Moehlenhoff RD 40203 User manual

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RD 40203 | RD 45203
RD 20203 | RD 25203
131496.1533

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Contents
ENG
ENG 4
1 About these instructions...............................................5
1.1 Validity, storage and forwarding of the instructions 5
1.2 Symbols 5
2 Safety............................................................................6
2.1 Intended use 6
2.2 General safety notes 6
3 Device overview............................................................8
4 Operation......................................................................9
4.1 Setting the target temperature 9
4.2 Navigation and settings 9
4.2.1 Lifestyle functions menu 11
4.2.2 Settings menu 15
4.2.3 Service menu 20
5 Comfort and protection functions...............................23
5.1 Comfort functions 23
5.1.1 Smart Start/Smart Stop function 23
5.1.2 Heating/cooling change-over 23
5.2 Protection functions 23
5.2.1 Valve protection function 23
5.2.2 Antifreeze protection 23
6 Maintenance...............................................................24
6.1 Troubleshooting 24
6.2 Cleaning 25

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1 About these instructions
1.1 Validity, storage and forwarding of the instructions
These instructions apply to the room thermostats of the following
types:
- RD 40203-10 – Standard 24V,
- RD 20203-10 – Standard 230V,
- RD 45203-40 – Comfort 24V,
- RD 25203-40 – Comfort 230V,
- RD 45203-60 – Control 24V,
- RD 25203-60 – Control 230V.
These instructions include information necessary for the operation
of the devices. The room thermostats are designated as “Stand-
ard”, “Comfort” and “Control” in order to point out differences
between these types. These instructions must the read completely
and thoroughly before commencing any work with the devices.
These instructions must be kept and to be handed over to future
users. You can view and download these instructions and the asso-
ciated installation instructions under www.ezr-home.de.
1.2 Symbols
The following symbols are used in this manual:
Hazard symbols: Identifies a hazard
Information: Identifies important or useful information
¾User action
9Result from an action
• List without fixed order
1., 2. List with fixed order

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The room thermostat controls, directly or via a connection unit,
thermal actuators connected in a room-by-room temperature con-
trol system. It is suitable for 24V or 230V components, depending
on the variant. The unit serves for
• a fixed installation,
• the registration of the actual temperature (room temperature),
• the setting of the target temperature (comfort temperature)
• the control of the actual temperature by activating actuators
in heating operation (Standard) or heating/cooling operation
(Comfort, Control) in an assigned zone,
• the connection of an external sensor (Control).
Every other use, modification and conversion is expressively forbid-
den and leads to dangers the manufacturer cannot be held liable
for.
All safety notes in these instructions must be observed in order to
avoid accidents with personal damage or property damage.
• Only an authorised electrician may open the device. It may only
be opened in de-energised state.
• Always disconnect from the mains network and secure against
unintended activation before opening.
• Only use the device if it is in flawless state.
• Observe the performance limits of the device and the environ-
mental conditions.
• This device is not intended to be used by persons (including
children) with restricted physical, sensory or mental skills or who
lack experience or knowledge. If necessary, these persons must
2 Safety
2.1 Intended use
2.2 General safety notes

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be supervised by a person responsible for their safety or receive
instructions from this person on how to use this unit.
• Ensure that children do not play with this device. Children must
be monitored if necessary.
• In case of emergency, disconnect the complete room-by-room
temperature control system.
General safety notes

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3 Device overview
Display
Mo Tu We Th Fr Sa Su
0 6 12 18 24 Rotary control with
turn/press mechanism
and fine ratchet
Room thermostats
Type Symbol Meaning Symbol Meaning
Standard
Comfort
Control
Lifestyle functions
menu Temperature unit
Settings menu Target/
actual temp.
Heating Min. temperature
Operating lock Max. temperature
Switching off Make/confirm
entry
Automatic operation Correction of actual
temp. measuring
Day operation Back
Night operation
Service menu Display illum.
Cooling Factory settings
Holiday function Time indications
Time
0 6 12
Comfort programs
Mo Su
Mo Su
Mo Su
Week day Setting the min.floor
temperature1
0 6 12 18 24
Time scale
1Displayed if an external floor sensor is registered.

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4 Operation
WARNING
Danger to life in case of swallowing!
The rotary control can be taken off; children might swallow it.
¾Do not lay down the rotary control near children.
The navigation and settings of the room thermostat are performed
with the rotary control:
+-
The target temperature is set by turning the rotary control
to the left or to the right. Rotating to the left decreases the
temperature, rotating to the right increases it.
By pressing the rotary control, menus are opened and func-
tions are activated, and changed settings are applied.
+-
By rotating the rotary control, settings can be done and
functions and menus can be chosen.
Comfort temperatures for day and night operation can be
stored. A manual or automatic change between the oper-
ating modes day and night operation changes to the stored
temperature. The target temperature can be changed with
the rotary control, independent from the active operating
mode. You can find more information in section Lifestyle
functions menu.
4.1 Setting the target temperature
4.2 Navigation and settings

