After Sales Service Guide

Transcription

1 After Sales Service Guide ZENA MS wall-hung gas boilers A 28/09/2012

2 Use of this guide is reserved for qualified professionals 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 Symbols used 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 Reference Reference to other paragraphs in the guide 2

3 1. PRESENTATION - SPECIFICATIONS Contents: page 6 2. OPERATING PRINCIPLE Contents: page PRODUCT EVOLUTION Contents: page TROUBLESHOOTING DIAGRAMS Contents: page INSTALLATION - COMMISSIONING Contents: page CONTROLS AND SETTINGS Contents: page ELECTRICAL DIAGRAMS Contents: page

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5 PRESENTATION SPECIFICATIONS 1 5

6 CONTENTS 1. Presentation The various models Performance (in accordance with RT 2005 for France) Strong points Control panel options Boiler options Specifications Technical specifications Characteristics of domestic hot water production Location of the data plate Characteristics of the heating pumps

7 1. Presentation 1.1 The various models Boiler Type of connection Model Useful output range (kw) Chimney MS Heating only Flue gas outlet* MS 24 FF Chimney CMV (1) MS 24 MI MS 24 MI VMC (1) Heating and micro-storage domestic hot water production Flue gas outlet* MS 24 MI FF Chimney MS 24 BIC Heating + DHW Boiler with integrated DHW tank (40 litres) Flue gas outlet* MS 24 BIC FF * Horizontal forced flue: Diameter 60/100 mm or Vertical forced flue: Diameter 80/125 mm + adapter (1) for France only 7

8 Boiler Type of connection Model Useful output range (kw) Chimney MS 24 / BS80 (MS 24 + BMR 80) Heating + DHW BS80 calorifier The DHW calorifier can be placed to the left or right of the boiler. Flue gas outlet* MS 24 FF/ BS80 (MS 24 FF+ BMR 80) Chimney MS 24 / BS 130 (MS 24 + SR 130) Heating + DHW BS130 calorifier DHW tank placed under the boiler. Flue gas outlet* MS 24 FF / BS 130 (MS 24 FF+ SR 130) * Horizontal forced flue: Diameter 60/100 mm or Vertical forced flue: Diameter 80/125 mm + adapter 8

9 1.2 Performance (in accordance with RT 2005 for France) Generator type: Energy used: Natural gas (All models) or Propane (except MS 24 MI VMC) - MS 24 (FF): Heating only Combustion evacuation: Chimney, Flue gas outlet or - MS 24 MI (FF, VMC): Heating and domestic hot water. Boiler with CMV. < 10 litres of additional storage integrated in the secondary circuit. Min. return temperature: 20 C - MS 24 BIC (FF) : Heating and domestic hot water (Boiler with Min flow temperature: 30 C integrated DHW tank > 10 litres) EC certificate reference: Boiler type: Low temperature atmospheric gas boiler MS... : 51BT3644/45DR/ED03 Burner: Atmospheric with no fan (Chimney versions); Atmospheric with fan (FF MS... FF : 51BT3642/43DR/ED03 Versions). MS... VMC : 51CL4020/21DR/ED 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. 1 * Version VMC: for France only. 9

10 1.4 Control panel options AD137 / AD200 / AD247 / AD248 AD Q029 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. AD Q003det MCX_Q0009 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. 1 MS_Q0005 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. 10

11 1.5 Boiler options BMR80 SR 130 MCR_QG0010 MS_Q0029 MS_Q QG043A MS_Q0030 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 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 microstorage 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. MS_Q0004 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 For the other hydraulic connection options, refer to the current product catalogue. 1 Stove fittings accessories, specific to MS boilers DY908 G DY736 G 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 DY909 DY910 G G Bi-flow boiler connection kit - Package HX30 DY911 3 CE pipe connection kit Diameter 60/100 mm - Package DY911 G

12 2. Specifications 2.1 Technical specifications 1 Boilers Generator type (1) for France only - (2) For VMC versions: No operation on propane. MS 24 24/BS FF 24 FF/BS... MS 24 (FF): Heating only MS 24 (FF)/BS:Heating and DHW with separate domestic hot water tank 24 MI 24 MI VMC (1) 24 MI FF 24 BIC 24 BIC FF 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 LHV efficiency % at 100% Pn - 70 C % at 30% Pn - 40 C Nominal water flow rate at Pn, T = 20 K m 3 /h Stand-by losses to T = 30 K W Minimum useful output (heating and DHW modes) kw Manometric height available for the heating circuit mbar Water content l Gas flow rate at Pn - Natural gas H or L m 3 /h 2.78/ / / / / / Propane Kg/h (2) Required depressurisation at the nozzle mbar Mass flue gas flow rate at Pn Kg/h Electrical specifications Power supply voltage V AC Auxiliary electrical power (Ex circulating pump) at Pn W Electrical power circulating pump at Pn / Pmin W 75 / / / / / / 75 Electrical protection index IPX5D IPX5D IPX5D IPX5D IPX5D IPX5D Other characteristics Weight (empty) kg 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. Boilers (1) for France only MS 24 MI 24 MI FF 24 MI VMC(1) 24 BIC 24 BIC FF 24 / BS80 24 FF / BS80 24 / BS FF / BS130 Tank capacity (Domestic hot water) l Power exchanged kw Flow in 10 min. at T =30 K l/10 mm Flow per hour at T =35 K l/h Specific flow at T=30 K (in accordance with EN ) l/min Auxiliary electrical power (In DHW mode) W Losses through the outer casing at T = 45 K W Cooling constant Cr Wh/24h L K

13 2.3 Location of the data plate MS 24 BIC (FF) MS 24 (FF) - MS 24 MI... (FF) The data plate provides important information on the boiler: serial number, model, gas category, etc 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 (2-speed pump) MS 24 MI - MS 24 MI FF - MS 24 MI VMC 1 H: Manometric height available with the pump, at T=20 K. Q: Water flow l/h MS 24 - MS 24 FF - MS 24 BIC - MS 24 BIC FF 13

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15 OPERATING PRINCIPLE 2 G

16 CONTENTS 1. Description Control panel Main parts Operating principle diagram Boiler MS Boiler MS 24 MI - MS 24 MI VMC Boiler MS 24 FF Boiler MS 24 MI FF Boiler MS 24 BIC Boiler MS 24 BIC FF Description of the boiler operating

17 1. Description 1.1 Control panel Info mode Alternating display: É 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. 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 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. 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). / : Setting the domestic hot water temperature If the sensor is not connected, a full stop is displayed. 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 Operating in DHW mode mode. Flame present A04 Heating temperature setting ( C) Igniter fault ERROR Reinitialisation A05 If an outside temperature sensor is connected, display of the heating gradient (Kt:See section 6, chapter 6.2). 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: A07 Not used. - Measured temperature - Set temperature A08 Domestic hot water flow (l/min x 10) - For versions MI and BIC only - Operating modes - Failure code A09 Last error which occured. 2 17

18 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 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 2 20 Filling valve 21 Pressure gauge 22 Heating circuit safety valve Model shown: MS 24 FF 18

19 MS 24 MI 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 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 18 2-speed heating pump with automatic air vent 19 Heating / DHW inversion valve 20 Disconnector 21 Filling valve (Blue) 22 Pressure gauge 23 Heating circuit safety valve 24 Domestic hot water outlet temperature sensor 2 19

20 MS 24 MI MS 24 MI VMC 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 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 microstorage DHW 15 2-speed heating pump with automatic air vent 16 Heating / DHW inversion valve 17 Disconnector 18 Filling valve (Blue) 19 Pressure gauge 20 Heating circuit safety valve 21 Domestic hot water outlet temperature sensor 2 Model shown: MS 24 MI 20

21 MS 24 BIC FF MS 24 BIC 2 Model shown: MS 24 BIC FF 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 C safety thermostat 24 Heating circuit safety valve 12 Ignition/ionization electrode 25 Low water pressure switch 13 Combustion chamber 21

22 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 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 2 20 Disconnector Heating flow Primary flow to DHW tank Gas inlet Domestic cold water inlet (Filling valve) Heating return 22

23 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 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 2 Heating flow Domestic hot water outlet Gas inlet Domestic cold water inlet (Filling valve) Heating return 23

24 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 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 2 23 Heating circuit safety valve 24 Disconnector Heating flow Primary flow to DHW tank Gas inlet Domestic cold water inlet (Filling valve) Heating return 24

25 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 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 2 Heating flow Domestic hot water outlet Gas inlet Domestic cold water inlet (Filling valve) Heating return 25

26 2.5 Boiler MS 24 BIC 2 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) 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) 18 Expansion vessel 7.5 litres (Heating circuit) Heating return 26

27 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 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 20 Heating flow temperature sensor 2 27

28 2.7 Description of the boiler operating 2 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 A: Ignition flow the heating set point. B: Flame detection - full load DHW function (230 ma on G20/G25 or 310 ma on C: Switching to DHW or heating mode 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 OFF key is used to select one of the following operating modes: 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), postcirculation 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. 28

