Chaffoteaux & Maury Mira System CF User manual

C
COMBINATION BOILER
Heating only (system)
Heating + sanitary hot water together (system plus)
Open flue System
Installation and Operating Manual
GB
TEMP
MODE
MAN
AUTO
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Page
12 - controls................................................................................................................ 14
13 - operation ............................................................................................................. 15
14 - maintenance........................................................................................................ 16
15 - evacuation sensor for combustion products ........................................................ 16
16 - warranty............................................................................................................... 17
17 - practical advice ................................................................................................... 17
18 - technical specification ......................................................................................... 18
19 - operating faults.................................................................................................... 19
Page
1 - description........................................................................................................... 3
2 - dimensions .......................................................................................................... 4
3 - water specifications............................................................................................. 4
4 - installation requirements ..................................................................................... 5
5 - fitting the boiler.................................................................................................... 6
6 - electrical connections.......................................................................................... 7
7 - starting up ........................................................................................................... 8
8 - fitting the casing .................................................................................................. 10
9 - gas conversion .................................................................................................... 11
10 - fault codes .......................................................................................................... 12
11 - points to note....................................................................................................... 13
Installer’s instruction
User’s instruction
Contents

3
INSTALLER’S INSTRUCTION
Fig.1
1
2
4
5
6
12
3
10
8
9
11
1.- sheet steel frame with expansion vessel
2.- overflow safety device
3.- draught diverter
4.- copper main heat exchanger
5.- combustion chamber
6.- multigas burner comprising:
• a removable injector manifold
• a ignition electrode
• a flame detection electrode
7.- gas valve assembly comprising:
• two safety solenoid valves
• a control solenoid valve
8.- circulating pump with automatic vent
9.- overheat sensor
10.- main heat exchanger inlet thermistor
11.- main heat exchanger outlet thermistor
12.- electronic control unit
15.- ignitor
16.- central heating pressure relief valve
19. - heating circuit pressure gauge
20. - ON/OFF push button and ON indicator light
21.- sanitary accumulation start button and tank
temperature setting button
22.- heating function ON and heating temperature
adjustment knob
23.- heating temperature and operating fault indicator
24.- orange burner operating indicator light
25.- reset push button and red locking indicator light.
1. Description
Fig.3 20 21
23
25
22
24
19
C
15
16
Fig.2
7
(system plus)

4
440
450 mini pour entretien
Fig.4
54 54 54 54
JKLMN
I
JKLMN
32
296
21
720
691,5
121,5
I
172,5
175,3
ø125
1,80 m mini du sol
289
4,7
Measurements in mm
Weight with packaging:
24 kW: 29 kg
Fig. 5
Fig. 6
Water content diagram.
Pf = Cold pressure in bar
C = Installation capacity in litres
The boiler is fitted with an automatic by-pass as standard.
The graph (fig. 5) shows the development of the pressure
available in relation to flow (on exit from the boiler).
To ensure correct operation, the minimum flow of the appliance
must be 300 l/h. (Thermostatic taps closed).
Capacity of the installation.
The boiler is fitted with an expansion vessel.
Maximum volume of expansion vessel: 6 litres.
Inflation Pressure: 0,7 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 installation and the expansion vessel axis).
The minimum cold filling pressure of the installation is 0,7 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.
0
4
3
2
1
5
6
100 200 800 700
600
500
400
300 900 10001100 1200 l/h
mCE Débit mini (robinets thermostatiques fermés)
Pression disponible
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
390
450 min. for maintenance
Pressure available
Minimum flow rate with the heating thermostatic valves
Heating circuit pressure when cold (bar)
Maximum system capacity (litres)
2. Dimensions
3. Hydraulic characteristics
ISafety valve outlet
JHeating flow and tank
KTank backflow (system plus)
LGas inlet
MCold water supply
NHeating backflow
▲

