DeDietrich Innovens MCA 15 Installation And Service Manual
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DeDietrich Innovens MCA 15 Installation And Service Manual

Wall-hung gas condensing boilers
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Innovens
Wall-hung gas condensing boilers
MCA 15 - MCA 25
MCA 25/28 MI
300022146-001-B
Installation and
Service Manual
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Summary of Contents for DeDietrich Innovens MCA 15

  • Page 1 Innovens Wall-hung gas condensing boilers MCA 15 - MCA 25 MCA 25/28 MI Installation and Service Manual 300022146-001-B...

  • Page 2: Declaration Of Conformity

    MCA 15 - MCA 25 MCA 25/28 MI Declaration of conformity The appliance complies with the standard model described in declaration of compliance [. It is manufactured and distributed pursuant to the requirements of european directives. The original of the declaration of compliance is available from the manufacturer.

  • Page 3: Table Of Contents

    Contents Introduction ....................6 Used symbols ............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 Gas 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 MCA 15 - MCA 25 MCA 25/28 MI Contents Installing the mounting frame ......20 Positioning the boiler .........21 Hydraulic connections ........22 4.6.1 Flushing the system ..........22 4.6.2 Connection of the heating circuit ......22 4.6.3 Hydraulic connection of the water circuit for domestic use ................23 4.6.4 Connecting the expansion vessel ......23...
  • Page 5 5.2.2 Gas circuit .............64 5.2.3 Hydraulic circuit .............64 5.2.4 Electrical connections ...........64 Putting the appliance into operation ....65 Gas settings ............66 5.4.1 Adapting to another gas type ........66 5.4.2 Setting the air/gas ratio (Full load) ......67 5.4.3 Setting the air/gas ratio (Part load) ......69 5.4.4 Basic setting for the gas/air ratio ......71 Checks and adjustments after...
  • Page 6 MCA 15 - MCA 25 MCA 25/28 MI Contents 7.4.8 Checking the safety valve ........104 7.4.9 Checking the siphon ..........104 7.4.10 Checking the burner and cleaning the heat exchanger ............105 Specific maintenance operations ....106 7.5.1 Replacing the ionisation/ignition electrode ..106 7.5.2 Cleaning the plate exchanger (domestic hot water end) and the water filter cartridge .......106...
  • Page 7 29/04/2010 - 300022146-001-B...

  • Page 8: Introduction

    1. Introduction MCA 15 - MCA 25 MCA 25/28 MI Introduction Used symbols 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.

  • Page 9: General

    MCA 15 - MCA 25 MCA 25/28 MI 1. Introduction General 1.3.1. Manufacturer's liability Our products are manufactured in compliance with the requirements of the various european applicable 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: Gas Categories

    1. Introduction MCA 15 - MCA 25 MCA 25/28 MI 1.4.2. Gas 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 15 - MCA 25 MCA 25/28 MI 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..).
  • Page 12 2. Safety instructions and recommendations MCA 15 - MCA 25 MCA 25/28 MI 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 boiler.

  • Page 13: Technical Description

    MCA 15 - MCA 25 MCA 25/28 MI 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 15 - MCA 25 MCA 25/28 MI Expansion vessel Ignition/ionization electrode Air intake Operating principle 3.3.1. Skeleton Diagrams Heat exchanger (Heating circuit) Hydrobloc Plate heat exchanger (DHW circuit) (Only on models with domestic hot water production) Heating flow Domestic hot water outlet Domestic cold water inlet...

  • Page 15: Water Flow Rate

    MCA 15 - MCA 25 MCA 25/28 MI 3. Technical description 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 15 - MCA 25 MCA 25/28 MI Boiler type MCA 15 MCA 25 MCA 25/28 MI Maximum counter pressure Characteristics of the heating circuit Water content Water operating pressure minimum kPa (bar) 80 (0,8) 80 (0,8) 80 (0,8) Water operating pressure (PMS) maximum...
  • Page 17 MCA 15 - MCA 25 MCA 25/28 MI 3. Technical description Outside sensor Outlet sensor circuit B+C Boiler sensor Domestic hot water sensor Return sensor 1266 ¨ 90 °C 100 °C 952 ¨ 110 °C 726 ¨ 29/04/2010 - 300022146-001-B...

