Buderus RC30 Operating Instructions Manual

6303 8006 – 02/2006 GB For the user

Please read thoroughly before use.

Operating instructions

RC30 programmable room
thermostat

Also applies to the following accessories: mixing
valve module MM10 and low loss header module
WM10

Contents

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

2 What you should know about your heating system. . . . . . . 5

2.1 How does the RC30 work? . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Control modes for the RC30 . . . . . . . . . . . . . . . . . . . . . . . 6

2.3 Why do the thermostatic radiator valves have to stay fully open? 7

2.4 Why do I need a heating program? . . . . . . . . . . . . . . . . . . . 8

2.5 What are heating circuits? . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Tips on economical heating . . . . . . . . . . . . . . . . . . . . . . . .11

4 For your safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

4.1 Correct use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

4.2 Please observe these notes. . . . . . . . . . . . . . . . . . . . . . . .13

4.3 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

4.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

4.5 Other notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

5 First steps with your RC30. . . . . . . . . . . . . . . . . . . . . . . . .15

5.1 Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

5.2 Quick reference guide . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.3 Switching on and off . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

6 Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

7 Basic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

7.1 Changing the room temperature directly. . . . . . . . . . . . . . . .20

7.2 Selecting the operating mode . . . . . . . . . . . . . . . . . . . . . .20

7.3 Setting the room temperature . . . . . . . . . . . . . . . . . . . . . .24

7.4 Heating domestic hot water. . . . . . . . . . . . . . . . . . . . . . . .26

8 Extended functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

8.1 Buttons for extended functions . . . . . . . . . . . . . . . . . . . . .30

8.2 Using the extended functions . . . . . . . . . . . . . . . . . . . . . .30

8.3 Displaying operating menu . . . . . . . . . . . . . . . . . . . . . . . .31

8.4 Setting the date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

8.5 Setting the time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

8.6 Selecting a heating circuit. . . . . . . . . . . . . . . . . . . . . . . . .35

2 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

Contents

8.7 Changing settings for another heating circuit . . . . . . . . . . . . 37

8.8 Selecting and modifying a heating program . . . . . . . . . . . . . 39

8.9 Selecting a preset heating program . . . . . . . . . . . . . . . . . . 40

8.10 Overview of the preset heating programs . . . . . . . . . . . . . . . 41

8.11 Modifying the heating program by moving switching points . . . 42

8.12 Creating a new heating program . . . . . . . . . . . . . . . . . . . . 45

8.13 Adding switching points . . . . . . . . . . . . . . . . . . . . . . . . . 47

8.14 Deleting switching points. . . . . . . . . . . . . . . . . . . . . . . . . 48

8.15 Setting the operating mode for domestic hot water . . . . . . . . . 50

8.16 Entering a DHW program . . . . . . . . . . . . . . . . . . . . . . . . . 51

8.17 Setting the operating mode for DHW circulation. . . . . . . . . . . 53

8.18 Entering a DHW circulation program . . . . . . . . . . . . . . . . . . 54

8.19 Changing the standard display . . . . . . . . . . . . . . . . . . . . . 55

9 Special functions (additional menu). . . . . . . . . . . . . . . . . . 56

9.1 Opening and using the additional menu . . . . . . . . . . . . . . . . 57

9.2 Setting the holiday function . . . . . . . . . . . . . . . . . . . . . . . 58

9.3 Setting the bank holiday function . . . . . . . . . . . . . . . . . . . . 62

9.4 Calibrating the room temperature. . . . . . . . . . . . . . . . . . . . 64

9.5 Setting the Party function. . . . . . . . . . . . . . . . . . . . . . . . . 66

9.6 Setting the Pause function . . . . . . . . . . . . . . . . . . . . . . . . 67

9.7 Thermal disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

9.8 Changing the standard display . . . . . . . . . . . . . . . . . . . . . 70

9.9 Switching on the button lock. . . . . . . . . . . . . . . . . . . . . . . 71

9.10 Setting summer/winter changeover. . . . . . . . . . . . . . . . . . . 72

9.11 Automatic summer and winter time adjustment . . . . . . . . . . . 75

9.12 Setting the preheat phase for a gas-operated heat pump
(not in the UK)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

10.1 Frequently asked questions . . . . . . . . . . . . . . . . . . . . . . . 78

10.2 Fault table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

11 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

3

Introduction1

1 Introduction

The RC30 makes it easy to operate your Buderus heating system
and forms part of the Energy Management System (EMS). The
heating system is controlled in such a way that you benefit from
optimum heating comfort and minimum energy consumption.

