DeDietrich MCR 24 User manual

MCR 24, 24/28MI, 30/35MI, 34/39MI
Wall-hung gas condensation boilers
Instructions for
use
English
08/06/06

Contents
MCR 24, 24/28MI, 30/35MI, 34/39MI 08/06/06 - 300008487-001-A
Symbols used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1 Parameter display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2 Setting different parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3 Setting the manual mode . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4 Modifying the water outlet temperature in the heating installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5 Switching off the central heating (In summer mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
6 Setting the domestic water temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
7 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 in
order to guarantee the optimal operation of your appliance. We are sure that you will not be disappointed and that it will satisfy all of your
expectations.
Symbols used
Caution danger
Risk of injury and damage to equipment. Attention must be
paid to the warnings on safety of persons and equipment
Important information
Information must be kept in mind to maintain comfort
ZReference
Refer to another manual or other pages in this instruction
manual

4MCR 24, 24/28MI, 30/35MI, 34/39MI 08/06/06 - 300008487-001-A
Recommendations
If you smell gas:
- Do not use a bare flame, do not smoke, do not actuate
electrical 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 and
materials in the boiler room or close to the boiler, even
temporarily,
- 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; this
temperature can be set to 65°C
- The maximum temperature that the water can reach in the
boiler is 95°C. The temperature in the radiators can reach
the maximum value programmed for the boiler,
- When the boiler is operating, the discharge conduit may
reach a higher temperature.
Maintenance: We recommend doing this at least once a year
Maintenance and cleaning of the heater must be carried out at
least once a year by a qualified technician.
Installation, commissioning, maintenance and repairs must be
carried out by authorised specialists (approved heating
engineers / installers).
For a proper operating of the boiler, follow carefully the
instructions.
Aeration
France: the cross section of the aeration vent, which is compulsory
in the premises in which the boiler is installed, must comply with the
DTU 61.1 (P 45 204) standard and, in particular, with the instruction
on general improvement work (Book 1764 April 1982).
Belgium:the cross-section of the aeration vents, which are
compulsory in the room in which the boiler is installed, must comply
with the NBN B 61-002,NBN D 51-003,NBN D 51-006 standard.
The air inlet into the premises must in no event be
obstructed, even partially.
Maintenance
The boiler must be serviced and fully cleaned and the flue gas
conduit 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 too
much, 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,
- Whenthewatertemperatureis above 10 °C,theboilerisswitched
off and the circulation pump runs for another 15 minutes.
If a room thermostat, connected via connectors 7 and 8, is
activated, the boiler will operate permanently until it
reaches the outlet setting point.
This function is a protection device for the boiler only, not
for the system or buiding fabric.

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Control panel
The control panel of the MCR boiler has 6 function keys, an on/off
switch and a screen.
The display includes 4 positions and several symbols which indicate
the 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 current
function.
When a key has not been touched for 3 minutes, the display lighting
goes out and only the symbols , 2and are displayed.
Pressing on any key will display the current status of the boiler and
the current command code. If there is a malfunction, the
corresponding code continues to be displayed.
A Menu key
BDisplay
C Main ON/OFF switch
D Pressure gauge
E Sweep key
F "Escape" or "Reset" key
G Heating temperature adjustment key or -
H DHW temperature adjustment key or +
J Maintenance key or enter

6MCR 24, 24/28MI, 30/35MI, 34/39MI 08/06/06 - 300008487-001-A
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 Äkey. The symbol flashes. To access the
parameters, press key l.
- Press the +key successively to scroll down the various
parameters.

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2 Setting different parameters
Parameters P1 to P6 can be modified by the user in order to meet
central heating and DHW comfort needs.
- PresskeyÄseveraltimesuntilthesymbolflashesonthemenu
bar.
- Press the lkey. The symbol P:1 appears. The symbol 1
flashes.
- Press the lkey a second time. The symbol 75 appears (75 °C:
Factory setting).
- Press the -or +key to modify the value.
- To confirm, press the lkey. The symbol P1 appears (The
symbol 1flashes).
- Press key 2 time to return to the current operating mode.