  • Page 18: Installation

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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...

  • Page 19: Choice Of The Location

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation Boiler options Control system options Description package Description package DHW tank SR130 EE22 Room sensor FM52 Kit for connection between MCA and SR130 EA137 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.

  • Page 20: Location Of The Appliance

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 4.3.2. Location of the appliance 4 Before mounting the boiler, decide on the ideal position for mounting, bearing the Directives and the dimensions of the appliance in mind. 4 When choosing the position for mounting the boiler, bear in mind the authorised position of the combustion gas discharge outlets and the air intake opening.

  • Page 21: Main Dimensions

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 4.3.4. Main dimensions 257,5 T001116-B 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...

  • Page 22: Installing The Mounting Frame

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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.

  • Page 23: Positioning The Boiler

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation Positioning the boiler 1. Remove the protective caps from all of the hydraulic inlets and outlets on the boiler. T001870-A 2. Fit a fibre gasket to each joint on the valve plate. T001627-A 3.

  • Page 24: Hydraulic Connections

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI Hydraulic connections 4.6.1. Flushing the system Installation must be carried out in accordance with the prevailing regulations, the codes of practice and the recommendations in these instructions. n Installing the boiler in new installations (installations less than 6 months old) 4 Clean the installation with a universal cleaner to eliminate debris from the appliance (copper, flaxen thread, flux).

  • Page 25: Hydraulic Connection Of The Water Circuit For Domestic Use

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation The boiler is factory fitted with a safety valve mounted on the left hydrobloc. CAUTION The heating pipe must be mounted in accordance with prevailing provisions. T001633-B 4.6.3. Hydraulic connection of the water circuit for domestic use 1.

  • Page 26: Connecting The Condensate Discharge Pipe

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI Initial pressure of the Volume of the opened expansion vessel depending on the volume of the installation (in litres) expansion vessel > 300 0.5 bar 12,0 14,4 Volume of the installation x 0,048 1 bar 10,0 14,0...

  • Page 27: Gas Connection

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation Gas connection The diameters of the pipes must be defined in accordance with the standards in force in your country. Connection by internal brazing ∅ 18 mm 1. Connect the gas inlet pipe. T001621-A WARNING Close the main gas valve before starting work on the...

  • Page 28: Flue Gas System Connections

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI Flue gas system connections 4.8.1. Classification Lmax Lmax = L Lmax C 43 C 33 Lmax Lmax Lmax Lmax C 43 C 33 C 13 Lmax Lmax = B 23 C 93 C 33 C 93...

  • Page 29: Lengths Of The Air/Flue Gas Pipes

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation Configuration C 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 Only factory components are authorised for connecting the boiler and the terminal.

  • Page 30: Installing The Outside Sensor

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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...

  • Page 31: 4.10 Electrical Connections

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation CB wood screws diameter 4 + dowels 8800N003-B 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. All other external connections can be made to the connection connectors (low voltage).

  • Page 32: Recommendations

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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 33: Position Of The Pcbs

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 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...

  • Page 34: Accessing The Connection Terminal Blocks

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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.
  • Page 35 MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 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 29/04/2010 - 300022146-001-B...

  • Page 36: Connecting A Direct Heating Circuit

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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...

  • Page 37: Connecting A Direct Heating Circuit And A Domestic Hot Water Tank

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 4.10.6. Connecting a direct heating circuit and a domestic hot water tank 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...
  • Page 38 4. Installation MCA 15 - MCA 25 MCA 25/28 MI Connect the DHW tank anode. CAUTION If the tank is fitted with a Titan Active System® impressed current anode, connect the anode to the inlet (+ on the anode, - on the tank). If the tank is not fitted with an impressed current anode, put the simulation connector in place (delivered with the DHW...

  • Page 39: Connecting Two Circuits And A Domestic Hot Water Tank Before The Mixing Tank

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 4.10.7. Connecting two circuits and a domestic hot water tank before the mixing tank 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...
  • Page 40 4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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.