The RC30 is factory-preset. You can adjust these settings, such as
the heating program for example, and match them to your
requirements.

Special functions help you to save energy, without sacrificing your
personal comfort.

Your heating system offers a wealth of other useful functions,
including automatic summer/winter changeover and a holiday
function.

Function modules (accessories)

These instructions also apply to the RC30 used in conjunction with
the mixer module MM10 and low loss header module WM10 (see
also page 9). These function modules are set up by your installer
and do not need to be modified.

This device meets all requirements of applicable standards and
guidelines.
Conformity has been verified. All associated documents and the
declaration of conformity are available from the manufacturer.

4 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

What you should know about your heating system 2

2 What you should know about your heating system

2.1 How does the RC30 work?

The RC30 ensures comfortable heat and economical consumption
of fuel and electricity. It switches the boiler and pumps ON if DHW
(domestic hot water) or a higher room temperature are required.

Modern heating control units calculate the temperature required
within the boiler (the so-called flow temperature) subject to the
outside temperature and the desired room temperature (set
temperature). The relationship between the outside temperature
and the flow temperature is described as the heating curve. The
lower the outside temperature, the higher the flow temperature
must be to achieve the required room temperature.

For example, if you increase the set room temperature by 2 °C, the
heating curve is raised in parallel. This increases the flow
temperature by around 6 Kelvin (one Kelvin corresponds to one
degree Celsius).

The gradient of the heating curve depends on the type of heating
system (e.g. radiators or underfloor heating). This will be
determined by your installer during the commissioning process.

2
1

Flow temperature in °C

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Operating instructions RC30 programmable room thermostat • Issue 02/2006

Outside temperature in °C

Fig. 1 Heating curve (example), before (1) and after (2) increasing the

set room temperature by 2 °C

5

What you should know about your heating system2

2.2 Control modes for the RC30

The RC30 can operate in three control modes:

– outside temperature dependent control

– room temperature control or

– outside temperature control with room temperature influence

Outside temperature dependent control

With outside temperature dependent control, only the outside
temperature measured by the outside temperature sensor is taken
into account for the flow temperature level. The advantage of
outside temperature dependent control is that the overall heat
requirement of the house is considered, rather than the
temperature in a single reference room where the thermostat is
located. Room temperature fluctuations through solar gain,
occupants, open fireplaces or similar external heat sources are
then ignored.

If you use this type of control, adjust the thermostatic radiator
valves so that the required room temperature is obtained in each
room.

Room temperature control*)

A further possible RC30 method is room temperature control. The
RC30 calculates the temperature required inside the boiler or the
output required from the boiler, subject to the set and the actual
room temperature.

To be able to utilise the room temperature control, you require a
room which is representative of your whole home. All factors
influencing the temperature in this "reference room" – in which the
RC30 is located – will also apply to all other rooms. Not every
home has a room which meets these requirements. A pure room
temperature control has, in such cases, certain limitations.

Should you, for example, open a window in the room where the
room temperature is measured, the control unit will "think" that you
have opened the windows in all rooms in your home and will begin
to heat more vigorously.

*) Please note that the RC30 has to be located in the reference room and not in the boiler for this

6 Operating instructions RC30 programmable room thermostat • Issue 02/2006

option

We reserve the right to make any changes due to technical modifications.

What you should know about your heating system 2

Or conversely: You measure the temperature in a south-facing
room with different heat sources (solar or other heating sources,
e.g. an open fireplace). Now the control unit "thinks" that it is as hot
in all rooms as in the reference room; consequently the boiler
output will be severely cut back so that, for example, the north­facing rooms are too cold.

With this kind of control you will need to keep all thermostatic
radiator valves in the reference room fully open.

Outside temperature dependent control with room
temperature influence *)

The outside temperature dependent control with room temperature
influence combines the advantages of both above control modes.
The required flow temperature, which is mainly subject to the
outside temperature, can be adjusted by the room temperature
only to a limited degree. This achieves an improved maintenance
of the room temperature within the room containing the RC30,
without fully ignoring the other rooms.

