After Sales Service Guide

(1)

After Sales Service Guide

300029718-001-A 28/09/2012

(2)

2

Use of this guide is reserved for qualified professionals

Symbols used

Any intervention on the appliance and heating equipment

must be carried out by a qualified engineer.

Abide by prevailing local regulations.

For Belgium: Any work on the gas block must be carried out

by a factory technician.

Caution danger Risk of injury and damage to equipment. Attention must be paid to the warnings on safety of persons and equipment

Specific information Information must be kept in mind to maintain comfort

(3)

3

1

2

3

4

5

6

7 1. PRESENTATION - SPECIFICATIONS

Contents: page 6

2. OPERATING PRINCIPLE

Contents: page 16

3. PRODUCT EVOLUTION

Contents: page 32

4. TROUBLESHOOTING DIAGRAMS

Contents: page 38

5. INSTALLATION - COMMISSIONING

Contents: page 54

6. CONTROLS AND SETTINGS

Contents: page 76

7. ELECTRICAL DIAGRAMS

(4)

(5)

5

1

PRESENTATION

SPECIFICATIONS

(6)

6

1 1. Presentation . . . 7

1.1 The various models . . . 7

1.2 Performance (in accordance with RT 2005 for France) . . . 9

1.3 Strong points . . . 9

1.4 Control panel options . . . 10

1.5 Boiler options . . . 11

2. Specifications . . . 12

2.1 Technical specifications . . . 12

2.2 Characteristics of domestic hot water production . . . 12

2.3 Location of the data plate . . . 13

(7)

7

1 1. Presentation

1.1 The various models

Boiler Type of

connection Model Useful output range (kW)

Heating only

Chimney MS 24 9.3 - 24

Flue gas outlet* MS 24 FF 9.3 - 24

Heating and micro-storage domestic hot water production

Chimney CMV (1) MS 24 MI MS 24 MI VMC(1) 9.3 - 24 9.3 - 24

Flue gas outlet* MS 24 MI FF 9.3 - 24

Heating + DHW

Boiler with integrated DHW tank (40 litres)

Chimney MS 24 BIC 10.4 - 23.3

Flue gas outlet* MS 24 BIC FF 10.4 - 24

* Horizontal forced flue: Diameter 60/100 mm or Vertical forced flue: Diameter 80/125 mm + adapter (1) for France only

(8)

8

1

* Horizontal forced flue: Diameter 60/100 mm orVertical forced flue: Diameter 80/125 mm + adapter Heating + DHW BS80 calorifier

The DHW calorifier can be placed to the left or right of the boiler.

Chimney _{(MS 24 + BMR 80)}MS 24 / BS80 9.3 - 24

Flue gas outlet* _{(MS 24 FF+ BMR 80)}MS 24 FF/ BS80 9.3 - 24

Heating + DHW BS130 calorifier DHW tank placed under the boiler.

Chimney _{(MS 24 + SR 130)}MS 24 / BS 130 9.3 - 24

Flue gas outlet* _{(MS 24 FF+ SR 130)}MS 24 FF / BS 130 9.3 - 24

(9)

9

1 1.2 Performance (in accordance with RT 2005 for France)

1.3 Strong points

• Compact, user-friendly boiler thanks to its accessibility and the easy dismantling of all its components: all components can be accessed from the front.

• Combustion chamber:

- Primary exchanger (heating body) in copper pipes with fins, coated with aluminium silicone paint, enhancing its resistance to heat.

- Atmospheric gas burner with stainless steel burner trains. • Electronic ignition and flame control by ionization,

• Modulating gas valve with dual safety solenoid valve, • Control panel:

- Electronic control panel with easy to use, direct access digital display,

- Display of the error code on the digital display console to facilitate troubleshooting, - The control panel is used as standard to manage a direct circuit and a DHW circuit,

- Optional regulation of the heating circuit by adding a programmable or non-programmable room temperature thermostat (wire- or radio-controlled) and/or an outside temperature sensor,

- Anti-blocking function for the pump and the reversal valve. • Compact water unit (Hydroblock):

- In brass for the MS 24, MS 24 FF versions

- In composite material for the MS 24 MI, MS 24 MI FF, MS 24 VMC, MS 24 BIC and MS 24 BIC FF versions - 2-speed heating pump with automatic air vent

- Automatic bypass

- Motorised heating / DHW reversal valve fitted to the return - Low water pressure switch

- Boiler and disconnector drain valve - Heating circuit safety valve (3 bar)

- Safety valve on the DHW circuit (7 bar - For MS 24 BIC and MS 24 BIC FF boilers) - Pressure gauge

- The filters on the heating and DHW circuits are housed in detachable cartridges - Stainless steel plate exchanger for DHW production (MI and BIC versions) - Turbine flow switch for measuring the DHW flow rate (MI and BIC versions) • 6-litre expansion vessel (Heating circuit) - all versions excepted BIC

• BIC Versions: 7,5-litre expansion vessel (Heating circuit) • Extraction fan and air pressure switch (FF Versions) • Downdraught thermostat (Chimney versions, Version VMC*) • Full antifreeze protection (heating and DHW circuits) • High energy efficiency:

- *** efficiency class for the FF versions

- ** efficiency class for the chimney and VMC versions

- N0x 3 class in accordance with pr EN297 A3 for the chimney versions, in accordance with EN483 for the FF versions. • The IPX5D protection rating allows the boiler to be installed in a kitchen or bathroom.

* Version VMC: for France only.

Generator type:

- MS 24 (FF): Heating only

- MS 24 MI (FF, VMC): Heating and domestic hot water. Boiler with < 10 litres of additional storage integrated in the secondary circuit. - MS 24 BIC (FF) : Heating and domestic hot water (Boiler with

integrated DHW tank > 10 litres)

Boiler type: Low temperature atmospheric gas boiler

Burner: Atmospheric with no fan (Chimney versions); Atmospheric with fan (FF Versions).

Energy used:Natural gas (All models) or Propane (except MS 24 MI VMC)

Combustion evacuation:Chimney, Flue gas outlet or CMV.

Min. return temperature:20 °C Min flow temperature: 30 °C EC certificate reference:

MS... : 51BT3644/45DR/ED03 MS... FF : 51BT3642/43DR/ED03 MS... VMC : 51CL4020/21DR/ED03.

(10)

10

1 1.4 Control panel options

AD137 / AD200 / AD247 / AD248

AD269

AD140

Programmable, wire-controlled room thermostat - Package AD137 / AD247

Wireless settable ambient thermostat - Package AD200 / AD248

Programmable, wire-controlled room thermostat 230 V - Package AD269

Non settable ambient thermostat - Package AD140.

Domestic hot water sensor - Package AD250

The DHW sensor is used for the priority control of the temperature and the

programming of domestic hot water production by an accumulation tank.

Outside sensor - Package HX31

The outside temperature sensor can be used on its own or in combination with the

room thermostats to regulate the heating according to the outside temperature.

88 01 Q02 9 MCX _Q0 00 9 88 01 Q00 3d et 4*(F8 M S_Q 000 5

(11)

11

1 1.5 Boiler options

For the other hydraulic connection options, refer to the current product catalogue.