5
4.1 REGULATIONS
PRIVATE HOMES
STATUTORY REQUIREMENTS FOR INSTALLATION AND
MAINTENANCE
Installation and maintenance of the equipment must be car-
ried out by a qualified professional in accordance with cur-
rent legislative texts and state of the art, including:
- law of 2 August 1977
Technical and Safety rules applicable to combustible gas
and liquefied gas petroleum installations located inside
buildings or outbuildings
- law of 5 February 1999 modifying the law of 2 August
1977
after replacing a boiler with an identical one (same align-
ment and area as the previous equipment), the installer
must make out a "model 4" certificate of conformity
- Standard DTU P 45-204 -
gas installations (previously DTU N°61-1 - Gas
Installations - April 1982 + additional clause N°1 of July
1984)
- Regional Health Regulations
Protection of the drinking water network:
• articles 16-7 and 16-8 of the Regional Health Regulations
require the installation to have a CB type disconnection
device with various non-controllable pressure zones,
conforming to the functional requirements of French
Standard NF P 43-011, to prevent heating water being
returned to the drinking water network
• an NF backflow preventer is fitted in the boiler's tap fit-
tings unit
• French Standard NF C 15-100 - Low voltage electrical
installations - Rules
PUBLIC BUILDINGS
STATUTORY REQUIREMENTS FOR INSTALLATION
Installation and maintenance of the equipment must be car-
ried out by a qualified professional in accordance with cur-
rent legislative texts and state of the art, including:
- fire safety and panic control regulations for public
buildings:
a) General requirements
for all equipment:
• GZ articles
Combustible gas and liquefied gas petroleum installa-
tions
• CH articles
heating, ventilation, refrigeration, air conditioning, steam
and domestic hot water production
b) Special requirements for each type of building with
public access (hospitals, shops, etc.)
Recommendation:
if the area is exposed to the risk of lightning (isolated ins-
tallation at the end of an electricity line, etc.) install a light-
ning conductor
Our warranty is subject to this requirement.
4.2 BOILER LOCATION
- install the boiler near a duct for removing the
products of combustion
- never install the boiler above hot-plates or ovens or in
general over any equipment producing greasy vapours
which could make the boiler dirty and affect its operation
- prepare a wall and mountings able to support the weight of
the boiler (weight: approx. 35 kg)
- take precautions to reduce noise
4.3 DESIGNING AND CARRYING OUT THE INSTALLA-
TION
Domestic hot water circuit (system plus)
- Avoid excessive loss of charge in preheating circuit
- if the water hardness is more than TH 25, install a water
softener
- if a non-return valve is present, a device allowing for
expansion is required (available as an option)
See domestic hot water technical directive (DTU)
Central heating circuit
Circulation flow rate:
- when working out the measurements, be careful to main-
tain a minimum flow rate of 300 l/h, with the thermostats
closed
Precautions against corrosion
Operating faults due to corrosion are likely to occur if the
system is built with components made of different materials.
To prevent such problems it is advisable to use a corrosion
inhibitor.
Take every precaution to prevent the treated water from
becoming corrosive.
Old installation:
- fit a sediment trap to the lowest point on the backflow and
treat the system correctly
Recommendation:
- fit bleed valves on all radiators and to high points of the
installation; also fit drain cocks to low points
Evacuation of burnt gas
See DTU 24-6 and technical rules
This boiler must only be connected to a duct with a natural
draught
Connection is provided for fitting a 125 mm Ø pipe for 24
kW inside the outlet neck of the draught diverter.
Fit a drip pot to prevent any condensation from the chimney
falling into the boiler.
4. Installation requirements