29 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. 2 29

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31 PRODUCT EVOLUTION 3 31

32 Contents 1. Product launch date Modifications - Technical information

33 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 3 33

34 2. Modifications - Technical information 2.1 IT New disconnector 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. Previous version - WATTS New version - CALEFFI Forecasted application date in production: February Spare parts A new set with pipe + disconnector + gaskets is available and already delivered in spare parts, to replace the old disconnector: 3 Appliance type MS 24 BIC MS 24 BIC FF MS 24 MI VMC MS 24 MI MS 24 MI FF MS 24 MS 24 FF References in spare parts Exploded view Marker Reference Description New version (CALEFFI disconnector) 236 JJD CALEFFI disconnector + Pipes + Gaskets 234 JJD Disconnector pipe - CALEFFI 622 JJD Disconnector pipe - CALEFFI Previous version (WATTS disconnector) 234 JJD Disconnector pipe - WATTS 622 JJD Disconnector pipe - WATTS New version (CALEFFI disconnector) JJD CALEFFI disconnector + Pipe + Gaskets JJD Disconnector pipe - CALEFFI Previous version (WATTS disconnector) 234 JJD Disconnector pipe - WATTS 34

35 35 3

36 3 36

37 TROUBLESHOOTING DIAGRAMS 4 37

38 Contents 1. Checks to make before carrying out any work Error codes Diagrams

39 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. See section 5, chapter 4 Check the gas pressure (Gas supply pressure - Nozzle pressure) See section 6, chapter

40 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. Fault that can be reset 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. Check the safety thermostat. Refer to the appropriate synoptic. FF Versions (Air pressure switch): flue gas extraction terminal blocked, venturi blocked, fan blocked, venturi-pressure switch connection interrupted. Correct it. MS MI - 24 MI VMC Versions (Flue gas thermostat) : - Chimney blocked: Clean. - No draught: make sure there is some draught. Press the R key for at least 2 seconds. Refer to the appropriate synoptic. E02 Safety thermostat tripped. Overheating alarm. Flue gas thermostat tripped (all versions excepted FF) /Air pressure switch (FF Versions). The burner is off. E03 E04 Malfunction after the flame going out unexpectedly 6 times (loss of flame signal). Breakdown of the CTN heating sensor. E05 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. Check the CTN domestic hot water sensor Note: 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. The hydraulic pressure switch enables burner ignition only if the pressure in the installation is higher than 0.5 bar. Check the water pressure. Refer to the appropriate synoptic. 4 E06 E10 Breakdown of the CTN domestic hot water sensor. The water pressure is too low. E12 The hydraulic pressure switch microswitch always remains open. The hydraulic pressure switch microswitch always remains closed. E13 Refer to the appropriate synoptic. 40

41 Error code Type of malfunction Causes / Corrections E25 E26 E31 E32 Maximum boiler temperature exceeded. Anomaly because of too high gradient. Maximum boiler temperature exceeded. Anomaly for overheating. Communication error between the boiler and the remote control. Scaling alarm. Presence of limescale in the exchanger. 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. 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. Refer to the appropriate synoptic. 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. Power cut due to fall in voltage (voltage Automatic reset. E96 less than 170 Volts) E97 Mains supply frequency anomaly (Hz) Automatic reset. E98 - E99 Internal error on the PCB Replace the PCB. 4 41

42 3. Diagrams 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. Symbols used: XXX FAULT Fault display Check to be made (yes/no) Processing to be carried out or comment END End of processing 4 42

43 3.1 No DHW production No DHW production. 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. yes OK? no Rectify the settings Check the condition of the cold water valve, the filters, the flowmeter, the plate exchanger and the reversal valve. Clean / replace the defective part(s). Check whether parameter A08 (1) shows the corresponding value. yes Check the reversal valve and its wiring. no Check the flowmeter and its wiring See section 6, chapter 5.3. OK? no Replace defective parts. yes Replace the PCB. 4 END (1) A08 = l/min x 10 43

44 3.2 E01: Gas supply or ignition error E01 fault Gas supply or ignition error. To reset the boiler: Press the R key for at least 2 seconds. yes OK? END no See section A - page E02: Safety thermostat tripped E02 fault Safety thermostat tripped. - 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. yes OK? END no Check the safety thermostat and its wiring. See section 6, chapter E03: Flue gas evacuation defect E03 fault Flue gas thermostat (all versions except FF) or air pressure switch (version FF) tripped. The burner is off. To reset the boiler: Press the R key for at least 2 seconds. yes OK? END no All versions: See section E - page 51. FF Versions : See section C page

45 3.5 E04: loss of flame signal E04 fault Malfunction after the flame going out unexpectedly 6 times. To reset the boiler: Press the R key for at least 2 seconds.. yes OK? END no See section C - page E05 or E06: Sensor fault E05 / E06 fault - Breakdown of the CTN heating sensor. - Breakdown of the CTN domestic hot water sensor. Measure the resistance of the sensor on the connector terminals. See section 6, chapter 5.2. yes OK? Check the harness no Replace the defective sensor. 4 yes OK? no Replace the harness. Replace the PCB. END 45

46 3.7 E10, E12, E13: Hydraulic pressure switch defect (Low water pressure switch) E10 fault: The water pressure is too low E12 fault: Pressure switch contact remains open E13 fault: Pressure switch contact remains closed. - 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...). yes OK? no Check the wiring. OK? no Replace the harness. yes Check continuity on the hydraulic pressure switch terminals (Normally open contact): See section 6, chapter 5.6. Contact open? no Replace the hydraulic pressure switch. yes 4 Replace the PCB. END 46

47 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. - Check parameters F08 and F09: Recommended value = Vent the heating installation.check that the plug in the automatic air vent located on top of the heating pump body is open. Unblock the heating pump. Check that the heating pump is operating correctly: See section 6, chapter 5.9. The pump operates? no yes See section B page: 49. Check the power supply to the pump (230 V) at the outlet on the PCB (Terminals 6-7). yes no Replace the PCB. Check pump operation (Power it separately). no OK? yes Replace the pump wiring. Replacing the pump. 4 END 47

48 3.9 E31: Communication fault E31 fault Communication error between the boiler and the remote control. 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. yes OK? END no See section A page: E35 or E36: Parasite flame fault E35 / E36 fault Parasite flame or flame anomaly. Check the settings on the gas valve See section 6, chapter 6. 4 yes OK? END no See section D - page

49 3.11 Sections A - Defects E1, E31 or no display. Check that the gas supply is available and that the gas pipe is sufficiently vented. Check live-neutral compliance = 230 V and neutral-earth = 0 V. Check the fuses on the control panel. Replace if necessary. - Reset by pressing the R key for at least 2 seconds. - Press. Choose position or (Press for 2 seconds to change function). Display OK? yes END 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 Replace the PCB. 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. B Check the cleanliness of the heat exchanger. Carry out maintenance on the boiler. Clean the filters. See section 6, chapter 4; - Reset by pressing the R key for at least 2 seconds. - Press. Choose position or (Press for 2 seconds to change function). Display OK? yes END 4 Check continuity on the hydraulic pressure switch terminals. See section 6, chapter 5.5 no ok? yes no Replace the PCB. Replace the hydraulic pressure switch. 49

50 C - Check the fan wiring. - Check the power supply to the fan at the oultet on the PCB (230 V AC) See section 6, chapter Fan blocks or does not rotate correctly? yes Replace the fan. no Check the settings on the gas valve. yes - Check the venturi pipe - Check the air pressure switch connections. OK? no Refurbish / Replace. END D 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. OK? yes Replace the ignition electrode / ionisation sensor. no Replace the PCB. 4 END 50

51 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. continuity? no Replace the harness. yes Check the resistance on the flue gas thermostat or air pressure switch terminals. Resistance > 1.5 Ohm. no Replace the board / electronics circuit. yes Replace the flue gas thermostat (all versions except FF) or the air pressure switch (versions FF). END 4 51

52 4 52

53 INSTALLATION COMMISSIONING 5 G

54 Contents 1. Location of the appliance Location Ventilation Hydraulic connections Water treatment in the heating circuit Installing the boiler in new installations (installations less than 6 months old) Installing the boiler in existing installations Hydraulic connections (Heating circuit, DHW circuit) Connecting the expansion vessel Connecting a solar DHW tank Expansion vessel DHW circuit (Option) - MS 24 BIC (FF) Gas connection Connecting Gas categories Connecting the flue gas pipe Installation Concentric air / flue gas connection (FF Versions) Electrical connections Filling the installation with water Check points before commissioning Checking the gas supply pressure Check the hydraulic circuit Bleed Check the electrical connections Parameter settings - MS 24 (FF) - MS 24 MI (FF / VMC) Parameter settings - MS 24 BIC (FF) Commissioning Commissioning procedure The boiler does not start up In the event of run-off noise

55 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. 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. 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. S1 25 min. 25 min. min. 200 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 cm 2 (NF P ). 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 cm 2. The minimum distance between the front of the boiler and the door or closing panel must be 10 cm. S1 + S2 = 600 cm 2 MS 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 ). S2 100 mini 730 min

56 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. 5 Water hardness Useful output Pn (kw) Concentration dh f (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. 56

57 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 The boiler must be used only in closed circuit heating installations. 5 57