Stove fittings accessories, specific to MS boilers

DHW expansion vessel (For MS 24 BIC - MS 24 BIC FF)- Package HX26 Capacity : 2 litres.

Used to prevent water loss caused by expansion when reheating the DHW tank.

DHW calorifiers:

- BMR80: Package EE53. Wall-hung DHW tank - 80 litres - Connection kit BMR80 / MS24 : Package HX33.

- SR130: Package EE22. Floor-standing DHW tank - 130 litres - DHW sensor included. - Connection kit SR130 / MS24 : Package HX32.

Hyrdaulic connection kit for a solar circuit with directional thermostatic valve - Package HX23 (For MI versions only)

This kit contains all the pipes needed to connect the boiler to a solar DHW tank, including the directional thermostatic valve and the cold water isolating valve. It makes it possible to combine a solar system with a boiler with micro-storage domestic hot water production, thus handling regulation of the solar DHW system according to the needs of the user.

Filling kit with pressure gauge - Package HX27.

To be connected between the heating flow valve at one end and the domestic cold water inlet on the boiler's hydraulic connection plate at the other.

Propane conversion kit

- for: MS 24, MS 24 FF, MS 24 MI, MS 24 MI FF - Package HX28 - for: MS 24 BIC, MS 24 BIC FF - Package HX29

Horizontal terminal Alu Diameter 60/100 mm - Package DY908

Horizontal terminal Alu Diameter 80/125 mm, Length 730 mm - Package CX119 Vertical terminal Alu Diameter 80/125 mm - Package DY735 (Black) or DY736 (Red) Condensates adapter/recuperator - From diameter 60/100 to 80/125 mm (Alu) - Package DY909

Condensate collector - Diameter 60/100 mm (Alu) - Package DY910

Bi-flow boiler connection kit - Package HX30

3 CE pipe connection kit Diameter 60/100 mm - Package DY911

MS _Q00 30 BMR80 SR 130 MC R_ QG0 010 86 66 QG0 43A MS _Q 00 06 M S_ Q 00 29 M S_Q 00 04 G000258 G000256 DY908 DY736 DY909 DY910 G000255 G000259 G000257 DY911

(12)

12

1 2. Specifications

2.1 Technical specifications

(1) for France only - (2) For VMC versions: No operation on propane.

2.2 Characteristics of domestic hot water production

Conditions of validity of the table: Ambient temperature 20 °C, Cold water temperature 10 °C, Primary hot water temperature

85°C.

(1) for France only

Boilers MS _24/BS...24 _{24 FF/BS...}24 FF 24 MI

24 MI VMC(1) 24 MI FF 24 BIC 24 BIC FF Generator type

MS 24 (FF): Heating only MS 24 (FF)/BS:Heating and DHW with separate domestic

hot water tank

Heating and domestic hot water: Boiler with 10 litres of additional storage integrated

in the secondary circuit

Heating and integrated domestic hot water tank Nominal useful output Pn

(heating and DHW modes) kW 24 24 24 24 23.3 24

LHV efficiency at 100% Pn - 70 °C at 30% Pn - 40 °C

%

% 91.290.2 92.990.4 91.290.2 92.990.4 91.089.8 92.990.6 Nominal water flow rate at Pn, ∆T = 20 K m3/h 1.03 1.03 1.03 1.03 1.00 1.03

Stand-by losses to ∆T = 30 K W 183 59 183 59 199 99

Minimum useful output (heating and DHW modes) kW 9.3 9.3 9.3 9.3 10.4 10.4

Manometric height available for the heating circuit mbar 175 175 175 175 230 220

Water content l 3 3 3.5 3.5 5 5

Gas flow rate at Pn - Natural gas H or L - Propane m 3_/h Kg/h 2.78/3.23 2.04 2.73/3.172.00 2.78/3.23 2.04(2) 2.73/3.17 2.00 2.73/3.172.00 2.73/3.172.00

Required depressurisation at the nozzle mbar 0.5 - 0.5 - 0.5

-Mass flue gas flow rate at Pn Kg/h 0.014 0.020 0.014 0.020 0.021 0.017

Electrical specifications

Power supply voltage V AC 230 230 230 230 230 230

Auxiliary electrical power (Ex circulating pump) at

Pn W 5 55 5 55 5 60

Electrical power circulating pump at Pn / Pmin W 75 / 75 75 / 75 75 / 75 75 / 75 75 / 75 75 / 75

Electrical protection index IPX5D IPX5D IPX5D IPX5D IPX5D IPX5D

Other characteristics Weight (empty) kg 28 32 29 33 51 61 Boilers MS 24 MI FF24 MI 24 MI VMC(1) 24 BIC 24 BIC FF 24 / BS80 24 FF / BS80 24 FF / BS13024 / BS130

Tank capacity (Domestic hot water) l - 40 40 80 130

Power exchanged kW 24 23.3 24 24 24

Flow in 10 min. at ∆T =30 K l/10 mm - 180 180 210 260

Flow per hour at ∆T =35 K l/h 590 573 590 590 590

Specific flow at ∆T=30 K

(in accordance with EN 13203-1) l/min 12.0 17.7 17.7 21.0 26.0

Auxiliary electrical power (In DHW mode) W 80 80 80 80 80

Losses through the outer casing at ∆T = 45 K W - 69 69 62 73

(13)

13

1 2.3 Location of the data plate

The data plate provides important information on the boiler: serial number, model, gas category, etc...

2.4 Characteristics of the heating pumps

The following graphs show the manometric height at various outputs.

If flow noises can be heard in the heating circuit, reduce the speed of the pump. First of all, vent the heating system.

If the circulation in the radiators is too low or the radiators do not heat up completely, increase the speed of the pump (Bleed the radiators).

Pump GRUNDFOS UPSO 15-50 (2-speed

pump)

H: Manometric height available with the pump,

at ∆T=20 K.

Q: Water flow l/h

MS 24 BIC (FF) MS 24 (FF) - MS 24 MI ... (FF)

MS 24 MI - MS 24 MI FF - MS 24 MI VMC

(14)

14

(15)

15

2

OPERATING PRINCIPLE

(16)

16

2 1. Description . . . 17

1.1 Control panel . . . 17

1.2 Main parts . . . 18

2. Operating principle diagram . . . 22

2.1 Boiler MS 24 . . . 22

2.2 Boiler MS 24 MI - MS 24 MI VMC . . . 23

2.3 Boiler MS 24 FF . . . 24

2.4 Boiler MS 24 MI FF . . . 25

2.5 Boiler MS 24 BIC . . . 26

2.6 Boiler MS 24 BIC FF . . . 27

(17)

17

2 1. Description

1.1 Control panel

Info mode Alternating display:

Description of the keys: `Press button for 5 seconds: The Info mode is active.

The display shows the code A..., alternating with the value of the parameter.

`Press the (+/-) keys on side to get an instant display of the following information:

This function is active for 3 minutes.

`To interrupt the "INFO" function in advance, press the button again. The display shows ESC.

