further entry of a switching time with the “Prog” switch. If your entry is incomplete, the segments not yet selected
will blink in the display. After programming is completed, and you return the time clock to the current time display with the “
” button, the time clock will not activate any switching instruction required for the current time. You may need to manually
select the desired switching state with the “ ” button. Thereafter, as the unit encounters further switching instructions in
the memory in real time, it will correctly activate all subsequent switching instructions.

Manual Override Switch “ ”

With the “ ” you can change the current setting at any time. The switching program already entered is not altered.

Reading the programmed switching times

Pressing the “Prog” button displays the programmed switching times until the first free memory location appears in the display “–
– : – –”.

If you now press the “Prog” button once again, the number of free memory Iocations will be displayed, e.g. “
locations are occupied, the display “

Changing the programmed switching times

Press the “Prog” button repeatedly until the switching time you want to change is displayed. You can now enter the new data. See

Entering the switching times”.

point “

Notes on storing switching times:

If you end your entry of the switching times by pressing the “Prog” button, then the switching time you have entered will be stored
and the next memory location displayed.

In addition, a complete switching command is stored
pressed. The time switch then enters the automatic operating mode and displays the current time again.

Deleting individual switching times

Press the “Prog” button repeatedly until the switching time you wish to delete is shown in the display. Then set to “– –” using the
“h” or “m” button and keep the “ ” button pressed down for around 3 seconds. The switching time is now erased and the current
time is displayed.

00” appears.

automatically after around 90 seconds provided no other button is

18”. If all memory

AM / PM time display

If you press the “+/-1h” and “h” buttons at the same time, the time display switches into the AM/PM mode.

10

7. Description

24
10

2

3

8

20

22
21

12

6

INSTALLER’S INSTRUCTIONS

- Steel chassis complete with expansion vessel

1.

1

25

9

7

4

5

42

2.- Sealed chamber

3.- Burner and heat exchanger assembly

4.- Air / gas connection

- 24 V modulating fan

5.

6.- Gas valve

- Ignition electrode

7.

8.- Ionisation probe

- Ignitor

9.

10.- Combustion products manifold

11.- Siphon

12.- Silencer

- Electrical box

13.

14.- Pump

16.- Pressure gauge

17.- Three way valve

18.- Automatic air separator and automatic vent

20.- Main exchanger inlet thermistor

21.- Main exchanger outlet thermistor

22.- Overheat sensor

23.- Central heating pressure relief valve

24.- Manual air vent with pipe

25.- Thermo fuse

13

16

Fig. 5

(System Plus only)

30

27

26

29

14

23

11

Fig. 6

31

26.- Display

27.- On/off push button and power on

indicator light

29.- Reset push button and red indicator
locking light

30.- DHW control knob and temperature
setting

(System Plus only)

31.- Central Heating control knob

temperature setting

32.- Menu button

33.- Reducing button

34.- Increasing button

35.- Setting button

and

17

18

Fig. 7

32

33

34

35

11

8. Dimensions

440

450 mini pour entretien

54 54 54 54

JKLMN

I

JKLMN

32

296

141

289

2

1

720

691,5

121,5

I

172,5

4,7

0

0.05

0.1

0.15

0

.2

0

.25

0

.3

0

.35

0.4

0

.45

0

200 400 600 800 1000 1200 1400

24 kW

30 kW

20 40 60

80 100 120

Pf

140 160 180 200 220 240

1,0

1,1

1,2

1,3

1,4

1,5

1,6

1,7

1,8

1,9

2,0

Capacité maximale de l'installation (en litres)

260

Pression à froid pour le circuit chauffage (en bar)

280

40°C

50°C

60°C

70°C

80°C

62

1

296 (24 kW)

60 (30 kW)

3

All dimensions in mm

afety valve C/H and condensate

I S

eating flow

J

H

K Cylinder return (System Plus only)
L

Gas supply

M

Cold water supply

N

Heating return

With packaging :

24 kW : 34 kg
30 kW : 37 kg

minimum space required 450

390

Fig. 8

9. Hydraulic data

Pressure (bar)

Central heating initial pressure when cold (in bar)

12

System capacity chart

Pump Head Graph (15/50 & 15/60)

flow rate (l/hr)

Fig. 9

C litre

Fig. 10

The boiler is fitted with an automatic by-pass as standard.
The graph (Fig. 9) shows the development of the pressure

available in relation to flow (on exit from the boiler ∆T
20°C).