58 2.4 Hydraulic connections (Heating circuit, DHW circuit) MS 24 (FF) MS 24 MI (FF) MS 24 BIC (FF) ) G G G The water connections to the boiler must be made with a maximum torque of 30 Nm. Ref./ Marking MS 24 (FF) Heating flow - G 3/4 (Ø 18 mm internal) Primary flow to DHW tank (if present) - G 3/4 Gas inlet - G 3/4 (Ø 18 mm internal) Primary return, DHW tank (if present) - G 3/4 Heating return - G 3/4 (Ø 18 mm internal) Domestic cold water inlet - G 1/2 (Filling valve) Ref./ Marking MS 24 MI (FF, VMC), MS 24 BIC (FF) Heating flow - G 3/4 (Ø 18 mm internal) Domestic hot water outlet - G 1/2 (Ø 16 mm internal) Gas inlet - G 3/4 (Ø 18 mm internal) Domestic cold water inlet - G 1/2 (Ø 16 mm internal) Heating return - G 3/4 (Ø 18 mm internal) 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 5 MS 24 (FF) MS 24 MI (FF, VMC) Nominal pressure of the expansion vessel (bar) Maximum volume of the installation (litres) MS 24 BIC (FF) Nominal pressure of the expansion vessel (bar) Maximum volume of the installation (litres)

59 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 HX G 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 59

60 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. 1 2 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 5 60

61 3. Gas connection 3.1 Connecting Caution Check that the boiler is properly set for the type of gas used. For further details, see the appliance's rating plate. See also below: Heading 6, Chapter 6 - Gas settings - Adapting to another gas type. Close the main gas valve before starting work on the gas pipes. Before mounting, check that the gas meter has sufficient capacity. To do this, you should keep in mind the consumption of all domestic appliances. If the gas meter has a too low capacity, inform the energy supply company. Ensure that there is no dust in the gas pipe. We recommend installing a gas filter on the gas pipe to prevent clogging of the gas valve unit. Connect the gas pipe in accordance with prevailing standards and regulations. 3.2 Gas categories For France The boilers are factory-set to operate on natural gas (H (G20) or L (G25)) For Italy The boilers leave the factory operating with H natural gas (G20) For Spain The boilers leave the factory operating with H natural gas (G20) Boiler type Gas category Gas type Connection pressure (mbar) MS 24 (FF) MS 24 MI (FF) MS 24 BIC (FF) For Poland The boilers leave the factory operating with E natural gas (G20) II 2E+3P Natural gas L (G25) 25 Natural gas H (G20) 20 Propane (G31) 37 MS 24 MI VMC I 2E+ Natural gas H (G20) 20 Natural gas L (G25) 25 Boiler type Gas category Gas type Connection pressure (mbar) MS 24 (FF) MS 24 MI (FF) MS 24 BIC (FF) II 2H3P Propane (G31) 37 Natural gas H (G20) 20 Boiler type Gas category Gas type Connection pressure (mbar) MS 24 (FF) MS 24 MI (FF) MS 24 BIC (FF) II 2H3P Propane (G31) 37 Natural gas H (G20) 20 Boiler type Gas category Gas type Connection pressure (mbar) Natural gas E (G20) MS 24 (FF) 20 Natural gas Lw (G27) MS 24 MI (FF) II 2ELWLs3P MS 24 BIC FF Natural gas Ls (G2.350) 13 Propane (G31) 37 Natural gas E (G20) 20 MS 24 BIC II 23P Propane (G31) 37 For other countries: see the nameplate or the instructions supplied with the appliance. 5 61

62 4. Connecting the flue gas pipe 4.1 Installation - The boiler must be connected in compliance with prevailing provisions and standards, i.e. with conduits intended to evacuate pressurized flue gases. - The pipes must allow no leakage of flue gases and be resistant to corrosion. They must be installed in such a way that their relative position in relation to the special evacuation system cannot be modified even after service interventions. - The appliance, including its connection conduit, must remain accessible with a view to maintenance and repair. Caution For France: Boilers can only be installed with flue gas connection pipes provided by the constructor. For other countries: the boiler must be connected with an approved flue gas system. The clear section must comply with the standard. The chimney must be swept before the installation of the evacuation conduit. MS 24, MS 24 MI, MS 24 BIC (Chimney versions) The cross section of the chimney duct must be at least equal to that of the boiler's flue gas nozzle (Diameter 125 mm). The connection to the chimney must be as short and as direct as possible. MS 24 MI VMC (Model available only in France): Connection to the mechanically controlled ventilation system (MCV-gas flue) MS 24 MI VMC wall-hung boilers are designed to be connected as follows: Connection to a mechanical ventilation system in tandem with the stale air discharge, or Connection to a mechanical extraction system for the boiler combustion products only. These connection systems apply equally in collective buildings and individual homes and must satisfy prevailing standards both in terms of commissioning and of maintenance. In accordance with the NF D standard, MS 24 MI VMC boilers are fitted with an internal device that cuts off the gas supply when the draught from mechanical extraction becomes insufficient. However, if the flue serves one or more levels other than the one on which the MS 24 MI VMC boiler is connected, the installation of a Collective Safety Device (DSC) is compulsory. MS 24 FF, MS 24 MI FF, MS 24 BIC FF - Air/flue gas connection MS FF wall-hung gas boilers are sealed appliances to be connected according to one of the following configurations: Configuration C 12x Configuration C 32x Configuration C 52 Configuration C 42x Lmax Lmax L2 max 2 m L3 LA LF Lmax 5 G L1 Lmax = L1+L2+L3 Lmax = L A + L F G LA max = 10 m Maximum length = lengths of the straight air/flue gas ducts + equivalent lengths of other components. For the installation of the air/flue gas connection ducts, details of the various configurations and the installation rules, see the "Flue Systems" document. G G

63 4.2 Concentric air / flue gas connection (FF Versions) Maximum length for the air/flue connection pipes Table of the maximal acceptable lengths of the air/flue connection pipes Type of air/flue gas connection Diameter Maximum length Lmax (m) C Concentric pipes connected to a horizontal 60/100 mm 4 12x Alu terminal 80/125 mm 10 C Concentric pipes connected to a vertical 32x Alu 80/125 mm 9 terminal C Bi-flow adapter and separate single air/flue gas 60/100 mm 52 Alu 30 ducts (combustive air taken from outside) 2 x 80 mm C 42x Collective conduit for sealed boiler (3CE) Alu 60/100 mm 4 On concentric flue gas discharge systems (forced flue), the C0 2 level in the annular space in the measurement piping can also be checked. The flue gas discharge system is considered leak-proof if the measured CO 2 level is lower than 0.2% (When the boiler operates at maximum output). Equivalent conduit lengths (metres) - flue gas system delivered by De Dietrich Thermique Connection diameter (in mm) Ø 60/100 Ø 80/125 Ø 60 - rigid Ø80 - rigid (Alu) Ø80 - Flexible Elbow Elbow Elbow Elbow Right inspection tube inspection elbow Inspection T Inspection tube for flexible pipe Condensate collector 60/100 mm (DY910) Condensates adapter/recuperator Ø 60/100 on Ø 80/125 (DY909)

64 4.2.2 Diaphragm on flue gas duct for concentric connection The concentric duct is used to evacuate combusted gases to the outside and to supply the boiler with combustive air. The 90 coaxial elbow can turn around 360 and can be used to connect the boiler to the intake/discharge duct in any direction. It can also be used as an extra elbow in combination with a coaxial duct or a 45 elbow. The first 90 elbow is not taken into account in calculating the maximum length available. The end of the duct comes out outside the building and must clear the brickwork to allow for installation of the aluminium cover plate and its seal and prevent any water infiltration. The minimum gradient of these ducts towards the outside must be 1 cm per metre of length. Using the flue gas duct diaphragm and dimensions: Boiler type MS 24 FF MS 24 MI FF MS 24 FF BIC Concentric evacuation/intake connection diameter (mm) Length (m) Using a diaphragm on the intake diameter (mm) 60 / to to 4 NO 80 / to / to to 5 NO 80 / to to 10 NO A: Diaphragm B: Fixing clamp B A 5 64

65 4.2.3 Separate evacuation/intake connections (FF Versions) This type of installation makes it possible to separate the intake and evacuation flows into separate ducts coming out outside the building. The combustive air intake and the flue gas evacuation terminal can be located in different places. The separation kit includes an evacuation duct adapter (100/80) and an intake duct adapter. To install the intake duct adapter, use the screws and the gasket previously removed from the obturator. Setting the air flow rate in a separate duct It is necessary to set the air flow rate to optimise the operating and combustion parameters. The air intake connection can be turned to set the air inlet according to the total length of the intake and evacuation ducts. Turn it to increase or reduce the air quantity as needed. For a more accurate setting, use a combustion products analyser to measure the CO 2 content at the maximum heat produced by the boiler. Set the air intake in such a way as to obtain a CO 2 value that matches the indications in the table below. LF Intake Diaphragme diaphragm d aspiration LA G Lmax = L A + L F LA max = 10 m Position of the diaphragm Boiler type L A + L F (m) Air intake setting position (mm) CO 2 (in %) G20 G25 G31 MS 24 FF MS 24 MI FF 0 to to to MS 24 BIC FF 0 to to