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Menu selection
Lifestyle functions (Standard, Comfort, Control)
Includes all important basic functions.
Settings (Standard, Comfort, Control)
Includes extended functions and numerous setting pos-
sibilities.
Service (Comfort, Control)
Includes various system parameters. An optimal tuning
of the overall system can be obtained by corresponding
settings.
Back
Leaves the menu selection and returns to the basic level.
The available menus depend on the room thermostat variant.
Basic level
In the basic level, all room thermostats show the current actual
temperature as well as active functions. The Control variant addi-
tionally is equipped with a clock function.
A basic level and three menus are available for navigation and set-
tings:
Navigation and settings
• A selected menu resp. a selected function is displayed
with a flashing symbol.
• If no operation is performed, the display returns to the
basic level after approximately 5 seconds.

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4.2.1 Lifestyle functions menu
This menu allows the setting of the lifestyle functions. Depending
on the room thermostat variant, the settings listed in the graphic
are available. The following pages contain detailed information.
• For the selection of an operating mode (day, night, au-
tomatic operation) only the inactive modes are available
for selection.
• If no operation is performed, the display returns to the
basic level after approximately 30 seconds.
Standard, Comfort and Control
Only Control
+-

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Description Steps
Day operation
Standard
Adjustment to the set target tempera-
ture.
Comfort, Control
Adjustment to the set comfort temper-
aturein the menu Settings.
¾Confirm the selection by
pressing.
9Day operation is activated.
9The basic level is displayed.
Night operation
Standard
The software internally lowers the tar-
get temperature set for day operation
by 2°C.
¾Confirm the selection by
pressing.
9Night operation is selected.
9The basic level is displayed.
The symbol flashes if the target
temperature is changed. The
temperature change is applied
for day operation. Subsequently,
the software re-calculates the re-
duction temperature for night
operation.
Comfort, Control
Adjustment to the set reduction tem-
peraturein the Settings menu.
¾Open the menu selection by pressing.
¾Select the menu Lifestyle functions.
¾Activate the menu by pressing again.
¾Select the desired function.
Lifestyle functions menu

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Description Steps
Automatic operation
Standard, Comfort
The signal of an external system clock
(e. g. from a Control room thermostat)
activates day or night operation.
Control
Automatic temperature control
according to the Comfort programs in
the Settings menu.
¾Confirm the selection by
pressing.
9Automatic operation is
activated.
9The basic level is displayed.
9Control: The time scale is
displayed.
Holiday function
Automatic reduction to the set
holiday temperaturein the Set-
tings menu.
Activate
¾Confirm the selection by
pressing.
¾Set the number of holiday
days by rotating.
¾Confirm the entry.
9The holiday function is acti-
vated immediately.
9The basic level is displayed.
A subsequent change of
the target temperature
deactivates the holiday
function.
Deactivate
¾Observe the operating steps
under “Activation”.
¾Set the number of holiday
days to 00 by rotating.
Lifestyle functions menu

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Lifestyle functions menu
Description Steps
Operating lock
Blocks the room thermostat.
The actual temperature and
all active functions are still displayed,
the possibility to change the target
temperature and the operation are de-
activated.
Activate
¾Confirm the selection by
pressing.
9The operating lock is acti-
vated.
9The symbol is displayed.
9The basic level is displayed.
Deactivate
¾Press the rotary control for >
5 seconds.
9The symbol is deactivat-
ed, operation is possible
again.
Switching off
Switches the room thermostat
off. Temperature control is
deactivated. The protective functions
(valve protection and antifreeze protec-
tion) remain active.
For the room thermostat Control, the
comfort programs from the Settings
menu are still applied. Queued switch-
ing signals are given out to connected
thermostats via the reduction output.
¾Confirm the selection by
pressing.
9All functions are deactivated.
9The symbol is displayed.
9The target temperature is
displayed
Switching on
¾Press the rotary control for >
5 seconds.
9The basic level is displayed.
9All active functions are
displayed.
Back
Leaves the menu.
¾Confirm the selection by
pressing.
9The display is in basic level.

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4.2.2 Settings menu
Extended settings can be made in this menu. Depending on the
room thermostat type, the settings listed in the graphic are availa-
ble. The following pages contain detailed information.
If no operation is performed, the display returns to the basic
level after approximately 30 seconds.
Standard, Comfort and Control
Comfort, Control
Only Control
+-
0 6 12
1

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¾Open the menu selection by pressing.
¾Select the settings menu.
¾Activate the menu by pressing again.
¾Select the desired setting.
Description Steps
Comfort temperature
Heating
Setting the target tempera-
ture for day operation.
¾Confirm the selection by
pressing.
¾Set the target temperature.
¾Confirm the entry by
pressing.
9This is displayed in the Set-
tings menu.
Reduction temperature
Heating
Setting the target tempera-
ture for night operation.
¾Confirm the selection by
pressing.
¾Set the target temperature.
¾Confirm the entry.
9This is displayed in the Set-
tings menu.
Comfort temperature
Cooling
Setting the target tempera-
ture for day operation.
¾Confirm the selection by
pressing.
¾Set the target temperature.
¾Confirm the entry.
9This is displayed in the Set-
tings menu.
Reduction temperature
Cooling
Setting the target tempera-
ture for night operation.
¾Confirm the selection by
pressing.
¾Set the target temperature.
¾Confirm the entry.
9This is displayed in the Set-
tings menu.
Settings menu