With this kind of control you will also need to keep all thermostatic
radiator valves in the reference room fully open.

2.3 Why do the thermostatic radiator valves have to stay fully open?

For example, if you want to reduce the room temperature in the
reference room and you close the thermostatic valve, the flow rate
through the radiator will be reduced and, therefore, less heat is
transferred to the room. This reduces the room temperature. The
RC30 unit will endeavour to counteract the falling room
temperature by raising the flow temperature. However, raising the
flow temperature will not raise the room temperature, as the
thermostatic valve continues to limit the room temperature.

A flow temperature which is too high results in unnecessary heat
losses in boiler and pipework. At the same time, the temperature
in all other rooms without thermostatic valves increases due to the
higher boiler water temperature.

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

*) Please note that the RC30 has to be located in the reference room and not in the boiler for this

option

7

What you should know about your heating system2

2.4 Why do I need a heating program?

Unlike standard controls, the RC30 offers more choice than just
ON/OFF. Modern heating systems offer a choice of heating
programs. A heating program sets the times at which the system
automatically switches between two different room temperatures.
The first setting, called „day mode“, is for when the building is
actively occupied and a higher temperature is required. The
second setting, called „night mode“ is not just for the night but for
any time when you want to maintain a lower temperature i. e. when
the building is unoccupied or when everyone is in bed at night. This
enables you to set a reduced room temperature at night or at other
times when a reduced temperature is sufficient (also known as
"night setback"). You can save a lot of energy by choosing a
heating program to match your lifestyle.

The RC30 offers four options on "night mode" for reducing the
room temperature. Your installer will select and set up one of these
options according to your requirements:

– "OUTSIDE STOP" (also possible without remote control,

outside sensor required)
"Outside stop" switches the heating circuit according to the
outside temperature and the set frost protection temperature
(see Chapter 5.8.10 "Frost protection", page 39).
Above the frost protection temperature the heating circuit is
switched off. Below this temperature the system heats to the
set night mode temperature.

– - "ROOM STOP" (only possible with RC30 in reference room)

"Room stop" switches the heating circuit according to the room
temperature.
Above the set room temperature the heating circuit is switched
off. Below the set room temperature the system heats to the set
night mode temperature. This function requires the RC30 to be
located in the reference room.

– "STANDBY" (also possible without remote control)

Here the heating circuit is simply turned off in night mode. You
must activate frost protection monitoring (see Chapter 5.8.9
"Frost protection type", page 38).

8 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

What you should know about your heating system 2

- "REDUCED" (also possible without remote control)
Here the system heats to the set night temperature in setback
heating mode.
The heating circuit pumps operate constantly.

The heating program is only switched on in automatic mode; night
setback is not available in manual mode.

2.5 What are heating circuits?

A heating circuit describes the circuit taken by the heating water
from the boiler via the radiators and back to the boiler (Fig. 1 on
page 5). Several heating circuits may be connected to one boiler,
for example one heating circuit for supplying radiators and a further
heating circuit for supplying an underfloor heating system. In this
case, the radiators are supplied at a higher flow temperature than
the underfloor heating system.

With the RC30 you can operate and control the two heating circuits
independently (Fig. 2, Item 1). If the second heating circuit is used
to supply a separate flat or area of the building, a separate room
controller RC20 can also be installed (Fig. 2, Item 2). This allows
you to operate the second heating circuit as an "independent"
system.

12

RC20

RC30

Fig. 2 Heating system with two heating circuits. One RC30 for both

heating circuits (1) or RC30 plus RC20 as a remote control for
the second heating circuit (2).

RC30

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

9

What you should know about your heating system2

Mixer module MM10

The supply of different flow temperatures to different heating
circuits in a heating system can only be achieved if a three-way
mixing valve is installed between the boiler and the second heating
circuit. This valve is controlled by the mixer module MM10
(accessory). Using an additional temperature sensor in the flow of
the heating circuit to be supplied, sufficient cold return water is
added to the hot flow water via the three-way mixing valve to
achieve the required lower temperature.

