C&M Minima HE User guide

Manufacturers N° Model Type Gas Council N°
3650007.31 Minima HE 24 Nat 47 - 980 - 33
3650008.31 Minima HE 30 Nat 47 - 980 - 34
3650009.31 Minima HE 35 Nat 47 - 980 - 35
CONDENSING WALL HUNG COMBINATION BOILER
Heating and Instantaneous Domestic Hot Water - Fanned Flue system
Installation, Servicing and Operating Instructions
Countryof destination GB IE
cMMiinniimmaaHHEE

2
These instructions are suitable for the Minima HE boilers :
Do not forget the Log Book!
Chaffoteaux & Maury supports Benchmark, the heating industry code to ensure the correct installation, commissioning and
servicing of domestic central heating systems.
To The Householder
Make sure that your installer completes Section 24 of this manual (page 60) . 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. 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 (page 61).
In the unlikely event of any problems with your boiler or system you should first contact your installer. If your installer cannot
resolve the problem he should telephone our national service helpline.
A charge may be made if Chaffoteaux & Maury Service is called out to resolve a non-product related fault.
Your statutory rights are not affected.
CUSTOMER CARE
Chaffoteaux & Maury, as a leading manufacturer of domestic and commercial water heating appliances is committed to
providing high quality products and a high quality after sales service.
Advice on installation or servicing can also be obtained by contacting the Chaffoteaux Technical and Customer Service
Departments at High Wycombe.
TECHNICAL DEPARTMENT CUSTOMER SERVICE DEPARTMENT
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
GUARANTEE
The manufacturer`s guarantee is for 24 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 and if the
appliance is not serviced in accordance with manufacturers instructions and the Service Interval Record (Section 25, page 60)
is not completed after the first year. To assist us in providing you with an efficient after sales service, please return the guaran-
tee 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
your boiler Log Book. 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.
To The Installer
As part of the commissioning of this appliance it is necessary to complete Section 24 of this manual (page 60) 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, page 60) and the appliance service history (Section 25, page 61).
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.
This instruction booklet is especially designed for appliances installed in the UK and the Republic of Ireland

3
CUSTOMER CARE
Page
Guarantee ............................................................................................................................................................2
Statutory Requirements .......................................................................................................................................2
Contents ...............................................................................................................................................................3
INTRODUCTION ..................................................................................................................................................4
USER INSTRUCTIONS ........................................................................................................................................5
1CONTROL PANEL...........................................................................................................................................5
2 HOW TO USE ..................................................................................................................................................6
3 MAINTENANCE ...............................................................................................................................................7
4 GUARANTEE...................................................................................................................................................7
5 PRACTICAL INFORMATION...........................................................................................................................7
6 FITTING AND SETTING THE TIME CLOCK...................................................................................................8
6.1 FITTING THE MECHANICAL AND DIGITAL CLOCKS ..........................................................................8
6.2 SETTING THE MECHANICAL CLOCK ...................................................................................................9
6.1 SETTING THE DIGITAL CLOCK...........................................................................................................10
INSTALLERS’ INSTRUCTIONS.........................................................................................................................12
7 DESCRIPTION...............................................................................................................................................12
8DIMENSIONS ................................................................................................................................................13
9HYDRAULIC DATA .......................................................................................................................................13
10 INSTALLATION REQUIREMENTS................................................................................................................14
11 INSTALLING THE BOILER............................................................................................................................17
12 CONNECTING THE FLUE.............................................................................................................................19
12.1 FITTING THE COAXIAL FLUE (Ø 60 / 100 HORIZONTAL) ................................................................ 20
12.2 FITTING THE 5” FLUE (Ø 80 / 125 HORIZONTAL/VERTICAL) .......................................................... 20
12.3 FITTING THE VERTICAL FLUE (Ø 60 / 100)....................................................................................... 22
12.4 FITTING THE TWIN FLUE (Ø 80 / 80) ................................................................................................ 23
13 ELECTRICAL CONNECTIONS .................................................................................................................... 26
14 COMMISSIONING AND TESTING ............................................................................................................... 28
14.1 INITIAL PREPARATION ....................................................................................................................... 28
14.2 INITIAL START-UP............................................................................................................................... 28
14.3 ADJUSTING THE CO2 ......................................................................................................................... 29
14.4 GAS CONVERSION ............................................................................................................................. 29
14.5 ADJUSTING THE MAXIMUM HEATING POWER ............................................................................... 29
14.6 FITTING THE EXTERNAL SENSOR.................................................................................................... 29
14.7 EXTERNAL SENSOR SET-UP............................................................................................................. 29
14.8 ADJUSTING THE PARALLEL SHIFT................................................................................................... 30
14.9 COMPLETION ...................................................................................................................................... 30
14.10 OPERATIONAL CHECKS .................................................................................................................... 30
14.11 INSTRUCTING THE END USER.......................................................................................................... 30
15 FITTING THE CASING ................................................................................................................................. 31
16 SEQUENCE OF OPERATION...................................................................................................................... 32
16.1 CENTRAL HEATING MODE ................................................................................................................ 32
16.2 DOMESTIC HOT WATER MODE......................................................................................................... 33
17 ADJUSTMENTS AND SETTINGS ................................................................................................................ 34
Contents