6
Fig. 8
1
2
Fig. 7
AA
- place the paper installation jig in the selected position on the wall
- fit the hanging bracket
- bring the water pipes and the electrical connection to the locations shown on the fitting template
- remove the 2 locking screws Awhich secure the front panel (fig. 7)
- remove the front panel
- offer the boiler up to its bracket and allow it to drop into position while pressing on it (fig. 8)
- ensure water and gas connections using the various seals required (rubber seal for gas) and position the metal filter in the
heating backflow connection.
Safety valve drain hole 16 MUST be connected to a waste water pipe.
finish by connecting the chimney:
- use a connecting pipe or elbow specially approved for gas (99.5 % pure aluminium or stainless steel)
- connection is provided to fit the pipe or elbow inside the outlet neck of the boiler's draught diverter
Cleaning the appliance
Once the water has been connected, it is essential to clean the installation with an appropriate product (dispersing agent) to
remove filings, solder, and various factory oils and greases.
The use of any solvent or aromatic agent (petrol, oil etc.) is forbidden.
We recommend treating the whole heating system as soon as it is commissioned to maintain a pH between
9 and 9.5.
5. Fitting the boiler
31. Central heating flow isolating valve and tank
32. Tank backflow (system plus)
33. Gas service tap
34. Cold water supply
35. Central heating return isolating valve
16
Fig. 9
31 32 33 35
34

7
Location of connections:
- the 230 V supply lead and room thermostat inputs
must be fitted on the wall at the height specified
on the fitting template
• the boiler is supplied with 230 V by a twin and
earth lead supplied with the appliance
• room thermostat (TA): prepare a free length of
at least 50 cm where the TA lead meets the
wall
Access to the boiler room thermostat connec-
tion:
- the room thermostat is connected behind the boi-
ler control unit
Regulations:
- in accordance with the regulations, an all-pole iso-
lating device with a contact opening gap of at least
3 mm must be installed in the boiler's stationary
power supply installation
- the boiler must be connected to a fixed junction
box using the cable supplied
230 V and earth connection via the lead provided at J1
Important: If the power supply cable is damaged, it should be replaced by the manufacturer, the after-sales service or
a person with a similar status, in order to avoid potential danger.
Room thermostat connection
When it leaves the factory, the boiler is set to operate without a room thermostat: a shunt S is fitted on connector D. A room
thermostat can be connected to this connector
- lower the electronic control unit by releasing the side locking pins P, to gain access to the rear side
- remove screws Band cover C(fig. 10)
The room thermostat connection can then be accessed.
- remove connector D
- connect the thermostat in place of shunt S
- reconnect connector D
Connector J12 shown (fig. 11) is ready to connect an optional programmer (refer to the relevant instructions if necessary).
6. Electrical connections
P1
P2
ON OFF
A1
A2
A3
A4
B1
B2
B3
B4
P3
S
T


D
J12
J1
J12
EJ1
P1
A1
A2
A3
A4
B1
B2
B3
B4

E
Cylinder
thermistor
System System Plus
Shunt between
1 and 2
Shunt between
2 and 3
thermistor tank
Fig. 11
230 V 2P
+ E lead
B
C
P
P
Fig.10

8
PRESSURISATION (fig. 12)
Heating circuit and tank:
- open cold water tap 34
- check that the heating flow 31, heating backflow 35 and tank backflow 32 taps (compy system plus) are open
- open filling tap 36
- close the tap again when the needle of pressure gauge 19 (fig. 3) is at the pressure specified in § 3
- drain the installation and re-establish the pressure
Gas circuit
- open gas tap 33
- flush the gas circuit
- check the whole gas line for leaks
SETTINGS
The boiler is supplied with all the adjusting knobs set to OFF (fig. 13) and the potentiometers turned fully clockwise. It is
possible to adjust these settings if required.
In that case, it is necessary to open the electronic control unit.
Switch off the boiler, remove the casing and open the unit by pressing the 2 tabs P(fig. 10). The adjusting knobs are on the
electronic circuit board behind blanking cover E(fig. 11).
- A1 is used to set the Heating Anti-cycle Time (HAT) period to 30 seconds or 3 minutes
HAT: period during which restarting the burner is prohibited during a heating regulation phase
- A2 allows the speed of the pump in heating mode to be selected (high speed or adaptive speed)
- A3 is used to adjust the heating temperature setting to 40 °C irrespective of the position of heating temperature adjustment
knob 22 (fig. 3)
- A4 enables operation in modulating heating mode or all or nothing mode
- B1 allows the duration of post-circulation in heating mode to be adjusted
- B2 allows the domestic hot water time delay (TIC) to be adjusted
-B3 not used
- B4 not used
N.B. After a power cut or a board reset, the HAT is cancelled for 3 minutes.
- P1: potentiometer for reducing the heating power (see table page 9)
- P2: not used
- P3: not used
Once adjustments have been made, replace blanking cover E, close the control unit cover and refit the casing.
7. Operating
Fig. 12
31 32 33 35
34
36

