MCR 24, 24/28MI, 30/35MI, 34/39MI

Wall-hung gas condensation boilers

Instructions for use

English08/06/06

Contents

Symbols used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 Parameter display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62 Setting different parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73 Setting the manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84 Modifying the water outlet temperature in the heating installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95 Switching off the central heating (In summer mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96 Setting the domestic water temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107 Modifying the comfort setting (ECO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Maintenance and periodic checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

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Congratulations on choosing a DE DIETRICH product, a product of quality. We strongly recommend that you read the following instructions inorder to guarantee the optimal operation of your appliance. We are sure that you will not be disappointed and that it will satisfy all of yourexpectations.

Symbols used

Caution dangerRisk of injury and damage to equipment. Attention must bepaid to the warnings on safety of persons and equipment

Important informationInformation must be kept in mind to maintain comfort

ReferenceRefer to another manual or other pages in this instructionmanual

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Recommendations

If you smell gas:- Do not use a bare flame, do not smoke, do not actuateelectrical contacts or switches ( doorbell, light, motor, lift,etc..),- Cut the gas supply,- Open the windows,- Extinguish all flames,- Evacuate the premises,- Consult your fitter or the maintenance company,- Inform the gas supplier.

In the event of flue gas emanation:- Switch the boiler off,- Open the windows,- Evacuate the premises,- Consult your fitter or the maintenance company.

Advised positions: Boiler- It is forbidden to store inflammable products andmaterials in the boiler room or close to the boiler, eventemporarily,- MCR boilers must be installed in a frost-free environment,- The boiler's ignition device must always be accessible.

Temperature:- The tap water temperature is factory set at 55°C; thistemperature can be set to 65°C- The maximum temperature that the water can reach in theboiler is 95°C. The temperature in the radiators can reachthe maximum value programmed for the boiler,- When the boiler is operating, the discharge conduit mayreach a higher temperature.

Maintenance: We recommend doing this at least once a yearMaintenance and cleaning of the heater must be carried out atleast once a year by a qualified technician.

Installation, commissioning, maintenance and repairs must becarried out by authorised specialists (approved heatingengineers / installers).

For a proper operating of the boiler, follow carefully theinstructions.

Aeration

France: the cross section of the aeration vent, which is compulsoryin the premises in which the boiler is installed, must comply with theDTU 61.1 (P 45 204) standard and, in particular, with the instructionon general improvement work (Book 1764 April 1982).Belgium:the cross-section of the aeration vents, which arecompulsory in the room in which the boiler is installed, must complywith the NBN B 61-002,NBN D 51-003,NBN D 51-006 standard.

The air inlet into the premises must in no event beobstructed, even partially.

Maintenance

The boiler must be serviced and fully cleaned and the flue gasconduit swept by a qualified professional at least 1 times per year.We recommend that you take out a maintenance contract.

Precautions against frost

MCR boilers must be installed in a frost-free environment.

If the temperature of the central heating water in the boiler falls toomuch, the integrated protection device switches itself on:- If the water temperature is lower than 7°C, the circulating pump is

activated,- If the water temperature is lower than 3°C, the boiler is activated,- When the water temperature is above 10 °C, the boiler is switched

off and the circulation pump runs for another 15 minutes.

If a room thermostat, connected via connectors 7 and 8, isactivated, the boiler will operate permanently until itreaches the outlet setting point.

This function is a protection device for the boiler only, notfor the system or buiding fabric.

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Control panel

The control panel of the MCR boiler has 6 function keys, an on/offswitch and a screen.

The display includes 4 positions and several symbols which indicatethe operating status of the control panel and any disturbances.Figures, points and/or letters may be displayed.The symbols located above the function keys indicate their currentfunction.When a key has not been touched for 3 minutes, the display lightinggoes out and only the symbols , and are displayed. Pressing on any key will display the current status of the boiler andthe current command code. If there is a malfunction, thecorresponding code continues to be displayed.