66 5. Electrical connections - Any interventions inside the boiler must be done by a qualified and authorised person - Before any interventions, ensure that the electrical power is disconnected. - Only qualified professionnals may carry out electrical connections, always with the power off. - The electrical connections shall comply with standards in force The earthing must comply with the NFC (France) or the RGPT (Belgium) standards. - The equipment must have a power supply equipped with a omnipolar switch with an opening distance above 3 mm. Protect the connection to the mains with a 6 amp fuse. - Under no circumstances must sensor cables (very low voltage) be placed in cable ducts or channels carrying cables supplying 230 V. Furthermore, a minimum distance of 10 cm should be kept between cables supplying very low voltage and cables supplying 230 V. If replacing the power cable, use a regulation HAR HO5 VV-F cable of 3x0,75 mm2 with a maximum diameter of 8 mm. Keep to the polarity shown on the terminals: phase (L), neutral (N) and earth. Access to the connection terminal: Cut the power supply to the boiler Unscrew the 1 / 2 holding screws in the control panel. Tilt the control panel. Open the cover (1 screw) to access the terminal block for the electrical connections. MS 24 (FF), MS 24 MI (FF), MS 24 VMC Screw Fuses 5 MS 24 BIC (FF) G Fuses Electrical connection: 230 V, 50 Hz. (L) : Live (Brown) (N): Neutral (Sky blue) (): Earth (Yellow - Green) (Terminals 1-2): Connecting the room temperature thermostat Fuses: 2 A Fuses The quick type 2 A fuses are incorporated in the power supply terminal block. Pull out the black fuse holder to check them and/or replace them. Checks Check the polarities shown on the terminals: live (L), neutral (N) and earth () Check that the difference in potential between earth () and neutral (N) is 0. Otherwise, review the earthing. Check the electrical connections to the thermostat and the other external controls. 66

67 Filling the installation with water The first start-up is to be performed by your installation/commissioning engineer. The boiler is fitted with a hydraulic safety device that prevents its operation without water. Switch off the mains supply Before filling, open the valves on every radiator in the installation. Water treatment in the heating circuit: See section 5, chapter T B MS 24 MI (FF) - MS 24 MI VMC MS 24 (FF) A Drain cock B Pressure gauge C Filling valve MS 24 (FF): D Disconnector MS 24 BIC (FF) G A Drain cock B Tank drainage valve C Filling valve D Pressure gauge 1. Open the cold water inlet and heating outlet valves. We recommend opening the valves very slowly to facilitate air venting. 2. Open the disconnector valves (During filling, air can escape from the system via the automatic air vent). 3. Close the disconnector valves when the manometer indicates a pressure of 2 bar. 4. Checking the water-side connections for tightness. Regularly check that the water pressure in the installation is between 0.7 and 1.5 bar. After filling and priming all circuits with water: Completely disgas the boiler and the installation for optimum operation. 5 67

68 7. Check points before commissioning The first start-up is to be performed by your installation/commissioning engineer. Water treatment in the heating circuit: As most heating systems are designed from various materials, it is recommended to provide a water treatment to prevent or reduce the problems (metal corrosion, formation of scale and sludge, microbiological contamination, chemical changes in the untreated system water). See section 5, chapter Checking the gas supply pressure. Check that the gas type supplied matches the data shown on the boiler's data plate. Caution: Do not put the boiler into operation if the supplied gas is not in accordance with the approved gas types. To ascertain the gas types permitted, see chapter: Gas categories - Heading 5 - Chapter 3.2. If the pressure exceeds the authorised pressure range: - Natural gas G20 = mbar, - Natural gas G25 = mbar; - Propane G31 = mbar) Suspend commissioning. Inform the gas supply company. MS 24 MI... MS 24 BIC... 5 Caution: Ensure that the boiler is switched off. 1. Open the main gas supply. 2. Unscrew the two screws located under the front panel by a quarter turn and remove the panel. 3. Tilt the control panel (screwed down) to access the gas valve. 4. Check the gas supply pressure at the pressure outlet P a on the gas valve unit - Connect the manometer. 5. Check the tightness of the gas connections made after the gas valve unit in the boiler. 6. Check the tightness of the gas line, including the gas valves. 7. Purge the gas supply pipe within the boiler by unscrewing the pressure outlet on the gas block. Tighten the measurement point when the pipe has been sufficiently purged. 68

69 7.2 Check the hydraulic circuit Check that the installlation and the boiler are adequately primed with water (See section 5, chapter 6). Check that there are no leaks on the hydraulic connections Check the water pressure in the heating system. The hydraulic pressure must reach a minimum of 0.8 bar. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1.5 and 2 bar). Checking the hydraulic pressure: On the mechanical pressure gauge, located under the boiler. 7.3 Bleed It is essential to vent any air found in the boiler's internal circuit and in the system's circuit: Open the gas inlet valve, Turn the boiler on, Check that the plug in the automatic air vent located on top of the heating pump body is open, Activate the operating mode Winter ( ) using the key; Activate a heat requirement by setting the heating and DHW set point temperatures or by setting the room thermostat; Alternate the heat requirement for the heating with the domestic hot water requirement by opening a hot water tap. If, after a few attempts at ignition, the boiler goes into safety lockout, the display shows the error code E01. To reset the boiler: Press the key for at least 2 seconds. Repeat the procedure at least two more times. After venting the boiler circuit, proceed with initial commissioning. 7.4 Check the electrical connections See section 5, chapter 5, page

70 7.5 Parameter settings - MS 24 (FF) - MS 24 MI (FF / VMC) To access the boiler parameters: Press the - ( ) and - ( ) keys simultaneously for at least 6 seconds. The display shows the code "F01", alternating with the value of the parameter. To modify the value of a parameter: Press the +/- ( ) keys to scroll through the parameters, Use the + and - ( ) keys to change the parameter value. Press the key to confirm the setting: The display shows MEM. Press the key to cancel a modification and retain the previous value : The display shows ESC. Parameter settings - MS 24 (FF) - MS 24 MI (FF / VMC) F01 F02 F03 Parameter descriptions Boiler type 10 = Leak proof box 20 = Atmospheric gas burner Gas type 01 = Propane 02 = Natural gas (with corresponding diaphragm) Hydraulic system 00 = Production of instantaneous domestic hot water 03 = Boiler with an independent DHW tank 04 = Boiler for heating only 13* = Production of instantaneous domestic hot water and plate exchanger heating for 24 h (See table below) 14* = Production of instantaneous domestic hot water and plate exchanger heating for 1 h Factory setting 24 MI FF 24 FF 24 MI 24 MI VMC (2) (3) (3) É 24 5 * See table below F04-F05 Parameter settings programmable relay 1 and 2 00 = No associated function 00 F06 Setting the maximum set point temperature ( C) 00 = 85 C - 01 = 45 C (Do not modify) 00 Inlet configuarion for domestic hot water priority : F07 00= Flow switch - Turbine flux Meter BITRON 01= Flow switch - Turbine flux Meter FUGAS = Not used F08 Maximum boiler output during heating (0-100%) 100 F09 Maximum boiler output in DHW (0-100%) 100 F10 Minimum heating output (0-100%) 00 F11 Waiting time before another ignition 00 to 10 minutes (00=10 seconds,...) 03 F12 Troubleshooting: Last error which occured. see : Description of error codes. -- F13-F14-F15 Factory data - Do not modify 00 Antilegionella function (with F03=03) F16 00 = Antilegionella function not activated (1) = Antilegionella function activated (Set temperature C) Selection heating pressure switch type F17 00 = hydraulic pressure switch = Differential hydraulic pressure switch F18 Factory data 00 (1)To activate the antilegionella function, programme the F16 parameter to a value of between 55 and 67 C. When the function is enabled, the boiler's electronics system heats the water in the tank to a temperature greater than the value of F16 once a week. The function is tripped only if the water has never exceeded the value of F16 in the previous 7 days. (2) MS 24 MI VMC (for France only) : No operation on propane. (3) Caution - MS 24 (FF) versions with independent tank: The F03 parameter must be set to

71 MS 24 MI... Versions: Parameter F03 Description F03 = 13 Preheating: 24 h Adjustment F03 = 14 Preheating: 1 h Factory setting Factory setting = DHW function : 3-star Preheating 40 minutes after the last heating operation or 40 minutes after the last DHW demand 20 minutes after the last DHW demand Heating temperature setting Heating temperature setting = DHW setpoint temperature + 13 K Duration Permanent 1 hour Display The symbol appears and flashes 5 71

72 7.6 Parameter settings - MS 24 BIC (FF) To access the boiler parameters: Press the - ( ) and - ( ) keys simultaneously for at least 6 seconds. The display shows the code "F01", alternating with the value of the parameter. To modify the value of a parameter: Press the +/- ( ) keys to scroll through the parameters, Use the + and - ( ) keys to change the parameter value. Press the key to confirm the setting: The display shows MEM. Press the key to cancel a modification and retain the previous value : The display shows ESC. F01 F02 Parameter descriptions Boiler type 10 = Leak proof box 20 = Atmospheric gas burner Gas type 02 = Natural gas and Propane (with corresponding diaphragm) MS 24 BIC FF Factory setting MS 24 BIC F03 Hydraulic system (Do not modify) 15 F04 Parameter setting programmable relay 1 (Do not modify) 04 F05 Parameter setting programmable relay 2 (DHW load pump) 03 F06 Setting the maximum set point temperature ( C) 00 = 85 C - 01 = 45 C (Do not modify) 00 F07 Inlet configuarion for domestic hot water priority : 00= Flow switch - Turbine flux Meter BITRON 01= Flow switch - Turbine flux Meter FUGAS 02= Not used F08 Maximum boiler output during heating (0-100%) 100 F09 Maximum boiler output in DHW (0-100%) 100 F10 Minimum heating output (0-100%) 00 F11 Waiting time before another ignition (00-10 minutes) - 00 = 10 seconds 03 F12 Troubleshooting: Last error which occured. see : Description of error codes. -- F13 Factory data - Do not modify 00 F14 Factory data - Do not modify 00 É F15 Factory data - Do not modify 00 F16 F17 Antilegionella function (With F03=03) 00 = Antilegionella function not activated (1) = Antilegionella function activated (Set temperature C) Selection heating pressure switch type: 00 = hydraulic pressure switch, 01 = Differential hydraulic pressure switch F18 Factory data (1) To activate the antilegionella function, programme the F16 parameter to a value of between 55 and 67 C. When the function is enabled, the boiler's electronics system heats the water in the tank to a temperature greater than the value of F16 once a week. The function is tripped only if the water has never exceeded the value of F16 in the previous 7 days. 72