Operating mode selection key :

- Stop (Display: OFF) / Antifreeze protection active - DHW heating only: Only domestic hot water production

is ensured, the heating is switched off. (Display: Boiler temperature + ) - Heating only

(Display:Boiler temperature + ) - Heating and domestic hot water

(Display: Boiler temperature + + )

Reinitialisation (RESET)

Press the Reset button for 2 seconds Info mode: Parameter display:

Info mode (see opposite) A00 Domestic hot water temperature (°C) _{If there is no DHW preparation, the display shows 99.} / : Heating temperature setting A01 Outside temperature (if the optional outside temperature _{sensor is connected).}

If the sensor is not connected, a full stop is displayed. / : Setting the domestic hot water temperature

Display: A02 Current modulation value ( 100% = 230 mA on natural _{gas G20/G25 - 100% = 310 mA on propane G31).}

Operating in heating mode A03 Percentage of maximum boiler output (%) in heating mode.

Operating in DHW mode

Flame present A04 Heating temperature setting (°C)

If an outside temperature sensor is connected, display of the heating gradient (Kt:See section 6, chapter 6.2). Igniter fault

ERROR

Reinitialisation A05 Current boiler temperature (°C)

No water / Pressure lower than 0.5 bar A06 Domestic hot water set point temperature (°C) Display,Depending on the situation:

- Measured temperature - Set temperature - Operating modes - Failure code

A07 Not used.

A08 Domestic hot water flow (l/min x 10) - For versions MI and BIC only

A09 Last error which occured.

(18)

18

2 1.2 Main parts

MS 24

MS 24 FF

1 Control panel (in tilted position) 2 Low water pressure switch 3 Gas valve (with diaphragm) 4 Gas pressure measurement point 5 Ignition/ionization electrode

6 Atmospheric gas burner with stainless steel burner _trains 7 Boiler temperature sensor

8 105 °C safety thermostat

9 Air pressure switch (FF versions only)

10 MS 24 FF : Air/flue gas connection Ø 60/100 mm _{MS 24 : Flue gas nozzle Ø 125 mm} 11 Venturi (FF versions only)

12 Extractor fan (FF versions only) 13 Combustion chamber

14 Primary exchanger (Water / flue gases) 15 Flame inspection window

16 Expansion vessel 6 litres

17 2-speed heating pump with automatic air vent 18 Heating / DHW inversion valve

19 Disconnector 20 Filling valve 21 Pressure gauge

22 Heating circuit safety valve

(19)

19

2 MS 24 MI FF

6 Atmospheric gas burner with stainless steel burner _trains 7 Boiler temperature sensor

8 105 °C safety thermostat 9 Air pressure switch

10 Air/flue gas connection Ø 60/100 mm 11 Venturi

12 Extractor fan 13 Combustion chamber 14 Primary exchanger 15 Flame inspection window 16 Expansion vessel 6 litres

17 Stainless steel plate exchanger for the production of micro-storage DHW

20 Disconnector 21 Filling valve (Blue) 22 Pressure gauge

(20)

20

2 MS 24 MI

MS 24 MI VMC

6 Atmospheric gas burner with stainless steel burner trains 7 Boiler temperature sensor

8 105 °C safety thermostat 9 Draught diverter

10 Flue gas nozzle Ø 125 mm 11 Combustion chamber 12 Primary exchanger 13 Expansion vessel 6 litres

14 Stainless steel plate exchanger for the production of micro-storage DHW

17 Disconnector 18 Filling valve (Blue) 19 Pressure gauge

21 Domestic hot water outlet temperature sensor

(21)

21

2 MS 24 BIC FF

MS 24 BIC

1 Control panel (in tilted position) 14 Flame inspection window

2 Pressure gauge 15 Primary exchanger (Water / flue gases)

3 Heating / DHW inversion valve 16 Stainless steel plate exchanger for DHW production

4 Gas valve (with diaphragm) 17 DHW tank

5 2-speed heating pump with automatic air vent 18 Tank temperature sensor

6 Disconnector 19 Safety valve on the DHW circuit

7 Atmospheric gas burner with stainless steel burner trains 20 DHW load pump

8 Air pressure switch (FF versions only) 21 Flow switch (domestic water)

9 Venturi (FF versions only) 22 Expansion vessel 7.5 litres (Heating circuit)

10 Extractor fan (FF versions only) 23 Boiler temperature sensor

11 105 °C safety thermostat 24 Heating circuit safety valve

12 Ignition/ionization electrode 25 Low water pressure switch

13 Combustion chamber

(22)

22

2 2. Operating principle diagram

2.1 Boiler MS 24

1 Automatic bypass 2 Low water pressure switch 3 Heating / DHW inversion valve 4 Reversal valve motor

5 Gas valve (with diaphragm) 6 Gas ramp (with injection nozzles) 7 Boiler temperature sensor 8 Ignition/ionization electrode 9 105 °C safety thermostat

10 Primary exchanger (Water / flue gases) 11 Draught diverter cut-off

12 Flue gas thermostat - 70 °C

13 Atmospheric gas burner with stainless steel burner trains

14 Expansion vessel 6 litres

15 2-speed heating pump with automatic air vent 16 Non-return valve

17 Drain cock (Boiler) 18 Pressure gauge

19 Heating circuit safety valve 20 Disconnector

Heating flow

Primary flow to DHW tank Gas inlet

Domestic cold water inlet (Filling valve) Heating return

(23)

23

2 2.2 Boiler MS 24 MI - MS 24 MI VMC

1 2-speed heating pump with automatic air vent 2 Non-return valve

3 Heating / DHW inversion valve 4 Reversal valve motor

5 Pressure gauge 6 Filter (Heating circuit) 7 Disconnector 8 Filling valve (boiler)

9 Filter (Domestic cold water inlet) 10 Flow switch (domestic water)

11 Domestic hot water outlet temperature sensor 12 Non-return valve (on automatic bypass) 13 Low water pressure switch

14 Drain cock (boiler) 15 Heating circuit safety valve

16 Plate heat exchanger (Water / Water) 17 Gas valve (with diaphragm) 18 Gas ramp (with injection nozzles) 19 Heating flow temperature sensor 20 Ignition/ionization electrode 21 105 °C safety thermostat

22 Primary exchanger (Water / flue gases) 23 Draught diverter cut-off

24 Flue gas thermostat MS 24 MI : 70 °C MS 24 MI VMC : 57 °C

25 Atmospheric gas burner with stainless steel burner trains

26 Expansion vessel 6 litres Heating flow

Domestic hot water outlet Gas inlet

(24)

24

2 2.3 Boiler MS 24 FF

1 Automatic bypass 2 Low water pressure switch 3 Heating / DHW inversion valve 4 Reversal valve motor

5 Gas valve (with diaphragm) 6 Gas ramp (with injection nozzles) 7 Heating flow temperature sensor 8 Ignition/ionization electrode 9 105 °C safety thermostat

10 Primary exchanger (Water / flue gases) 11 Flue gas header

12 Extractor fan 13 Venturi

14 Positive pressure outlet 15 Negative pressure outlet 16 Air pressure switch

17 Atmospheric gas burner with stainless steel burner _trains 18 Expansion vessel 6 litres

19 2-speed heating pump with automatic air vent 20 Non-return valve

21 Drain cock (Boiler) 22 Pressure gauge

23 Heating circuit safety valve 24 Disconnector

Heating flow

Primary flow to DHW tank Gas inlet

(25)

