DeDietrich Innovens MCA 25/28 BIC Installation And Service Manual
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DeDietrich Innovens MCA 25/28 BIC Installation And Service Manual

Wall-hung gas condensing boilers
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Innovens
Wall-hung gas condensing boilers
MCA 25/28 BIC
300022159-001-01
Installation and
Service Manual
EN

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Summary of Contents for DeDietrich Innovens MCA 25/28 BIC

  • Page 1 Innovens Wall-hung gas condensing boilers MCA 25/28 BIC Installation and Service Manual 300022159-001-01...

  • Page 2: Eg Declaration Of Conformity

    EG declaration of conformity The device complies with the standard type described in the EG declaration of conformity. It was manufactured and commissioned in accordance with European directives. The original of the declaration of compliance is available from the manufacturer. EG - VERKLARING VAN OVEREENSTEMMING EC - DECLARATION OF CONFORMITY EG - KONFORMITÄTSERKLÄRUNG...

  • Page 3: Table Of Contents

    Contents Introduction ....................6 Symbols used ............6 Abbreviations ............6 General ..............7 1.3.1 Manufacturer's liability ..........7 1.3.2 Installer's liability .............7 Homologations ............7 1.4.1 Certifications ............7 1.4.2 Equipment categories ..........8 1.4.3 Additional Directives ..........8 1.4.4 Factory test .............8 Safety instructions and recommendations ..........9 Safety instructions ..........9 Recommendations ..........9 Technical description ................11...
  • Page 4 Contents Installing the mounting frame ......19 Positioning the boiler .........19 Hydraulic connections ........20 4.6.1 Flushing the system ..........20 4.6.2 Connection of the heating circuit ......21 4.6.3 Connection of the water circuit for domestic use ................21 4.6.4 Connecting the expansion vessel ......22 4.6.5 Connecting the condensate discharge pipe ..23 Gas connection ...........23...
  • Page 5 Commissioning the boiler ........51 Gas settings ............52 5.4.1 Adapting to another gas type ........52 5.4.2 Setting the air/gas ratio (Full load) ......53 5.4.3 Setting the air/gas ratio (Part load) ......54 5.4.4 Basic setting for the gas/air ratio ......56 Checks and adjustments after commissioning ...........56 5.5.1 Displaying the parameters in extended...
  • Page 6 Contents 7.4.10 Checking the burner and cleaning the heat exchanger .............87 Specific maintenance operations ......88 7.5.1 Replacing the ionization/ignition electrode ....88 7.5.2 Cleaning the plate exchanger .......89 7.5.3 Replacing the boiler tanks ........90 7.5.4 Replacing the 3-way valve ........91 7.5.5 Replacing the non-return valve ......92 7.5.6 Assembling the boiler ..........93...
  • Page 7 15/06/12 - 300022159-001-01...

  • Page 8: Introduction

    1. Introduction MCA 25/28 BIC Introduction Symbols used In these instructions, various danger levels are employed to draw the user's attention to particular information. In so doing, we wish to safeguard the user's safety, obviate hazards and guarantee correct operation of the appliance. DANGER Risk of a dangerous situation causing serious physical injury.

  • Page 9: General

    MCA 25/28 BIC 1. Introduction General 1.3.1. Manufacturer's liability Our products are manufactured in compliance with the requirements of the various applicable European Directives. They are therefore delivered with [ marking and all relevant documentation. In the interest of customers, we are continuously endeavouring to make improvements in product quality.

  • Page 10: Equipment Categories

    1. Introduction MCA 25/28 BIC 1.4.2. Equipment categories Gas category Gas type Connection pressure (mbar) Natural gas H (G20) 20 2ESi3P Natural gas L (G25) 25 Propane (G31) The boiler is preset in the factory to operate on natural gas H (G20). ¼...

  • Page 11: Safety Instructions And Recommendations

    MCA 25/28 BIC 2. Safety instructions and recommendations Safety instructions and recommendations Safety instructions DANGER If you smell gas: Do not use a naked flame, do not smoke, do not operate electrical contacts or switches ( doorbell, light, motor, lift, etc..). Shut off the gas supply.
  • Page 12 2. Safety instructions and recommendations MCA 25/28 BIC Only remove the casing for maintenance and repair operations. Put the casing back in place after maintenance and repair operations. Instructions stickers The instructions and warnings affixed to the appliance must never be removed or covered and must remain legible during the entire lifespan of the appliance.

  • Page 13: Technical Description

    MCA 25/28 BIC 3. Technical description Technical description General description Wall-hung gas condensing boilers 4 High efficiency heating. 4 Low pollutant emissions. 4 Top of the range electronic DIEMATIC iSystem control panel. 4 Installation and connection facilitated by the mounting frame delivered with the appliance.

  • Page 14: Operating Principle

    3. Technical description MCA 25/28 BIC Heat exchanger (Heating circuit) Calorifier tank Ignition/ionization electrode Expansion vessel (Heating circuit) Air intake Operating principle 3.3.1. Skeleton Diagrams Heat exchanger (Heating circuit) Hydroblocks Plate heat exchanger (DHW circuit) Heating flow Domestic hot water outlet Domestic cold water inlet Heating return Shunt pump (DHW circuit)

  • Page 15: Water Flow Rate

    MCA 25/28 BIC 3. Technical description ¼ See chapter: "Professional settings", page 68. 3.3.3. Water flow rate The boiler's modulating control system limits the maximum difference in temperature between the heating flow and return and the maximum speed at which the flow temperature increases. In this way, the boiler does not require a minimum water flow rate.

