Buderus Logamatic EMS RC35 User manual

Operating instructions Room controller
Logamatic EMS
6 720 618 477-00.1RS
Programming unit RC35
6 720 801 386 (2011/05) GB

Overview of controls
Logamatic EMS – 6 720 801 386 2011/05
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Overview of controls
Key to diagram:
1Flap; pull the recessed grip on the
left to open
2Display
3Rotary selector for changing values
and temperatures or for moving
within the menus
4 Keys for basic functions: When the LED lights up,
“AUT” (automatic) • the switching program is active (automatic changeover between
day and night room temperatures).
“Day mode” (manual) • the heating system operates at the set day room temperature.
The DHW is switched on (basic setting).
“Night mode” (manual) • the heating system operates at the set night room temperature.
Frost protection is active.
DHW heating is off (default setting).
“DHW” • the DHW temperature has fallen below its set value. The DHW
can be reheated by pressing the button (the LED will then flash).
5Keysfor
additional functions:
Function:
“Menu/OK” Open the user menu and confirm the current selection.
When the rotary selector is turned simultaneously: change setting.
“Clock time” Set the time.
“Date” Set the date.
“Flow/returntemperature” Set the room temperature.
“Info” Open the Info menu (to view values).
“Back” Go back one step or one menu item.
In automatic mode the LED for the display of the current operating mode (“day mode” or “night mode”) also
lights up in addition to the LED “AUT”. Exception: with boilers with UBA1.x only the LED “AUT” lights up.
The “DHW” LED can also be switched off. With boilers with UBA1.x the “DHW” LED does not light up at all.
6 720 618 477-08.1RS
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Logamatic EMS – 6 720 801 386 2011/05 3
Table of contents
Table of contents
Overview of controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Guide to instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1 Key to symbols and safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Information about the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Correct use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 EU Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Principles of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Notes on range of functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Setting the operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 Changing the room temperature temporarily . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Changing the room temperature permanently . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Setting the room temperature for particular heating circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7 Setting the date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8 Setting DHW functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.9 Viewing information (Info menu) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.10 Messages on the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.11 Shutting down/switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5 Operation with the user menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1 Introduction to the user menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2 Overview of the user menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3 Selecting a heating circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.4 Setting standard display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5 Selecting the operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5.1 Operating modes for RC35 heating circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5.2 Operating modes for DHW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.5.3 Operating modes for DHW circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.5.4 Operating modes for solar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6 Setting the switching program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table of contents
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5.6.1 Selecting a program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.6.2 Viewing the current program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.6.3 Changing the switching point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.6.4 Entering a switching point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.6.5 Deleting a switching point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.6.6 Setting room temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.7 Setting a DHW program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.8 Setting a DHW circulation program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.9 Setting the switchover threshold for summer/winter mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
5.10 Setting the summer/wintertime changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.11 Setting the domestic hot water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.12 Setting holiday mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.13 Setting the party function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.14 Setting the pause function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.15 Setting thermal disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.16 Calibrating the room temperature display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.17 Setting the preheating phase for a Loganova gas heat pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.18 Setting energy price ratio for hybrid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6 Information on setting the programming unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.1 Control modes for heating control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.2 Tips for energy efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.1 Frequently asked questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.2 Fault messages and service messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.3 Clearing faults (reset) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8 Setup report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9 User overview of RC35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Logamatic EMS – 6 720 801 386 2011/05 5
Guide to instructions
Guide to instructions
These operating instructions contain all information on the function and operation of the Logamatic
RC35 programming unit.
Introduction to the user menu
Chapter 5.1 explains in detail the steps needed for programming all the settings in the user menu.
Operation is only briefly dealt with in the following sections.
Display texts
Words appearing on the display are shown in bold in the text.
Example: USER MENU standard display
operation modes
switching programme
sum./win. threshold
USER MENU