Low loss header module WM10

It is important to note that heating circuits with three-way mixing
valves require an additional pump. This pump enables the second
heating circuit to be operated independently of the first heating
circuit. A low loss header can be used for this hydraulic decoupling
between the boiler and heating circuit. This is controlled by the
function module WM10. The WM10 can also be used for DHW
heating via a cylinder loading pump.

10 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

Tips on economical heating 3

3 Tips on economical heating

Here are a few tips on how to heat economically, without sacrificing
comfort, using your RC30:

z Only heat if you need warmth. Use the heating programs preset

in the RC30 or those which you have tailored to your personal
needs.

z Ventilate correctly during the cold season: Open the windows

wide three to four times per day for approx. five minutes.
Having the window slightly open all the time does not provide
fresh air changes and wastes valuable energy.

z Close the thermostatic radiator valves when the room is being

ventilated.

z Windows and doors are places where a lot of heat is lost. So

check that the doors and windows are correctly sealed. At
night, close your shutters and blinds (if installed).

z Heat in an energy-conscious manner during in spring and

autumn, and make use of the summer/winter changeover
function (see Chapter 9.10 "Setting summer/winter
changeover", page 72). In summer mode the heating is
switched off and only DHW is heated. In winter mode the
heating and DHW are activated.

z Never position large objects such as a sofa or a desk

immediately in front of the radiators (maintain a clearance of at
least 50 cm). Otherwise the heated air cannot circulate and
heat the room adequately.

z In those rooms which you occupy during the day, you can set

a room temperature of 21 °C, for example, whilst 17 °C may be
sufficient at night. You can do this using day and night modes
(see Chapter 7 "Basic functions", page 20).

z Never overheat rooms. Overheated rooms are unhealthy and

cost energy and money. If you reduce the daytime room
temperature, from 21 °C to 20 °C, for example, you will save
around six percent on your heating bill.

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

11

Tips on economical heating3

z A comfortable room climate depends not only on the room

temperature but also on the relative humidity. The drier a room,
the cooler it feels. You can improve the relative humidity with
houseplants.

z You can also save energy when heating DHW by running the

circulation pump in intermittent mode only. Research has
shown that it is generally sufficient to run the DHW circulation
pump for three minutes in every 30.

z Arrange with your installer to service your heating system

annually.

12 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

For your safety 4

4 For your safety

The RC30 has been designed and built in accordance with
currently recognised standards and safety requirements.
However, dangers or material losses may arise if it is used
improperly.

z You should therefore only operate the heating system as

intended and when it is in perfect working order.

z Please read these instructions carefully.

z Always observe the safety instructions to prevent injury and

material losses.

4.1 Correct use

The RC30 must only be used to operate and control Buderus
heating systems with EMS (Energy Management System).

4.2 Please observe these notes

USER NOTE

z In an emergency isolate the heating system from the mains

supply using the emergency stop switch outside the boiler
room or by removing the main fuse.

z Call in your installer to remedy all faults in your heating system

immediately.

SYSTEM DAMAGE

through frost.

CAUTION!

The heating system can freeze up in cold weather if it has been
switched off.

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Operating instructions RC30 programmable room thermostat • Issue 02/2006

z Leave the heating system switched ON constantly.

z In case of fault shutdown, try to remedy the fault by resetting

or notify your installer.

13

For your safety4

4.3 Cleaning

4.4 Disposal

4.5 Other notes

z The RC30 should only be cleaned with a damp cloth.

z Dispose of packaging in an environmentally responsible

manner.

z Dispose of old components in an environmentally responsible

manner.

Assembly, maintenance and repairs, as well as fault diagnosis,
must only be carried out by installers.

USER NOTE

All changes and adjustments carried out on the RC30 must
correspond to the heating system requirements.

Never open the housing of the RC30.