9
P1
P2
ON OFF
A1
A2
A3
A4
B1
B2
B3
B4
P3
Pompe Grande VitessePompe Petite Vitesse
Anticycle 3 min
Fonctionnement Modulant
Tempo Débistat Sanitaire 1,5 sec Tempo Débistat Sanitaire 0 sec
Célectic
OFF
ON
Anticycle 30 s
Fonctionnement TOUT OU RIEN
Consigne chauffage à 40 C Consigne chauffage variable de 35 à 85 C
Post circulation 30 s Post circulation 3 mn
Factory settings
Fig.13
Burner gas output setting
The values shown in the tables below are given for information purposes for a nominal gas distribution pressure, to allow any
adjustments to the boiler heating output according to the requirements of the appliance.
They cannot be used to calculate the precise regulated output of the water heater.
Adaptive speed pump
ON OFF
ON/OFF operation
Heating setting to 40 °C
Modulating Operation
Adjustable heating setting 35 to 85 °C
30 s anticycle 3 min anticycle
7. Operating (continued)
Post-circulation 30 s. Post-circulation 3 min.
24 kW CF
Gas G20 PROPANE BUTANE
Working P.
(kW)
Pressure
plate
(mm CE)
10 16 49 38
12 38 102 78
16 65 171 131
20 96 256 195
24 133 355 270
TIC 3 min. TIC 30 s.
High speed pump

10
Fitting the casing
Remove the protective film on the casing:
- offer up the casing (fig. 14)
- engage hooks Nin notches R
operation 1
- fit the top of the panel in place
- screw in the 2 front panel securing screws A
Note: it is essential to refit both locking bolts A
Fig.15
A
8. Fitting the casing
1
N
R
R
N
Fig.14

11
When changing to a gas different from the one for which the boiler is equipped, you should replace the parts supplied with the
conversion kit and adjust the gas valve in accordance with the method described below.
Adjusting the nominal output
• remove the protective cap from the adjusting
screws (fig. 16).
• remove screw 2and fit a tube connected to a
pressure gauge to the pressure connection point
(fig. 16).
• start the boiler at maximum output (hot water tap
on full) and maximum temperature setting.
• turn nut 3using an 8-mm open-ended spanner
(fig. 17) while holding screw 4still and adjust the
pressure to the value shown in the table
“nominal output table.”
Adjusting the minimum output
• disconnect a variable solenoid valve power
supply cable (fig. 18)
• turn screw 4using a 5-mm open-ended spanner
while holding nut 3 (fig. 18) and adjust the
pressure to the value shown in the table
“minimum output table.”
• when the adjustment is finished, refit screw 2
and test for leaks.
• put the protective cap back on the adjustment
screws.
2
Fig.16
3
Fig.17
4
Fig.18
Nominal output Minimum output
mm CE G 20 G 30 G 31
24 kW CF 133 270 355
mm CE G 20 G 30 G 31
24 kW CF 16 38 49
9. Gas conversion

12
If the equipment has an operating fault, one or more LEDs (23) flash according to the type of fault listed in the table below.
10. Fault codes - Information
= LED off
= LED blinking
LED Coding FAULT DESCRIPTION INFORMATION
30 40 50 60 70 80
1Locked - overheating.
3Locked by ignition fault.
6Frost protection.
7Input water circulation absent.
8Input water circulation fault.
11 Main exchanger outlet sensor open.
12 Main exchanger outlet sensor short-circuited.
13 Main exchanger inlet sensor open.
14 Main exchanger inlet sensor short-circuited.
15 External sensor open.
16 External sensor short-circuited.
17 Gas overflow fault (TTB).
18 Disappearance of current flame.
28 Clima Manager "Module Counter" memory card faulty.
29 Clima Manager room sensor open.
30 Clima Manager room sensor short-circuited.
31 Fault on display board.
32 Communication problem between main boards and display.