4
SERVICING INSTRUCTIONS
18 REPLACEMENT OF PARTS ........................................................................................................................ 41
18.1 To Gain General Access....................................................................................................................... 41
18.1.1 Removing the front panel...................................................................................................................... 41
18.1.2 Lowering the control panel.................................................................................................................... 41
18.2 Access to the Combustion Chamber .................................................................................................... 42
18.2.1 Removing the combustion chamber front panel ................................................................................... 42
18.2.2 Removing the burner ............................................................................................................................ 43
18.2.3 Removing the detection electrode ........................................................................................................ 43
18.2.4 Removing the ignition electrode............................................................................................................ 43
18.2.5 Removing the fan.................................................................................................................................. 44
18.2.6 Removing the gas valve........................................................................................................................ 44
18.2.7 Removing the heat exchanger .............................................................................................................. 45
18.2.8 Removing the spark generator.............................................................................................................. 45
18.3 ACCESS TO THE WATER CIRCUIT ................................................................................................... 46
18.3.1 Drain down............................................................................................................................................ 46
18.3.2 Removing the 3 way valve.................................................................................................................... 46
18.3.3 Removing the float of the flow switch ................................................................................................... 46
18.3.4 Removing the secondary heat exchanger ............................................................................................ 47
18.3.5 Removing the pump.............................................................................................................................. 47
18.3.6 Removing the pressure relief valve ..................................................................................................... 48
18.3.7 Removing the domestic expansion vessel............................................................................................ 48
18.3.8 Removing the overheat thermostat....................................................................................................... 48
18.3.9 Removing the temperature sensors (NTC’s) ........................................................................................ 48
18.3.10 Removing the pressure gauge.............................................................................................................. 49
18.3.11 Removing the DHW flow switch............................................................................................................ 49
18.4 ACCESS TO THE CONTROL SYSTEM .............................................................................................. 49
18.4.1 Removing the PCB’s............................................................................................................................. 49
18.4.2 Removing the fuses .............................................................................................................................. 50
18.5 CONNECTING THE EXTERNAL SENSOR ......................................................................................... 50
19 INCORRECT FUNCTION ............................................................................................................................. 51
20 MAINTENANCE INSTRUCTIONS ................................................................................................................ 52
20.1 GENERAL REMARKS.......................................................................................................................... 52
20.2 CLEANING THE PRIMARY EXCHANGER .......................................................................................... 52
20.3 OPERATIONAL TEST .......................................................................................................................... 53
21 SHORT SPARES LIST ................................................................................................................................. 54
22 NOTES.......................................................................................................................................................... 55
23 TECHNICAL DATA ....................................................................................................................................... 56
24 BENCHMARK COMMISSIONING CHECKLIST ........................................................................................... 59
25 SERVICE INTERVAL RECORD ................................................................................................................... 60
INTRODUCTION
The MINIMA HE 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.