  • Page 41: Connecting Two Circuits And A Domestic Hot Water Tank After The Mixing Tank

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 4.10.8. Connecting two circuits and a domestic hot water tank after the mixing tank 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...
  • Page 42 4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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.

  • Page 43: Hot Water Storage Tank Connection

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 4.10.9. Hot water storage tank connection n QUADRO DU 750 storage tank In this installation example, the storage tank (type QUADRO DU 750) incorporates a domestic hot water zone. The boiler starts up systematically to maintain the domestic hot water zone in the storage tank or to maintain the independent tank at temperature.
  • Page 44 4. Installation MCA 15 - MCA 25 MCA 25/28 MI Buffer tank. Solar sensor probe. Connect the solar station to the solar collectors. Do not connect anything to the terminal block. Settings to be made for this type of installation Parameters Access Settings to be made See chapter...
  • Page 45 MCA 15 - MCA 25 MCA 25/28 MI 4. Installation n PS storage tank and DHW tank connected to the boiler The boiler only starts up if the storage tank is not hot enough to guarantee loading of the DHW tank. On/off 0-10V S AMB C...
  • Page 46 4. Installation MCA 15 - MCA 25 MCA 25/28 MI 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). Do not connect anything to the terminal block.
  • Page 47 MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 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 C002369-F Do not connect anything to the terminal block.

  • Page 48: Pool Connection

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI Settings to be made for this type of installation Parameters Access Settings to be made See chapter ¼ "Displaying the parameters in extended mode", page INSTALLATION "Installer" level EXTENDED #SYSTEM menu ¼...
  • Page 49 MCA 15 - MCA 25 MCA 25/28 MI 4. Installation Pool heating cut-off control When the parameter I.TEL: is on 0/1 B, the swimming pool is no longer heated when the contact is open (factory setting), only the antifreeze continues to be active. The contact direction can still be adjusted by the parameter CT.TEL.

  • Page 50: Connecting A Mixed Tank

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI n Hourly programming of the secondary circuit pump The secondary pump operates during programme B comfort periods in summer and winter alike. n Stopping To prepare your pool for winter, consult your pool specialist. 4.10.11.

  • Page 51: Connecting The Options

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 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). Connect the DHW sensor (Package AD212).

  • Page 52: Connection In Cascade

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI Do not connect anything to the terminal block. Connect the load pump to the second tank. Second domestic hot water tank Connect the DHW sensor from the second tank. Alarm indicator Connect the TELCOM remote vocal monitoring module (depending on its availability in your country).
  • Page 53 MCA 15 - MCA 25 MCA 25/28 MI 4. Installation Secondary boiler D.H.W. load pump Connect the DHW sensor (Package AD212) Cable BUS Low loss header Cascade outlet sensor Connect the sensor to the terminal block S SYST on the master boiler.
  • Page 54 4. Installation MCA 15 - MCA 25 MCA 25/28 MI n DHW tank on master boiler C002591-B Connect the DHW sensor (Package AD212) Master boiler Secondary boiler Secondary boiler Low loss header Cascade outlet sensor Connect the sensor to the terminal block S SYST on the master boiler.

  • Page 55: 4.11 Electrical Diagram

    MCA 15 - MCA 25 MCA 25/28 MI 4. Installation 4.11 Electrical diagram 3 2 1 2 3 4 1 1 2 3 1 2 3 2 3 4 5 1 2 3 GN/YW 1 3 2 3 1 2 1 2 4 5 SCU-C X121...

  • Page 56: 4.12 Filling The System

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 4.12 Filling the system 4.12.1. Water treatment Treat the water in the installation to limit corrosion, calcium and limescale deposits, sludge, microbiological contamination, etc.. CAUTION An uncleaned installation or an installation using water of unsuitable quality may bring about the cancellation of the warranty.
  • Page 57 MCA 15 - MCA 25 MCA 25/28 MI 4. Installation Manufacturer Product Function GE-Water / Betzdearborn Sentinel X100 protective product Sentinel X200 Limescale remover Sentinel X300 protective product for new installations Sentinel X400 protective product for existing installations Sentinel X500 Antifreeze and inhibitor Other manufacturers propose similar products.