Key to symbols and safety instructions
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1
1 Key to symbols and safety instructions
1.1 Explanation of symbols
Warnings
Keywords at the start of a warning indicate the type and severity of the ensuing risk if measures to
prevent the risk are not taken.
•NOTE indicates that material losses may occur.
•CAUTION indicates that minor to medium injury may occur.
•WARNING indicates that serious injury may occur.
•DANGER indicates a risk to life.
Important information
Additional symbols
Warnings in this document are framed and identified by a warning triangle printed
against a grey background.
If there is a risk of electric shock, the exclamation mark in the warning triangle is
replaced by a lightning symbol.
Important information where there is no risk to people or property is indicated with the
adjacent symbol. It is bordered by lines above and below the text.
Symbol Explanation
BAction step
ÆCross-reference to other parts of this document or to other documents
• List/list entry
– List/list entry (second level)
Table 1

Logamatic EMS – 6 720 801 386 2011/05 7
Key to symbols and safety instructions 1
1.2 Safety instructions
Installation and commissioning
BObserve these instructions to ensure satisfactory operation.
BThe appliance must only be installed and commissioned by an authorised installer.
Damage through operator error
Operator errors can lead to injuries and/or material losses.
BEnsure that children never operate this appliance unsupervised or play with it.
BEnsure that only individuals who can operate this appliance correctly have access to it.
Risk of scalding at the hot water draw-off points
BDuring thermal disinfection: do not draw DHW without mixing in cold water as well.
BIf the DHW temperatures are set to above 60 °C: do not draw DHW without mixing in cold water
as well.
Warning: frost
The heating system can freeze up in cold weather if it is not in operation:
BLeave the heating system permanently switched on.
BIn case of faults: remedy any faults immediately.

Getting started
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2
2 Getting started
Initial situation: the flap is closed.
What do I do ... Operation Display/result
if it is temporarily
too cool/warm on
this day throughout
the whole home?
BTurn rotary selector.
The current room temperature setting
starts flashing.
BSet the desired room temperature with
the rotary selector.
BLet go of the rotary selector.
The modified room temperature is saved
(and stops flashing).
The standard display reappears.
In automatic mode, the modified room
temperature remains active until the next
changeover between night/day mode.
if it is permanently
too cool/warm in the
entire home?
ÆChanging room
temperature and
activating automatic
mode.
BChanging the day room temperature:
Hold the button pressed down and
simultaneously turn the rotary
selector.
BChanging the night room temperature:
Hold the button pressed down and
simultaneously turn the rotary
selector.1)
BWe recommend activating automatic
mode:
Press button.
The modified room temperatures are
saved. The LED next to the button
lights up.
Table 2 Getting started – room temperatures
SET ROOM TEMPERATURE
Until next switch
point, room temp.
changed to:
SET ROOM TEMPERATURE
Room temperature
setting for daytime
operation.
Automatic operation
selected.
Change between:
day:
night:

Logamatic EMS – 6 720 801 386 2011/05 9
Getting started 2
Getting started – additional functions
for one-off heating
outside the usual
times (outside the
switching
program)?
ÆManual day mode
(“continuous
heating“); automatic
mode is switched
off
BActivate manual day mode: press .
The LED next to the button lights up.
To end the one-off heating phase:
BActivate automatic mode again:
press .
The LED next to the button lights up.
to save energy
during long
absences?
ÆManual night
mode (“permanently
reduced”);
automatic mode is
switched off
BActivate manual night mode: press .
The LED next to the button lights
up.1)
When you return:
BActivate automatic mode again:
press .
The LED next to the button lights up.
1) If 'Shutdown' is set as the night reduction mode, the heating is shut down at night. A night time room
temperature cannot be set. The display will show a message to this effect.
With larger heating systems with several heating circuits please note:
The changes in room temperature described above apply to all heating circuits, which
are allocated to the RC35 programming unit (so-called RC35 heating circuits Æ
page 26). This is the standard application.
However, if you wish to change the room temperature for other heating circuits: see
page 37.
Some of the following functions are accessible via the user menu. To learn how to use
this menu, read the section starting on page 23.
What do I do ... Operation Display/result
Table 2 Getting started – room temperatures
You have selected
daytime operation.
The room temperature
set is:
You have selected
nighttime operation
The room temperature
set is:

Getting started
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2
What do I do ... Operation Display/result
to save energy when
on holiday?
BSet holiday mode in the user menu
(Æpage 40).
to change the
holiday
temperature?
Requirement: holiday mode is active.
BTurn rotary selector.
The room temperature is changed for the
rest of the holiday period.
in summer (DHW
only, no central
heating)?
The programming unit switches automatically
between summer mode and winter mode,
triggered by temperature. However, if you
want to switch the system over manually:
BAt the boiler programming unit set the
rotary selector to “0” or deactivate the
heating system.
BLeave the RC35 settings unchanged.
Example: BC10 on the
boiler
if I feel too cool or
too warm in spring
or autumn?
BChange the setting for the summer/winter
switchover threshold in the user menu
(Æpage 39).
-or-
BUse manual mode.
when the clocks
change between
summer and
wintertime?
The RC35 programming unit automatically
adjusts its clock for summer or wintertime
(Æpage 39).
if my day/night
rhythm changes
(e.g. shift work)?
BSelect a different switching program in the
user menu (Æpage 31).
BIf necessary, adjust the switching program
to suit your needs: change, insert or delete
switching points (Æpage 34).
to change the
contrast on the
display?
BChanging the contract: hold the and
buttons pressed down and
simultaneously turn the rotary
selector.
Table 3 Getting started – additional functions
SET HOLIDAY MODE
Room temperature set
for holiday mode:

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Information about the appliance 3
3 Information about the appliance
3.1 Product description
The RC35 programming unit makes it easy to operate your Buderus heating system. You can
change the room temperature throughout the whole home with the rotary selector. You only need to
adjust the thermostatic valves on the radiators if it is too cool or too warm in individual rooms.
The automatic mode with its adjustable switching programs ensures energy saving operation by
reducing the room temperature at certain times or shutting down the heating system completely
(adjustable night setback). The heating system is controlled in such a way that you benefit from
optimum heating comfort and minimum energy consumption.
3.2 Correct use
The RC35 programming unit must only be used to operate and control Buderus heating systems in
detached houses and residential buildings.
The boiler must be equipped with EMS (Energy Management System) or UBA1.x (Universal Burner
Automation). We recommend always operating the heating system with a programming unit
(otherwise the system only operates in emergency mode).
3.3 EU Declaration of Conformity
The design and operation of this product conform to the European Directives and the supplementary
national requirements. Its conformity is demonstrated by the CE designation. You can call up the
Declaration of Conformity for this product on the internet at www.buderus.de/konfo or request a
copy from your local Buderus sales office.
3.4 Cleaning
BClean the programming unit only with a damp cloth.
3.5 Disposal
BDispose of packaging in an environmentally responsible manner.
BWhen replacing components, dispose of the used ones in an environmentally responsible
manner.

Principles of operation
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4
4 Principles of operation
4.1 Display
The following elements appear on the display of the RC35 programming unit during standard
operation:
Fig. 1 Elements on the display
1Top information line: standard display (in basic setting: date and time)
2Large display of room or boiler temperature
3Bottom status line: displays various operating modes and indicates any error messages or service
messages (if present)
4Solar symbol (if solar thermal system is installed and active)
4.2 Notes on range of functions
These instructions describe all the possible functions of the RC35. Some
of these functions may not be available, depending on which boiler and
version of the burner control unit are used. For more information, refer to
the relevant chapter. Contact your heating contractor for further details. To
check the version of the combustion unit used (here: UBA1.5), see the help
menu under INFO\VERSIONS (Æpage 20).
You can set (Æpage 29), which value is permanently displayed in the first line of the
standard display (ÆFig. 1,[1]).
If the programming unit is installed on the boiler, the room temperature cannot be
recorded. Instead of the room temperature [2] the boiler temperature (boiler) is then
displayed.
2
3
4
2
1
6 720 618 414-01.1RS
INFO\VERSIONS
RC35 1.02
UBA1.5 1.21

Logamatic EMS – 6 720 801 386 2011/05 13
Principles of operation 4
4.3 Setting the operating mode
You can activate the operating mode directly by pressing the specified key.
Operating mode Key Explanation
Automatic
(recommended setting)
The switching program is active. The system will switch
over automatically between day mode and night mode
at a set time (switching point).1) At night the heating
system is operated with a reduced room temperature
(basic setting, night shutdown also possible).
The DHW is on during the day and off during the night
(basic setting).
The LED for the automatic button is lit up, along with the
LED for either day or night mode, depending on which
is currently active.
1) The automatic day and night modes correspond to the manual day and night modes. The only difference lies
in the automatic changeover.
Continuous heating
(manual day mode)
Factory setting: 21 °C Manual day mode is useful if you
want to heat outside the usual times. Automatic mode is
switched off.
The DHW is on (basic setting).
Only the day mode LED is lit up.
Permanently reduced
(manual night mode)
Factory setting: 17 °C The heating system is operated
with a reduced room temperature (basic setting).
Manual night mode is useful if you are occasionally
absent for long periods. Automatic mode is switched
off.
The DHW is off (basic setting).
Only the night mode LED is lit up.
Table 4 Explanation of the operating modes
The setting via the buttons specified applies to the heating circuits which are allocated
to the RC35 programming unit (so-called RC35 heating circuits, Æpage 26).
To set the operating mode for other heating circuits: Use User menu\operation
modes (Æpage 29).