To ensure correct operation, the minimum flow of the
appliance must be 300 l/h. (Thermostatic taps closed).

Capacity of the installation.
The water heater is fitted with a pressurised expansion

vessel.
Volumes : 6 litres
Pressure: 0,7 bar.
The volume of the expansion vessel in a pressurised

appliance varies according to:

C

- the average operating temperature in

°

- the static height, which is the difference in metres
between the highest point of the appliance and the
expansion vessel axis).

The minimum cold filling pressure of the appliance is 1 bar
(recommended pressure between 1.2 and 1.7 bar).

The pressure of the expansion vessel should always be
greater than the static height (in metres) divided by 10.

E

E

10. Installation Requirements

Reference Standards

In the United Kingdom, the installation and initial start up of

he boiler must be by a CORGI Registered installer in

t
accordance with the installation standards currently in effect,
as well as with any and all local health and safety standards
i.e. CORGI.

In the Republic of Ireland the installation and initial start up of

he appliance must be carried out by a Competent Person in

t
accordance with the current edition of I.S.813 “Domestic Gas

nstallations” and the current Building Regulations, reference

I
should also be made to the current ETCI rules for electrical

nstallation.

i

he installation of this appliance must be in accordance with

T
the relevant requirements of the Local Building Regulations,
the current I.E.E. Wiring Regulations, the by-laws of the local
water authority, in Scotland, in accordance with the Building
Standards (Scotland) Regulation and Health and Safety
document No. 635, “Electricity at Work Regulations 1989”
and in the Republic of Ireland with the current edition of I.S.
813 and the Local Building Regulations (IE).

For detailed information on the installation of Condensing
boilers, reference should be made to the

the Condensing Boiler Assesment Procedure for
Dwellings

.

ODPM Guide to

such as an outhouse or closed lean-to.

ondensing boilers have a tendency to form a plume of water

C
vapour from the flue terminal due to the low temperature of the
flue gasses. The terminal should therefore be located with due
regard for the damage or discolouration that might occur to

uildings in the vicinity and consideration must also be given to

b
adjacent boundaries, openable windows should also be taken

nto consideration when siting the flue.

i
The minimum acceptable clearances are shown below:

Fig. 11

C.O.S.H.H.

Materials used in the manufacture of this appliance are non­hazardous and no special precautions are required when
servicing.

Codes of Practice

Installation should also comply with the following British
Standards Codes of Practice:

BS 7593:1992 Treatment of water in domestic hot

water central heating systems
BS 5440-1:2000 Flues
BS 5440-2:2000
BS 5449:1990 Forced ciculation hot water systems
BS 6798:2000

BS 6891:1998 Installation of low pressure gas pipe up

BS 7671:2001
BS 4814:1990 Specification for expansion vessels
BS 5482:1994 Installation of L.P.G.

and in the Republic of Ireland in accordance with the
following codes of practice

I.S. 813 Domestic Gas Installations

Air Supply

Installation of gas fired hot water

boilers of rated input not exceeding

70kW

to 28mm

IEE Wiring Regulations

A - Directly below an open window or other opening 300
B - Below gutters, solid pipes or drain pipes 75
C - Below eaves 200
D - From vertical drain pipes and soil pipes 75
E - From internal or external corners 300
F - Above ground on a public walkway or patio 2100
G- From a surface facing a terminal 2500
H - From a terminal facing a terminal 2500

I - Vertically from a terminal in the same wall 1500
J - Horizontally from a terminal in the same wall 300
K - Horizontally from an opening window 300
L - Fixed by vertical flue terminal

T

NOTE:

It may be necessary to protect the terminal with a guard, if this is
the case it will be necessary to purchase a stainless steel terminal
guard. Reference should be made to the Building Regulations for
guidance.