  • Page 58: Filling The System

    4. Installation MCA 15 - MCA 25 MCA 25/28 MI 4.12.2. Filling the system CAUTION Before filling, open the valves on every radiator in the installation. T000181-B 1. Open the cold water inlet and heating outlet valves. T001620-A 2. Open the disconnector valves (During filling, air can escape from the system via the automatic air vent).

  • Page 59: Start-Up

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up Start-up 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:...

  • Page 60: Description Of The Display

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 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 61: Operating Modes

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n Operating modes Summer mode: The heating is off. Domestic hot water continues to be produced WINTER mode: Heating and domestic hot water working < AUTO Operation in automatic mode according to the timer AUTO programme Comfort mode: The symbol is displayed when a DAY...

  • Page 62: Access To The Various Browsing Levels

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI n Domestic Hot Water override A bar is displayed when a DHW override is activated: Flashing bar: Temporary override Steady bar: Permanent override < AUTO n Other information The symbol is displayed when domestic hot water production is running Valve indicator: The symbol is displayed when a 3-way valve is connected...
  • Page 63 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n "Installer" level The information and settings in the "Installer" level can be accessed by experienced people. 1. Press key - for around 5 seconds. Before the "Installer" level is displayed, the EMISSION SUNDAY 11:45 MEASUREMENTS menu will be displayed.

  • Page 64: Browsing In The Menus

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 5.1.4. Browsing in the menus 1. To select the desired menu, turn the rotary button. 2. To access the menu, press the rotary button. #MEASURES To go back to the previous display, press the key j. #CHOICE TIME PROG.

  • Page 65: Check Points Before Commissioning

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up Check points before commissioning 5.2.1. Preparing the boiler for commissioning WARNING Do not put the boiler into operation if the supplied gas is not in accordance with the approved gas types. Preparatory procedure for boiler commissioning: 4 Check that the gas type supplied matches the data shown on the boiler's data plate.

  • Page 66: Gas Circuit

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 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.

  • Page 67: Putting The Appliance Into Operation

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up Putting the appliance into operation 1. Tilt the control box upwards again and fasten it using the clips located at the sides. 2. Open the main gas supply. 3. Open the gas valve on the boiler. 4.

  • Page 68: Gas Settings

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI Gas settings 5.4.1. Adapting to another gas type WARNING Only a qualified engineer may carry out the following operations. The boiler is preset in the factory to operate on natural gas H (G20). For operation on another group of gases, carry out the following operations: 4 Set the air/gas ratio.

  • Page 69: Setting The Air/Gas Ratio (Full Load)

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up 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 70 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 7. If this rate does not match the required value, correct the gas/air ratio using the adjustment screw A on the gas valve unit. 8. Check the flame through the flame viewport. The flame must not be detached.

  • Page 71: Setting The Air/Gas Ratio (Part Load)

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up 5.4.3. Setting the air/gas ratio (Part 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 72 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 7. 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.

  • Page 73: Basic Setting For The Gas/Air Ratio

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up 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 74: Setting The Parameters Specific To The Installation

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI "Installer" level - #SYSTEM menu Parameter Adjustment range Description Factory setting Customer setting Displays the parameters of a conventional INSTALLATION CLASSIC CLASSIC installation Displays all parameters EXTENDED Regardless of what is done to the keys, the regulator switches back to CLASSIC mode after 30 minutes.
  • Page 75 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up "Installer" level - #SYSTEM menu Parameter Adjustment range Description Factory setting Customer setting Heating pump circuit A: The PUMP A outlet is used to CH.PUMP A CH.PUMP A O.PUMP A control the pump on circuit A Used to resume the functions of the S.AUX parameter CIRC.AUX...
  • Page 76 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI "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...

  • Page 77: Naming The Circuits And Generators

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up 5.5.3. Naming the circuits and generators 1. Access the "installer" level: Press key - for around 5 seconds. 2. Select the menu #NAMES OF THE CIRCUITS. SUNDAY 11:45 Turn the rotary button to scroll through the menus or TEMP.: 68°...