13
By-pass valve assembly direction
11. Particular characteristics

14
INSTRUCTIONS FOR THE USER
Control panel (fig. 20)
19. - heating circuit pressure gauge
20. - ON/OFF push button and ON indicator light
21.- domestic hot water function ON and hot water
temperature adjustment knob
22.- heating function ON and heating temperature
adjustment knob
23.- heating temperature and operating fault indicator
24.- orange burner operating indicator light
25.- reset push button (reset) and red locking indicator light
Taps and valves (fig. 21)
31. Central heating flow isolating valve and tank
32. Tank backflow (system plus)
33: Gas tap
34: Cold water supply tap
35: Central heating return isolating valve
36: Filling tap
16: Heating safety valve
Fig.20
Fig. 21
12. Controls
20 21
23
25
22
24
19
C
(system plus)
31 32 33 35
16
34 36

15
Starting up
1. check that the appliance's general gas shut-off tap is open and that the boiler is supplied with power.
2. check that there is sufficient pressure in the heating circuit: pressure gauge needle at least 1.2 bar with 1.7 bar at max. cold
3. open gas inlet tap 33 (fig. 21)
Your boiler is now ready to operate.
Important
When the appliance is operated after a prolonged period of inactivity, the presence of air in the gas flues may hinder the first
attempts at igniting the gas.
See § 20 Operating faults
To obtain heating and hot water (system plus):
Press ON/OFF button 20; the button lights up green.
- turn knob 21 to preheat the sanitary tank (compy system plus). This button allows you to adjust the hot water
temperature. While the tank is pre-heating, LEDs 23 light up 2 by 2 in sequence.
- turn knob 22 to authorise heating ignition. This knob allows you to adjust the water temperature in the heating circuit
according to seasonal requirements. Indicator 23 displays the temperature.
• Turn knob 22:
- towards Max. in cold weather
- towards Min in mild weather
Furthermore, if your home is fitted with a room thermostat, set it to the desired indoor temperature.
N.B. Orange indicator light 24 lights up every time the burner ignites
Stopping the heating
- Set knob 22 to the OFF position. The boiler then produces only hot water.
Setting to pilot
- Set knobs 21 and 22 to the OFF position, leaving button 20 (fig. 20) lit. The function remains active unless the boiler freezes.
Turn off the boiler completely
- press push button 20 and the light goes out
- turn off the electricity supply to the boiler heater.
- shut off the gas supply by turning tap 33 (fig. 21)
13. Operation
Note:
In certain cases of installation it is possible that, after reheating the tank (system plus), the pipes (and possibly a radiator) may
heat up slightly. To prevent this, simply close heating inlet tap
31 ( fig. 21).
Remember to re-open it at the start of the heating season, when you switch the heating back on by pressing button
22 (fig. 20)

16
Current legislation requires a mandatory annual service of your water heater.
Once a year, have it checked by a qualified professional.
Annual service contract formats may be suggested to you by service providers for all boiler servicing. Contact your gas fitter or
our commercial services.
The manufacturer's warranty, which covers manufacturing faults, should not be confused with servicing operations.
This type B11BS boiler is fitted with a sensor (located in the draught diverter) which shuts off the gas supply if there is a
problem with the evacuation of combustion products.
This device puts the boiler in safety shutdown status, with indicator lights (22) 40 and 80 flashing.
Automatic restart occurs after an interval of approximately 15 minutes.
Important: if the boiler shuts down repeatedly, the exhaust fault must be corrected by getting a specialist to check that the
chimney is empty because there is probably a total or partial blockage of the combustion products evacuation chimney. Check
that the fresh air flow rate required for combustion is in fact available.
Warning: this flue gas checking device must not be disconnected or have unwarranted work carried out on it. If it needs to be
replaced, only original parts may be used.
14. Maintenance
15. Overflow safety device