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4.4 Changing the room temperature temporarily
Follow this procedure if you only want to change the room temperature up until the next switching
point. At the switching point, the system switches over automatically between day and night modes
(Æpage 31). The heating system will then go back to the standard room temperature setting.
Initial situation: the flap is closed.
Ending a temporary change in room temperature
BReturning to automatic mode: press the button.
The automatic program uses the normally set temperatures for day and night mode.
-or-
BReturning to manual mode: press one of the or buttons.
The normally set temperatures for day and night mode are used.
Operation Result
1. Turn rotary selector.
The current room temperature setting starts flashing.
Turn the rotary selector further. Turn the rotary selector
clockwise to increase the room temperature and anti-
clockwise to lower it.
2. When the desired room temperature is reached: let go of the
rotary selector.
The modified room temperature is saved (and stops flashing).
The standard display reappears.
In manual mode, the LED next to is not lit up. In this case, the modified room temperature
applies until you press , or .
Table 5 Changing the room temperature temporarily
If the heating system is equipped with a RC2x remote control (Æpage 27), and the date
of manufacture of the remote control is January 2006 or later, the room temperature can
also be modified temporarily at the remote control.
SET ROOM TEMPERATURE
Until next switch
point, room temp.
changed to:
SET ROOM TEMPERATURE
Until next switch
point, room temp.
changed to:

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4.5 Changing the room temperature permanently
NOTE: System damage through frost!
If room temperatures are set below 10 °C, rooms may cool down so much that pipes in
external walls (for example) may freeze in cold weather.
BSet room temperatures higher than 10 °C.
Operation Result
1. Changing the day room temperature: Hold the button
pressed down and simultaneously turn the rotary selector.
2. Changing the night room temperature1): Hold the button
pressed down and simultaneously turn the rotary
selector.
1) If “shut-down mode” is selected as the night setback mode, the heating system will be switched off at night.
A night time room temperature cannot be set. The display will show a message to this effect.
3. We recommend activating automatic mode. Automatic mode
ensures automatic switchover between day and night mode
(night setback).
Press .
Automatic mode is now active with the modified room temperatures. The LED next to the
button lights up. The standard display reappears.
Table 6 Changing the room temperature permanently
SET ROOM TEMPERATURE
Room temperature
setting for daytime
operation.
SET ROOM TEMPERATURE
Room temperature
setting for nighttime
operation.
Automatic operation
selected.
Change between:
day:
night:

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4.6 Setting the room temperature for particular heating circuits
If the heating system comprises several heating circuits (Æpage 27), you can adjust the room
temperature for selected heating circuits with .
Only heating circuits which are not equipped with an RC2x remote control unit will be displayed. No
selection is required if there is only one heating circuit. All RC35 heating circuits have the same
room temperature target values.
If the selection is not required or if you select RC35 heating circuits, set the same temperatures
as described in page 15.
BOpen the flap (by pulling the recessed grip on the left).
BPress and release it again.
BSelect the heating circuit (Æpage 26 – 28). Heating circuit selection is not available if only one
heating circuit is installed.
BChanging the day room temperature: Hold the button pressed down and simultaneously turn
the rotary selector, until the desired temperature is reached. Release the button.
The required temperature is saved.
BTurn the rotary selector to switch to night room temperature.
BChanging the night room temperature: Hold the button pressed down and simultaneously
turn the rotary selector, until the desired temperature is reached. Release .
The required temperature is saved.
BPress several times or shut the flap to return to the standard display.
The modified room temperatures are now active.
NOTE: System damage through frost!
If room temperatures are set below 10 °C, rooms may cool down so much that pipes in
external walls (for example) may freeze in cold weather.
BSet room temperatures higher than 10 °C.
If “shutdown operation“ is selected as the night setback mode, the heating system will
be switched off at night. A night time room temperature cannot be set. The display will
show a message to this effect.