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Description Steps
External floor sensor
Setting the minimum floor
temperature.
¾Confirm the selection by
pressing.
¾Make the setting.
¾Confirm the entry.
9The display flashes in the
Settings menu.
This function is displayed if the
connection of an external floor
sensor is defined in the Service
menu under Parameter 040.
Holiday temperature
Setting the target temper-
ature for the holiday func-
tion in the Lifestyle functions
menu.
¾Confirm the selection by
pressing.
¾Set the target temperature.
¾Confirm the entry.
9This is displayed in the Set-
tings menu.
Target temperature
limitation
Setting of the maximum and
minimum settable target tem-
perature.
¾Confirm the selection by
pressing.
¾Set the minimum temper-
ature.
¾Confirm the entry.
¾Set the maximum temper-
ature.
¾Confirm the entry.
9This is displayed in the Set-
tings menu.
Time indications
Setting of time and weekday.
¾Confirm the selection by
pressing.
¾Set the time (hh:mm) and
the weekday by rotating and
apply by pressing.
9This is displayed in the Set-
tings menu.
Settings menu

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Description Steps
0 6 12
Comfort programs
In automatic operation there
is a control with the switching
times of the comfort programs:
• Week (Mon–Sun)
• Weekdays (Mon-Fri)
• Weekend (Sat–Sun)
• Day (Mon, Tue, Wed, Thu, Fri, Sat,
Sun)
Every weekday can include four
switching times (P1 - P4). After reach-
ing the starting time, the comfort
temperature is adjusted. Outside the
switching times control is performed
according to the reduction tempera-
ture. The predefined switching times
can be adapted individually:
Mon–Fri: 5.00 am - 8.00 am
3.00 pm - 10.00 pm
Sat - Son: 6.00 am - 11.00 pm
¾Confirm the selection by
pressing.
9The display switches to the
comfort program overview;
the display indicates “day”.
¾Select and activate a com-
fort program.
¾Select a switching time P1
to P4.
¾Set the start time and the
end time by rotating and
apply by pressing.
¾Return to the comfort
program overview with
“BACK”.
¾Set further switching times
or change to the Settings
menu with “BACK”.
• Automatic operation must be
activated.
• The comfort and reduction
temperatures must be set in
the Settings menu.
• The current time indications
must be set.
Temperature correction
Corrects a deviating measure-
ment of the actual tempera-
ture of the internal sensor by ±2°C in
0.1°C increments.
¾Confirm the selection by
pressing.
¾Set the correction value.
¾Confirm the entry.
9This is displayed in the
Settings menu.
Settings menu

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Description Steps
Display illumination
Sets the brightness of the dis-
play illumination in five levels:
0 Off
25 Level 1
50 Level 2
75 Level 3
100 Level 4
¾Confirm the selection by
pressing.
¾Set the brightness of the
display illumination.
¾Confirm the entry.
9The Settings menu is
displayed.
The display of the setting is sig-
nalled by the time scale.
Factory settings
Restores the factory settings.
All previously made settings
will be reset.
¾Confirm the selection by
pressing.
¾Select the entry “Yes” for
resetting.
¾Press the rotary control for
5 seconds.
9A restart is performed.
The basic level is displayed
subsequently.
The entry “No” cancels
the process.
Back
Leaves the menu.
¾Confirm the selection by
pressing.
9The basic level is displayed.
Settings menu

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4.2.3 Service menu
Room thermostats Comfort and Control!
An optimal tuning of the overall system can be reached by corre-
sponding settings of the system parameters. In order to avoid a
faulty configuration, this menu is protected by a 4-digit PIN (stand-
ard: 1234).
¾Open the menu selection by pressing.
¾Select the Parameter menu.
¾Activate the menu by pressing again.
¾Select the menu entry “Code”.
¾Activate the PIN entry by pressing.
¾Enter the 4-digit PIN (standard: 1234). Select the individual ci-
phers by rotating and confirm by pressing.
¾Start the entry by activating the function “PAr”.
¾Select the individual ciphers of the parameter number by rotat-
ing and confirm by pressing.
¾Activate the entry by selecting “SET” and by pressing.
¾Perform the setting according to the subsequent parameter list.
¾Return to the basic level by selecting “BACK” 2 times.
CAUTION
Damage to the installation!
Faulty configuration can lead to errors and installation damage.
¾Only authorised specialists may perform settings.
If no operation is performed, the display returns to the basic
level after approximately 30 seconds.