14 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

First steps with your RC30

5 First steps with your RC30

5.1 Controls

1

5

2

3

4

5

Fig. 3 Controls on the RC30

Item 1: Temperature, percentage and summer mode display

Item 2: Buttons for basic functions with LEDs

Item 3: Dial for changing values and temperatures or for navigating

through the menus

Item 4: Buttons for extended functions and special functions

Item 5: Hinged flap covering the buttons for extended functions and

special functions

Buttons for basic functions
(Fig. 3, Item 2)

"AUT" button (Automatic) "Display" button

"Day mode" button (normal
heating mode)

"Night mode" button
(reduced heating mode)

"DHW" button "Prog" button (Program)

Buttons for extended functions
(Fig. 3, Item 4)

"Time" button

"Weekday" button (Day / Date)

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Operating instructions RC30 programmable room thermostat • Issue 02/2006

"Heating circuit" button

"Back" button

15

5

First steps with your RC30

ACTUAL
ROOM TEMP

21.5

°

Display (Fig. 3, Item 1)

As soon as you press a button or move the dial, the display shows
the selected value (set value). After about 2 seconds the standard
display is restored.

The standard display shows the actual room temperature. This is
the factory setting. You can also choose a different standard
display (see Chapter 8.19 "Changing the standard display",
page 55).

LEDs (Fig. 3, Item 2)

The green LEDs provide information about the current operating
status:

LED Operating status

The LED lights up when automatic mode (heating
program) is active. In addition, the "Day mode" or "Night

"AUT"

mode" LED is illuminated.
If the holiday function is active, only the "AUT" button
LED is illuminated.

"Day
mode"

"Night
mode"

"DHW"

Tab. 1 Operating status

Flap (Fig. 3, Item 5)

To open the flap, take hold of the recessed grip on the left-hand
side and pull the flap towards you. Opening the flap activates a
switch allowing you to use the extended functions and special
functions.

The LED lights up in normal heating mode (day mode).

The LED lights up in reduced heating mode (night
mode).

The LED lights up if the DHW temperature falls below
the set value.

The LED is off if the DHW temperature is within the
desired temperature range or if there is no DHW heating
function installed in the EMS.

The LED flashes when hot water is being heated by
means of the "DHW single loading" function.

16 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

First steps with your RC30

5.2 Quick reference guide

For funktions press and hold button, turn dail to select value, release button.

Setting temperatures (Basic functions, Chapter 7, page 20)

5

Buttons Function

+

+

Flap closed

+

Extended functions (Chapter 8, page 30)

Buttons Function Page

+

+

Factory

setting

Temperature for
day mode

Temperature for
night mode

DHW temperature 60 °C 30 – 60(80) °C

Return to Automatic mode after changing the day or night
temperature

Changing the standard display page 55

Setting the time page 34

21 °C 11 – 30 °C

17 °C 10 – 29 °C

Setting

Range System

+

Flap open

+

+

We reserve the right to make any changes due to technical modifications.

Setting the date page 33

Selecting a heating program page 39

Select: heating circuit, DHW, solar page 35

Back to previous level (menu), settings are retained

Operating instructions RC30 programmable room thermostat • Issue 02/2006

17

5

First steps with your RC30

Additional menu (Chapter 9, page 56)

Buttons Menu Menu

+

Press the "Time" and "weekday"
buttons at the same time to open

the additional menu.

+

5.3 Switching on and off

The RC30 is powered by the heating system and is permanently
switched on. It is only switched off if the heating system is switched
off, e.g. for maintenance purposes.

The power consumption is designed for this constant operation
and at 0.3 W is very low (0.6 W with background lighting).

To switch the heating system on or off, set the ON/OFF switch on
the base controller (Fig. 4, Item 1) to position "1" (ON) or "0"
(OFF).

HOLIDAY THERM DISINF

BNK HOLIDAY STD DISPLAY

CALIBRATION KEY LOCK

PARTY SU/WI CHANGE

PAUSE SU/WI TIME

Fig. 4 Base controller BC10

Item 1: ON/OFF switch on base controller

USER NOTE

The settings in the RC30 are retained for approximately 10 hours
in the event of a power cut (or system shutdown).

18 Operating instructions RC30 programmable room thermostat • Issue 02/2006

1

We reserve the right to make any changes due to technical modifications.

Language 6

6 Language

You can choose the language in which messages on the RC30 are
displayed.

Proceed as follows:

z Open the flap (by pulling the recessed grip on the left).

Simultaneously press the "Display", "Heating circuit" and "Back"
buttons.

SERVICE MENU

LANGUAGE

LANGUAGE

ENGLISH

The main service level menu is displayed, indicated by "SERVICE
MENU".

Press the "Display" button to select "SERVICE MENU
LANGUAGE".