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4.7 Setting the date and time
Your heating system requires the date and time to operate correctly. The clock keeps running for
about 8 hours in the event of a power failure. If a power failure lasts longer than that, the display will
indicate that you need to reset the date and time.
Setting the date:
1. Open the flap (by pulling the recessed grip on the left).
2. Press . The year starts flashing.
3. Setting year: Hold the button pressed down and simultaneously turn the rotary selector.
4. Release button. The year is saved.
5. Repeat steps 2 to 4 to set the month and day.
The set date is displayed briefly. The standard display then reappears.
Setting the time:
1. Press . The hours start flashing.
2. Setting hours: Hold the button pressed down and simultaneously turn the rotary selector.
3. Release button. The hours are saved.
4. Repeat steps 1 to 3 to set the minutes.
The set time is displayed briefly. The standard display then reappears.

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4.8 Setting DHW functions
Risk of scalding through DHW temperatures over 60 °C!
WARNING: Risk of scalding!
The factory setting for the DHW temperature is 60 °C. There is a risk of scalding at the
hot water draw-off points if the temperature is set higher than this and also following
thermal disinfection.
BIf the temperature set is higher than 60 °C or following thermal disinfection, never
open any hot water tap without mixing in cold water as well.
What? What is it for? Operation
Initial situation: the flap is closed.
Changing DHW temperature
In the basic setting DHW is available
during the heating phases (day/night) of
the selected switching program. The water
in the DHW cylinder is heated once in the
morning for 30 minutes before central
heating starts.
If your heating system is equipped with a
remote control unit (e.g. RC2x,
Æpage 27), the DHW temperature for the
entire heating system can also be changed
at the remote control unit.
BChanging DHW temperature: Hold the
button pressed down and simultaneously
turn the rotary selector.
If you receive a message that the setting is not
possible:
On the boiler programming unit set the
rotary selector to “AUT”1). or activate DHW.
Table 7 Setting DHW functions

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Heating up DHW once1)
To save energy, during day mode DHW is
only reheated automatically when its
temperature falls 5 °C below the set DHW
temperature.
If you need large amounts of hot water one
evening or outside the set times for day
mode, you can heat up the DHW.
This function is not available with boilers
with UBA1.x.
You can see by the lighting-up of the LED of the
button, that the DHW temperature has fallen
below the set value2).
BTo heat up the DHW manually: press .
The LED on the button starts flashing2).
Heat-up starts, and is later terminated
automatically.
If no heating is necessary (because the water is
still hot), a message will appear. Only the DHW
circulation pump will start (if fitted) to transport
the hot water more quickly to the draw-off points.
BIf you want to stop the heating process:
press again.
Heating up DHW regularly If you regularly need large amounts of hot water
outside the set times for day mode, you can set a
separate program for DHW (Æpage 38).
Switching thermal disinfection on/off
This function heats up the DHW to a
temperature sufficient to kill pathogens
(e.g. legionella).
BSet thermal disinfection (Æpage 44).
1) Setting depends on the boiler used
2) The “DHW LED can also have been switched off by the specialist heating company”
What? What is it for? Operation
Table 7 Setting DHW functions

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4.9 Viewing information (Info menu)
You can use the INFO menu to view set and recorded values. The exact information available
depends on the components installed in your heating system.
DHW message in the menu INFO
DHW is switched off at the boiler. This message means that on the boiler programming unit the
rotary selector is set to “0”. In order to enable the DHW to be set via RC35, set the rotary
selector to “AUT”1).
Operation Result
1. Open the flap (by pulling the recessed grip on the left).
2. Press to open the INFO menu.
The message on the right is displayed for five seconds. It then
moves on automatically.
-or-
turn the rotary selector to go immediately to the next
display.
3. Turn the rotary selector to display more information.
4. To exit the info menu: press or close the flap.
The standard display reappears.
Table 8 INFO menu
1) Setting depends on the boiler used
The operating mode buttons do not do anything in the INFO menu.
tFr
By turning the dial
you can obtain plant
information.