73 8. Commissioning 8.1 Commissioning procedure The first start-up is to be performed by your installation/commissioning engineer. Before proceeding with commissioning, check the installation and its tightness: See section 5, chapter 7 Turn the boiler on. The display briefly shows the verion of the regulator program and then OFF (OFF position). Open the main gas supply Open the gas valve on the boiler Press the key to choose one of the 4 positions: Summer ( ), Winter ( ), Heating only ( ) or Stop. - Stop (Display: OFF) / Antifreeze protection active - DHW heating only: Only domestic hot water production is ensured, the heating is switched off. (Display: Heating flow temperature + ) - Heating only (Display: Heating flow temperature + ) - Heating and domestic hot water (Display: Heating flow temperature + + ) É The boiler starts up: The main burner ignites and the symbol is displayed on the screen. In Summer position ( ), the main burner is ignited only if there is a DHW demand. Set the set point temperatures for the heating and the domestic hot water with the + / - ( ) and + / - ( ) keys. Heating: factory setting 85 C. When setting the heating temperature, the symbol flashes and the display shows the set point temperature for the heating( C). DHW: factory setting 85 C. Recommended setting: 50 C. When setting the DHW temperature, the symbol flashes and the display shows the domestic hot water set point temperature ( C). 8.2 The boiler does not start up On initial commissioning, as long as any air in the gas pipes has not been eliminated, the burner may fail to ignite immediately and bring about the safety lockout of the system (E01 fault). If this happens, repeat the ignition procedure until the gas supply stabilises. Reset by pressing the key for at least 2 seconds. No information is shown on the display. - Check the mains supply voltage - Check the fuses - Check the connection of the power cord If there is a problem, the error is displayed on the screen. See section In the event of run-off noise Vent the air in the heating system If noises caused by flow in the system can be heard: First of all, vent the heating system. See section 5, chapter

74 5 74

75 CONTROLS AND SETTINGS 3,8 k 6 75

76 Contents 1. Information to be noted before contacting Technical Assistance Accessing the boiler components Draining the boiler Maintenance - Boiler maintenaince to be scheduled Burner, combustion chamber and ignition electrode Cleaning the fan ( FF Versions) Cleaning the water filters and descaling Checking the expansion vessel Checking the anode in the tank (MS 24 BIC...) Checking the safety valve Checking the tightness of the flue gas evacuation and air inlet connections (FF Versions) Checking the hydraulic pressure Checking combustion Checking the domestic hot water tank (When the boiler is connected to a DHW tank) Checking the components Switching off Testing the sensors Checking the flowmeter (For versions MI and BIC only) Checking the safety thermostat (105 C) Checking the ignition / ionization sensor electrode Checking the low water pressure switch Checking the gas valve Checking the reversal valve speed heating pump with automatic air vent DHW load pump (MS 24 BIC...) Checking the fan Checking the downdraught thermostat Air pressure switch control (FF versions only) Replacing the main exchanger Gas settings - Gas conversion procedure Propane conversion kit Gas conversion procedure

77 1. Information to be noted before contacting Technical Assistance Information on the appliance (to be found on the nameplate): Boiler model Gas type Serial number Other information to be noted: Information displayed when the boiler is switched on Display Description 3.2 (For all models) The figure displayed corresponds to the version of the software (Brief display) 6 77

78 2. Accessing the boiler components 1. Remove the 2 the front panel holding screws. 2. Remove the front panel. MS 24 MS : 3. Unscrew the screw holding the panel closed (Right-hand side) 4. Tilt the control panel to the left. MS 24 BIC: 5. Unscrew the 2 holding screws on the top of the panel. 6. Tilt the control panel forwards MS 24 BIC 6 Board access: 7. MS : (all versions excepted BIC): - Take out the 2 screws - Open the 6 plastic clips on the control panel. - Tilt the control panel cover to access the PCB. 8. MS 24 BIC: - Unscrew the 3 control panel cover holding screws, to access the PCB. MS

79 3. Draining the boiler H 2 O 1 2 Caution: The water may still be hot. Switch off the boiler. Cut the gas supply to the boiler. Close the main water valve, If it is not necessary to drain the entire installation, close the boiler's isolating valves. 3.1 Boilers MS 24 (FF) - MS 24 MI (FF) - MS 24 MI VMC Boiler with hydraulic connection plate: G To drain the boiler with the valve located on the connection plate (optional), proceed as follows: - Close the boiler's stop cocks; - Open the drain valve located on the heating flow valve (5 mm spanner). - Drain the boiler; - Close the drain valve (5 mm spanner). Boiler not fitted with hydraulic connection plate (All countries except France): MS 24 MI (FF) - MS 24 MI VMC MS 24 (FF) The boiler can be drained directly from the drain valve with pipe fitting, incorporated in the water unit: - On MS 24 MI, MS 24 MI VMC and MS 24 MI FF boilers, the valve with pipe fitting is located on the bottom, - On MS 24, MS 24 FF boilers, the drain valve can be found beside the pump. Proceed as follows: - Close the boiler's stop cocks (if fitted). - Open the drainage valve (using a male 8 mm hexagonal spanner) - Drain the boiler ; - Close the drain valve (using a male 8 mm hexagonal spanner). 6 79

80 3.2 Boilers MS 24 BIC (FF) Boiler with hydraulic connection plate: To drain the boiler with the valve located on the connection plate (optional), proceed as follows: - Close the boiler's stop cocks; - Open the drain valve located on the heating flow valve (5 mm spanner) - Drain the boiler; - Close the drain valve (5 mm spanner). Boiler not fitted with hydraulic connection plate (All countries except France): 6 The boiler can be drained from the drain valve with pipe fitting, located in the bottom of the boiler: - Close the boiler's stop cocks; - Open the drainage valve (using a male 8 mm hexagonal spanner) - Drain the boiler; - Close the drain valve (using a male 8 mm hexagonal spanner). 80

81 Draining the domestic hot water tank (MS 24 BIC): G G Close the main water inlet valve. 2. Drain the domestic hot water circuit by opening a hot water tap. The tank can be drained using the valve B at the water unit. 3. After draining the tank, close the valve on the connection plate. 6 81

82 4. Maintenance - Boiler maintenaince to be scheduled An annual inspection is compulsory. If, on annual inspection, the combusted gas analysis is not in compliance, a combustion setting must be carried out. Before any operation, ensure that: - The mains supply is disconnected, - The gas supply is shut off, - The boiler is hydraulically isolated and drained (See section 5, chapter 7). 4.1 Burner, combustion chamber and ignition electrode Screwdriver: Reference Be careful when re-assembling! (... FF Versions) 6 During inspection and maintenance operations, always replace all gaskets on the parts removed. 1. Remove the front plate from the combustion chamber. Remove the burner drawer. Check the state of the burner and its fastening. Clean the burner with a soft brush Clean the combustion chamber Remove any impurities found in the combustion chamber with a vacuum cleaner 2. Check that there are no cracks and/or other tears on the surface of the dismantled burner. If this is the case, replace the burner. 3. Replace the seals. 4. Check the condition of the electrode. Replace the ionization/ignition electrode in the following cases: - Electrode worn. - Electrode or porcelain damaged (chips, cracks...) or dirty. 5. Check the position of the ignition and flame detection electrode (See following chapter: page 98) 6. Reassembly: To reassemble correctly, take care to position the two tabs at the bottom of the front plate of the combustion chamber correctly in the notches provided in the combustion chamber. 82

83 4.2 Cleaning the fan ( FF Versions) MS 24 FF Disconnect the electrical connections from the fan Remove the venturi. Remove the holding screw from the fan support plate Clean the inside of the fan using a vacuum cleaner Fit the unit together. MS 24 BIC FF Disconnect the electrical connections from the fan Remove the venturi. Remove the 2 holding screws from the fan support plate Clean the inside of the fan using a vacuum cleaner Fit the unit together. 6 83

84 4.3 Cleaning the water filters and descaling Before any operation, ensure that: - The mains supply is disconnected, - The gas supply is shut off, - The boiler is hydraulically isolated and drained (See section 6, chapter 3). To drain the domestic hot water circuit: Close the main water inlet valve. BIC Versions: Drain the domestic hot water tank Drain the domestic hot water circuit by opening a hot water tap Cleaning the filters and cartridges (MI... Versions ) 6 The filters in the heating circuit and the domestic hot water circuit are housed in removable cartridges. Proceed carefully when dismantling the various parts of the water unit. Do not use pointed tools and do not exert excessive force to remove the holding clips. DHW Filter (detail E): Remove the clip (1) and extract the cartridge (2) containing the DHW filter on the cold water inlet, taking care not to exert excessive force. Eliminate any impurities and deposits found on the filters. Put the filters back in place in the cartridge.. Heating cartridge / Reversal valve: - Detail G: Dismantle the reversal valve motor (2) held in place by the clip (1) and the valve body (3). Then rinse the valve body in clean water. - Detail F: Remove the clip (1) and extract the cartridge and the filter (2). Eliminate any impurities by rinsing the filter. Refit the filter (detail F) and the reversal valve (detail G) Also clean the housing of the DHW sensor (detail D): to do this, remove the clip (1) and dismantle the sensor (2). Bypass cartridge (detail H): Remove the clip (1) and extract the cartridge (2). Eliminate any impurities and deposits found on the cartridge. Fit the unit together. When replacing and/or cleaning the O-rings in the hydraulic circuit, use only Molykote 111 and no other lubricant (Do not use petroleum or grease). 84