Ventilation

The room in which the boiler is installed does not require specific
ventilation.

permanent ventilation is not required for cooling purposes.

FLUE MUST NOT BE INSTALLED IN A PLACE LIKELY TO

HE

CAUSE A NUISANCE

If it is installed in a cupboard or compartment

.

Avoid installing the boiler where the air inlet can be polluted
by chemical products such as chlorine (swimming pool area),
or ammonia (hair-dresser), or alkaline products (launderette)

Flue
Detailed information on flue assembly can be found in Section

12 “Connecting the flue”

The boiler must be installed so that the flue terminal is
exposed to the free passage of external air at all times and
must not be installed in a place likely to cause nuisance. It
must not be allowed to discharge into another room or space

.

Gas Supply

The gas installation and soundness testing must be in
accordance with the requirements of BS 6891. Ensure that
the pipe size is adequate for demand including other gas
appliances on the same supply.

Electrical Supply

The appliance requires an earthed 230V - 50 Hz supply and
must be in accordance with current I.E.E. regulations.

13

10. Installation Requirements (continued)

t must also be possible to be able to completely isolate the

I
appliance electrically. Connection should be via a 3 amp

used double-pole isolating switch with a contact separation

f
of at least 3 mm on both poles. Alternatively, a fused 3 Amp.

pin plug and unswitched socket may be used, provided it is

3
not used in a room containing a bath or shower. It should

nly supply the appliance.

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

working pressure for the appliance is 6 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 6 bar, particularly at night, then a
suitable pressure limiting valve must be fitted.
The boiler is designed to provide Central Heating on demand

o a Central Heating system and to heat an Indirect Hot

t
Water Storage Cylinder.

Flushing and Water Treatment

The boiler is equipped with a stainless steel heat exchanger.
The detailed recommendations for water treatment are given

in BS 7593:1992 (Treatment of water in domestic hot water
central heating systems); the following notes are given for
general guidance;

If the boiler is installed on an existing system, any
unsuitable additives must be removed.

Under no circumstances should the boiler be fired before the
system has been thoroughly flushed; the flushing procedure
must be in line with BS7593:1992.

We highly recommend the use of a flushing detergent
appropriate for the metals used in the circuit. These include
cleansers produced by Fernox and BetzDearborn, whose
function is to dissolve any foreign matter that may be in the
system;

In hard water areas or where large quantities of water are in
the system the treatment of the water to prevent premature
scaling of the main heat exchanger is necessary.

The formation of scale strongly compromises the efficiency of
the thermic exchange because small areas of scale cause a
high increase of the temperature of the metallic walls and
therefore add to the thermal stress of the heat exchanger.

Demineralised water is more aggressive so in this situation it
is necessary to treat the water with an appropriate corrosion
inhibitor.

Any treatment of water by additives in the system for frost
protection or for corrosion inhibition has to be absolutely
suitable for all the metals used in the circuit.

The use of a corrosion inhibitor in the system such as Fernox
MB-1, BetzDeaborn Sentinel X100 or Fernox System
Inhibitor is recommended to prevent corrosion (sludge)
damaging the boiler and system;

If anti-freeze substances are to be used in the system, check
carefully that they are compatible with the metals used in the
circuit.

TS suggests the use of suitable anti-freeze products such

M
as Fernox ALPHI 11, which will prevent rust and incrustation

aking place.

t

eriodically check the pH of the water/anti-freeze mixture of

P
the boiler circuit and replace it when the amount measured is

ut of the range stipulated by the manufacturer ( 7 < pH < 8).

o
DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE

In under-floor systems, the use of plastic pipes without
protection against penetration of oxygen through the walls
can cause corrosion of the systems metal parts
(metal piping, boiler, etc), through the formation of oxides
and bacterial agents.

o prevent this problem, it is necessary to use pipes with an

T
“oxygen-proof barrier”, in accordance with standards DIN
4726/4729

system separate by installing heat exchanger

with a specific system water treatment.

IMPORTANT
Failure to carry out the water treatment procedure will
invalidate the appliance warranty.

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 should be made to British Gas
Document DM2, or advice sought from CORGI.