  • Page 16: Sensor Characteristics

    3. Technical description MCA 25/28 BIC Boiler type MCA 25/28 BIC Manometric height central heating circuit (∆T = 20K) mbar Characteristics of the domestic hot water circuit Specific hot water flow D (60 °C) l/min Specific hot water flow D (30 °C) l/min 20,0 Domestic water resistance...

  • Page 17: Installation

    MCA 25/28 BIC 4. Installation Installation Regulations governing installation WARNING Installation of the appliance must be done by a qualified engineer in accordance with prevailing local and national regulations. Package list 4.2.1. Standard delivery The delivery includes: 4 The boiler, fitted with a connection cable 4 Mounting frame 4 Mounting template 4 Connection kit...

  • Page 18: Choice Of The Location

    4. Installation MCA 25/28 BIC Choice of the location 4.3.1. Data plate The data plate located on top of the boiler provides important information on the appliance: serial number, model, gas category, etc. T001539-B 4.3.2. Location of the boiler 4 Before mounting the boiler, decide on the ideal position for mounting, bearing the Directives and the dimensions of the appliance in mind.

  • Page 19: Ventilation

    MCA 25/28 BIC 4. Installation 4.3.3. Ventilation Distance between the front of the boiler and the internal n . 6 wall of the casing box. Distance to allow on either side of the boiler. If the boiler is installed in a closed casing, respect the minimum dimensions given in the diagram opposite.

  • Page 20: Main Dimensions

    4. Installation MCA 25/28 BIC 4.3.4. Main dimensions 257,5 T001962-A Connection of the combustion gas exhaust pipe Ø 60 mm Connection of the air intake pipe Ø 100 mm ê Safety valve outlet pipe Ø 25 mm Condensates discharge Ø 25 mm Heating circuit return G¾"...

  • Page 21: Installing The Mounting Frame

    MCA 25/28 BIC 4. Installation Installing the mounting frame The boiler is delivered with a mounting template. 1. Position the mounting template to the wall with adhesive tape. CAUTION Using a spirit level, check that the mounting axis is perfectly horizontal. 2.

  • Page 22: Hydraulic Connections

    4. Installation MCA 25/28 BIC 2. Fit a fibre gasket to each joint on the valve plate. T001627-A 3. Position the boiler above the plumbing fixtures plate and locate it against the mounting frame. Gently lower the boiler. 4. Tighten the valve nuts on the boiler. T001872-A Hydraulic connections 4.6.1.

  • Page 23: Connection Of The Heating Circuit

    MCA 25/28 BIC 4. Installation 4 Flush the installation. 4 Clean the installation with a universal cleaner to eliminate debris from the appliance (copper, hemp, flux). 4 Thoroughly flush the installation until the water runs clear and shows no impurities. 4.6.2.

  • Page 24: Connecting The Expansion Vessel

    4. Installation MCA 25/28 BIC Connection by internal brazing ∅ 16 mm Connection by internal brazing ∅ 16 mm CAUTION The domestic water pipes must be connected in accordance with prevailing provisions. If using synthetic pipes, follow the manufacturer's (connection) instructions. T001626-B 4.6.4.

  • Page 25: Connecting The Condensate Discharge Pipe

    MCA 25/28 BIC 4. Installation 4.6.5. Connecting the condensate discharge pipe 1. Mount a standard drainage pipe, Ø 32 mm or more, leading to the mains drainage system. 2. Mount the flow collector. 3. Into this, insert the condensate collector hose coming from the siphon j and the safety valve ê...

  • Page 26: Flue Gas System Connections

    4. Installation MCA 25/28 BIC Flue gas system connections 4.8.1. Classification B 33 C 83(x) C 33(x) C 43(x) C 83(x) C 43(x) B 23P B 33 C 33(x) C 13(x) C 83(x) B 23P C 93(x) C 33(x) C 43(x) C 53 C 93(x) C002339-C...

  • Page 27: Lengths Of The Air/Flue Gas Pipes

    MCA 25/28 BIC 4. Installation Configuration C 93(x) Air/flue gas connection by concentric pipes in the boiler room and single pipes in the chimney (combustive air in counter current in the chimney) Configuration C 93(x) Air/flue gas connection by concentric pipes in the boiler room and single flex in the chimney (combustive air in counter current in the chimney) WARNING...

  • Page 28: Additional Directives

    4. Installation MCA 25/28 BIC WARNING Maximum length = lengths of the straight air/flue gas ducts + equivalent lengths of other components The max length in the flue gas pipe (configurations C ) of the elbow bracket at the outlet must not exceed: 4 30 m for rigid PPS 4 25 m for flexible PPS If longer lengths are used, holding clamps must be added per sections...

  • Page 29: Installing The Outside Sensor

    MCA 25/28 BIC 4. Installation Installing the outside sensor 4.9.1. Choice of the location It is important to select a place that allows the sensor to measure the outside conditions correctly and effectively. Advised positions: 4 on one face of the area to be heated, on the north if possible 4 half way up the wall in the room to be heated 4 under the influence of meteorological variations 4 protected from direct sunlight...

  • Page 30: 4.10 Electrical Connections

    4. Installation MCA 25/28 BIC Inserts Ø4 wood screw ¼ For the connection of the outside temperature sensor, refer to the chapter "Electrical Connections". 8800N003-C 4.10 Electrical connections 4.10.1. Control unit The boiler is fully pre-wired. The mains supply is made via the cable C connected to the mains.