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3 Setting the manual mode
- Press key Äseveral times until the symbol flashes on the
menu bar.
- Pressthelkey.The minimum outlettemperatureP1 orthetext
Auto is displayed if an outside temperature sensor is installed.
- Press the +key to increase the outlet temperture manually.
- To confirm, press the lkey.
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 Comments Factory setting
24 24/28MI 30/35MI 34/39MI
P1 Flow temperature Tset 20 to 85 °C 75 °C
P2 DHW Tset 40 to 65 °C 55 °C
P3 Boiler regulation
0 = Heating programme deactivated, DHW programme
deactivated
2111
1 = Heating programme activated, DHW programme
active
2 = Heating programme activated, DHW programme
deactivated
3 = Heating programme deactivated, DHW programme
active
P4 Energy-saving mode 0 = Comfort 21 = Energy-saving mode
2 = Regulation operated by the controller
P5 Anticipation resistance 0 = No anticipation resistance for the ON/OFF thermostat 0
1 = Anticipation resistance for the ON/OFF thermostat
P6 The screen goes off
automatically
0 = The screen stays off 21 = 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 lkey.
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 lkey 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 lkey 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 Äkey. The symbol flashes.
- Press the Äkey a second time. The symbol ECO flashes.
- To confirm, press the lkey.
- The current operating status is shown on the display: ECO.
- Pressthe keytoreturn totheECO menuorpressthe +key
to modify the status.
- To confirm, press the lkey.
- Press key 1 time to return to the current operating mode.
In ECO mode: I
IftheECO modeisset toI,whentheboilerisusedwith an
externalhot water tank, the water isnot heated. If the hot water
tank is empty, the tap water will therefore be cold.
In ECO mode: Auto
Ifthe setting is on Auto and the control unit is fitted with aECO
function, the appliance adapts to the control unit setting.
Forexample:TheECO settingistrippedatnightduringreduced
temperature 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 working Check that the boiler is switched on Check the fuses and switches
Gas stop valve open
The water level and/or pressure are too low
(<1 bar) Check the water pressure in the installation
Theenergy-savingshowerheadisallowingtoolittle
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 working Check that the boiler is switched on
Check the fuses and switches
Gas 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 working Check that the boiler is switched on Check the fuses and switches
Gas stop valve open
The water level and/or pressure are too low Top up the installation with water
Internal problem To restart the boiler, press the reset button: Reset Correct 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 boiler Check 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 water
Carry 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 connections
Grease the connections
Ensures that there is no air in the heating pipes It 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
Thewaterpressurein the boiler must bebetween 1.5 and 2 bar.Add
water 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 seem
cold before filling the central heating system.
When filling the system, use the disconnecteur.
LTALW7H000215b
1
2
3
4

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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 to
favor the bleed.
- When the pump has stopped, bleed again and top up the water
pressure.
Fillingandbleedingtheinstallation2timesayearshouldbesufficient
to obtain an adequate hydraulic pressure.
If it is often necessary to top up the installation with water, contact
your 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 or
the taps to prevent the annoying noises likely to be produced during
heating 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 whilst
keeping a rag pressed against the connection.

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- Wait until water comes out of the bleed valve and then close the
bleed connection.
The water may still be hot.
- Check regularly that the installation contains water and is
pressurised. Add water to the installation if necessary.
- Switch on the boiler. A bleed cycle of a duration of around 3
minutes 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 be
replaced 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.
- Connecta hose andopen the drainage valveat the lowest point of
the installation.
The water may still be hot.
- Open the bleed connection using the bleed key provided whilst
keeping a rag pressed against the connection. If water continues
to 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
Beforeanyworkiscarriedoutontheequipment/heatingsystem,the
power supply must be disconnected (by means of the appropriate
fuse or main switch, for example) and warning must be given before
any reconnection.
In the event of prolonged absences (weekend, holidays): Switch the
boiler 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 heat
retention 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, we
recommend switching the boiler off.
- Close the gas valve.
LTALW7H000217a

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Switch on the boiler
- Checking the hydraulic pressure. The hydraulic pressure must be
a 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 version
The 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 is
isolated. 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 then
operate automatically.
Error code
If the boiler does not operate normally, an error message is
displayed.
If there is a problem, contact your fitter, specifying the alarm
code.

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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 (this
prevents the valves from seizing up).
- Clean the outside of the boiler using a damp cloth and a light
detergent.
Maintenance and cleaning of the heater must be carried out
at least once a year by a qualified technician.
We recommend taking out a maintenance contract.