5
USER INSTRUCTIONS
1. Control panel
30
26 27
25
34
28
Fig. 1
33
31 32
29
Control panel (Fig. 1)
25.- Display
26.- On/off push button and power on indicator light
27.- Yellow indicator - Comfort button
28.- Reset push button and red indicator lock-out light
29.- DHW control knob and temperature setting
30.- Central Heating control knob and temperature setting
31.- Menu key
32.- Reducing key
33.- Increasing key
34.- Setting key
Connecting bracket
Taps shown in Open position (Fig. 2)
39 : Gas service tap
40 : Water service tap
41 : Central heating flow isolating valve
42 : Central heating return isolating valve
43 & 44: Filling taps
45 : Filling loop
Fig. 2
41
42
43 44
45 39 40
16

6
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 45 (fig. 2) is attached, open the filling taps 43 &
44, 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 26 Power ON
3. Open the gas tap 39(fig.2).
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
attempts. (please refer to Section 19 Incorrect Function, page 47)
2. How to use
Time setting
You can set the time by using the keys underneath the display.
By pressing the setting key for more than 5 seconds the hours willl begin to flash. You can now set the correct hour by using the
+ and - keys. By pressing the setting key will make the minutes flash. You can set the minutes by using the + or - keys.
Pressing the setting key once more will store the set time.
NOTE:THIS IS NOT A TIMER FOR CH CONTROL
DHW mode
Turn the control knob 29 between min and max. During the adjustment,
flashes.
The flashing goes on for a while after the adjustment, then the display indicates
the time.
Heating mode
Turn the control knob 30 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
symbol
BURNER ON and output level
The flame digits will increase or decrease depending on the output. Flame digit
Burner ON
+
+
OPEN CLOSED
When DHW is drawn, the
display indicates the following:
When the boiler is operating in ‘comfort
mode’ the display indicates the following:
Comfort mode
To activate the comfort mode it is necessary to press the comfort button, this
will be indicated by a yellow light. The comfort mode has priority over any other
heating request.
There are two settings for the comfort mode (they can be adjusted in the
parameters menu, see Section 17 Adjustments and Settings):
1. As soon as DHW is drawn, the secondary heat exchanger is kept warm for
30 mins.
2. As soon as DHW is drawn, the secondary heat exchanger is kept warm
permanently.
comfort

7
Stand-by mode
Turn the control knobs 29 and 30 to the OFF position to deactivate the DHW
and Heating. Leave the ON/OFF button On with the green light on.
During the stand-by mode the display indicates the time, anti-seizing and anti-
freezing will be active.
Switch OFF
Press the button ON/OFF.
During this mode the boiler will not operate, but is still connected to the mains.
Anti-freezing mode
Turn the control knobs 29and 30 to OFF to switch off the heating and hot water
functions. Leave the On/Off button on with the green light on.
When the anti-freeze comes on, the corresponding code is displayed with the
snowflake pictogram .
The two possible codes are 05 (anti-freeze - pump only) or 06 (anti-freeze -
burner).
05: When this mode is active, the circulating pump operates for one
minute and the diverter valve switches every 23 hours.
Caution: in this mode, the room thermostat anti-freeze function is
inoperative.
Boiler anti-freeze function: the pump starts at 8°C
the burner starts at 3°C
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 Log Book.
The manufacturer`s guarantee is for 24 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 and if the
appliance is not serviced in accordance with manufacturers instructions and the Service Interval Record (Section 25, page 60)
is not completed after the first year. To assist us in providing you with an efficient after sales service, please return the guaran-
tee registration card enclosed with the boiler without delay.
3. Maintenance
4. Guarantee
Cleaning the casing and control panel
Should it be necessary to clean the casing and control panel. do so only with a soft damp cloth, do not use any spray polishes
or cleaners.
Precaution to avoid freezing
We recommend you contact your installer or local service centre for further advice on the actions to be taken to avoid the
system freezing.
• DHW system
Turn off the main cold water supply and drain the boiler :
- Open a hot water tap
- Unscrew the cold water inlet tail
• CH system
Chose one of the following solutions :
- 1) Drain completely the Central Heating system
- 2) Protect the Central Heating system with anti freeze chemical products and verify the concentration periodically
- 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.
5. Practical information

8
6. Fitting and setting the time clock
6.1 Fitting the mechanical and digital time clocks
To fit the integral time clock it is necessary to proceed as
follows;
- Isolate the electical supply to the appliance;
- Remove the front panel as described in Section 18.1.1;
-Remove the plastic cover on the right hand side (Fig. 3)
and pull out the 4 wires (Fig. 4);
-Connect the time clock wires as follows;
MECHANICAL MODEL (Fig. 5)
Red Wire - Contact 1
Black Wire - Contact 2
Black Wire - Contact 3
Grey Wire - Contact 5
NOTE: THE TWO BLACK WIRES ON CONTACTS 2 & 3 CAN BE REVERSED
DIGITAL MODEL (Fig. 6)
Red Wire - Contact 1
Black Wire - Contact 2
Grey Wire - Contact 3
NOTE:SECOND BLACK WIRE IS NOT CONNECTED.
- Push the clock back into the panel and refit the casing
panel (Fig. 7).
54321
GBR
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7