  • Page 31: Recommendations

    MCA 25/28 BIC 4. Installation 4.10.2. Recommendations WARNING Only qualified professionnals may carry out electrical connections, always with the power off. The boiler is entirely pre-wired. Do not modify the connections inside the control panel. Earth the appliance before making any electrical connections.

  • Page 32: Position Of The Pcbs

    4. Installation MCA 25/28 BIC 4.10.3. Position of the PCBs TS + On/off 0-10V S AMB C S AMB B S AMB A Tout Tdhw 4 3 2 1 2 1 TS + S SYST + TA - S ECS S EXT S DEP C S DEP B C002299-F...

  • Page 33: Accessing The Connection Terminal Blocks

    MCA 25/28 BIC 4. Installation 4.10.4. Accessing the connection terminal blocks To access the connection terminal blocks, proceed as follows: 1. Unscrew the 2 screws under the front panel by a quarter turn. 2. Remove the front panel. C002325-C 3. Open the holding clips located on the sides. 4.
  • Page 34 4. Installation MCA 25/28 BIC 5. Lift the clip located in front of the control panel. 6. Lift the control panel cover. C002327-B 7. Unclip the PCB cover. C002330-C 15/06/12 - 300022159-001-01...

  • Page 35: Connecting A Direct Heating Circuit

    MCA 25/28 BIC 4. Installation 4.10.5. Connecting a direct heating circuit On/off 0-10V S AMB C S AMB B S AMB A Tout Tdhw 4 3 2 1 2 1 TS + S SYST + TA - S ECS S EXT S DEP C S DEP B C002304-M Do not connect anything to the terminal block.

  • Page 36: Connecting Two Heating Circuits

    4. Installation MCA 25/28 BIC 4.10.6. Connecting two heating circuits TS + On/off 0-10V S AMB C S AMB B S AMB A Tout Tdhw 4 3 2 1 2 1 TS + S SYST + TA - S ECS S EXT S DEP C S DEP B C003036-A...

  • Page 37: Hot Water Storage Tank Connection (Type Ps)

    MCA 25/28 BIC 4. Installation Connect the heating pump (circuit A). If underfloor heating is being used, put a safety thermostat in place after the heating pump. The safety thermostat will shut down the heating pump in the event of overheating. Low loss header.
  • Page 38 4. Installation MCA 25/28 BIC Connect the DHW tank anode. If the tank is not fitted with an impressed current anode, put the simulation connector in place (delivered with the DHW sensor - package AD212). PS storage tank. Solar sensor probe. Connect the solar station to the solar collectors.

  • Page 39: Pool Connection

    MCA 25/28 BIC 4. Installation 4.10.8. Pool connection On/off 0-10V S AMB C S AMB B S AMB A Tout Tdhw 4 3 2 1 2 1 TS + S SYST + TA - S ECS S EXT S DEP C S DEP B C002298-i Connect the secondary swimming pool pump.

  • Page 40: Connecting The Options

    4. Installation MCA 25/28 BIC n Controlling the pool circuit The control system can be used to manage a swimming pool circuit in both cases: Case 1: The control system regulates the primary circuit (boiler/ exchanger) and the secondary circuit (exchanger/pool). 4 Connect the primary circuit pump (boiler/exchanger) to the MB outlet on the connection terminal block.
  • Page 41 MCA 25/28 BIC 4. Installation TS + On/off 0-10V S AMB C S AMB B S AMB A Tout Tdhw 4 3 2 1 2 1 TS + S SYST + TA - S ECS S EXT S DEP C S DEP B MODE TELCOM 2...

  • Page 42: 4.11 Electrical Diagram

    4. Installation MCA 25/28 BIC 4.11 Electrical diagram 3 2 1 1 2 3 2 3 4 1 1 2 3 1 2 3 1 2 3 2 3 4 5 GN/YW 1 2 4 5 SCU-C X117 X121 PUMP B PUMP A 230V, 50Hz 10 11...

  • Page 43: 4.12 Filling The System

    MCA 25/28 BIC 4. Installation 4.12 Filling the system 4.12.1. Water treatment In most cases, the boiler and the central heating installation can be filled with normal tap water and no water treatment will be necessary. WARNING Do not add chemical products to the central heating water without first consulting a water treatment professional.

  • Page 44: Filling The Siphon

    4. Installation MCA 25/28 BIC 4.12.2. Filling the siphon 1. Remove the siphon. 2. Fill the siphon with water. This must be filled up to the level markers. 3. Re-assemble the siphon. CAUTION Fill the water siphon before starting the boiler to avoid combustion products escaping from the boiler.
  • Page 45 MCA 25/28 BIC 4. Installation 3. Close the disconnector valves when the manometer indicates a pressure of 2 bar 2 bar T001619-A 4. Check the tightness of the water connections. T001507-B 15/06/12 - 300022159-001-01...

  • Page 46: Commissioning

    5. Commissioning MCA 25/28 BIC Commissioning Control panel 5.1.1. Description of the keys AUTO Temperature setting key (heating, DHW, swimming pool) Operating mode selection key DHW override key Key to access the parameters reserved for the installer Keys on which the function varies as and when selections are made Rotary setting button: Turn the rotary button to scroll through the menus or...

