DE DIETRICH MCA 25, MCA 28 BIC User Manual

Ireland

Innovens

Wall-hung gas condensing boilers

MCA 25/28 BIC

User Guide

300024163-001-B

Contents

1 Introduction ................................................................................................4

1.1 Symbols used .......................................................4

1.2 Abbreviations ........................................................4

1.3 General ..................................................................5

1.3.1 Manufacturer's liability .............................................5

1.3.2 Installer's liability .....................................................5

1.3.3 User's liability ..........................................................5

1.4 Certifications .........................................................6

2 Safety instructions and recommendations ..............................................7

2.1 Safety instructions ...............................................7

2.2 Recommendations ................................................8

3 Description ..................................................................................................9

3.1 Operating principle ...............................................9

3.1.1 Gas/air setting .........................................................9

3.1.2 Combustion .............................................................9

3.1.3 Heating and domestic hot water production ............9

3.2 Main parts ............................................................10

3.3 Control panel .......................................................11

3.3.1 Description of the keys ..........................................11

3.3.2 Description of the display ......................................12

3.3.3 Browsing in the menus ..........................................14

4 Operating the boiler .................................................................................16

4.1 Commissioning the boiler ..................................16

4.2 Reading out measured values ...........................16

4.3 Changing the settings ........................................18

4.3.1 Setting the set point temperatures ........................18

4.3.2 Selecting the operating mode ...............................19

4.3.3 Forcing domestic hot water production .................20

4.3.4 Setting the contrast and lighting on the

display ...................................................................20

4.3.5 Setting the time and date ......................................21

4.3.6 Selecting a timer programme ................................21

4.3.7 Customising a timer programme ...........................22

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Contents

4.4 Installation shutdown .........................................24

4.5 Frost protection ..................................................24

5 Checking and maintenance .....................................................................26

5.1 General instructions ...........................................26

5.2 Periodic checks ..................................................26

5.3 Filling the system ...............................................27

5.4 Bleeding the heating system .............................28

5.5 Draining the installation .....................................30

6 Troubleshooting .......................................................................................32

6.1 Anti-hunting ........................................................32

6.2 Messages (Code type Bxx or Mxx) ....................32

6.3 Faults (Code type Lxx or Dxx) ...........................34

7 Technical specifications ..........................................................................40

7.1 Technical specifications ....................................40

8 Energy savings .........................................................................................41

8.1 Energy-saving advice .........................................41

8.2 Recommendations ..............................................41

9 Warranty ....................................................................................................42

9.1 General ................................................................42

9.2 Warranty terms ...................................................42

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MCA 25/28 BIC

1 Introduction

1.1 Symbols used

1. Introduction

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.

WARNING

Risk of a dangerous situation causing slight physical injury.

1.2 Abbreviations

CAUTION

Risk of material damage.

Signals important information.

¼ Signals a referral to other instructions or other pages in the instructions.

4 3CE: Collective conduit for sealed boiler

4 DHW: Domestic hot water

4 Interscenario switch: Home automation switch that can be used

to centralise and control several scenarios

4 Hi: Lower heating value LHV (Nett)

4 Hs: Higher heating value HHV (Gross)

4 IOBL: Carrier current home automation bus

4 PPS: Polypropylene hardly inflammable

4 PCU: Primary Control Unit - PCB for managing burner operation

4 PSU: Parameter Storage Unit - Parameter storage for PCBs

PCU and SU

4 SCU: Secondary Control Unit - control panel PCB

4 SU: Safety Unit - Safety PCB

4 3WV: 3-way valve

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1. Introduction

1.3 General

MCA 25/28 BIC

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. All the specifications stated in this document are therefore subject to change without notice.

Our liability as the manufacturer may not be invoked in the following cases:

4 Failure to abide by the instructions on using the appliance.

4 Faulty or insufficient maintenance of the appliance.

4 Failure to abide by the instructions on installing the appliance.

1.3.2. Installer's liability

The installer is responsible for the installation and inital start up of the appliance. The installer must respect the following instructions:

4 Read and follow the instructions given in the manuals provided

with the appliance.