Where a room sealed appliance is installed in a room
containing a bath or shower, the appliance and any
electrical switch or appliance control, utilising mains
electricity should be situated specifically in accordance
with current IEE Wiring Regulations.

For unusual locations, special procedures may be necessary.

BS 6798:2000 gives detailed guidance on this aspect.

Condensate Discharge

The condensate discharge hose from the boiler must have a
continuous fall of 2.5
into a suitable acid resistant pipe - e.g. plastic waste or
overflow pipe.
minimum diameter of 22mm, must have a continuous fall and
preferably be installed and terminated to prevent freezing.
The discharge pipe must be terminated in a suitable position:

i)

ii) Connecting into the waste system of the building such as

. If pipes of this kind are not used, keep the

s of those

o

and must be inserted by at least 50mm

The condensate discharge pipe must have a

Connecting into 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 also must be an air break upstream of the trap.

a washing machine or sink trap. The connection must 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.

14

10. Installation Requirements (continued)

iii) Terminating into a gully, below the grid level but above

the water level.

iv) Into a soakaway.
NOTE:

externally then it should be kept to a minimum and be
insulated with a waterproof insulation and have a continuous

If any condensate pipework is to be installed

fall. The total length of external pipe used should not exceed
3 metres.
Some examples of the type of condensate terminations can
be found below.

1. Internal termination of condensate drainage pipe to internal stack

2. External termination of condensate drainage pipe via internal discharge branch
(e.g. sink waste) and condensate siphon

15

10. Installation Requirements (continued)

3. External termination of condensate drainage pipe via internal discharge
branch (e.g. sink waste - proprietary fitting)

4. External termination of condensate drainage pipe via condensate siphon

16

11. Installing the Boiler

Please check that you are familiar with the installation requirements before commencing work (Section 10).
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)

- Connection tails and valves

- Screws and washers

- Connection washers

- Installation, Servicing and Operating Instructions
Air Inlet Header (for use with twin flue pipe)

-

- Guarantee Card

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. 12, unscrew the clamp locking bolt
Place the boiler on the wall on the hanging bracket (Fig. 14).

NOTE: TH

Connecting the boiler to the system

- Remove the boiler casing as described in Section 18.

- Push in the tabs “

- Remove the caps and connect the valves to the boiler using the washers provided in the plastic bag.

E APPLIANCE MUST NOT BE FITTED ON A COMBUSTIBLE WALL SURFACE

P” (Fig. 14) on either side of the boiler and pivot the electrical box forward to gain access to the valve

connections
2 x fibre washers for the C/H flow and return.

1 x rubber washer for gas connection

A and remove the casing (Fig. 13).

.

Safety valve discharge

The pressure relief valve tube is made of copper. It should terminate below the boiler 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.

Fill the Central Heating and DHW system and bleed air from the system as described in Section 14 .
The system should be carefully checked for leaks, as frequent refilling could cause premature system corrosion or
unnecessary scaling of the heat exchanger. The condensate pipe from the siphon (11 Fig. 6) should be connected to a drain
as described in the relevant Brittish regulations.
Pay special attention to not bend the plastic condensate drain pipe in such a way as to cause the flow to be interrupted. Please
use exclusively drain pipe material compatible with condensate products. (refer to
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 trap (11 Fig. 6) must be
filled with water. Before fitting the flue onto the boiler, pour 1/4
litre of water into the exhaust pipe as shown in Fig. 15 (page 19).

Instructions on fitting the flue can be found in Section 12.

IMPORTANT!!
Use only the specific condensation flue kit supplied by MTS
(GB) Limited.

BS 6798 : 2000)

17

1

2

11. Installing the Boiler (continued)

ig. 12

F

A

A

Fig. 13

P

P

Fig. 14

18

Fig. 15

5

118

12. Connecting the Flue

150 mm

* pente 5 mm par mètre

150

mm

* pente

The boiler should only be installed with a flue system supplied by MTS (GB) Limited.
These kits are supplied separately to the appliance in order to respond to different installation solutions. For more information
with regard to the inlet/outlet accessories consult the accessory catalogue. The boiler is supplied ready for connection to a

oncentric flue system.

c

O

:SE

N

TE

IMPORTANT!!