  • Page 47: Description Of The Display

    MCA 25/28 BIC 5. Commissioning 5.1.2. Description of the display n Key functions Access to the various menus > Used to scroll through the menus Used to scroll through the parameters The symbol is displayed when help is available Used to display the curve of the parameter selected <...

  • Page 48: Operating Modes

    5. Commissioning MCA 25/28 BIC n Solar (If connected) The solar load pump is running The top part of the tank is reheated to the tank set point The entire tank is reheated to the tank set point < AUTO The entire tank is reheated to the solar tank set point The tank is not loaded - Presence of the solar control system...

  • Page 49: System Pressure

    MCA 25/28 BIC 5. Commissioning n System pressure Pressure indicator: The symbol is displayed when a water pressure sensor is connected. Flashing symbol: The water pressure is insufficient. Steady symbol: The water pressure is sufficient. Water pressure level < AUTO R : 0,9 to 1,1 bar E : 1,2 to 1,5 bar Z : 1,6 to 1,9 bar...

  • Page 50: Access To The Various Browsing Levels

    5. Commissioning MCA 25/28 BIC 5.1.3. Access to the various browsing levels n User level The information and settings in the User level can be accessed by everyone. 1. Press the > key. SUNDAY 11:45 < AUTO C002219-D-04 n Installer level The information and settings in the Installer level can be accessed by experienced people.

  • Page 51: Browsing In The Menus

    MCA 25/28 BIC 5. Commissioning n After Sales level The After Sales Service information and settings can be accessed by the professional providing the After Sales Service. 1. Press the > key. SUNDAY 11:45 < AUTO C002219-D-04 2. Press key - for around 5 seconds. It is also possible to access the After Sales level by SUNDAY 11:45 pressing only the - key for around 10 seconds.

  • Page 52: Check Points Before Commissioning

    5. Commissioning MCA 25/28 BIC 5. To modify the parameter, turn the rotary button. 6. To confirm, press the rotary button. CURRENT PROG.C "Choice of the timeprogram applied C" To cancel, press key h . < AUTO C002222-C-04 7. To go back to the main display, press key j 2 times. It is possible to use the ( and ' keys instead of the rotary LUNDI 11:45 button.

  • Page 53: Gas Circuit

    MCA 25/28 BIC 5. Commissioning 5.2.2. Gas circuit WARNING 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.

  • Page 54: Gas Settings

    5. Commissioning MCA 25/28 BIC 4. Turn on the boiler using the on/off switch. C002366-B 5. The first time the boiler is powered up, the LANGUAGE menu is displayed. Select the desired language by turning the rotary button. LANGUE FRANCAIS Français - Deutsch - English - Italiano - Espanol - Nederlands 6.

  • Page 55: Setting The Air/Gas Ratio (Full Load)

    MCA 25/28 BIC 5. Commissioning ¼ See chapter: "Professional settings", page 68 5.4.2. Setting the air/gas ratio (Full load) 1. Unscrew the plug of the flue gas measurement point. 2. Connect the flue gas analyser. WARNING Ensure that the opening around the sensor is completely sealed when taking measurements.

  • Page 56: Setting The Air/Gas Ratio (Part Load)

    5. Commissioning MCA 25/28 BIC control and setting values for gas H (G20) at full load Boiler type Setting value Checking value MCA 25/28 BIC 5,2 ± 0,4 8,8 ± 0,2 5,2 ± 0,5 8,8 ± 0,3 control and setting values for gas L (G25) at full load Boiler type Setting value Checking value...
  • Page 57 MCA 25/28 BIC 5. Commissioning 6. If this rate does not match the required value, correct the gas/air ratio using the adjustment screw B on the gas valve unit. Turn the screw B anticlockwise to obtain a lower value. Turn the screw B clockwise to obtain a higher CO value.

  • Page 58: Basic Setting For The Gas/Air Ratio

    5. Commissioning MCA 25/28 BIC 5.4.4. Basic setting for the gas/air ratio If the gas/air ratio is out of adjustment, the gas valve unit has a basic setting. To do this, proceed as follows: 1. Switch off the boiler electrical power supply. 2.

  • Page 59: Setting The Parameters Specific To The Installation

    MCA 25/28 BIC 5. Commissioning Regardless of what is done to the keys, the regulator switches back to CLASSIC mode after 30 minutes. 5.5.2. Setting the parameters specific to the installation 1. Access the installer level: Press key - for around 5 seconds. 2.
  • Page 60 5. Commissioning MCA 25/28 BIC Installer level - #SYSTEM menu Parameter Adjustment range Description Factory setting Customer setting Use of a tank load pump on the Mr outlet PUMP P.DHW: Use of a reversal valve for DHW production Small capacity tank BS60 Large capacity tank Use as a domestic loop pump...
  • Page 61 MCA 25/28 BIC 5. Commissioning Installer level - #SYSTEM menu Parameter Adjustment range Description Factory setting Customer setting Start anti-freeze in boiler command ANTIFR ANTIFR I.TEL: ON or OFF contact: I.TEL: can be used as an 0/1 A antifreeze activation inlet on circuit A ON or OFF contact: I.TEL: can be used as an 0/1 B antifreeze activation inlet on circuit B...
  • Page 62 5. Commissioning MCA 25/28 BIC Influence of the parameter setting CT.TEL on the I.TEL: contact CT.TEL I.TEL: C contact closed C contact open The antifreeze mode is active on all boiler circuits. The mode selected on the boiler is active. CLOSE ANTIFR The mode selected on the circuit is active.