17
Your boiler is under warranty. The warranty certificate specifies the warranty conditions: check that the detachable section of
this certificate has been returned to Chaffoteaux & Maury.
A qualified professional must have installed, adjusted and commissioned your installation for the warranty to be valid. This
assures you that the fitter complied with the installation manual and that regulatory and safety conditions have been met.
Your first boiler technical inspection will be carried out free of charge at your request by a qualified Chaffoteaux & Maury tech-
nical station professional.
• Pump degumming system
With the boiler switched on (indicator light 20 lit), the circulating pump operates for 1 minute after it has been stopped for
longer than 23 hours, irrespective of the boiler's operating mode, to prevent the pump from sticking.
Precautions to take in freezing conditions
We recommend that you contact your gas fitter or After-Sales service, who will advise you of the measures to take according to
your circumstances.
• Domestic hot water circuit (system plus)
The hot water circuit is drained after closing the appliance's water counter and cold water tap:
- open a hot water tap
- Drain the tank
• Heating circuit
Take one of the following steps:
- 1) drain the circuit of the heating appliance
- 2) protect the heating installation with an antifreeze product. Periodically checking the level of protection provided by this
antifreeze is an additional warranty requirement.
- 3) allow your installation to run at low load by setting the room thermostat to the antifreeze position (between 5 and 10°C).
- 4) leave the power to the boiler on. It is fitted with an antifreeze device which activates the circulation pump, then the
burner.
16. Warranty
17. Practical advice

18
These boilers are designed to operate with natural gas or LPG. If the type of gas is changed, only a qualified professional is
authorised to carry out this operation.
18. Technical specifications
Model 24 kW CF
Heating power Pn 7,5 - 24 KW
Variable tank pre-heating power Pn max 24 kW
Class I - type B11BS (natural draught/chimney/overflow safety device)
Category II 2E+3+
Fresh air flow rate required for combustion V 48 m3h.
Combustion products mass flow rate M 20 g/s
Average temperature for combustion products 120 °C
Associated BACD tank capacity 120 150
Specific domestic hot water flow rate (ΔT: 30 K) D 22,2 l/mn 24,6 l/mn
Minimum central heating circuit flow rate 300 I/h.
Maximum heating circuit pressure Pw max 3 bar
Adjustable heating flow temperature 35 to 85 °C
Adjustable domestic hot water temperature (system plus) 40 to 60 °C
Electric voltage 230 volt, single phase - 50 Hz
Electrical power consumption 90 W
Electrical protection IP X4D
Nominal gas flow rate (15 °C-1013 mbar) Gas rate max Gas rate mini
Qn 26,0 kW 9 kW
G 20 34,02 MJ/m3at 20 mbar Vr 2,75 m3/h 0,95 m3/h
G 30 45,6 MJ/kg a 28-30 mbar Vr 2,05 kg/h 0,71 kg/h
G 31 46,4 MJ/kg at 37 mbar Vr 2,02 kg/h 0,70 kg/h
Nat Prop
Feeder marking Marking NAT Gas 125 LPG Gas 77
Injector size in 1/100 of mm 125 77
No. of injectors 12 12

19
If all these actions are unsuccessful, call a qualified professional.
Fault Cause Solution
The boiler doesn’t start No gas, no water or no electricity Control gas, water and electrical
supply, fuses…
Air in the gas pipe Follow procedure in chapter 8
Room thermostat switched off Set up the room thermostat
Red indicator alight
Wait for a few minutes
Press on reset button 25 (fig.20) the red
led turn off and the boiler attempts to re-
light.
If red indicator alight too frequently,
please call your localfaîtes service centre.
Noises in CH system Air presence in CH system or. Insufficient
pressure
Purge of air the system and rise up the
system pressure (chapter 7)
19. Operating faults

420010057900 - 09/2006
MTS sa
Le Carré Pleyel
5 rue Pleyel
93521 SAINT DENIS Cedex
Tél. [phone]
Fax [phone]
www.chaffoteaux-maury.fr
C