9
3
6
9
12
Fig. 8
1. General layout
The mechanical clock covers a 24 hour period. Each tappet represents 15 minutes A(Fig. 9). An override switch is located on
the clock B(Fig 9).
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 Bto the symbol to control the central heating by the clock. Put the switch Bto «I» to select
permanent operation or to «0» to turn the central heating off permanently.
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
A
C
B
Fig. 9
6. Fitting and setting the time clock (continued)
6.2 Setting the mechanical clock

10
P
r
o
g
.
h
m
Day
Manual switch
Summer and
winter time
setting
Reset
Enter
weekday/s
Enter
the hours
Week-
days
flash
Enter
minutes
Enter
switching
times
Imput
time
Operating the time switch
The steps marked with the symbol “ ” are necessary to carry out a switching program.
Preparing for Operation
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 “ ” key pressed down
During the summer time period press the +/- 1h key once.
Enter the hour using the “h” key
Enter the minutes using the “m” key
Enter the day using the “Day” key
1 = “Monday”..............7 = Sunday
- Release the “ ” key.
6.3 Setting the Digital Clock
6. Fitting and setting the time clock (continued)

11
Entering the switching times
You have 20 memory Iocations available. Each switching time takes up one memory location.
Keep pressing the “Prog” key until a free memory location is shown in the display “– –:– –”.
Programme ON or OFF with the “ ” key:
“ ”= 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 “ ” key, otherwise select the
day(s) it is to be carried out by using the “Day” key.
When the day seIection is left bIank, the programmed switching instruction operates at the same time every day
12 3 4 5 6 = Monday – Saturday
12 3 4 5 = Monday – Friday
67 =Saturday – Sunday
Selection of single days: 1 = Mon. .............. 2 =Tues.
Save the switching time with the “ ” key.
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 “
” key, 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 “ ” key. 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” key displays the programmed switching times until the first free memory location appears in the display “– – :
– –”.
If you now press the “Prog” key once again, the number of free memory Iocations will be displayed, e.g. “18”. If all memory
locations are occupied, the display “00” appears.
Changing the programmed switching times
Press the “Prog” key repeatedly until the switching time you want to change is displayed. You can now enter the new data. See
point “Entering the switching times”.
Notes on storing switching times:
If you end your entry of the switching times by pressing the “Prog” key, then the switching time you have entered will be stored
and the next memory location displayed.
In addition, a complete switching command is stored automatically after around 90 seconds provided no other key is pressed.
The time switch then enters the automatic operating mode and displays the current time again.
Deleting individual switching times
Press the “Prog” key repeatedly until the switching time you wish to delete is shown in the display. Then set to “– –” using the “h”
or “m” key and keep the “ ” key pressed down for around 3 seconds. The switching time is now erased and the current time is
displayed.
AM / PM time display
If you press the “+/-1h” and “h” keys at the same time, the time display switches into the AM/PM mode.
6. Fitting and setting the time clock (continued)

12
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.- Siphon
12.- Silencer
13.- Electrical box
14.- Pump
15.- Secondary heat exchanger
16.- Pressure gauge
17.- Three way valve
18.- Automatic air vent
19 - Domestic hot water flowswitch
20.- Main exchanger inlet thermistor
21.- Main exchanger outlet thermistor
22.- Overheat sensor
23.- Central heating pressure relief valve
1
2
3
4
5
6
8
12
13
14
30
26 27
25
34
28
INSTALLER INSTRUCTIONS
7
Fig. 10
Fig. 12
15
20
21
10
17
9
Fig. 11
33
31 32
19
18
22
16
29
25.- Display
26.- On/off push button and power on
indicator light
27.- Yellow indicator - Comfort button
28.- Reset push button and red indicator
locking light
29.- DHW control knob and temperature
setting
30.- Central Heating control knob and
temperature setting
31.- Menu key
32.- Reducing key
33.- Increasing key
34.- Setting key
42
7. Description
11
23