25

2 2.4 Boiler MS 24 MI FF

1 2-speed heating pump with automatic air vent 2 Non-return valve

3 Heating / DHW inversion valve 4 Reversal valve motor

5 Pressure gauge 6 Filter (Heating circuit) 7 Disconnector 8 Filling valve (boiler)

9 Filter (Domestic cold water inlet) 10 Flow switch (domestic water)

11 Domestic hot water outlet temperature sensor 12 Non-return valve (on automatic bypass) 13 Low water pressure switch

14 Drain cock (boiler) 15 Heating circuit safety valve

16 Plate heat exchanger (Water / Water) 17 Gas valve (with diaphragm) 18 Gas ramp (with injection nozzles) 19 Heating flow temperature sensor 20 Ignition/ionization electrode 21 105 °C safety thermostat

22 Primary exchanger (Water / flue gases) 23 Flue gas header

24 Extractor fan 25 Venturi

26 Positive pressure outlet 27 Negative pressure outlet 28 Air pressure switch

29 Atmospheric gas burner with stainless steel burner _trains 30 Expansion vessel 6 litres

Heating flow

Domestic hot water outlet Gas inlet

(26)

26

2 2.5 Boiler MS 24 BIC

1 Filter (Heating circuit) 19 Tank temperature sensor

2 Pressure gauge 20 Anode

3 Heating / DHW inversion valve 21 DHW load pump

4 Gas valve (with diaphragm) 22 Flow switch (domestic water)

5 2-speed heating pump with automatic air vent 23 Drain cock (DHW tank)

6 Non-return valve 24 Safety valve on the DHW circuit

7 Disconnector 25 Expansion vessel DHW circuit (Option)

8 Filling valve (boiler) 26 Heating circuit safety valve

9 Gas ramp (with injection nozzles) 27 Drain cock (boiler)

10 Draught diverter cut-off 28 Low water pressure switch

11 Flue gas thermostat 29 Non-return valve (on automatic bypass)

12 105 °C safety thermostat 30 Plate heat exchanger (Water / Water)

13 Primary exchanger (Water / flue gases)

14 Ignition/ionization electrode Heating flow

15 Atmospheric gas burner with stainless steel burner trains Domestic hot water outlet

16 Heating flow temperature sensor Gas inlet

17 DHW tank (Stainless steel) Domestic cold water inlet (Filling valve)

(27)

27

2 2.6 Boiler MS 24 BIC FF

1 Filter (Heating circuit) 21 DHW tank (Stainless steel)

2 Pressure gauge 22 Expansion vessel 7.5 litres (Heating circuit)

3 Heating / DHW inversion valve 23 Tank temperature sensor

4 Gas valve (with diaphragm) 24 Anode

5 2-speed heating pump with automatic air vent 25 DHW load pump

6 Non-return valve 26 Flow switch (domestic water)

7 Disconnector 27 Drain cock (DHW tank)

8 Filling valve (boiler) 28 Safety valve on the DHW circuit

9 Gas ramp (with injection nozzles) 29 Expansion vessel DHW circuit (Option)

10 Flue gas header 30 Heating circuit safety valve

11 Air pressure switch 31 Drain cock (boiler)

12 Negative pressure outlet (Not used) 32 Low water pressure switch

13 Positive pressure outlet 33 Non-return valve (on automatic bypass)

14 Venturi 34 Plate heat exchanger (Water / Water)

15 Extractor fan Heating flow

16 105 °C safety thermostat Domestic hot water outlet

17 Primary exchanger (Water / flue gases) Gas inlet

18 Ignition/ionization electrode Domestic cold water inlet (Filling valve) 19 Atmospheric gas burner with stainless steel burner trains Heating return

(28)

28

2 2.7 Description of the boiler operating

Description of the ignition phase

- The regulator controls the opening of the gas valve: the modulator opens the valve at 50 mA (G20/G25) or 70 mA (G31) - The regulator simultaneously controls the appearance of sparks

on the ignition electrode.

- During the safety time, the modulating valve opens with a gradient of 36 mA/s (G20/G25) or 48 mA/s (G31).

Safety time: 5 seconds.

- If a flame is detected after 3 seconds, the regulator continues to supply current to the modulator until the maximum value of 230 mA (G20/G25) or 310 mA (G31), with a gradient of 112 mA/s. - The regulator then moves on to the next operation:

- heating function (if no DHW requirement). The regulator releases modulation after 20 seconds (between 50 and 230 mA (G20/G25) or 70 and 310 mA (G31), in accordance with the heating set point.

- full load DHW function (230 mA on G20/G25 or 310 mA on G31) then flame modulation phase in accordance with the DHW set point.

- If no flame is detected, the boiler switches to safety shutdown after 3 re-ignition attempts and displays the error code E01.

Description of the operating modes

The key is used to select one of the following operating modes:

OFF Stop / Antifreeze protection: (Display: OFF).

Antifreeze protection only is activated, no other requests are taken into account.

DHW heating only: Only domestic hot water production is ensured, the heating is switched off. The antifreeze

protection function is activated.(Display: Heating flow temperature + )

If the CTN sensor on the DHW circuit breaks down, hot water production continues nevertheless. The temperature will be controlled by the heating sensor.

Heating only: heating is handled (The antifreeze protection function is activated).

(Display: Heating flow temperature + )

+ Heating and domestic hot water: the boiler provides domestic hot water and the heating is on. (The antifreeze

protection function is activated)

(Display: Heating flow temperature + + )

Antifreeze protection (Heating circuit and Domestic hot water circuit)

The boiler's electronic controller has an antifreeze protection function which trips the burner to reach a boiler temperature close to 30°C when the boiler temperature is lower than 5°C.

The antifreeze protection function is activated if:

- The boiler is electrically powered up, - The gas supply is available,

- The pressure switch measures a pressure in the circuit higher than or equal to 0.5 bar, - The boiler is not in safety lockout.

Post-circulation of the heating pump (In heating mode): When the boiler is no longer required (e.g. room thermostat),

post-circulation of the pump runs for 180 seconds.

Post-circulation of the heating pump (In DHW mode):

When there is no DHW request, post-circulation of the pump runs for 30 seconds.

For BIC versions: When there is no DHW request, post-circulation of both pumps runs for 30 seconds.

Pump anti-block function (unclogging)

In heating mode, if there is no heating request, the pump runs automatically for 10 seconds every 24 hours. This function is only available if the boiler is electrically powered up.

Reversal valve anti-block function

If there is no heating request, the reversal valve runs a full automatic cycle every 24 hours. This function is only available if the boiler is electrically powered up.

A: Ignition flow B: Flame detection

(29)

29

2

Safety devices:

- Air pressure switch (FF Versions): This device prevents burner operation when the flue gas circuit is blocked or presents an anomaly (flue gas extraction terminal blocked, venturi blocked, fan blocked, venturi-pressure switch connection interrupted). In this case, the boiler shuts down and displays the error code E03.