4 Carry out installation in compliance with the prevailing legislation

and standards.

4 Perform the initial start up and carry out any checks necessary.

4 Explain the installation to the user.

4 If a maintenance is necessary, warn the user of the obligation to

check the appliance and maintain it in good working order.

4 Give all the instruction manuals to the user.

1.3.3. User's liability

To guarantee optimum operation of the appliance, the user must respect the following instructions:

4 Read and follow the instructions given in the manuals provided

with the appliance.

4 Call on qualified professionals to carry out installation and initial

start up.

4 Get your fitter to explain your installation to you.

4 Have the required checks and services done.

4 Keep the instruction manuals in good condition close to the

appliance.

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MCA 25/28 BIC 1. Introduction

This appliance is not intended to be used by persons (including children) whose physcial, sensory or mental capacity is impaired or persons with no experience or knowledge, unless they have the benefit, through the intermediary of a person responsible for their safety, of supervision or prior instructions regarding use of the appliance. Care should be taken to ensure that children do not play with the appliance.

1.4 Certifications

CE identification no

NOx classification

Type of connection Chimney: B23 , B

PIN 0063BT3444

5 (EN 297 pr A3, EN 656)

Flue gas outlet: C13 , C33, C43, C53, C63, C83 , C

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2. Safety instructions and recommendations MCA 25/28 BIC

2 Safety instructions and

recommendations

2.1 Safety instructions

DANGER

If you smell gas:

1. Do not use a naked flame, do not smoke, do not operate electrical contacts or switches ( doorbell, light, motor, lift, etc..).

2. Shut off the gas supply.

3. Open the windows.

4. Evacuate the premises.

5. Call your fitter.

DANGER

If you smell flue gases:

1. Switch the appliance off.

2. Open the windows.

3. Evacuate the premises.

4. Call your fitter.

WARNING

Depending on the settings of the appliance:

4 The temperature of the flue gas conduits may exceed

60°C.

4 The temperature of the radiators may reach 85°C.

4 The temperature of the domestic hot water may reach

65°C.

CAUTION

Do not neglect to service the appliance: 4 For completely safe and optimum operation, you

must have your boiler regularly serviced by an approved installer.

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MCA 25/28 BIC 2. Safety instructions and recommendations

2.2 Recommendations

WARNING

Only qualified professionals are authorised to work on the appliance and the installation.

4 Regularly check the water pressure in the installation (minimum

pressure 0,8 bar, recommended pressure between 1,5 and 2,0 bar).

4 Keep the appliance accessible at all times.

4 Never remove or cover labels and rating plates affixed to the

appliance. Labels and rating plates must be legible throughout the entire lifetime of the appliance.

4 The appliance should be on Summer or Antrifreeze mode rather

than switched off to guarantee the following functions:

- Anti blocking of pumps

- Frost protection

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3. Description

3 Description

3.1 Operating principle

MCA 25/28 BIC

3.1.1. Gas/air setting

The casing fitted to the boiler is also used as an air box. Air is sucked in by the fan and gas injected into the venturi by the fan intake. The fan rotation speed is set according to the settings parameters, the thermal energy requirement and the temperatures measured by the temperature sensors. The gas and air are mixed in the venturi. The gas/air ratio ensures that the quantities of gas and air are adjusted to each other. This provides optimum combustion on the entire output range. The gas/air mixture is fed into the burner on top of the exchanger.

3.1.2. Combustion

The burner heats the heating water circulating in the heat exchanger. At a return temperature lower than around 55°C, the flue gases cool down to a temperature lower than the dew point, thus causing the condensation of the water vapour contained in the flue gases in the back side of the heat exchanger. The heat released during this condensation process (the latent heat or condensing heat) is also transferred to the heating water. The cooled combustion gases are evacuated via the combustion gas outlet flue. The condensation water is evacuated via a siphon.