85 Cleaning the filters and cartridges (BIC... Versions ). Proceed carefully when dismantling the various parts of the water unit. Do not use pointed tools and do not exert excessive force to remove the holding clips. Heating cartridge: To extract the heating filter cartridge: - Detail G: Dismantle the reversal valve motor (2) held in place by the clip (1), - Detail F: Remove the clip (1) and extract the cartridge and the filter (2), taking care not to exert excessive force. Eliminate any impurities and deposits found on the filters. Fit the unit together. When replacing and/or cleaning the O-rings in the hydraulic circuit, use only Molykote 111 and no other lubricant (Do not use petroleum or grease). 6 85

86 Descaling / Cleaning the plate exchanger (MI and BIC versions) Depending on the water quality and the operating mode, limescale deposits may form in the drinking water circuit side of the plate exchanger. Periodic descaling may therefore be necessary. To clean the exchanger and/or the drinking water circuit, we recommend using Cillit FFW-AL or Benckiser HF-AL. Replace the 4 gaskets! G To dismantle the domestic hot water exchanger: Unscrew the connection pipe from the expansion vessel at the water unit, Remove the heating pressure switch (detail H), without disconnecting the wiring; Remove the two holding screws H from the water/water exchanger, which can be seen from the front, and extract the exchanger from its housing 2. Clean the plate exchanger and then put it back in place, after replacing the 4 gaskets 3. Tighten the expansion vessel connection pipe at the water unit 4. Put the hydraulic pressure switch back in place in its housing (Detail H). 6 Caution: Proceed carefully when dismantling the various parts of the water unit. Do not use pointed tools and do not exert excessive force to remove the holding clips. 86

87 4.4 Checking the expansion vessel Check the expansion vessel and replace it if necessary. See section 5, chapter 2.7 Connecting the expansion vessel. Version MS... BIC: Check also the DHW expansion vessel. If the transfer capacity is noticably low (temperature too low and/or flow rate less than 6.2 l/min), clean the plate exchanger (domestic hot water side) and the water filter cartridge. 4.5 Checking the anode in the tank (MS 24 BIC...) Check the magnesium anode every year and replace it if need be: Close the cold water inlet Drain the domestic hot water tank (See section 6, chapter 3.2) Dismantle the anode A by undoing the nut at its base using a flat, 27 mm spanner. If dismantling the hatch cover B, replace the gasket. 4.6 Checking the safety valve MS 24 (MI) (FF) MS 24 BIC (FF)) Heating: 3-bar safety valve 2 DHW (BIC Versions): 7-bar safety valve. Check whether there is any water in the end of the flow pipe on the safety valve. If any leaks are detected, replace the safety valve. 6 87

88 4.7 Checking the tightness of the flue gas evacuation and air inlet connections (FF Versions) The connection pipes must be serviced at least once a year. Check the tightness of the flue gases evacuation and air inlet connections. Check the concentric flue gas evacuation and combustive air inlet pipes. Check that the pipe and the terminal are empty along their entire length. On concentric flue gas discharge systems (forced flue), the C0 2 level in the annular space in the measurement piping can also be checked. The flue gas discharge system is considered leak-proof if the measured CO 2 level is lower than 0.2% (When the boiler operates at maximum output). 4.8 Checking the hydraulic pressure The hydraulic pressure must reach a minimum of 0.7 bar. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 0.7 and 1.5 bar). 4.9 Checking combustion MS FF Versions: The boiler is fitted with two specific outlets. One outlet is connected to the flue gas evacuation circuit and is used to check the combustion products characteristics and the combustion efficiency. The other outlet is connected to the combustive air intake circuit and is used to check whether any combustion products are put back into circulation in the coaxial ducts. In the outlet connected to the evacuation circuit, the following parameters can be checked Temperature of the combustion products Concentration of oxygen (O 2 ) Concentration of carbon dioxide (CO 2 ) Concentration of carbon monoxide (CO). The temperature of the combustive air must be taken by inserting a sensor to a depth of at least 3 cm inside the outlet. If the analysis of the flue gases does not comply, review the settings of the boiler and the installation (Connection to the flue gas pipe, Gas settings, Ventilation) MS 24 Versions (all versions excepted FF): Measure the concentration of carbon monoxide (CO) in the ambient air 50 cm from the front panel of the boiler for at least 30 seconds. The maximum CO content in the ambient air is 20 ppm. If a higher value is measured, review the settings of the boiler and the installation (Connection to the flue gas pipe, Gas settings, Ventilation). 6 88

89 4.10 Checking the domestic hot water tank (When the boiler is connected to a DHW tank) Components to be checked Magnesium anode The magnesium anode must be checked at least every 2 years. After the first check, determine the frequency of future checks on the basis of anode wear. The anode can be checked by one of the two methods below: Inspection: Open the domestic hot water tank: the anode must be replaced if its diameter is less than 15 mm (original diameter = 33 mm). Checking by electrical measurement: Remove the cover disconnect the earth wire from the anode measure the strength of the current between the tank and the anode. if the current is less than 0.1 µa, the anode must be replaced. DHW tank and exchanger In hard water regions, we recommend the annual descaling of the DHW tank in order to maintain its performance. The first check is usually done after 2 years at the same time as the visual check on the magnesium anode when the DHW tank is open. The periodicity of the following checks will be defined according to the scaling noted. Descaling the exchanger Descale the exchanger in order to maintain its performance levels. Descaling the DHW tank Remove limescale deposits in the form of sludge or strips in the bottom of the tank (If necessary, remove the DHW tank or use a water vaccum cleaner for floor-standing tanks located under the boiler). On the other hand, do not touch limescale adhering to the walls of the tank as it provides effective protection against corrosion and improves the insulation of the DHW tank. Safety valve or safety unit The safety valve or unit must be operated at least once a month to ensure proper operating and to prevent from any overpressure which may damage the DHW tank. Casing The tank casing can be cleaned with a soft cloth and soapy water. 6 89

90 Opening the SR 130 tank for maintenance The operations described below shall only be performed with the boiler and power supply off. Only original spare parts must be used. Maintenance operations must be done by a qualified engineer. Use a new leak tight seal on the inspection trap, Turn off the domestic cold water inlet, Open the hot water taps to drop the pressure and drain the pipes to the DHW tank. Removing the anode Remove the cover A using a broad-bladed screwdriver (see detail) and then remove the insulation, Remove the sensor B from its sensor tube, Remove the trap C (13 mm spanner). Check the condition of the anode and replace it if necessary. Check the extent of scaling in the tank and on the exchanger. Reassembly To re-assemble, perform the above actions in reverse order, Replace the leakproof seal E on the trap. Position the gasket with the retainer ring F, taking care to place the positioning lug on the gasket to the outside of the DHW tank and the retainer ring, Engage the B DHW sensor fully in the sensor tube. The flange mounting bolts must not be excessively tight: 8 N m ± 1. Use a dynamometric spanner. Note: An approximate torque of 8 N m is obtained by hand-tightening the nut and adding ¼ of a turn with a spanner. Filling and tightness check Open the cold water inlet, Fill the tank, Bleed the tank using the hot water taps, Close all hot water taps when the water flows normally and no more air is being flushed out, Restart the boiler, Heat the DHW tank to the operating temperature, Check the tightness of the flange on the DHW tank, Put the cover A back in place. 6 90

91 Opening the BMR 80 tank for maintenance The operations described below shall only be performed with the boiler and power supply off. Only original spare parts must be used. Maintenance operations must be done by a qualified engineer. Have a lip gasket and a retainer ring on hand for the inspection trap, Turn off the domestic cold water inlet, Open a hot water tap Open the valve on the safety unit Lift the insulation Pull out the DHW sensor (A) Remove the inspection trap (13 mm spanner) Drain the domestic hot water tank. Check the condition of the anode C. Replace if necessary. Check the extent of scaling in the tank and on the exchanger. Remove limescale deposits in the form of sludge or strips in the bottom of the tank. On the other hand, do not touch limescale adhering to the walls of the tank as it provides effective protection against corrosion and improves the insulation of the DHW calorifier. Replace the D lip gasket + E retainer ring. Place the positioning lug on the gasket toward the outside of the tank. C B Each time it is opened, the lip gasket + retainer ring unit must be replaced to guarantee tightness. Then replace all the parts in reverse order. The screws retaining the visit trap must be tightened to 6 N m +1/-0. Use a dynamometric spanner. Approximately 6 N m is obtained by manipulating the box spanner with the small lever and 15 N m by manipulating it with the large lever. Filling and tightness check Open the cold water inlet, Fill the tank, Bleed the tank using the hot water taps, Close all hot water taps when the water flows normally and no more air is being flushed out, Restart the boiler, Heat the DHW tank to the operating temperature, Check the tightness of the flange on the DHW tank. 6 91