13
8. Dimensions
9. Hydraulic data
440
450 mini pour entretien
Fig. 13
54 54 54 54
JKLMN
I
JKLMN
32
296
141
289
21
720
691,5
121,5
I
172,5
4,7
All dimensions in mm
With packaging :
24 kW : 37 kg
30 kW : 40 kg
35 kW : 41 kg
390
minimum space required 450
ISafety valve C/H and condensate
J Heating flow
K D.H.W. outlet
L Gas supply
M Cold water inlet
N Heating return
The boiler is fitted with an automatic by-pass as standard.
The graph (Fig. 9) shows the developmentof 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.
Maximum volume of expansion vessel: 6 litres.(24 kW)
7 litres.(30 / 35 kW)
Pressure: 1 bar.
The volume of the expansion vessel in a pressurised
appliance varies according to:
- the average operating temperature in °C
- 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.
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
C litre
Central heating initial pressure when cold (in bar)
System capacity chart
296 (24 kW)
360 (30/35 kW)
Fig. 14
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0200 400 600 800 1000 1200 1400
Pressure (bar)
flow rate (l/hr)
Pressure (bar)
flow rate (l/hr)
Pump Head Graph (15/50)
Pump Head Graph (15/60)

14
Reference Standards
In the United Kingdom, the installation and initial start up of
the boiler must be by a CORGI Registered installer in
accordance with the installation standards curently 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
the appliance must be carried out by a Competent Person in
accordance with the current edition of I.S.813 “Domestic Gas
Installations” and the current Building Regulations, reference
should also be made the the current ETCI rules for electrical
installation.
The installation of this appliance must be
in accordance with 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, “Elelectricity at Work
Regulations 1989” and in the Republic of
Ireland with the current edition of I.S. 813
and the Local Building Regulations (IE).
C.O.S.H.H.
Materials used in the manufacture of this
appliance are non-hazardous 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 5546:1990 Installation of hot water supplies for
domestic purposes
BS 5440-1:2000 Flues
BS 5440-2:2000 Air Supply
BS 5449:1990 Forced ciculation hot water systems
BS 6798:2000 Installation of gas fired hot water
boilers of rated input not exceeding
70kW
BS 6891:1989 Installation of low pressure gas pipe up
to 28mm
BS 7671:2001 IEE Wiring Regulations
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
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 alkalin 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
such as an outhouse or closed lean-to.
Condensing boilers have a tendency to form a plume of water
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
buildings in the vicinity and consideration must also be given to
adjacent boundaries, openable windows should also be taken
into consideration when siting the flue.
The minimum acceptable clearances are shown below:
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
NOTE: THE FLUE MUST NOT BE INSTALLED UNDER A CAR PORT
ROOF OR IN A PLACE LIKELY TO CAUSE A NUISANCE.
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. 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. Ensure that
the pipe size is adequate for demand including other gas
appliances on the same supply.
E
E
Fig. 15
10. Installation requirements

15
Electrical Supply
The appliance requires an earthed 230V - 50 Hz supply and
must be in accordance with current I.E.E. It must also be
possible to be able to completely isolate the appliance
electrically. Connection should be via a 3 amp fused double-
pole isolating switch with contact separation of at least 3 mm
on both poles. Alternatively, a fused 3 Amp. 3 pin plug and
unswitched socket may be used, provided it is not used in a
room containing a bath or shower. It should only supply the
appliance.
The boiler is suitable for sealed systems only. The maximum
working pressure for the appliance is 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 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. When the
installation and filling are completed, flush the system while
cold, refill, turn on the Central Heating System (Section 2
page 6) and run it until the boiler reaches its operating
temperature. The system must then be immediately flushed
through. The flushing procedure must be in line with BS
7593:1992 code of practice for treatment of water in
domestic hot water central heating systems.
During this operation the use of a central heating flushing
detergent is compulsory, whose function is to disolve any
foreign matter that may be in the boiler and system following
the flushing procedure.
Substances different from these could create serious
problems to the pump or other components.
The use of an inhibitor is also compulsory to prevent
corrosion (sludge) damaging the boiler and system.
Failure to carry out this procedure will invalidate the
appliance warranty.
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. (Section 13
Electrical Connections - page 27).
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 2.5oand must be inserted by at least 50mm
into a suitable acid resistant pipe - e.g. plastic waste or
overflow pipe. The condensate discharge pipe must have a
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) 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.
ii) Connecting into the waste system of the building such as
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.
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 installed
externally then it should be kept to a minimum and be
insulated with a waterproof insulation and have a continuous
fall. The total length of external pipe used should not exceed
3 metres.
Some examples of the type of condensate terminations can
be found on page 13.
10. Installation requirements (continued)