3.1.3. Heating and domestic hot water production

An integrated plate exchanger handles domestic hot water production. A 3-way valve determines whether the heated water is fed into the heating system or the plate exchanger. A DHW sensor signals domestic hot water demands. This signal is transmitted to the control panel, which then switches the 3-way valve to the hot water position and trips the heating pump. The 3-way valve is spring-loaded but only consumes electricity when it switches to another position.

The heating water reheats the domestic water in the plate exchanger. This water is pumped into the boiler tank to provide a constant plentiful supply of domestic hot water. In comfort mode, if no domestic hot water is drawn off, the boiler reheats the plate exchanger and the boiler tank at regular intervals. Any limescale particles are kept out of the plate exchanger by a self-cleaning water filter (selfcleans once every 76 hours).

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T001961-D

14 13

MCA 25/28 BIC 3. Description

3.2 Main parts

Flue gas discharge pipe

Casing/air box

Flue gas measuring point

Mixer pipe

Heating flow hose

Air intake silencer

Box for the control PCBs

Combined venturi and gas valve unit

Flow end hydrobloc

Safety valve outlet pipe

Siphon

Control panel

Tank drainage valve

Expansion vessel (DHW circuit)

Tank hydrobloc

Shunt pump (DHW circuit)

Shunt pump (Heating circuit)

Return end hydrobloc

Plate heat exchanger (DHW circuit)

3-way valve

Condensate receiver tank

Fan

Heat exchanger (Heating circuit)

Calorifier tank

Ignition/ionization electrode

Expansion vessel (Heating circuit)

Air intake

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A000866-A

bar

STD

0 2 4 6 8 10 12 14 16 18 22 2420

AUTO

(

3. Description MCA 25/28 BIC

3.3 Control panel

3.3.1. Description of the keys

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:

4 Turn the rotary button to scroll through the menus or

modify a value

4 Press the rotary button to access the menu selected

or confirm a value modification

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C002705-A

C002704-A

C002703-A

C002702-A

bar

STD

(

0 2 4 6 8 10 12 14 16 18 22 2420

C002696-A

AUTO

bar

STD

0 2 4 6 8 10 12 14 16 18 22 2420

C002701-B

AUTO

MCA 25/28 BIC 3. Description

3.3.2. Description of the display

Key functions

> ( '

STD

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

Reset of the time programmes

Selection of comfort mode or selection of the days to be programmed

Selection of reduced mode or deselection of the days to be programmed

ESC

Back to the previous level

Back to the previous level without saving the modifications made

Flame output level

Manual reset

The whole symbol flashes: The burner starts up but the flame is not yet present

Part of the symbol flashes: Output is increasing

Steady symbol: The required output has been reached

Part of the symbol flashes: Output is dropping

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bar

STD

0 2 4 6 8 10 12 14 16 18 22 2420

C002697-B

AUTO

bar

STD

0 2 4 6 8 10 12 14 16 18 22 2420

C002698-B

AUTO

bar

STD

0 2 4 6 8 10 12 14 16 18 22 2420

C002708-A

AUTO

3. Description MCA 25/28 BIC

Operating modes

AUTO

Summer mode: The heating is off. Domestic hot water continues to be produced

WINTER mode: Heating and domestic hot water working

Operation in automatic mode according to the timer programme

Comfort mode: The symbol is displayed when a DAY override (comfort) is activated

4 Flashing symbol: Temporary override

4 Steady symbol: Permanent override

Reduced mode: The symbol is displayed when a NIGHT override (reduced) is activated

4 Flashing symbol: Temporary override

4 Steady symbol: Permanent override

Holiday mode: The symbol is displayed when a HOLIDAY override (antifreeze) is activated

4 Flashing symbol: Holiday mode programmed

4 Steady symbol: Holiday mode active

System pressure

bar

Manual mode

Pressure indicator: The symbol is displayed when a water pressure sensor is connected.

4 Flashing symbol: The quantity of water is insufficient.

4 Steady symbol: The quantity of water is sufficient.

Water pressure level

4 R : 0,9 to 1,1 bar 4 E : 1,2 to 1,5 bar 4 Z : 1,6 to 1,9 bar 4 A : 2,0 to 2,3 bar 4 l : > 2,4 bar

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