  • Page 63: Naming The Circuits And Generators

    MCA 25/28 BIC 5. Commissioning Influence of the parameter setting CT.TEL on the I.TEL: contact CT.TEL I.TEL: C contact closed C contact open The mode selected on the boiler is active. The antifreeze mode is active on all boiler circuits. OPEN ANTIFR The antifreeze mode is active on the circuit...

  • Page 64: Setting The Heating Curve

    5. Commissioning MCA 25/28 BIC 3. Select the circuit or generator you wish to rename. Installer level - Menu #NAMES OF THE CIRCUITS Parameter Description Name given by the customer Circuit A CIRC. A: Circuit B CIRC. B: Circuit C CIRC.
  • Page 65 MCA 25/28 BIC 5. Commissioning 3. Select the parameter CIRC. CURVE ..BUILD.INERTIA CIRC.CURVE B CIRC.CURVE C SCREED DRYING < AUTO C002316-E-04 4. To modify the value directly, turn the rotary button. To modify the value by displaying the curve, press key f . CIRC.CURVE B "Slope of the heatcurve of the circuit B"...

  • Page 66: Finalizing Work

    5. Commissioning MCA 25/28 BIC n Heating curve with BCT The BCT (Base heat Curve Temperature) parameter allows a minimum operating temperature to be imposed on the heating circuit (this temperature may be constant if the circuit gradient is nil). Maximum temperature of the circuit C°...

  • Page 67: Reading Out Measured Values

    MCA 25/28 BIC 5. Commissioning Reading out measured values The various values measured by the appliance are displayed in the #MEASURES menu. 1. To access user level: Press the > key. 2. Select the menu #MEASURES. SUNDAY 11:45 Turn the rotary button to scroll through the menus or modify a value.

  • Page 68: Changing The Settings

    5. Commissioning MCA 25/28 BIC Changing the settings The boiler control panel is set for the most common heating systems. With these settings, practically all heating systems operate correctly. The user or installer can optimise the parameters according to own preferences. ¼...
  • Page 69 MCA 25/28 BIC 5. Commissioning User level - Menu #SETTING Parameter Adjustment range Description Factory setting Customer setting 15 to 30 °C Used to set the outside temperature above 22 °C SUM/WIN which heating will be shut down. The heating pumps are shut down. The burner will only start for domestic hot water needs.

  • Page 70: Professional Settings

    5. Commissioning MCA 25/28 BIC 5.7.3. Professional settings 1. Access the installer level: Press key - for around 5 seconds. 2. Set the following parameters: SUNDAY 11:45 Turn the rotary button to scroll through the menus or TEMP.: 68° modify a value. Press the rotary button to access the selected menu <...
  • Page 71 MCA 25/28 BIC 5. Commissioning Installer level - Menu #SECONDARY LIMITS Parameter Adjustment range Description Factory setting 20 to 95 °C Maximum temperature (Circuit A) 75 °C MAX.CIRC.A ¼ "MAX.CIRC...", page 72 20 to 95 °C Maximum temperature (Circuit B) 50 °C MAX.CIRC.B ¼...
  • Page 72 5. Commissioning MCA 25/28 BIC Installer level - Menu #SECONDARY INSTAL.P Parameter Adjustment range Description Factory Customer setting setting 0 (10 hours) to 10 Characterisation of building's inertia: 3 (22 hours) BUILD. INERTIA (50 hours) 0 for a building with low thermal inertia. 3 for a building with normal thermal inertia.
  • Page 73 MCA 25/28 BIC 5. Commissioning Installer level - Menu #SECONDARY INSTAL.P Parameter Adjustment range Description Factory Customer setting setting The lower temperature is maintained DEC. DEC. NIGHT (Night mode) ¼ "NIGHT", page 74 The boiler is stopped (Night mode) STOP ¼...
  • Page 74 5. Commissioning MCA 25/28 BIC Installer level - Menu #SECONDARY INSTAL.P Parameter Adjustment range Description Factory Customer setting setting The anti legionella function acts to LEG PROTEC prevent the development of legionella in the dhw tank, these bacteria are responsible for legionellosis. Anti-legionella function not activated The tank is overheated every day from DAILY...
  • Page 75 MCA 25/28 BIC 5. Commissioning n CIRC. CURVE ... Heating curve circuit A, B or C Outside temperature (°C) Water flow temperature (°C) Maximum temperature of the circuit B - C M001678-B n ANTICIP.A, ANTICIP.B, ANTICIP.C Room temperature instruction - Comfort Room temperature instruction - Low Time schedule 0,5K...
  • Page 76 5. Commissioning MCA 25/28 BIC STOP DRYING TEMP START DRYING TEMP Today NB DAYS DRYING Normal regulation (End of drying) Heating temperature setting (°C) 00:00 00:00 00:00 For example STOP DRYING TEMP: 47 °C START DRYING TEMP: 20 °C NB DAYS DRYING Normal regulation (End of drying) Heating temperature setting (°C) Every day at midnight (00:00): the set point (START...