A Menu keyB DisplayC Main ON/OFF switchD Pressure gaugeE Sweep keyF "Escape" or "Reset" keyG Heating temperature adjustment key or -H DHW temperature adjustment key or +J Maintenance key or enter

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1 Parameter display

The following parameters can be displayed in the information menu:

- t1 = Flow temperature (°C)- t2 = Return temperature (°C)- t3 = Tank sensor (°C)- t4 = Outside temperature (°C)- FL = Ionisation current (µA)- nF = Fan speed (rpm)

- Press the key. The symbol flashes. To access theparameters, press key .

- Press the + key successively to scroll down the variousparameters.

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2 Setting different parameters

Parameters P1 to P6 can be modified by the user in order to meetcentral heating and DHW comfort needs.- Press key several times until the symbol flashes on the menu

bar.- Press the key. The symbol P:1 appears. The symbol 1

flashes.- Press the key a second time. The symbol 75 appears (75 °C:

Factory setting).- Press the - or + key to modify the value.- To confirm, press the key. The symbol P1 appears (The

symbol 1 flashes).- Press key 2 time to return to the current operating mode.

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3 Setting the manual mode

- Press key several times until the symbol flashes on themenu bar.

- Press the key. The minimum outlet temperature P1 or the textAuto is displayed if an outside temperature sensor is installed.

- Press the + key to increase the outlet temperture manually.- To confirm, press the key.The installation is in manual mode.- Press key 1 time to deactivate the manual mode.- Press key 1 time to return to the current operating mode.

Parameter Description CommentsFactory setting

24 24/28MI 30/35MI 34/39MIP1 Flow temperature Tset 20 to 85 °C 75 °CP2 DHW Tset 40 to 65 °C 55 °C

P3 Boiler regulation

0 = Heating programme deactivated, DHW programme deactivated

2 1 1 1

1 = Heating programme activated, DHW programme active2 = Heating programme activated, DHW programme deactivated3 = Heating programme deactivated, DHW programme active

P4 Energy-saving mode0 = Comfort

21 = Energy-saving mode2 = Regulation operated by the controller

P5 Anticipation resistance0 = No anticipation resistance for the ON/OFF thermostat

01 = Anticipation resistance for the ON/OFF thermostat

P6 The screen goes off automatically

0 = The screen stays off21 = The screen stays on

2 = The screen goes off automatically (After 3 minutes)

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4 Modifying the water outlet temperature in the heating installation

- Starting from the current operating status, press key .- The symbol and the current temperature are displayed.- Press the + or - key to modify the value.- To confirm, press the key.

5 Switching off the central heating (In summer mode)

- Starting from the current operating status, press key .- The symbol and the current temperature are displayed.- Press the - key until the OFF symbol is displayed.- Press the key to modify the setting.- The symbol appears.

production of domestic hot water: activated.

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6 Setting the domestic water temperature

- Starting from the current operating status, press key .- The symbol and the current temperature are displayed.- Set the temperature using keys + and -.- Press the - key until the OFF symbol is displayed.- Press the key to modify the setting.- The symbol appears.

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7 Modifying the comfort setting (ECO)

The user can consult or modify the following 3 settings:- ON = Activation of the energy-saving setting.- OFF = Activation of the comfort setting- AUTO = Setting dependent on the control unit (=Factory setting).

- Press the key. The symbol flashes.- Press the key a second time. The symbol ECO flashes.- To confirm, press the key.- The current operating status is shown on the display: ECO.- Press the key to return to the ECO menu or press the + key

to modify the status.- To confirm, press the key.- Press key 1 time to return to the current operating mode.

In ECO mode: If the ECO mode is set to , when the boiler is used with anexternal hot water tank, the water is not heated. If the hot watertank is empty, the tap water will therefore be cold.

In ECO mode: AutoIf the setting is on Auto and the control unit is fitted with a ECOfunction, the appliance adapts to the control unit setting.For example: The ECO setting is tripped at night during reducedtemperature operation.

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Troubleshooting

When you inform your fitter of an error, tell him:

- Boiler type,- Serial number. These indications can be found on the rating plate

affixed on the bottom of the boiler.- Type of gas used.