- Flue gas thermostat (all versions excepted FF): This device, for which the sensor is located in the left-hand section of the draught diverter, interrupts gas input to the main burner when the chimney is blocked or if there is no draught. In this case, the boiler shuts down and displays the error code E03.

- Safety thermostat: This device, for which the sensor is fitted to the heating flow, interrupts the gas supply to the burner in the event of the water overheating in the primary circuit. In this case, the boiler shuts down and displays the error code E02. - Ignition and flame detection electrode: fitted close to the burner, the ignition / ionisation electrode guarantees safety if there is no gas to the burner or ignition is incomplete. If no flame is detected, the boiler switches to safety shutdown after 3 re-ignition attempts and displays the error code E01.

- Low water pressure switch (or hydraulic pressure switch): This device is used to ignite the burner only if the pressure inside the installation is higher than 0.5 bar. Otherwise, the boiler shuts down and shows the error code E10.

- Measurement of the gradient of the boiler temperature, measured by the boiler sensor:

The burner stops if the boiler temperature gradient exceeds 5°C per second. In this case, the boiler shuts down and displays the error code E25. Cut-off because of the gradient is activated 12 seconds after the flame is detected by the electrode if the boiler temperature exceeds 42°C. The anomaly is temporary but, if the error is duplicated more than 3 times, the boiler shuts down and the error code E25 is displayed steadily on the readout. This may occur if there is air in the heating circuit or if there is no water circulation or insufficient circulation in the primary circuit.

- Measurement of the over-temperature in heating mode, measured by the boiler sensor: In heating mode, the burner stops when the boiler temperature exceeds the heating set point temperature by 20°C. In this case, the boiler shuts down and displays the error code E26. The anomaly is temporary but, if the error is duplicated more than 3 times, the boiler shuts down and the error code E26 is displayed steadily on the readout. This may occur if there is no water circulation or insufficient circulation in the primary circuit.

- Heating circuit safety valve: This device is calibrated to 3 bar and controlled by the heating circuit. - Safety valve on the DHW circuit: This device is calibrated to 7 bar

Scenario with MS 24 MI VMC boilers (for France only):

The MS 24 MI VMC boiler is fitted with a special device used to make the connection to a unit that mechanically extracts combustion products.

Operating principle:

- A thermostat is placed in the draught diverter.

- When the burner is ignited and the fan is running normally, the thermostat is swept by the ambient air.

- If the ventilation becomes faulty (either because of a fan breakdown, an obstruction in the duct or extraction outlet, or for any other reason), the flow rate of ambient air diminishes and the temperature at which the combusted air and gas are mixed increases immediately; The draught diverter thermostat cuts off the electrical circuit, causing the gas inlet to be locked down. This brings about a boiler safety lockout and the error code E03 is displayed.

The appliance is shut down and cannot start up again until after a manual intervention.

After checking the ventilation circuit (duct, fan, etc.), it will be possible to reset the boiler. Collective safety device (DSC):

This boiler can, where present, be connected to the gas VMC collective safety device (this device is in no event a substitute for the device integrated in the boiler).

The mains supply to the boiler (230 V 50 Hz) is done by a specific line, controlled by a safety relay, independent of the boiler and located in the room to be heated. The safety relay itself is managed by the control device (pressure switch, tachometer, etc.) for the collective VMC.

If the latter breaks down, the mains supply to the boiler will be interrupted, temporarily shutting off the gas supply to the burner. The appliance is in the OFF position and will start up again automatically after the fault has been cleared.

(30)

30

(31)

31

3

(32)

32

3 1. Product launch date . . . 33

2. Modifications - Technical information . . . 34

(33)

33

3 1. Product launch date

Appliance Date Details

MS 24 MS 24 MI MS 24 FF MS 24 MI FF

From: February 2011 Commercialization in FRANCE_{Commercialization in other countries}

MS 24 MI VMC From: February 2011 Commercialization in FRANCE

MS 24 BIC

MS 24 BIC FF From: May 2011

Commercialization in FRANCE Commercialization in other countries

(34)

34

3 2. Modifications - Technical information

2.1 IT2581 - New disconnector

2.1.1 Description of the modification

Following the change in supplier, the WATTS disconnector will be replaced by a CALEFFI disconnector and a new

connecting tubing, on the whole MS boiler range.

Forecasted application date in production: February 2012.

2.1.2 Spare parts

A new set with pipe + disconnector + gaskets is available and already delivered in spare parts , to replace

the old disconnector:

Previous version - WATTS New version - CALEFFI

Appliance type References in spare parts

Exploded view Marker Reference Description

MS 24 BIC MS 24 BIC FF MS 24 MI VMC MS 24 MI MS 24 MI FF

New version (CALEFFI disconnector)

236 JJD710877800 CALEFFI disconnector + Pipes + Gaskets

234 JJD710795501 Disconnector pipe - CALEFFI

Previous version (WATTS disconnector) 234 JJD710395200 Disconnector pipe - WATTS

622 JJD710395300 Disconnector pipe - WATTS

MS 24 MS 24 FF

New version (CALEFFI disconnector)

236 JJD710876000 CALEFFI disconnector + Pipe + Gaskets

Previous version (WATTS disconnector) 234 JJD005659050 Disconnector pipe - WATTS 236

(35)

35

(36)

36

(37)

37

4

TROUBLESHOOTING

DIAGRAMS

(38)

38

4 1. Checks to make before carrying out any work . . . 39

2. Error codes . . . 40

3. Diagrams . . . 42

(39)

39

4 1. Checks to make before carrying out any work

Before carrying out any work on the boiler because of a breakdown, the following points must be checked:

Check the hydraulic connections

Check the hydraulic pressure in the circuit

Check that the air has been correctly purged from the installation Check the inflation pressure of the expansion vessel

Check that the installation is clean

Check the mains supply voltage (Respect live / neutral )

Check that there is no parasitic current on the earthing (Neutral / Earth)

Check that the combustion gases are adequately evacuated and that the diameter of the diaphragm is correct, if necessary.

Z

See section 5, chapter 4

Check the gas pressure (Gas supply pressure - Nozzle pressure)

(40)

40

4 2. Error codes

If a malfunction occurs, the control panel displays an error code. To reset the boiler: Press the R key for at least 2 seconds.

If the fault is not cleared: Correct the malfunction of the appliance. Refer to the appropriate synoptic (see below)

The boiler stops automatically after the fifth attempt to reset it. To carry

out another attempt to reset it, switch the boiler off for a few seconds.

Error code Type of malfunction Causes / Corrections

E01

Gas supply or ignition error. Check the gas supply. Check the condition and connection of the

ignition and ionisation electrode cable. Refer to the appropriate synoptic.

E02 Safety thermostat tripped. Overheating _alarm. Check the safety thermostat. _{Refer to the appropriate synoptic.}

E03

Flue gas thermostat tripped (all versions excepted FF) /Air pressure switch (FF Versions).

The burner is off.

• FF Versions (Air pressure switch): flue gas extraction terminal blocked, venturi blocked, fan blocked, venturi-pressure switch connection interrupted. Correct it.