  • Page 77: Configuring The Network

    MCA 25/28 BIC 5. Commissioning 4 When the room temperature is higher than the room sensor set point: Heating is shut down during reduced periods. When installation antifreeze is active, the reduced temperature is maintained during reduced periods. n Function 0-10 V This function controls the boiler using an external system that includes a 0-10 V output connected to the 0-10 V input.
  • Page 78 5. Commissioning MCA 25/28 BIC Installer level - Menu #NETWORK Parameter Adjustment range Description Factory setting Customer setting ON / NO ON: System in cascade CASCADE: Specific menu: Enlist VMs in cascade VM NETWORK mode ¼ See chapter: "Connecting VM iSystem in cascade", page ON / NO Configure this control system as MASTER CONTROLLER...
  • Page 79 MCA 25/28 BIC 5. Commissioning 2. Select SYSTEM NETWORK and press the rotary button to go to the specific menu. CASCADE MASTER CONTROLER SYSTEM NETWORK FUNCT TRADITIONAL INTER STAGE TIMER < AUTO C002409-C-04 3. To add a slave appliance to the network, select ADD SLAVE. NB.NETWORK ELEMENTS ADD SLAVE ERASE NETWORK...

  • Page 80: Return To The Factory Settings

    5. Commissioning MCA 25/28 BIC n Connecting VM iSystem in cascade It is possible to assign VMs only as slaves. Proceed as follows: 1. Select VM NETWORK and press the rotary button to go to the specific menu. 2. The screen displayed is used to select the numbers of the slave VMs to be added to the network.
  • Page 81 MCA 25/28 BIC 5. Commissioning After reset (TOTAL RESET and RESET EXCEPT PROG.), the control system goes back to the display of the language choice after a few seconds. LANGUE FRANCAIS Français - Deutsch - English - Italiano - Espanol - Nederlands 1.

  • Page 82: Switching Off The Boiler

    6. Switching off the boiler MCA 25/28 BIC Switching off the boiler Installation shutdown CAUTION Do not switch off the mains supply to the appliance. If the central heating system is not used for a long period, we recommend activating the HOLIDAYS mode (to ensure the anti-grip of the heating pump).

  • Page 83: Checking And Maintenance

    MCA 25/28 BIC 7. Checking and maintenance Checking and maintenance General instructions WARNING Maintenance operations must be done by a qualified engineer. An annual inspection is compulsory. Only original spare parts must be used. 4 Have the flues swept at least once a year or more, depending on the regulations in force in your country.

  • Page 84: Customising Maintenance

    7. Checking and maintenance MCA 25/28 BIC Menu #EMISSION MEASUREMENTS Generator Function available Description Values displayed Generator name AUTO normal operation °C BOILER TEMP. µA CURRENT WIND SPEED °C BACK TEMP Operating at minimum output °C PMIN BOILER TEMP. µA CURRENT WIND SPEED °C...

  • Page 85: Contact Details Of The Professional For After Sales Support

    MCA 25/28 BIC 7. Checking and maintenance Clearing the maintenance message: After carrying out the maintenance operations, modify the date in the #REVISION menu to clear the message. In the event of maintenance before the maintenance message is displayed: After carrying out early maintenance operations, it is necessary to set a new date in the #REVISION menu.

  • Page 86: Checking The Hydraulic Pressure

    7. Checking and maintenance MCA 25/28 BIC 7.4.1. Checking the hydraulic pressure The hydraulic pressure must reach a minimum of 0,8 bar. If the hydraulic pressure is lower than 0,8 bar, the symbol bar flashes. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1,5 and 2 bar).

  • Page 87: Checking Combustion

    MCA 25/28 BIC 7. Checking and maintenance 7.4.6. Checking combustion The check on combustion is done by measuring the percentage of in the flue gas discharge flue. To do this, proceed as follows: 1. Unscrew the plug of the flue gas measurement point. 2.

  • Page 88: Checking The Automatic Air Vent

    7. Checking and maintenance MCA 25/28 BIC 7.4.7. Checking the automatic air vent 1. Switch off the boiler electrical power supply. 2. Close the gas valve on the boiler. 3. Close the main gas inlet valve. Gas/Gaz 4. Unscrew the two screws located under the front panel by a quarter turn and remove the panel.

  • Page 89: Checking The Burner And Cleaning The Heat Exchanger

    MCA 25/28 BIC 7. Checking and maintenance 7.4.10. Checking the burner and cleaning the heat exchanger CAUTION During inspection and maintenance operations, always replace all gaskets on the parts removed. 1. Remove the air inlet flue on the venturi. 2. Unscrew the top connection on the gas valve unit. 3.

  • Page 90: Specific Maintenance Operations

    7. Checking and maintenance MCA 25/28 BIC Specific maintenance operations If the standard inspection and maintenance operations have revealed the necessity to carry out additional maintenance work, proceed as follows, depending on the nature of the work: 7.5.1. Replacing the ionization/ignition electrode Replace the ionization/ignition electrode in the following cases: 4 Ionization current <3 µA.

  • Page 91: Cleaning The Plate Exchanger

    MCA 25/28 BIC 7. Checking and maintenance 7.5.2. Cleaning the plate exchanger Depending on the water quality and the operating mode, limescale deposits may form in the plate exchanger. Periodic descaling may therefore be necessary. As a general rule, a periodic inspection, along with cleaning, if necessary, is sufficient.

  • Page 92: Replacing The Boiler Tanks

    7. Checking and maintenance MCA 25/28 BIC 7.5.3. Replacing the boiler tanks Replace the boiler tanks when they are defective. To do this, proceed as follows: 1. Close the main water valve. 2. Remove the air vent hose above the siphon. 3.