Hold down the "Display" button and select the required language
with the dial.

The selected language is displayed.

Release the "Display" button. The language selection is saved.

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

All messages will now be displayed in the chosen language.

z Press the "Back" button twice or close the flap to return to the

standard display.

19

Basic functions7

7 Basic functions

This chapter describes how to change room and DHW
temperatures, the advantages of automatic mode, how to make
effective use of manual mode, etc.

The basic functions are controlled by pressing and holding a button
on the right-hand side of the RC30 and turning the dial.

7.1 Changing the room temperature directly

If it is too cold in the house in general, increase the room
temperature on the RC30 and leave the thermostatic radiator
valves unaltered.

Set the required room temperature by turning the dial. (Note: To do
this the RC30 flap must be closed.)

USER NOTE

If your heating system has several heating circuits, you must
select the correct heating circuit first (see Chapter 8.6 "Selecting
a heating circuit", page 35). Only then can you set the room
temperature.

7.2 Selecting the operating mode

You can operate the RC30 in two ways:

– in automatic mode

– in manual mode

20 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

Basic functions 7

7.2.1 Selecting automatic mode

Generally, buildings are heated less at night than during the day.
In automatic mode the RC30 changes over automatically between
day mode (standard heating mode) and night mode (reduced
heating mode). This means that you do not have to adjust the
thermostatic radiator valves every morning and evening.

The times at which the heating system changes from day to night
mode – and vice versa – are factory-set via the heating program.
However, you or your installer can modify this setting (see Chapter

8.9 "Selecting a preset heating program", page 40).

The heating program raises or lowers the room temperature at
fixed times. The time at which the system changes from night to
day mode (and vice versa) is known as the "switching point".

HEAT CIRC 1
AUTO DAY

21.0

°

Day "Normal" mode

Night "Reduced"
mode

Fig. 5 Changeover between day and night mode at fixed times

Example: Activating automatic mode

Press "AUT".

The LED in the "AUT" button lights up; automatic mode is active.

In addition, either the "Day mode" or the "Night mode" LED is
illuminated. This depends on the set times for day and night mode
(see Chapter 2.4 "Why do I need a heating program?", page 8).

Depending on which heating circuit you have selected, "HEAT
CIRC 2" or "RC30 HEATCIR" may be displayed instead of "HEAT
CIRC 1" (see Chapter 8.6 "Selecting a heating circuit", page 35).

5:30

21 °C

17 °C

22:00

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

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Basic functions7

USER NOTE

During spring and autumn, you may find that your home feels too
cold, even though the heating system is in summer mode (DHW
heating only) because of the outside temperature. In such a case
choose manual mode to run the heating. The heating is then
permanently on and must be turned off by pushing the
"AUT" button.

You can also change the setting for automatic summer/winter
changeover (see Chapter 9.10 "Setting summer/winter
changeover", page 72).

22 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

Basic functions 7

7.2.2 Selecting manual mode

For example, if you want the heating to run for longer in the
evening or earlier in the morning, you can also select the day and
night mode manually. There are two temperatures for manual day
and night mode. You can use manual day mode to run the heating
on cooler days,when the system is operating in summer mode.

Press the "Day mode" button to switch to manual mode.

HEAT CIRC 1
MAN DAY

21.0

HEAT CIRC 1
MAN NIGHT

17.0

°

°

The LED in the "Day mode" button lights up. Now your heating
system is set in constant day mode (standard heating mode).

You can set the room temperature using the dial.

Press the "Night mode" button to switch to manual mode.

The LED in the "Night mode" button lights up. Now your heating
system is set in constant night mode (setback heating mode), and
operates at a lower room temperature.

USER NOTE

If you have selected manual mode, other automatic functions will
also be switched off, such as the heating program (i.e. no night
setback of the room temperature) or summer/winter changeover.

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

USER NOTE

To return to automatic mode, press "AUT".

23

Basic functions7

7.3 Setting the room temperature

The room temperature applies to the currently active heating
mode, i.e. day or night mode. The currently active heating mode is
indicated by an illuminated green LED.

7.3.1 Setting the room temperature for the current operating
mode

Condition: The RC30 flap is closed.
You are currently in automatic "Day" mode and would like to alter
the room temperature.