Problem Probable causes Solution

There is no domestic hot water

The boiler is not workingCheck that the boiler is switched onCheck the fuses and switchesGas stop valve open

The water level and/or pressure are too low (<1 bar) Check the water pressure in the installation

The energy-saving shower head is allowing too little water to pass Clean the shower head; replace it if necessary

The radiators are cold

The boiler thermostat is set too low Set the room thermostat or the regulator

The radiator valves are closed Open the valves on all radiators connected to the heating system

The boiler is not workingCheck that the boiler is switched onCheck the fuses and switchesGas stop valve open

The water level and/or pressure are too low Top up the installation with water

The boiler is not working

The boiler thermostat is set too low Set the room thermostat or the regulator

The boiler is not workingCheck that the boiler is switched onCheck the fuses and switchesGas stop valve open

The water level and/or pressure are too low Top up the installation with water

Internal problemTo restart the boiler, press the reset button: ResetCorrect the error if possible. If the problem persists, consult your fitter

The minimum operating pressure of the gas must be sufficiently high

Check the gas pressure upstream from the boilerCheck that the manometer is working correctly

The water level and/or pressure are too low (<1 bar)

The water level and/or pressure are too low Top up the installation with waterCarry out a visual check for the presence of any water leaks Contact your fitter

Significant variations in domestic hot water temperature Insufficient water supply Check the pressure of the installation: Open the valve

Clicking in the central heating pipes/Radiator circuit

The central heating pipe connections are too tight Loosen the connectionsGrease the connections

Ensures that there is no air in the heating pipesIt is essential that you bleed any air in the calorifier, the conduits or the taps to prevent the annoying noises likely to be produced during heating or when drawing off water

The water is circulating too quickly in the central heating system Contact your fitter

Significant water leak under or close to the boiler The boiler or central heating pipes are damaged Contact your fitter

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Filling, bleeding and draining the installation

The water pressure in the boiler must be between 1.5 and 2 bar. Addwater to the installation if necessary.

Filling the heating circuit

Switch the boiler off.

- Open the valves on all radiators connected to the heating system.- Set the room thermostat to as low a temperature as possible.

Ensure that the boiler is switched off.

Wait until the temperature drops below 40°C and the radiators seemcold before filling the central heating system.

When filling the system, use the disconnecteur.

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1 2

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- Open the valve (1/4 turn).- Close the disconnecteur when the manometer indicates a

pressure of 2 bar.

- Fill the low flow heating circuit using the drainage tap in order tofavor the bleed.

- When the pump has stopped, bleed again and top up the waterpressure.

Filling and bleeding the installation 2 times a year should be sufficientto obtain an adequate hydraulic pressure. If it is often necessary to top up the installation with water, contactyour fitter.- Reset the boiler.

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Bleeding the heating system

It is essential that you bleed any air in the calorifier, the conduits orthe taps to prevent the annoying noises likely to be produced duringheating or when drawing off water.

- Open the valves on all radiators connected to the heating system.- Set the room thermostat as high as possible. Wait until the

radiators are hot.

- Switch the boiler off.

The radiators are cold.

- Bleed the radiators.

- Open the bleed connection using the bleed key provided whilstkeeping a rag pressed against the connection.

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- Wait until water comes out of the bleed valve and then close thebleed connection.

The water may still be hot.

- Check regularly that the installation contains water and ispressurised. Add water to the installation if necessary.

- Switch on the boiler. A bleed cycle of a duration of around 3minutes is carried out automatically.

- Set the room thermostat or the regulator.

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Draining the heating circuit

It may be necessary to drain the boiler if the radiators have to bereplaced in the event of significant leakage or danger of frost.

- Open the valves on all radiators connected to the heating system.

- Set the room thermostat to as low a temperature as possible.

- Switch the boiler off.

- The radiators are cold.

- Connect a hose and open the drainage valve at the lowest point ofthe installation.

The water may still be hot.

- Open the bleed connection using the bleed key provided whilstkeeping a rag pressed against the connection. If water continuesto escape, close the connection and try again later.

- Open the valves on all radiators connected to the heating system.