  • Page 78: Setting The Heating Curve

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 5.5.4. Setting the heating curve If an outside temperature sensor is connected, it is possible to adapt the heating curve. 1. Access the "installer" level: Press key - for around 5 seconds. 2.
  • Page 79 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n Heating curve without BCT The BCT (Base heat Curve Temperature) 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 80: Finalizing Work

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 5.5.5. Finalizing work 1. Remove the measuring equipment. 2. Put the flue gas sampling plug back in place. 3. Refit the front panel. Tighten the two screws by a quarter turn. 4.

  • Page 81: Changing The Settings

    MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up "User" level - #MEASURES menu Parameter Description Unit Water temperature in the boiler °C BOILER TEMP. Water pressure in the installation PRESSURE Water temperature in the DHW tank °C WATER TEMP. Water temperature in the storage tank °C STOR.TANK.TEMP...

  • Page 82: Language Selection

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 5.7.1. Language selection 1. Access the "installer" level: Press key - for around 5 seconds. 2. Select the menu #LANGUAGE. SUNDAY 11:45 Turn the rotary button to scroll through the menus or TEMP.: 68°...
  • Page 83 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up "User" level - #SETTING menu Parameter Adjustment Description Factory setting Customer range 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.

  • Page 84: Professional" Settings

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 5.7.3. "Professional" settings 1. Access the "installer" level: Press key - for around 5 seconds. 2. To set the following parameters: SUNDAY 11:45 Turn the rotary button to scroll through the menus or TEMP.: 68°...
  • Page 85 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up "Installer" level - #SECONDARY LIMITS menu Parameter Adjustment range Description Factory setting 20 to 95 °C Maximum temperature (Circuit A) 75 °C MAX.CIRC.A See comments below 20 to 95 °C Maximum temperature (Circuit B) 50 °C MAX.CIRC.B...
  • Page 86 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI "Installer" level - #SECONDARY INSTAL.P menu Parameter Adjustment range Description Factory Customer setting setting 0 (10 hours) to 10 Characterisation of building's inertia: 3 (22 hours) (1)(3) BUILD. INERTIA (50 hours) 0 for a building with low thermal inertia.
  • Page 87 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up "Installer" level - #SECONDARY INSTAL.P menu Parameter Adjustment range Description Factory Customer setting setting 0 to 15 minutes Timing of the shutdown of the domestic hot 2 minutes HW. PUMP DELAY water pump.
  • Page 88 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI n SCREED DRYING Used to force a constant flow temperature or a train to accelerate screed drying on underfloor heating. The setting for these temperatures must follow the screed-layer's recommendations. Activation of this parameter (setting other than OFF) forces the permanent display of SCREED DRYING and deactivates all other control system functions.
  • Page 89 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n NIGHT This parameter is displayed if at least one circuit does not include a room sensor. For circuits without a room sensor: 4 NIGHT :DEC. (Reduced): The reduced temperature is maintained during reduced periods.

  • Page 90: Configuring The Network

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 5.7.4. Configuring the network 1. Access the "installer" level: Press key - for around 5 seconds. 2. Select the menu #NETWORK. SUNDAY 11:45 Turn the rotary button to scroll through the menus or TEMP.: 68°...
  • Page 91 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n Connecting appliances in cascade It is possible, in a cascade configuration, to enlist generators and/or VMs as slaves. Proceed as follows: 1. Set CASCADE to YES by pressing the rotary button and then turning and pressing it again to confirm.
  • Page 92 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 7. Select NUMB.ELEMENTS.NETWORK. This screen summarises the elements in the network recognised by the system. Press j to go back to the previous list. NB.NETWORK ELEMENTS GENE: 2, 5, VM: 29, <...
  • Page 93 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n Configuring the scenarios It is possible to choose a scenario and allocate it to various IOBL units via the carrier current. Proceed as follows: 1. In the menu #NETWORK, select InOne SCENARIO. INTER STAGE TIMER 3WW PLC InOne SCENARIO...
  • Page 94 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI n Removing a device To remove a device, proceed as follows: 1. In the menu #NETWORK, select REMOVE DEVICE. INTER STAGE TIMER 3WW PLC InOne SCENARIO REMOVE DEVICE < AUTO C002419-B-04 2.
  • Page 95 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n Controlling the boiler from an IOBL Scenario Switch It is possible to control the boiler from a scenario switch (the boiler is then considered a slave boiler). Proceed as follows: 1.
  • Page 96 5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 3. Set the display to YES by turning the rotary button and pressing to confirm. LEARN ? "An external devicetries to connect, do you want to authorize it?" < AUTO C002423-A-04 4.
  • Page 97 MCA 15 - MCA 25 MCA 25/28 MI 5. Start-up n Erasing a scenario from the IOBL Scenario Switch It is possible to remove a scenario using the IOBL scenario switch. Proceed as follows: 1. Press the LEARN key on the scenario switch, then the control key that pilots the scenario to be erased.