• MS 24 - 24 MI - 24 MI VMC Versions (Flue gas thermostat) : - Chimney blocked: Clean.

- No draught: make sure there is some draught.

E04

Malfunction after the flame going out unexpectedly 6 times (loss of flame signal).

Press the R key for at least 2 seconds. Refer to the appropriate synoptic.

E05

Breakdown of the CTN heating sensor. Check the CTN heating sensor. If the sensor is damaged:

- If running, the boiler shuts down - The fan stops after 10 seconds

- The pump continues to run for 3 minutes. This error is cleared automatically when the sensor is replaced.

E06

Breakdown of the CTN domestic hot water

sensor. Check the CTN domestic hot water sensorNote: If the CTN sensor on the DHW circuit breaks down, hot water

production continues nevertheless. The temperature will be controlled by the heating sensor. The heating function continues to operate. This error is cleared automatically when the sensor is replaced.

E10

The water pressure is too low. The hydraulic pressure switch enables burner ignition only if the

pressure in the installation is higher than 0.5 bar. Check the water pressure.

E12 The hydraulic pressure switch

micro-switch always remains open.

Refer to the appropriate synoptic.

E13 The hydraulic pressure switch micro-_{switch always remains closed.} Refer to the appropriate synoptic.

(41)

41

4

E25

Maximum boiler temperature exceeded.

Anomaly because of too high gradient. The burner stops if the boiler temperature gradient exceeds 5°C per second. The display shows the error code E25. Cut-off because of

the gradient is activated 12 seconds after the flame is detected by the electrode if the boiler temperature exceeds 42°C. The anomaly is temporary but, if the error is duplicated more than 3 times, the boiler shuts down and the error code E25 is displayed steadily. This may occur if there is air in the heating circuit or if there is no water circulation or insufficient circulation in the primary circuit.

- Check that the plug in the automatic air vent located on top of the heating pump body is open.

- Check that there is sufficient flow rate in the installation.

E26

Maximum boiler temperature exceeded.

Anomaly for overheating. In heating mode, the burner stops when the boiler temperature exceeds the heating set point temperature by 20°C . In this case,

the display shows the error code E26. The anomaly is temporary but, if the error is duplicated more than 3 times, the boiler shuts down and the error code E26 is displayed steadily. This may occur if there is no water circulation or insufficient circulation in the primary circuit.

E31 Communication error between the boiler _{and the remote control.} Refer to the appropriate synoptic.

E32 Scaling alarm. Presence of limescale in

the exchanger.

Descale the appliance (See section 6, chapter 4.3 / 4.4). Press the

R key for at least 2 seconds.

E35 Flame presence anomaly (Parasite flame) Refer to the appropriate synoptic.

E36 Parasite flame or flame anomaly Refer to the appropriate synoptic.

E96 Power cut due to fall in voltage (voltage _{less than 170 Volts)} Automatic reset.

E97 Mains supply frequency anomaly (Hz) Automatic reset.

E98 - E99 Internal error on the PCB Replace the PCB.

(42)

42

4 3. Diagrams

Symbols used:

Before repair work:

- Check the good state of the fuses

- Ensure that all connectors are engaged, that there are no loose wires, by pulling them gently,

nor any trapped or damaged wires.

Before and after each intervention :

- Check and ensure that the sensor and 230 V cables are separated.

Fault display

XXX FAULT

END

Check to be made (yes/no)

Processing to be carried out or comment

(43)

43

4 3.1 No DHW production

(1) A08 = l/min x 10 No DHW production. END

Replace defective parts. no

yes

• Check if the boiler is in Heating Only or OFF/Frost

Protection position: Select the appropriate operating mode:

Summer ( ) or Winter ( ).

• MS 24 (FF) + DHW tank BMR.../ SR...: Check that

parameter F03 is correctly set to 03. See section 5, chapter 7.5.

• Establish a DHW flow rate of > 2 l per min.

Check whether

parameter A08(1) shows

the corresponding value. _{Check the reversal valve and}

its wiring. no

yes

Replace the PCB.

Check the flowmeter and its wiring See section 6, chapter 5.3.

no OK ? yes

Rectify the settings

Check the condition of the cold water valve, the filters, the flowmeter, the plate exchanger and the reversal valve.

OK ?

(44)

44

4 3.2 E01: Gas supply or ignition error

3.3 E02: Safety thermostat tripped

3.4 E03: Flue gas evacuation defect

E01 fault

Gas supply or ignition error.

END

See section A - page 49 no

OK ? yes

To reset the boiler:

Press the R key for at least 2 seconds.

E02 fault

Safety thermostat tripped.

END

Check the safety thermostat and its wiring. See section 6, chapter 5.4. no

OK ? yes

- Overheating due to a lack of flow rate: All the radiators are closed. - Vent the air in the heating system. Check that the plug in the automatic

air vent located on top of the heating pump body is open. - To reset the boiler: Press the R key for at least 2 seconds.

E03 fault

Flue gas thermostat (all versions except FF) or air pressure switch (version FF) tripped.

The burner is off.

END

All versions: See section E - page 51. FF Versions : See section C page 50. no

OK ? yes

(45)

45

4 3.5 E04: loss of flame signal

3.6 E05 or E06: Sensor fault

E04 fault

Malfunction after the flame going out unexpectedly 6 times.

END

See section C - page 50. no

OK ? yes

Press the R key for at least 2 seconds..

E05 / E06 fault

- Breakdown of the CTN heating sensor.

- Breakdown of the CTN domestic hot water sensor.

END

Replace the defective sensor. no

OK ? yes

Measure the resistance of the sensor on the connector terminals.

See section 6, chapter 5.2.

Check the harness

Replace the harness.

OK ? no

yes

(46)

46

4 3.7 E10, E12, E13: Hydraulic pressure switch defect

(Low water pressure switch)

no OK ? yes

- If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1 and 1.5 bar)

- Check that the plug in the automatic air vent located on top of the heating pump body is open;

- Carry out maintenance on the boiler (Clean the filters, Exchanger...).

E10 fault:

The water pressure is too low

E12 fault:

Pressure switch contact remains open

E13 fault:

Pressure switch contact remains closed.

Check continuity on the hydraulic pressure switch terminals (Normally open

contact): See section 6, chapter 5.6.

END

no Check the wiring.

OK ? Replace the harness.

yes

no

yes

Replace the PCB.

Replace the hydraulic pressure switch.

(47)

47

4 3.8 E25, E26: Maximum boiler temperature exceeded

E25, E26 fault

E25: Anomaly because of too high gradient. Water

circulation fault.

E26: Maximum boiler temperature exceeded.

END

Replacing the pump. no

yes Unblock the heating pump. Check that the heating

pump is operating correctly: See section 6, chapter 5.9.

The pump operates ?

Check the power supply to the pump (230 V) at the outlet on the PCB

(Terminals 6 - 7).

Replace the PCB. no

yes

Replace the pump wiring. Check pump operation (Power it

separately). no OK ? yes See section B page: 49. - Check parameters F08 and F09: Recommended value = 100

- Vent the heating installation.Check that the plug in the automatic air vent located on top of the heating pump body is open.