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MCR boiler off

Before any work is carried out on the equipment / heating system, thepower supply must be disconnected (by means of the appropriatefuse or main switch, for example) and warning must be given beforeany reconnection.In the event of prolonged absences (weekend, holidays): Switch theboiler off.Boiler with antifreeze protection

- Set the room thermostat or the regulator: for example 10 °C.

- Define parameter P4 as 1 (energy-saving mode); the heatretention function will be deactivated.

The boiler will then only start up to protect itself from frost.

Boiler without antifreeze protection

If the central heating system is not used for a long period, werecommend switching the boiler off.

- Close the gas valve.

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0

Switch on the boiler

- Checking the hydraulic pressure. The hydraulic pressure must bea minimum of 1 bars. Add water to the installation if necessary.

- Turn the boiler on. The boiler launches the start-up program.The display shows F XX: Software versionThe display shows P XX: Parameter version- The boiler will begin an automatic venting-programm (which lasts

approx. 3 minutes) and will do this every time the power supply isisolated. The version numbers are displayed alternately.

- The display shows :- 1: Ventilation- 2: Ignition- 4: Only domestic hot water operating- 7: Boiler pump operating for DHW heating- 0: The boiler goes into standby mode

- Set the boiler regulation to the desired values. The boiler will thenoperate automatically.

Error codeIf the boiler does not operate normally, an error message isdisplayed.If there is a problem, contact your fitter, specifying the alarmcode.

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Maintenance and periodic checks

- Checking the hydraulic pressure. Insufficient pressure: add water(1.5 - 2 bar).

- Carry out a visual check for the presence of any water leaks.

- Open and close the radiator valves several times a year (thisprevents the valves from seizing up).

- Clean the outside of the boiler using a damp cloth and a lightdetergent.

Maintenance and cleaning of the heater must be carried outat least once a year by a qualified technician.

We recommend taking out a maintenance contract.

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Warranty

You have just purchased one of our appliances and we thank you

for the trust you have placed in our products.

Please note that your appliance will provide good service for a

longer period of time if it is regularly checked and maintained.

Your fitter and our customer support network are at your disposal

at all times.

Warranty terms

Starting from the purchase date shown on the original fitter's

invoice, your appliance has a contractual guarantee against any

manufacturing defect.

The length of the guarantee is mentioned in the price catalogue.

The manufacturer is not liable for any improper use of the

appliance or failure to maintain or install the unit correctly (the

user shall take care to ensure that the system is installed by a

qualified fitter).

In particular, the manufacturer shall not be held responsible for

any damage, loss or injury caused by installations which do not

comply with the following:

- applicable local laws and regulations

- specific requirements relating to the installation, such as

national and/or local regulations

- the manufacturer's instructions, in particular those relating to

the regular maintenance of the unit

- the rules of the profession

The warranty is limited to the exchange or repair of such parts as

have been recognised to be faulty by our technical department

and does not cover labour, travel and carriage costs.

The warranty shall not apply to the replacement or repair of parts

damaged by normal wear and tear, negligence, repairs by

unqualified parties, faulty or insufficient monitoring and

maintenance, faulty power supply or the use of unsuitable fuel.

Sub-assemblies such as motors, pumps, electric valves etc. are

guaranteed only if they have never been dismantled.

France

The preceding dispositions are not exclusive of benefits for the

purchaser of the legal guarantee as stated in Civil Code articles

1641 to 1648.

Belgium

The preceding dispositions about the contractual guarantee are

not exclusive of profit if the need arises for the purchaser in

Belgium of the applicable legal dispositions on hidden defects.

Switzerland

The application of the warranty is subject to the terms and

conditions of sale, delivery and warranty of the company

marketing our products.

Other countries

The above provisions do not restrict the benefit of the legal laws

regarding hidden defects applicable in the buyer's country.

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DE DIETRICH THERMIQUE S.A.S.www.dedietrich.com

DE DIETRICH HEIZTECHNIKwww.dedietrich.com

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DE DIETRICH HEIZTECHNIKwww.dedietrich.com

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