  • Page 93: Replacing The 3-Way Valve

    MCA 25/28 BIC 7. Checking and maintenance 7.5.4. Replacing the 3-way valve If it becomes necessary to replace the 3-way valve, proceed as follows: 1. Close the main water valve 2. Drain the boiler. 3. Remove the air vent hose above the siphon. 4.

  • Page 94: Replacing The Non-Return Valve

    7. Checking and maintenance MCA 25/28 BIC 7.5.5. Replacing the non-return valve Replace the nonreturn valve when faulty or when the maintenance kit contains one. To do this, proceed as follows: 1. Remove the air inlet flue on the venturi. 2.

  • Page 95: Assembling The Boiler

    MCA 25/28 BIC 7. Checking and maintenance 7.5.6. Assembling the boiler 1. Follow the procedure in reverse to re-assemble all of the components. CAUTION During inspection and maintenance operations, always replace all gaskets on the parts removed. 2. Fill the siphon with clean water up to the mark. 3.

  • Page 96: Troubleshooting

    8. Troubleshooting MCA 25/28 BIC Troubleshooting Anti-hunting When the boiler is in Anti-short-cycle operating mode, the symbol ? flashes. 1. Press the "?" key. The message Operation assured when the restart temperature will be reached is displayed. This message is not an error message but an item of information.
  • Page 97 MCA 25/28 BIC 8. Troubleshooting Code Messages Description Checking / solution Maximum difference between The water flow in the installation is insufficient BL.DT OUTL RET. the flow and return Check the circulation (direction, pump, valves) temperature exceeded Check the water pressure Check the cleanliness of the heat exchanger Sensor error Check that the sensors are operating correctly...
  • Page 98 8. Troubleshooting MCA 25/28 BIC Code Messages Description Checking / solution No flame during operation No ionization current BL.FLAME LOS Purge the gas supply to remove air Check that the gas valve is fully opened Check the supply pressure Check the operation and setting of the gas valve unit Check that the air inlet and flue gas discharge flues are not blocked Check that there is no recirculation of flue gases...

  • Page 99: Message History

    MCA 25/28 BIC 8. Troubleshooting Message history The menu (#MESSAGE HISTORIC) is used to consult the last 10 messages displayed by the control panel. 1. Access the "After Sales" level: Hold down the - key until #PARAMETERS is displayed. 2. Select the menu (#MESSAGE HISTORIC). SUNDAY 11:45 TEMP.: _ _ _ _ Turn the rotary button to scroll through the menus or...
  • Page 100 8. Troubleshooting MCA 25/28 BIC 3. Press the ? key. Follow the instructions displayed to solve the problem. 4. Consult the meaning of the codes in the table below: SUNDAY 11:45 TEMP. : 68° PCU COM.FAIL D27 < AUTO C002302-D-04 Code Faults Cause Description...
  • Page 101 MCA 25/28 BIC 8. Troubleshooting Code Faults Cause Description Checking / solution of the fault Boiler temp too low Bad connection DEF.OUTLET S. Check the wiring between the PCU PCB and the sensor Check that the SU PCB is correctly in place Check that the sensor has been correctly fitted Sensor fault Check the Ohmic value of the sensor...
  • Page 102 8. Troubleshooting MCA 25/28 BIC Code Faults Cause Description Checking / solution of the fault Return temperature too low Bad connection BACK S.FAILURE Check the wiring between the PCU PCB and the sensor Check that the SU PCB is correctly in place Check that the sensor has been correctly fitted Sensor fault Check the Ohmic value of the sensor...
  • Page 103 MCA 25/28 BIC 8. Troubleshooting Code Faults Cause Description Checking / solution of the fault Difference between the flow Sensor fault RET-DEP>MAX and return temperatures too Check the Ohmic value of the sensor great Replace the sensor if necessary Bad connection Check that the sensor has been correctly fitted No water circulation Vent the air in the heating system...
  • Page 104 8. Troubleshooting MCA 25/28 BIC Code Faults Cause Description Checking / solution of the fault Detection of a parasite flame Ionization current present when there should not be a PARASIT FLAME flame Ignition transformer defective Check the ionization/ignition electrode Gas valve defective Check the gas valve and replace if necessary The burner remains very hot: CO too high...
  • Page 105 MCA 25/28 BIC 8. Troubleshooting Code Faults Cause Description Checking / solution of the fault The BL inlet opened for a short Bad connection BL OPEN FAIL time Check the wiring External cause Check the device connected to the BL contact Parameter incorrectly set Check the parameter IN.BL HRU/URC unit test error...
  • Page 106 8. Troubleshooting MCA 25/28 BIC Code Faults Cause Description Checking / solution of the fault System sensor fault Bad connection SYST.SENS.FAIL. ¼ Check whether the sensor is connected: See chapter: "Deletion of sensors from the memory in the PCB", page 106 Check the link and the connectors Check that the sensor has been correctly fitted Sensor fault...
  • Page 107 MCA 25/28 BIC 8. Troubleshooting Code Faults Cause Description Checking / solution of the fault Swimming pool sensor fault Bad connection SWIM.P.B. S.FAIL circuit B SWIM.P.C. S.FAIL ¼ Check whether the sensor is connected: Swimming pool sensor fault See chapter: "Deletion of sensors from the circuit C memory in the PCB", page 106 Note:...

  • Page 108: Deletion Of Sensors From The Memory In The Pcb

    8. Troubleshooting MCA 25/28 BIC 8.4.1. Deletion of sensors from the memory in the The configuration of the sensors is memorised by the SCU PCB. If a sensor fault appears whilst the corresponding sensor is not connected or has been voluntarily removed, please delete the sensor from the SCU PCB memory.