Set the required room temperature by turning the dial. Turning the
dial clockwise increases the value, turning anti-clockwise reduces
the value.

SET
ROOM TEMP

21.0

°

The newly selected room temperature will be saved after approx.
2 seconds. Then the selected standard display will be shown
again.

To adjust the room temperature with the flap open, you must press
either the "Day mode" or "Night mode" button whilst turning the
dial.

USER NOTE

Changing the set room temperature moves the heating curve up
or down in parallel (see "How does the RC30 work?", page 5).

USER NOTE

Any adjustment applies to all heating circuits allocated to the
RC30 (see Chapter 8.7 "Changing settings for another heating
circuit", page 37).

24 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

Basic functions 7

7.3.2 Setting the room temperature for an operating mode
that is currently inactive

You can also adjust the room temperature for an operating mode
that is currently inactive.

For example, you are currently in automatic "Day" mode and would
like to alter the night setback temperature.

+

HEAT CIRC 1
MAN NIGHT

17.0

°

Hold down the "Night mode" button and at the same time select the
required room temperature with the dial.

Release the "Night mode" button. The newly selected room
temperature will be saved after approx. 2 seconds. Then the
standard display will be shown again.

Press "AUT".

The LED in the "AUT" button lights up; automatic mode is active
again.

USER NOTE

If you are currently in automatic "Night mode" and you wish to
adjust the day mode, proceed as described above, but instead
hold down the "Day mode" button.

MAN NIGHT

OFF

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

"OFF" message

If your installer has selected "Shutdown" as the setback type, a
room temperature cannot be set for night mode (see "Why do I
need a heating program?", page 8).

25

Basic functions7

7.4 Heating domestic hot water

The RC30 also allows you to heat the DHW in an energy­conscious manner. With the factory setting, DHW heating begins
automatically 30 minutes before day mode starts the first heating
circuit, and ends when the last circuit switches to night mode (see
Fig. 6).

Outside the times set in the heating program, DHW heating is
switched off, i.e. no DHW is heated in night mode.

Heating circuit 1

Day "normal" mode

Night "reduced"
mode

Heating circuit 2

Day "normal" mode

Night "reduced"
mode

DHW

Day "normal"
mode

Night "reduced"
mode

Fig. 6 DHW heating according to the heating circuits

6:30 23:00

6:00

-0:30

5:30

22:00

23:00

The DHW temperature for day mode is factory-set to 60 °C. The
DHW cylinder is loaded once in the morning before the start of
heating and is only reloaded if the DHW temperature falls 5 °C
below the set value (to conserve energy).

USER NOTE

If the green LED in the "DHW" button lights up, the DHW
temperature has fallen below the set value.

26 Operating instructions RC30 programmable room thermostat • Issue 02/2006

We reserve the right to make any changes due to technical modifications.

Basic functions 7

USER NOTE

In a modern Buderus DHW cylinder, the water only cools down at
a rate of around 0.5 °C per hour when not being drawn, i.e.
reloading only occurs after 10 hours. If necessary you can
manually reload the DHW to 60 °C (see Chapter 7.4.2 "Single
DHW loading", page 28).

If you regularly need large amounts of hot water in the evening, you
can also set up a separate DHW program (see Chapter 8.16
"Entering a DHW program", page 51).

7.4.1 Setting the DHW temperature

RISK OF SCALDING

SET
DHW TEMP

SET
DHW TEMP

BLOCK

WARNING!

+

60

°

The factory-set DHW temperature is 60 °C. There is a risk of
scalding at the taps if the temperature is set to above 60 °C.

z If the DHW temperature is set to above 60 °C, you should only

draw off mixed hot and cold water.

You can check or change the DHW temperature setting:

Hold down the "DHW" button and select the required DHW
temperature with the dial (max. 80 °C).

Release the "DHW" button. The new DHW temperature setting is
saved immediately. Then the standard display is shown again.

"BLOCK" message

If the display reads "SET DHW TEMP – BLOCK", the DHW
temperature can only be changed via the boiler and not via the
RC30.

z Check the setting on the BC10 boiler base controller. Select the

setting "Aut" using the dial for the DHW temperature.

We reserve the right to make any changes due to technical modifications.

Operating instructions RC30 programmable room thermostat • Issue 02/2006

27