92 5. Checking the components 5.1 Switching off Before any operation, ensure that: - The mains supply is disconnected, - The gas supply is shut off. Wait until the boiler cools down G Testing the sensors Ohmic values of the sensors The temperature/resistance correlation is shown below. - Boiler sensor (CTN) - Outside sensor (HX31) - Domestic hot water sensor (AD250)* - DHW sensor (CTN) G CTN sensor, 10 kohm at 25 C CTN sensor, 10 kohm at 25 C 6 0 C Ω -20 C Ω 35 C 6536 Ω 10 C Ω -15 C Ω 40 C 5332 Ω 20 C Ω -10 C Ω 45 C 4374 Ω 25 C Ω -5 C Ω 50 C 3607 Ω 30 C 8080 Ω 0 C Ω 55 C 2990 Ω 40 C 5372 Ω 5 C Ω 60 C 2491 Ω 50 C 3661 Ω 10 C Ω 65 C 2085 Ω 60 C 2535 Ω 15 C Ω 70 C 1753 Ω 70 C 1794 Ω 20 C Ω 75 C 1481 Ω 80 C 1290 Ω 25 C Ω 80 C 1256 Ω 90 C 941 Ω 30 C 8060 Ω 85 C 1070 Ω * Optional with independent DHW tank 92

93 5.2.2 Boiler sensor (CTN) MS 24 BIC (FF) MS 24 (FF) - MS 24 MI (FF / VMC) Disconnect the sensor wires, Measure the resistance on the sensor terminals. If the value measured by the ohmmeter does not match the one in the table, replace the sensor. Refer to the table of ohmic values of the sensors: page

94 5.2.3 Domestic hot water sensor CTN (MS 24 MI...) Disconnect the sensor to check its ohmic value. Measure the resistance on the sensor terminals. If the value measured by the ohmmeter does not match the one in the table, replace the sensor. Refer to the table of ohmic values of the sensors: page Tank sensor CTN (MS 24 BIC - MS 24 BIC FF) Disconnect the sensor to check its ohmic value If the value measured by the ohmmeter does not match the one in the table, replace the sensor. Refer to the table of ohmic values of the sensors: page

95 5.2.5 Outside sensor (Option package HX31) Measurement of the ohmic value: Disconnect the outside temperature sensor connected from the control panel (two RED cables). Measure the resistance on the sensor terminals: If the values measured on the ohmmeter do not correspond to those in the table, replace the sensor. Refer to the table of ohmic values of the sensors: page 92. Heating curve setting: The +/- keys are used to modify the heating curve kt. For a housing unit with average insulation fitted with a heating system using radiators, set the heating curve kt to a value of 25. Connecting outside sensor the TM = Boiler temperature TE = Outside temperature PCB MS 24 (FF) - MS 24 MI (FF/VMC) MS 24 BIC (FF) Connecting the outside sensor Connecting the outside sensor 6 95

96 5.3 Checking the flowmeter (For versions MI and BIC only) To check the flow switch : Open a hot water tap Press button for 5 seconds, Press the (+/-) keys next to to display the parameter A08: A08 = Domestic hot water flow (l/min x 10) If the measured flow rate does not match to the actual flow rate, the flowmeter is defective. The mains supply to the flowmeter can also be measured on the PCB: 5 VDC See electrical diagram in section

97 5.4 Checking the safety thermostat (105 C) MS 24 (FF) - MS 24 MI (FF/VMC) MS 24 BIC (FF) Allow the boiler to cool down. Disconnect the two terminal pins Connect the ohmmeter to the thermostat terminals The resistance should be equal to zero ohms (Normally closed contact) Otherwise, the safety thermostat is defective See electrical diagram in section

98 5.5 Checking the ignition / ionization sensor electrode The ignition electrode also acts as the ionization sensor. To check or replace the ignition electrode: Disconnect the ignition electrode cable, Remove the front plate from the combustion chamber (4 screws). MS 24 BIC (FF): Unscrew the connection under the burner drawer - 30 spanner, Remove the burner drawer (4 screws): Use the special screwdriver, reference Unscrew the screw holding the electrode in place, Check the good general appearance (particularly, no chips, cracks, dirt on the porcelain) and the state of wear of the electrode. Replace the electrode protection if necessary. Replace the ionization/ignition electrode in the following cases: - Electrode worn - Electrode or porcelain damaged (chips, cracks...) or dirty If replacement is necessary, proceed as follows: - Install the new electrode with a new protection. - Check the positioning of the electrode (gap: 3 mm) - To re-assemble, proceed in reverse order. Screwdriver: Reference MS 24 BIC (FF): All versions: 6 Position of the electrode: 98

99 5.6 Checking the low water pressure switch 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. Low water pressure switch: MS 24 MI... - MS 24 BIC Measure the ohmic value on the pressure switch terminals Contact open (infinite resistance): pressure less than or equal to / bar Contact closed (zero resistance): pressure more than 0.45 bar Water diaphragm pressure switch. Normally open contact (N.O.) Manufacturer: BITRON Model: SIO Maximum admissible current: 10A / 250 V AC Max operating pressure: 4 bar Max. admissible temperature: 90 C. See electrical diagram in section 7. Low water pressure switch: MS 24 - MS 24 FF Measure the ohmic value on the pressure switch terminals Contact open (infinite resistance): pressure less than or equal to / bar Contact closed (zero resistance): pressure more than 0.45 bar Normally open contact (N.O.) Maximum admissible current: 10A / 250 V AC 6 See electrical diagram in section 7. 99

100 5.7 Checking the gas valve Before any operation, ensure that: - The mains supply is disconnected, - The gas supply is shut off. Specifications: - Type: SIT SIGMA Electric coils connected in parallel - Electricity supply: 230 V - Maximum admissible pressure on the gas valve: 60 mbar - Mains supply to the modulator: ma DC Check the ohmic value of the valve Disconnect the connectors: Resistance on the electric modulator terminals: 20 Ohm (at 25 C) - Check the coil on the gas valve Terminals 1-3: 6,5 kohm Terminals 1-4: 7,4 kohm If the ohmmeter measurement is infinite, this shows a deterioration of the gas valve. M: Output modulator Checking the gas valve Connect the manometer Check the drop in pressure upstream when opening the gas valve. Replacing the gas valve Before any operation, ensure that: - The mains supply is disconnected, - The gas supply is shut off. 1. Close the main gas inlet valve 6 2. Close the gas valve of the boiler. 3. Cut the power supply to the boiler. 4. Disconnect the connectors 5. MS 24 BIC : Unscrew the fittings on the gas valve. MS 24 (MI)... : Dismantle the top and bottom flanges, each held in place by 2 screws (Allen key 4 mm). 6. Install the new gas valve with the new gaskets and connect the wiring harness. Caution: Put the diaphragm back in place - See section 6, chapter Check the leak tightness of the connections. 8. Check the settings according to the gas type: See section 6, chapter

101 5.8 Checking the reversal valve MS 24 MI... and MS 24 BIC : Valve motor axis in DHW position : Valve motor axis in heating position G To check switching of the reversal valve: - Pull the pin 1 securing the valve motor to the right, and then until it stops, - Pull the valve motor 2 to extract it from its housing - To create a DHW demand, open a hot water tap or increase the DHW set point temperature. - The axis 3 in the valve motor moves to the forward position (switch to DHW mode position) - Otherwise, the valve motor axis stays in heating position and does not switch Also check the wiring harness and the mains supply on the reversal valve

102 5.9 2-speed heating pump with automatic air vent High manometric height pump suitable for the majority of heating systems. The automatic air vent incorporated in the pump enables quick venting of the heating system. Automatic air vent Pump GRUNDFOS UPSO Disconnect the pump connector Check for the presence of the 230 V power supply on the connector terminals. See electrical diagram in section

103 5.10 DHW load pump (MS 24 BIC...) Pump GRUNDFOS UPSO CIL2 Disconnect the pump connector Check for the presence of the 230 V power supply on the connector terminals 5.11 Checking the fan Disconnect the electrical connections from the fan (Red wire - Blue wire). Measure the ohmic value on the fan terminals : the resistance should be between 38 and 48 Ohm (at 20 C) The presence of the 230 V power supply can be checked between the red and blue wires on the fan

104 5.12 Checking the downdraught thermostat Downdraught thermostat (Klixon type) (all versions excepted... FF ): MS 24 (MI): The flue gas thermostat shuts down the boiler if the flue gas temperature reaches 70 C. MS 24 MI VMC: The flue gas thermostat shuts down the boiler if the flue gas temperature reaches 57 C. The flue gas thermostat resets automatically. The code E03 appears. Disconnect the electrical wires. Measure the ohmic value on the flue gas thermostat terminals: - At room temperature, the thermostat should be on-state. - If resistance infinite: Thermostat defective (when cold) or flue gas thermostat has tripped (if the temperature is higher than or equal to 70 C). See electrical diagram in section Air pressure switch control (FF versions only) Switch off the mains supply Disconnect the pressure switch wires Measure the ohmic value on the pressure switch terminals: - Check on standby: If there is no pressure, the resistance is infinite. - Functional control: Blowing into the pipe causes the air pressure switch contact to close (you will hear a click). When the contact is closed, the resistance on the pressure switch terminals is 0 Ohm