(48)

48

4 3.9 E31: Communication fault

3.10 E35 or E36: Parasite flame fault

E31 fault

Communication error between the boiler and the remote control. END See section A page: 49. no OK ? yes

Check the room thermostat if fitted.

If the room thermostat is not in use: check that the bridge is fitted to the connection terminal block.

E35 / E36 fault

Parasite flame or flame anomaly.

END

See section D - page 50. no

OK ? yes

Check the settings on the gas valve See section 6, chapter 6.

(49)

49

4 3.11 Sections

A - Defects E1, E31 or no display.

B

Check live-neutral compliance = 230 V and neutral-earth = 0 V.

Check the fuses on the control panel. Replace if necessary.

Check the room thermostat if fitted. If the room thermostat is not in use: check

that the bridge is fitted to the connection

terminal block. no

END yes

Replace the PCB. - Reset by pressing the R key for

at least 2 seconds.

- Press . Choose position

or (Press for 2 seconds to change function).

Check that the gas supply is available and that the gas pipe is sufficiently vented.

Display OK ?

Check that there is no voltage between

neutral and earth (< 5 V). < 5 V? yes See section D - page 50.

no

Appliance or cable defective in the electrical installation: - Replace or repair the electrical problem with the

installation

- Fit a circuit separation transformer.

Check the cleanliness of the heat exchanger. Carry out maintenance on the boiler. Clean

the filters. See section 6, chapter 4;

no

END yes

Replace the PCB. - Reset by pressing the R key for at

least 2 seconds.

- Press . Choose position or

(Press for 2 seconds to

change function). Display _OK?

Check continuity on the hydraulic pressure switch terminals.

See section 6, chapter 5.5 ok ?

yes

Replace the hydraulic pressure switch.

(50)

50

4 C

D

- Check the fan wiring.

- Check the power supply to the fan at the oultet on the PCB (230 V AC)

See section 6, chapter 5.11.

no

yes _{Replace the fan.}

Fan blocks or does not rotate correctly?

Check the settings on the gas valve.

END - Check the venturi pipe

- Check the air pressure switch connections.

OK ? no Refurbish / Replace.

yes

Check the ionization/ignition electrode: - Position

- Visual inspection (state of wear) - Wiring

- Check that the voltage on the electrode terminal block on the PCB is 230 V.

no

yes _{Replace the ignition electrode /}

ionisation sensor. OK ?

Replace the PCB.

(51)

51

4 E

The flue gas thermostat has tripped or is defective. Check continuity on the flue gas thermostat (all versions except FF) or the air pressure switch (versions FF) terminals.

no

yes

Replace the flue gas thermostat (all versions except FF) or the air pressure

switch (versions FF). continuity?

Check the resistance on the flue gas thermostat or air pressure

switch terminals.

END

Resistance > 1.5 Ohm.

Replace the harness.

yes

no _{Replace the board /}

(52)

52

(53)

53

5

INSTALLATION

COMMISSIONING

(54)

54

5 1. Location of the appliance . . . 55

1.1 Location . . . 55

1.2 Ventilation . . . 55

2. Hydraulic connections . . . 56

2.1 Water treatment in the heating circuit . . . 56

2.2 Installing the boiler in new installations (installations less than 6 months old) . . . 57

2.3 Installing the boiler in existing installations . . . 57

2.4 Hydraulic connections (Heating circuit, DHW circuit) . . . 58

2.5 Connecting the expansion vessel . . . 58

2.6 Connecting a solar DHW tank . . . 59

2.7 Expansion vessel DHW circuit (Option) - MS 24 BIC (FF) . . . 60

3. Gas connection . . . 61

3.1 Connecting . . . 61

3.2 Gas categories . . . 61

4. Connecting the flue gas pipe . . . 62

4.1 Installation . . . 62

4.2 Concentric air / flue gas connection (FF Versions) . . . 63

5. Electrical connections . . . 66

6. Filling the installation with water . . . 67

7. Check points before commissioning . . . 68

7.1 Checking the gas supply pressure . . . 68

7.2 Check the hydraulic circuit . . . 69

7.3 Bleed . . . 69

7.4 Check the electrical connections . . . 69

7.5 Parameter settings - MS 24 (FF) - MS 24 MI (FF / VMC) . . . 70

7.6 Parameter settings - MS 24 BIC (FF) . . . 72

8. Commissioning . . . 73

8.1 Commissioning procedure . . . 73

8.2 The boiler does not start up . . . 73

8.3 In the event of run-off noise . . . 73

(55)

55

5 1. Location of the appliance

1.1 Location

The boiler must be installed in a frost-free environment. Do not place the appliance above a heat source or a cooking appliance. The IPX5D protection rating allows the boiler to be installed in a kitchen or bathroom .

The warranty does not apply to damage to the boiler caused by these instances.

1.2 Ventilation

To ensure adequate accessibility to the appliance and facilitate maintenance, leave enough space around the boiler. The minimum recommended dimensions are shown in the illustration in mm.

If the heating appliance is installed in residential premises where people are present all the time, ensure sufficient ventilation pursuant to prevailing regulations.

MS 24, MS 24 MI, MS 24 MI VMC, MS 24 BIC

Do not block (even partially) the ventilation vents in the room in which the appliance is installed.

Fresh air inlet:

France: In the event of direct air inlet, the cross-section of the fresh air inlet, which

is compulsory, must have a minimum surface area of 50 cm2 (NF P 45.204).

Other countries: the cross section of the aeration inlet, which is compulsory in

the premises in which the boiler is installed, must comply with the standards in force in the country.

Evacuation of polluted air:

When the boiler is installed in a kitchen, for example, the evacuation of polluted air from appliances not connected to a discharge flue (e.g. gas cooker) can be

handled by the boiler's draught cut-off. To do this, it is sufficient for the top of the boiler casing to be positioned at least 1.8 mm from the floor.

If located in a closed cubby hole, ensure ventilation of the cubby hole itself with a minimum total cross section of 600 cm2. The

minimum distance between the front of the boiler and the door or closing panel must be 10 cm.

S1 + S2 = 600 cm2

MS 24 ... FF

If combustion gas evacuation and combustive air intake are done using a concentric pipe (connection type C12 or C32), ventilation of the room in which the appliance is installed is not necessary unless the gas supply comprises one or more mechanical connections (see NF P 45.204).

In order to avoid damage to the boiler, it is necessary to prevent the contamination of combustion air by chlorine and/or fluoride compounds, which are particularly corrosive. These compounds are present, for example, in aerosol sprays, paints, solvents, cleaning products, washing products, detergents, glues, snow clearing salts, etc.

Therefore:

- Do not pull in air evacuated from premises using such products: hairdressing salons, dry cleaners,

industrial premises (solvents), premises containing refrigeration systems (risk of refrigerant leakage), etc.

- Do not stock such products close to the boilers.

If the boiler and/or peripheral equipment are corroded by such chloride or fluoride compounds, the contractual guarantee cannot be applied.