BEFORE CONNECTING THE FLUE, ENSURE THAT 1
WATER HAS BEEN POURED INTO THE EXHAUST CONNECTION
TO FILL THE CONDENSATE TRAP (FIG. 16). SHOULD THE
T

RAP BE EMPTY THERE IS A TEMPORARY RISK OF FLUE

GASSES ESCAPING INTO THE ROOM

E PAGE

24 F

OR MAXIMUM AND MINIMUM FLUE RUNS

.

(TA

/4

LITRE OF

BLES

A, B ANDC)

ig. 16

F

Warning

The exhaust gas ducts must not be in contact with or close to inflammable
material and must not pass through building structures or walls made of
inflammable material.
When replacing an old appliance, the flue system must be changed.

Ø 60/100 mm

Fig. 17

Installation without extension

Important

Ensure that the flue is not blocked.
Ensure that the flue is supported and
assembled in accordance with these
instructions.

162

Installation with extension

slope

slope 5 mm per metre

Fig. 18

19

12.1 Fitting the coaxial flue (Ø 60/100 Horizontal)

CO
1X SI
1X EL
2X WALL SEALS (

X FLUE PIPE INCLUDING TERMINAL (1 METRE - 60/100)

1

NTENTS

LICONE

BOW

:

O-RING(60mm)

(90O)

I

NTERNAL &EXTERNAL)

1X FLUE CLAMP
1X SC

REWS

1x Seal

Once the boiler has been positioned on the wall, insert the elbow into the socket and rotate to the required position. N

OTE

: It is

possible to rotate the elbow 360oon its vertical axis.
Using the flue clamp, seals and screws supplied
The 1 metre horizontal flue kit (3318073) supplied is suitable for an exact

easure the distance from the face of the external wall to the face of the flue elbow

M

(Fig 19) secure the elbow to the boiler.

X dimension of 815mm.

X - Fig 17),this figure must now be

(

subtracted from 815mm, you now have the total amount to be cut from the plain end of the flue.
Draw a circle around the outer flue and cut the flue to the required length taking care not to cut the inner flue, next cut the inner

flue ensuring that the length between the inner and outer flue is maintained.

(Fig 19).

e.g.

X = 555mm
815-555 = 260mm (Length to be cut from the plain end of the flue).

Once cut to the required length, ensure that the flue is free from burrs and reassemble the flue. If fitting the flue from inside of
the building attach the grey outer wall seal to the flue terminal and push the flue through the hole, once the wall seal has
passed through the hole, pull the flue back until the seal is flush with the wall. Alternatively, the flue can be installed from
outside of the building, the grey outer seal being fitted last.

Clamp

Screws

Seal

Fig. 19

12.2 Fitting the 5” Flue (Ø 80 / 125 Horizontal/vertical)

Should the flue require extending, the flue connections are push fit, however, one flue bracket should be used to secure each
metre of flue.

OTE:SEE

N

PAGE

24 FOR

MAXIMUM

Once the boiler has been positioned on the wall, it is necessary to insert the
vertical flue runs into the boiler flue socket (not supplied with flue kit -

Push the adaptor onto the boilers flue connection, grease the seals then add extensions or elbows as required, secure the
adaptor, using the clamp and screws provided.

AND MINIMUM FLUE RUNS

.

Ø 80/125 adaptor (FIG. 20) for both horizontal and

Part No 3318095).

To fit extensions or elbows it is first necessary to ensure that the lip seal is fitted correctly into the inner flue, once verified, it is
simply necessary to push them together, no clamps are necessary to secure the flue components.

Before proceeding to fit the flue, ensure that the maximum flue length has not been exceeded (See the tables on Page 23) and
that all elbows and bends have been taken into consideration, the maximum flue length is 10 metres, for each additional 90
elbow 1 metre must be subtracted from the total flue length, and for each 45o0.5 metres must be subtracted from the total flue
length (the height of the vertical adaptor and a 45obend can be seen in Fig. 21 and a 90obend in Fig. 22).

N

OTE: DO NOT CUT THE VERTICAL FLUE KIT.

20

o