  • Page 98: Returning To The Factory Settings

    5. Start-up MCA 15 - MCA 25 MCA 25/28 MI 5.7.5. Returning to the factory settings To reset the appliance, proceed as follows: 1. Press key C, > and j simultaneously for 4 seconds. The menu 4" #RESET is displayed. SUNDAY 11:45 MODE <...

  • Page 99: Switching Off The Appliance

    MCA 15 - MCA 25 MCA 25/28 MI 6. Switching off the appliance Switching off the appliance Installation shutdown CAUTION Do not switch off the boiler. If the central heating system is not used for a long period, we recommend activating the HOLIDAYS mode.

  • Page 100: Checking And Maintenance

    7. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI 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 101: Customising Maintenance

    MCA 15 - MCA 25 MCA 25/28 MI 7. Checking and maintenance EMISSION MEASUREMENTS menu Generator Function available Description Values displayed Generator name OFF normal operation °C BOILER TEMP. µA CURRENT WIND SPEED °C BACK TEMP Operating at minimum output °C PMIN BOILER TEMP.

  • Page 102: Installer's Contact Details

    7. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI n Clearing the maintenance message After carrying out the maintenance operations, modify the date in the #NETWORK menu to clear the message. n 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 #NETWORK menu.

  • Page 103: Checking The Hydraulic Pressure

    MCA 15 - MCA 25 MCA 25/28 MI 7. Checking and maintenance 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 104: Checking Combustion

    7. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI 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 105: Checking The Automatic Air Vent

    MCA 15 - MCA 25 MCA 25/28 MI 7. Checking and maintenance 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. 4.

  • Page 106: Checking The Safety Valve

    7. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI 7.4.8. Checking the safety valve 1. Take out the flow collector located under the boiler. 2. Check whether there is any water in the end of the flow pipe on the safety valve.

  • Page 107: Checking The Burner And Cleaning The Heat Exchanger

    MCA 15 - MCA 25 MCA 25/28 MI 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.

  • Page 108: Specific Maintenance Operations

    7. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI 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.
  • Page 109 MCA 15 - MCA 25 MCA 25/28 MI 7. Checking and maintenance n Cleaning the plate exchanger If descaling of the plate exchanger is necessary, proceed as follows: 1. Close the main water valve. 2. Drain the boiler. 3. Remove the air vent hose above the siphon. 4.
  • Page 110 7. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI n Cleaning the domestic water cartridge If cleaning or replacement of the water filter cartridge is necessary, proceed as follows: 1. Close the main water valve. 2. Drain the boiler. 3.

  • Page 111: Replacing The 3-Way Valve

    MCA 15 - MCA 25 MCA 25/28 MI 7. Checking and maintenance 7.5.3. 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 112: Replacing The Non-Return Valve

    7. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI 7.5.4. 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 113: Assembling The Boiler

    MCA 15 - MCA 25 MCA 25/28 MI 7. Checking and maintenance 7.5.5. 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.

  • Page 114: Troubleshooting

    8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI Troubleshooting Messages (Code type Bxx or Mxx) In the event of failure, the control panel displays a message and a corresponding code. 1. Make a note of the code displayed. The code is important for the correct and rapid diagnosis of the type of failure and for any technical assistance that may be needed.
  • Page 115 MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting Messages Code Description Checking / solution The BL inlet on the PCU PCB The contact connected to the BL inlet is open BL INPUT OPEN terminal block is open Check the contact on the BL inlet Parameter error Check the parameter IN.BL Bad connection...