16
10. Installation requirements (continued)
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
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

17
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
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. 16 and unscrew the two clamp locking bolts Aand remove the casing (Fig. 17).
Place the boiler on the wall on the hanging bracket (Fig. 18).
NOTE: THE APPLIANCE MUST NOT BE FITTED ON A COMBUSTIBLE WALL SURFACE.
Connecting the boiler to the system
- Remove the boiler casing as described in Section 18.
- Push in the tabs “P” (Fig. 18) on either side of the boiler and pivot the electrical box forward to gain access to the valve
connections
- Remove the 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 for gas connection
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 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 pipe from the siphon (11 Fig. 11) should be connected to a drain as described
in the relevant Brittish regulations.
Pay special attention to not bend the condensate silicone drain pipe such as the flow will be interrupted. Please use exclusively
drain pipe material compatible with condensate products. (refer to BS 6798 : 2000)
The condensate flow can reach 2 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 (11 Fig. 11) must be filled with water. Before fitting the flue l onto the
boiler, pour 1/4 litre of water in the exhaust pipe as shown in Fig. 20.
Instructions on fitting the flue can be found in Section 12.
IMPORTANT!!
Use only the specific condensation flue kit supplied by C&M.
11. Installing the boiler

18
1
2
AA
Fig. 19
Fig. 16
11. Installing the boiler (continued)
Fig. 17
P
P
Fig. 18

Fig. 20
5
Ø 60/100 mm
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
concentric flue system.
NOTE:SEE PAGE 24 FOR MAXIMUM AND MINIMUM FLUE RUNS (TABLES A, B AND C)
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.
Important
Ensure that the flue is not blocked.
Ensure that the flue is supported and
assembled in accordance with these
instructions.
12. Connecting the Flue
Fig. 21

150 mm
* slope 5 mm per metre
150 mm
* slope
Installation without extension
Installation with extension
Fig. 22
118
Level
Level
IMPORTANT!!
BEFORE CONNECTING THE FLUE,ENSURE THAT 1/4 LITRE OF
WATER HAS BEEN POURED INTO THE EXHAUST CONNECTION
TO FILL THE CONDENSATE TRAP (FIG. 20). SHOULD THE
TRAP BE EMPTY THERE IS A TEMPORARY RISK OF FLUE
GASSES ESCAPING INTO THE ROOM.

Fig. 23
12.2 Fitting the 5” Flue (Ø 80 / 125 Horizontal/vertical)
Screws
Clamp
Seal
CONTENTS:
1XSILICONE O-RING (60mm)
1XELBOW (90O)
2XWALL SEALS (INTERNAL &EXTERNAL)
1XFLUE PIPE INCLUDING TERMINAL (1 METRE - 60/100)
1XFLUE CLAMP
1XSCREWS
1x Seal
Once the boiler has been positioned on the wall, insert the elbow into the socket and rotate to the required position. NOTE: It is
possible to rotate the elbow 360oon its vertical axis.
Using the flue clamp, seals and screws supplied (Fig 23) secure the elbow to the boiler.
The 1 metre horizontal flue kit (3318073) supplied is suitable for an exact X dimension of 815mm.
Measure the distance from the face of the external wall to the face of the flue elbow (X - Fig 21), 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 23).
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.
12.1 Fitting the coaxial flue (Ø 60/100 Horizontal)
Should the flue require extending, the flue connections are push fit, however, one flue bracket should be used to secure each
metre of flue.
NOTE:SEE PAGE 19 FOR MAXIMUM AND MINIMUM FLUE RUNS.
Once the boiler has been positioned on the wall, it is necessary to insert the Ø80/125 adaptor (FIG. 24) for both horizontal and
vertical flue runs into the boiler flue socket (not supplied with flue kit - Part No 3318095).
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.
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 19) and
that all elbows and bends have been taken into consideration, the maximum flue length is 10 metres, for each additional 90oelbow
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. 25 and a 90obend in Fig. 26).
NOTE:DO NOT CUT THE VERTICAL FLUE KIT.