100 mini 25 min. 25 min. 730 min. 250 min. 200 S1 S2

(56)

56

5 2. Hydraulic connections

If an extra pump is used on the heating system, it must be fitted to the boiler's return circuit in order that the hydraulic pressure switch can operate correctly.

The installation must comply in all matters to the standards and rules which govern the work and interventions in individual and collective homes, and other constructions. The boiler must be used only in closed circuit heating installations.

2.1 Water treatment in the heating circuit

Central heating systems must be cleaned to eliminate debris (copper, strands, brazing flux) linked to the installation of the system and deposits that can cause malfunctions (noise in the system, chemical reaction between metals). On the other hand, it is important to protect central heating systems against corrosion, scaling and microbiological growth by using a corrosion inhibitor adapted to all types of systems (steel, cast iron radiators, heated floor, PER).

For Switzerland : The water quality must comply with the SICC directives No. 97-1F "Treatment of water intended for heating, steam, refrigeration and air conditioning installations".

Specifications required for the heating water:

The characteristics of the heating water are essential to guarantee good performance, operating safety and the longevity of the equipment used. Poor water quality in the heating circuits may damage the installation by leaving limescale deposits or causing corrosion.

To implement a condensing boiler with an aluminium-silicium heating body, we recommend the limiting values of the principal

characteristics of the heating water with reference to the requirements of prevailing regulations(1):

- pH 6.5 to 8.5,

- Conductivity < 500 µS/cm at 25°C. - Chloride content < 20 mg/l, - Suspended particles < 20 mg/l.

The requirements on water hardness are directly related to the total volume of the installation. The limiting value takes the installed output as its frame of reference. In the case of a cascade installation, the reference will be the limiting value of the water used for initial filling corresponding to the smallest boiler.

(1) For Germany: VDI 2035

Recommendations:

- If the aforementioned conditions are not met or to provide additional protection to the unit (network, radiators, etc.), it will be necessary to resort to water treatment in the installation (product, filtration and tracking of parameters), which will factor in the variety of materials present, including the aluminium heating body.

- Take any precautions necessary to prevent the introduction into and formation of oxygen in the water in the installation by checking that the expansion vessel, the safety valve(s), etc. are correctly sized

- Antifreeze products: ensure that these are compatible with aluminium and, if need be, with other components in the installation.

- Limit topping up the installation with water to the minimum. If using treatment, check the properties of the water and the concentrations of active substances in the installation at least 2 times a year.

- De Dietrich Thermique recommends the following manufacturers: Cillit - Climalife - Permo - Sentinel.

Water hardness

Useful output Pn (kW) _°dH Concentration _°f

≤ 70 2.8 - 20 5 - 20

(57)

57

5 2.2 Installing the boiler in new installations (installations less than 6

months old)

- Clean the installation with a universal cleaner to eliminate debris from the appliance (copper, hemp, flux). - Thoroughly flush the installation until the water runs clear and shows no impurities.

- Protect the installation against corrosion and frost with an inhibitor and an anti-freeze.

2.3 Installing the boiler in existing installations

If renovating an old network, we recommend checking the compliance of the characteristics of the existing water and, where applicable, removing any sludge and rinsing before installing the new boiler.

- Remove sludge from the installation.

- Clean the installation with a universal cleaner to eliminate debris from the appliance (copper, hemp, flux). - Thoroughly flush the installation until the water runs clear and shows no impurities.

- Protect the installation against corrosion and frost with an inhibitor and an anti-freeze.

- Fitting a filter or an appropriate decanting pot to the installation's return circuit should prevent the deposit of suspended particles in the generator body

(58)

58

5 2.4 Hydraulic connections (Heating circuit, DHW circuit)

The water connections to the boiler must be made with a maximum torque of 30 Nm.

2.5 Connecting the expansion vessel

MS... : The boiler is fitted as standard with an 6-litre expansion vessel. MS... BIC : The boiler is fitted as standard with an 7.5-litre expansion vessel

` Initial pressure of the expansion vessel: 1 bar.

` Average water temperature: 85 °C

Flow temperature: 95 °C Return temperature: 75 °C

MS 24 (FF) MS 24 MI (FF) MS 24 BIC (FF)

)

Ref./

Marking MS 24 (FF) MarkingRef./ MS 24 MI (FF, VMC), MS 24 BIC (FF)

Heating flow - G 3/4

(Ø 18 mm internal)

Heating flow - (Ø 18 mm internal)G 3/4

_{Primary flow to DHW tank (if present)}- G 3/4

Domestic hot water outlet _{(Ø 16 mm internal)} - G 1/2

_{Gas inlet - G 3/4 (Ø 18 mm internal)}

Gas inlet - G 3/4

(Ø 18 mm internal)

_{Primary return, DHW tank (if present) - G 3/4}

Domestic cold water inlet - G 1/2

(Ø 16 mm internal)

Heating return - G 3/4

(Ø 18 mm internal)

Heating return - G 3/4(Ø 18 mm internal)

Domestic cold water inlet - G 1/2

(Filling valve)

MS 24 (FF) MS 24 MI (FF, VMC)

Nominal pressure of the

expansion vessel (bar) 0.5 0.6 0.7 0.8 0.9 1

Maximum volume of the

installation (litres) 110 105 95 86 78 70

MS 24 BIC (FF)

Nominal pressure of the

expansion vessel (bar) 0.5 0.6 0.7 0.8 0.9 1

Maximum volume of the

installation (litres) 135 130 120 105 95 85 2 3 5 4 7 1 G000378 _G000379 2 4 5 3 4 2 1 G000380

(59)

59

5 2.6 Connecting a solar DHW tank

Hyrdaulic connection kit for a solar circuit with directional thermostatic valve (Optional delivery for

MS 24 MI... only)

Thanks to this kit (which includes a directional thermostatic valve), water coming from the solar tank passes through the boiler only when the water temperature is lower than a preset value (48°C, for example). The boiler will handle any additional heating of the water to the required temperature.

Option

HX23

Hydraulic boiler connection plate _{Hot water inlet from the boiler}

_{Hot water inlet from the solar DHW tank} _{Cold water inlet from the boiler} _{Domestic hot water outlet - G1/2} _{Domestic hot water inlet - G1/2} Cold water inlet sectional valve Directional thermostatic valve

65 1 65 65 65 65 208 2 3 4 5 6 8 7 G000451

(60)

60

5 2.7 Expansion vessel DHW circuit (Option) - MS 24 BIC (FF)

We recommend mounting the DHW expansion vessel in the following cases:

- If a pressure reducer has been fitted (if the domestic cold water mains pressure is higher than 4 bar). - If a non-return valve is fitted to the cold water supply.

- If the cold water supply circuit is insufficient to enable the expansion of the hot water contained in the boiler's storage tank and it is necessary to provide for the use of a DHW expansion vessel.

Important: To ensure that the expansion vessel operates correctly, the pressure on the cold water inlet must be less than 4 bar.

If this is not the case, fit a pressure reducer. The pressure reducer must be set so as to provide a water supply pressure of less than 4 bar.

The expansion vessel on the DHW circuit is connected to points A and B as shown in the diagram above.

1. Remove the plug

2. Put the end piece and the hose in place

After Sales Service Guide