  • Page 116: Message History

    8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI Messages Code Description Checking / solution Floor drying is active Floor drying is underway. Heating on the circuits not concerned is FL.DRY.B XX shut down. DAYS XX DAYS = Number of days' floor drying remaining.

  • Page 117: Faults (Code Type Lxx Or Dxx)

    MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting Faults (Code type Lxx or Dxx) In the event of operational failure, the control panel flashes and displays an error message and a corresponding code. 1. Make a note of the code displayed. The code is important for the correct and rapid diagnosis of the type of failure and for any technical assistance that may be SUNDAY 11:45...
  • Page 118 8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI Faults Code Cause Description Checking / solution of the error The boiler flow sensor is on an Bad connection DEF.OUTLET S. open circuit 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...
  • Page 119 MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting Faults Code Cause Description Checking / solution of the error The return temperature sensor Bad connection BACK S.FAILURE is on an open circuit 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...
  • Page 120 8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI Faults Code Cause Description Checking / solution of the error Difference between the flow Sensor fault DEP-RET>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...
  • Page 121 MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting Faults Code Cause Description Checking / solution of the error Detection of a parasite flame Ionisation current present when there should not be a PARASIT FLAME flame Ignition transformer defective Check the ionisation/ignition electrode Gas valve defective Check the gas valve and replace if necessary...
  • Page 122 8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI Faults Code Cause Description Checking / solution of the error 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 123 MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting Faults Code Cause Description Checking / solution of the error Auxiliary sensor failure Bad connection AUX.SENS.FAIL. ¼ Check whether the sensor is connected: See chapter: "Deletion of sensors from the memory in the PCB", page 123 Check the link and the connectors Check that the sensor has been correctly fitted...
  • Page 124 8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI Faults Code Cause Description Checking / solution of the error Swimming pool sensor failure Bad connection SWIM.P.B. S.FAIL circuit B SWIM.P.C. S.FAIL ¼ Check whether the sensor is connected: Swimming pool sensor failure See chapter: "Deletion of sensors from the circuit C memory in the PCB", page 123...

  • Page 125: Deletion Of Sensors From The Memory In The Pcb

    MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting Faults Code Cause Description Checking / solution of the error 5 resets done in less than an hour 5 RESET:ON/OFF Switch the boiler off and switch back on The Titan Active System® is short-circuited TA-S SHORT-CIR Check that the connection cable between the SCU PCB and the anode is not short- circuited...

  • Page 126: Failure History

    8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI You have the option of removing a IOBL 3WV module from the memory in the SCU PCB: Go to the menu #NETWORK and select REMOVE DEVICE. Failure history The menu #DEFAULT HISTORIC is used to consult the last 10 errors displayed by the control panel.

  • Page 127: Parameter And Input/Output Check (Mode Tests)

    MCA 15 - MCA 25 MCA 25/28 MI 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 key - down until #PARAMETERS is displayed. 2.
  • Page 128 8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI "After Sales" level - #PARAMETERS menu Parameter Description Temperature of the system flow water if multi-generator (1)(2) SYSTEM TEMP. Water temperature in the bottom of the DHW tank (1)(2) T.DHW BOTTOM (1)(2) Water temperature in the second DHW tank connected to circuit A DHW A TEMP.
  • Page 129 MCA 15 - MCA 25 MCA 25/28 MI 8. Troubleshooting "After Sales" level - #TEST INPUTS menu Parameter Status OK Description Presence of a remote control A R.CTRL A No remote control A Presence of a remote control B R.CTRL B No remote control B Presence of a remote control C R.CTRL C...
  • Page 130 8. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI Control system sequence Status OK Sub-status Operation 3 / 4 Burner lit and free modulation on the boiler instruction Burner lit and free modulation on a limited instruction, equal to a return temperature of +30°C Burner lit and free modulation on the boiler set point but restricted on the control panel ¼...