  • Page 109: Parameter And Input/Output Check (Mode Tests)

    MCA 25/28 BIC 8. Troubleshooting Parameter and input/output check (mode tests) Use the following menus to target the cause of a malfunction. 1. Access the "After Sales" level: Hold down the - key until #PARAMETERS is displayed. 2. Check the following parameters: SUNDAY 11:45 TEMP.: _ _ _ _ Turn the rotary button to scroll through the menus or...
  • Page 110 8. Troubleshooting MCA 25/28 BIC After Sales level - Menu #PARAMETERS Parameter Description Water temperature in the DHW tank (1)(3) WATER TEMP. Voltage at input 0-10 V (1)(3) IN 0-10V Ionization current CURRENT Water pressure in the installation PRESSURE Water temperature in the storage tank STOR.TANK.TEMP Water temperature in the bottom of the DHW tank (1)(3)
  • Page 111 MCA 25/28 BIC 8. Troubleshooting After Sales level - Menu #TEST INPUTS Parameter Status Description ¼ See chapter: "Control system sequence", page SEQUENCE Control system sequence. Index of the generator in the system BOILER Generator type TYPE Presence of a remote control A R.CTRL A No remote control A Presence of a remote control B...

  • Page 112: Control System Sequence

    8. Troubleshooting MCA 25/28 BIC 8.6.1. Control system sequence Control system sequence Status Sub-status Operation Boiler stopped Anti-short cycle activated Reversal valve opening Start-up of the boiler pump Awaiting burner start-up Open gas valve (External) Fan start-up The fan switches to the burner start-up speed Check RL signal (Function not active) Burner on switch request Pre-ignition...

  • Page 113: Spare Parts

    MCA 25/28 BIC 9. Spare parts Spare parts General When it is observed subsequent to inspection or maintenance work that a component in the appliance needs to be replaced, use only original spare parts or recommended spare parts and equipment. To order a spare part, give the reference number shown on the list.

  • Page 114: Casing

    9. Spare parts MCA 25/28 BIC 9.2.1. Casing 1001 1006 1002 T001498-B EV 119526-1 15/06/12 - 300022159-001-01...

  • Page 115: Heat Exchanger And Burner

    MCA 25/28 BIC 9. Spare parts 9.2.2. Heat exchanger and burner 2026 2025 2029 2028 2019 2024 2018 2016 2017 2013 2014 2012 2015 2011 2034 2033 2001 2050 2015 2021 2011 2022 2034 2005 2020 2005 2032 2023 2006 2032 2002 2010...

  • Page 116: Fan

    9. Spare parts MCA 25/28 BIC 9.2.3. 3005 3003 3004 3002 3007 3011 3012 3008 3001 3008 3006 EV 119526-3 T001653-B 15/06/12 - 300022159-001-01...

  • Page 117: Control Panel

    MCA 25/28 BIC 9. Spare parts 9.2.4. Control panel 4022 4021 4019 4022 4018 4023 4030 4017 4024 4006 4008 4016 4007 4015 4008 4009 4002 4012 4011 4004 4010 4001 4014 4014 4009 4003 EV 119526-4 T001654-C 15/06/12 - 300022159-001-01...

  • Page 118: Connecting Pipes

    9. Spare parts MCA 25/28 BIC 9.2.5. Connecting pipes 5046 5039 5038 5044 5043 5049 5037 5048 5040 5041 5038 5012 5045 5047 5013 5012 5057 5013 5042 5056 5055 5018 5017 5010 5050 5016 5006 5007 5002 5023 5020 5017 5017 5001...

  • Page 119: Spare Parts List

    MCA 25/28 BIC 9. Spare parts 9.2.6. Spare parts list Markers Code no. Description Part Casing 1001 S101309 Front casing 1002 S101297 Top cover (Control panel) 1006 S101403 Screw Heat exchanger and burner 2001 S100893 Heat exchanger 28kW 2002 S100894 Condensate tank 253 mm 2003 S100703...
  • Page 120 9. Spare parts MCA 25/28 BIC Markers Code no. Description Part 3006 S101290 Gas inlet pipe 3007 S100911 Air intake silencer 3008 S56155 Sealing ring Ø 23,8x17,7x2 mm 3011 S100951 Screw M5x25 3012 S101010 G3/4" nut S101542 Propane diaphragm - 4.00 mm Control panel 4001 S101478...
  • Page 121 MCA 25/28 BIC 9. Spare parts Markers Code no. Description Part 5019 S100826 Screw K50x28 5020 S100836 Screw M5x15 5023 S100832 Clip 26 with handle 5025 S59141 Screw M5x18 5027 S101002 Condensate evacuation hose 5029 S100825 Screw K50x12 5030 S62727 Grommet Ø...
  • Page 122 9. Spare parts MCA 25/28 BIC 15/06/12 - 300022159-001-01...
  • Page 124 Зубарев переулок, д. 15/1 Бизнес-центр «Чайка Плаза», офис 309 +7 (495) 221-31-51 DUEDI S.r.l. DE DIETRICH THERMIQUE Iberia S.L.U. www.duediclima.it www.dedietrich-calefaccion.es Distributore Ufficiale Esclusivo Av. Princep d’Astúries 43-45 De Dietrich-Thermique Italia 08012 BARCELONA Via Passatore, 12 - 12010 +34 932 920 520...

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