105 5.14 Replacing the main exchanger To do this, proceed as follows: Switch off the mains supply Drain the boiler. Remove the front panel Disconnect the ignition electrode cable, Remove the front plate from the combustion chamber (4 screws). Remove the burner drawer (4 screws): Use the special screwdriver, reference Remove the pin on either side of the main exchanger. Screwdriver: Reference Reassembly: To reassemble correctly, take care to position the two tabs at the bottom of the front plate of the combustion chamber correctly in the notches provided in the combustion chamber. Be careful when re-assembling! (... FF Versions )

106 6. Gas settings - Gas conversion procedure 6.1 Propane conversion kit Only a qualified engineer may carry out the following operations. The boilers are set for natural gas (G20, G25) and can be converted to run on propane (G31). MS_Q0004 Propane conversion kit for MS 24, MS 24 FF, MS 24 MI, MS 24 MI FF : Package HX28 Reference for MS 24 BIC, MS 24 BIC FF : Package HX29 Reference Gas conversion procedure 1. Replacing the nozzles: Use the special screwdriver, reference (Available in the spare part centre). ) Be careful when re-assem - Open the casing (MS 24 FF...) - Remove the combustion chamber plate - Carefully remove the burner drawer to access the nozzles. - Replace all nozzles (see the nozzle diameter according to gas type in the table below). - Screw the nozzles in tightly to prevent gas leaks. - Reassembly: To reassemble correctly, take care to position the two tabs at the bottom of the front plate of the combustion chamber correctly in the notches provided in the combustion chamber. 7 6 Nozzles: Boiler type MS 24 FF - MS 24 MI FF MS 24, MS 24 MI - MS 24 MI VMC Gas type G20 G25 G31 G20 G25 G31* Nozzle diameter (mm) Number of nozzles * Except VMC model Boiler type MS 24 BIC FF MS 24 BIC Gas type G20 G25 G31 G20 G25 G31 Nozzle diameter(mm) Number of nozzles

107 2. Diaphragm: For operation with propane: MS 24 (FF), MS 24 MI (FF): - Remove the diaphragm located in the gas valve unit. MS 24 BIC (FF): - Install the diaphragm for operation on propane (See table below) MS 24 (FF), MS 24 MI (FF) Diaphragm MS 24 BIC (FF) Diaphragm Diaphragms Boiler type MS 24 FF - MS 24 MI FF MS 24, MS 24 MI - MS 24 MI VMC Gas type G20 G25 G31 G20 G25 G31* Internal diameter of the diaphragm (mm) * MS 24 MI VMC : No operation on propane Boiler type MS 24 BIC FF MS 24 BIC Gas type G20 G25 G31 G20 G25 G31 Internal diameter of the diaphragm (mm) Setting of parameter F02 MS 24 (FF) - MS 24 MI (FF) : For operation on propane, set parameter F02 to 01 For operation on natural gas (H or L), set parameter F02 to 02 MS 24 MI VMC: No operation on propane. For operation on natural gas (H or L): It is not necessary to modify parameter F02. MS 24 BIC (FF): It is not necessary to modify parameter F Adjusting the gas valve MS 24 (FF), MS 24 MI (FF) MS 24 BIC (FF) a b G To set or check the nozzle pressure according to gas type, refer to the values shown in the tables below and proceed as follows: 107

108 Gas pressure settings table: Boiler type MS 24 FF - MS 24 MI FF MS 24, MS 24 MI - MS 24 MI VMC Gas type G20 G25 G31 G20 G25 G31* Pressure at reduced output (mbar) Gas pressure at nominal output (mbar) * Except VMC model Boiler type MS 24 BIC FF MS 24 BIC Gas type G20 G25 G31 G20 G25 G31 Pressure at reduced output (mbar) Gas pressure at nominal output (mbar) Measuring the pressure: Connect the positive pressure outlet from a differential pressure gauge, preferably a water pressure gauge, to the pressure outlet (Pb) on the gas connection. For FF versions (Forced flue versions): Connect the negative outlet from the pressure gauge to a specific T-connection used to interconnect the boiler's pressure balancing outlet, the gas valve's pressure balancing outlet (Pc) and the pressure gauge itself. An equivalent measurement can be taken by connecting the pressure gauge to the pressure outlet (Pb), without the front panel of the sealed chamber; A measurement of the nozzle pressure taken without following the method described may be distorted owing to the fact that it did not take into account the vacuum created by the fan in the sealed chamber. Setting method 1: Operation at max and min output can be directly controlled from the boiler's control panel by proceeding as follows: Press the + + keys simultaneously for approximately 6 seconds. The symbols and flash The screen alternately displays 100 and the boiler temperature: The boiler runs at maximum output: 100 % To instantly modify the boiler's heating output from 0 % to 100 % or vice versa, press the + and - ( ) keys, To gradually modify the boiler's heating output (in intervals of 1 %), press the + and - ( ) keys. Turn the screw (a) to obtain the pressure shown at maximum output: Turn the screw (a) clockwise to inrease the nozzle pressure or anti-clockwise to reduce it. Turn the screw (b) to obtain the pressure shown at minimum output: Turn the screw (b) anti-clockwise to increase the nozzle pressure or clockwise to reduce it. To exit this function, press the key Measure the boiler's gas supply pressure at the pressure outlet (Pa) on the gas valve: 37 mbar for propane, 20 mbar for natural gas G20 or 25 mbar for natural gas G25. Make a note on the boiler's rating plate of the gas type and the setting made. Setting method 2: 6 Setting to nominal output: Open the gas inlet valve; Press the key and select the winter position ( + ) by successively pressing it. Open the drinking water draw-off tap so as to obtain a flow rate of at least 10 litres per minute or ensure that there is actually a demand for maximum heat; Remove the modulator cover; Adjust the brass screw (a) until you obtain the pressure shown in the table below; Measure the boiler's gas supply pressure at the pressure outlet (Pa) on the gas valve: 37 mbar for propane, 20 mbar for natural gas G20 or 25 mbar for natural gas G

109 Setting to reduced output: Disconnect the power cable on the valve modulator and unscrew the red screw (b) until you reach the pressure value that corresponds to reduced output (See table below); Reconnect the cable; Put the cover back on the modulator and tighten the holding screw. 5. Final checks Make a note on the boiler's rating plate of the gas type and the setting made

110 6 110

111 ELECTRICAL DIAGRAMS 7 111

112 Contents 1. Electrical diagram - MS 24 MI FF Electrical diagram - MS 24 MI - MS 24 MI VMC Electrical diagram - MS 24 FF Electrical diagram - MS Electrical diagram - MS 24 BIC FF Electrical diagram - MS 24 BIC

113 1. Electrical diagram - MS 24 MI FF 230 V main supply Low water pressure switch Ignition/ionization electrode Safety thermostat Reversal valve Boiler sensor (CTN) Boiler pump Outside sensor (Option) Gas valve Air pressure switch Fan Flowmeter CTN domestic hot water sensor Colour of the wires: C Sky blue M Brown N Black R Red G/V Green / Yellow B White V Green 7 113

114 2. Electrical diagram - MS 24 MI - MS 24 MI VMC V main supply Low water pressure switch Ignition/ionization electrode Safety thermostat Reversal valve Boiler sensor (CTN) Boiler pump Outside sensor (Option) Gas valve Flue gas thermostat Flowmeter CTN domestic hot water sensor Colour of the wires: C Sky blue M Brown N Black R Red G/V Green / Yellow B White V Green 114

115 3. Electrical diagram - MS 24 FF 230 V main supply Low water pressure switch Ignition/ionization electrode Safety thermostat Reversal valve Boiler sensor (CTN) Boiler pump Outside sensor (Option) Gas valve Air pressure switch Fan Colour of the wires: C Sky blue M Brown N Black R Red G/V Green / Yellow B White V Green 7 115

116 4. Electrical diagram - MS V main supply Safety thermostat Ignition/ionization electrode Boiler sensor (CTN) Reversal valve Outside sensor (Option) Boiler pump Flue gas thermostat Gas valve Low water pressure switch Colour of the wires: C Sky blue M Brown N Black R Red G/V Green / Yellow B White V Green 116

117 5. Electrical diagram - MS 24 BIC FF 230 V main supply Ignition/ionization electrode Reversal valve Boiler pump Gas valve Fan Flowmeter CTN domestic hot water sensor Low water pressure switch Safety thermostat Boiler sensor (CTN) Outside sensor (Option) Air pressure switch DHW load pump Control relay Colour of the wires: C Sky blue M Brown N Black R Red G/V Green / Yellow B White V Green 7 117

118 6. Electrical diagram - MS 24 BIC V main supply Ignition/ionization electrode Reversal valve Boiler pump Gas valve Flowmeter CTN domestic hot water sensor Low water pressure switch Safety thermostat Boiler sensor (CTN) Outside sensor Flue gas thermostat DHW load pump Control relay Colour of the wires: C Sky blue M Brown N Black R Red G/V Green / Yellow B White V Green 118

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120 Copyright In the interest of customers, DE DIETRICH THERMIQUE are continuously endeavouring to make improvements in product quality. All the specifications stated in this document are therefore subject to change without notice. DE DIETRICH THERMIQUE BP30 57 Rue de la Gare F MERTZWILLER Tel.: (+33) Fax: (+33)