  • Page 131: Spare Parts

    MCA 15 - MCA 25 MCA 25/28 MI 9. Spare parts Spare parts General When it is observed subsequent to inspection or maintenance work that a component in the boiler 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 132: Casing

    9. Spare parts MCA 15 - MCA 25 MCA 25/28 MI 9.2.1. Casing 1001 1006 1002 T001332-B EV 117641-1 29/04/2010 - 300022146-001-B...

  • Page 133: Heat Exchanger And Burner

    MCA 15 - MCA 25 MCA 25/28 MI 9. Spare parts 9.2.2. Heat exchanger and burner 2026 2028 2025 2029 2019 2018 2016 2013 2012 2014 2015 2017 2024 2011 2034 2050 2015 2033 2001 2022 2021 2023 2011 2005 2034 2020 2006...

  • Page 134: Fan

    9. Spare parts MCA 15 - MCA 25 MCA 25/28 MI 9.2.3. 3005 3003 3004 3007 3002 3011 3012 3008 3001 3008 3006 3010 T001334-B EV 117641-3 29/04/2010 - 300022146-001-B...

  • Page 135: Control Panel

    MCA 15 - MCA 25 MCA 25/28 MI 9. Spare parts 9.2.4. Control panel 4022 4019 4022 4021 4018 4023 4030 4017 4024 4008 4016 4027 4015 4007 4008 4028 4006 4009 4005 4002 4011 4001 4010 4014 4004 4012 4025 4003 4026...

  • Page 136: Connecting Pipes (Mca 15 - Mca 25)

    9. Spare parts MCA 15 - MCA 25 MCA 25/28 MI 9.2.5. Connecting pipes (MCA 15 - MCA 25) 5046 5041 5038 5044 5043 5037 5050 5049 5038 5048 5047 5042 5045 5039 5045 5056 5055 5012 5013 5013 5012 5033 5017 5017...

  • Page 137: Connecting Pipes (Mca 25/28 Mi)

    MCA 15 - MCA 25 MCA 25/28 MI 9. Spare parts 9.2.6. Connecting pipes (MCA 25/28 MI) 5046 5041 5039 5038 5044 5043 5037 5050 5049 5038 5048 5040 5045 5042 5047 5056 5055 5012 5013 5013 5012 5018 5006 5017 5055 5010...

  • Page 138: Spare Parts List

    9. Spare parts MCA 15 - MCA 25 MCA 25/28 MI 9.2.7. Spare parts list Markers Code no. Description Part Casing 1001 S100938 Front panel 1002 S100940 Control panel flap 1006 S101403 Screw Heat exchanger and burner 2001 S100893 Heating body - 28 kW 2002 S100894 Condensates collector - 253 mm...
  • Page 139 MCA 15 - MCA 25 MCA 25/28 MI 9. Spare parts Markers Code no. Description Part 3003 S100879 Burner 198 mm - 28 kW 3004 S100881 Gasket 83 mm with 28 kW valve 3005 S100882 Gas/air mixer 220x84 mm 3006 S100910 Gas inlet pipe 3007...
  • Page 140 9. Spare parts MCA 15 - MCA 25 MCA 25/28 MI Markers Code no. Description Part 5015 S100835 Clip - 16 mm 5016 S100810 25,2x17 O-ring 5017 S100813 Clip 26 5018 S100816 22,2x2,5 O-ring 5019 S100826 Screw K50x28 (MCA 15 - MCA 25) 5022 S100814 Clip 10,3...
  • Page 141 MCA 15 - MCA 25 MCA 25/28 MI 9. Spare parts 29/04/2010 - 300022146-001-B...
  • Page 142 9. Spare parts MCA 15 - MCA 25 MCA 25/28 MI 29/04/2010 - 300022146-001-B...
  • Page 144 T000249-B © Copyright All technical and technological information contained in these technical instructions, as well as any drawings and technical descriptions supplied, remain our property and shall not be multiplied without our prior consent in writing. 29/04/2010 DE DIETRICH THERMIQUE 57, rue de la Gare F- 67580 MERTZWILLER - BP 30...

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