Bosch CR 50 User manual

6720856749 (2016/03)
Installation instructions for contractors
User interface
CR50
6 720 809 984-00.1O
EMS 2

6720856749 (2016/03) CR50
2 | Key to symbols and safety instructions
1 Key to symbols and safety instructions
1.1 Explanation of symbols
Warning symbols
Keywords at the start of a warning indicate the type and
seriousness of the ensuing risk if measures to prevent the risk
are not taken.
The following keywords are defined and can be used in this
document:
DANGER:
DANGER indicates a situation that will result in severe injury or
death.
WARNING:
WARNING indicates a situation that could result in severe
injury or death.
CAUTION:
CAUTION indicates a situation that could result in minor to
medium injury.
NOTICE:
NOTICE indicates a situation that could result in damage to
property or equipment.
Important information
The info symbol indicates important information where there is
no risk to people or property.
1.2 General safety instructions
HNotice for the target group
These installation instructions are intended for plumbers,
heating engineers and electricians. All instructions must be
observed. Failure to comply with instructions may result in
material damage and personal injury, including possible loss of
life.
▶ Read the installation instructions (heat source, heating
controller, etc.) before installation.
▶ Observe the safety instructions and warnings.
▶ Observe national and regional regulations, technical rules
and guidelines.
HDetermined use
▶ Only use the product to control solar heating systems in
single-family homes or apartment buildings.
Any other use is considered inappropriate. We take no
responsibility for damage caused through incorrect use.
HElectrical work
Electrical work must only be carried out by a qualified
electrician.
▶ Before starting electrical work:
– Isolate the mains electrical supply and secure against
reconnection.
– Using suitable means, test that the mains voltage is
disconnected.
▶ Never connect the product to mains voltage.
▶ Also observe the connection diagrams of other system
components.
2 Product information
The CR 50 user interface is a control unit without an outdoor
temperature sensor.
Informationonenergyefficiency(ErPDirective)canbe foundin
the operating instructions.
2.1 Product description
The user interface is used to control a heating circuit without
mixerandaDHWtankchargingcircuitforwaterheatingdirectly
at the heat source.
The user interface is not suitable for connecting the DHW
cylinder behind a low loss header.
The user interface is installed in a suitable living space.
Fig. 1 Example of a heating system with one heating zone
and a CR50 as controller (single-family home)
CR 50
0010008714-001

6720856749 (2016/03)CR50
Installation | 3
2.2 Scope of delivery
Fig. 2 Scope of delivery
[1] User interface
[2] Technical documentation
2.3 Technical data
Fig. 3 Dimensions in mm
Table 1 Technical data
2.4 Temperature sensor characteristics
Table 2 Resistance values for flow and hot water
temperature sensors
2.5 Applicability of the technical documentation
Information in the technical documentation about heat
sources, heating controllers or the BUS apply also to the
present user interface.
2.6 Additional accessories
No other BUS modules and user interfaces are possible in the
system with the CR 50.
Combination is not possible with the following products:
• FR..., FW..., TR..., TF..., TA...
3 Installation
DANGER:
Life-threatening danger from electrical shock!
▶ Before installing this product:
Disconnect the heat source and all other BUS nodes from
the mains voltage across all poles.
3.1 Installation location
This user interface is intended only for wall-mounted
installation.
Do not install in the heat source or in wet areas.
Rated voltage 8 ... 16 V DC (2-wire BUS/EMS 2
and OpenTherm)
Rated current 5 ... 23 mA(2-wireBUS/EMS 2and
OpenTherm)
BUS interface 2-wire BUS, EMS 2, OpenTherm
Control range 5 ... 30 °C
permissible ambient
temperature
0 °C ... 50 °C
Power reserve t4 h
Protection class III
IP-Rating IP20
0010008715-001
B
U
S
B
U
S
i
i
1
2
6 720 809 984-08.1O
95
25
33
95
°C : °C : °C : °C :
8 25065 32 9043 56 3723 80 1704
14 19170 38 7174 62 3032 86 1421
20 14772 44 5730 68 2488 – –
26 11500 50 4608 74 2053 – –

6720856749 (2016/03) CR50
4 | Installation
Fig. 4 Installation location in the reference room
3.2 Installation
Fig. 5 Installation of the plinth
3.3 Electrical connection
Power is supplied to the user interface via the BUS cable. The
wires are insensitive to polarity.
If the maximum total length of the BUS interfaces between all
BUS nodes is exceeded or the BUS system has a ring structure,
commissioning of the system is not possible.
Maximum total length of BUS interfaces:
• 50 m at 0.50 mm2conductor cross-section
• 300 m at 1.50 mm2conductor cross-section.
▶ To avoid inductive interference: Make sure all low-voltage
cables are routed separately from mains voltage cables
(min. clearance 100 mm).
6 720 809 984-03.1O
≥ 1000
≥ 1200
750
600
0 010 003 263-002
6 mm 3,5 mm6 mm
3,5 mm

6720856749 (2016/03)CR50
Commissioning | 5
▶ In the case of external inductive interferences (e.g. from
photovoltaic systems), use shielded cables (e.g. LIYCY)
and earth the shield on one side. Connect the shield to the
building's earthing system, such as to a free earth
conductor terminal or water pipe.
▶ Establish a BUS connection to the heat source.
Fig. 6 Connection of the user interface to a heat source
1) Terminal identification:
On heat sources with an OpenThermBUS system: OT
On heat sources with a BUS system EMS 2 ABBAS
On heat sources with a 2-wire BUS: BB
3.4 Hooking in or removing the user interface
Fitting the user interface
1. Hook in the user interface at the top.
2. Click in the user interface at the bottom.
Fig. 7 Fitting the user interface
Removing the user interface
1. Press the button on the underside of the plinth.
2. Pull the bottom of the user interface away from the plate.
3. Remove the user interface by lifting upward.
Fig. 8 Removing the user interface
4 Commissioning
▶ First make all electrical connections and then carry out
commissioning.
▶ Follow all installation instructions for all components and
assemblies in the system.
▶ Turn on the mains power supply.
▶ Set the heat source to the maximum flow temperature
needed and activate the automatic operation for water
heating.
Once the user interface is connected to the power supply,
the language selection appears on the display.
▶ Make adjustments by turning and pressing the selector.
▶ Set the language.
The display switches to the date setting.
BUS
0010008722-001
BUS/
BB/OT
1)
6 720 809 984-06.1O
1. 1.
2.
6 720 809 984-07.1O
3.
1. 2.
0010005965-001
english
english

6720856749 (2016/03) CR50
6 | Shutdown / switching off
▶ Set the date.
The display switches to the time setting.
▶ Set the time.
The CR 50 is now set up as a controller and the display
automatically changes to the standard display. The heating
system and DHW heating are operating (continuous hot
water, heating according to the heating program).
The manual adaptation to the individual heating system can be
performed in the service menu.
▶ Make the corresponding system settings, such as Control
type, Max. Suppl.T., PID charact., Opt. pump run, Frost
protect, Max. DHW temp
5 Shutdown / switching off
The user interface is powered via the BUS interface and is
always switched on. The system should only be switched off for
maintenance work, for example.
▶ Disconnect power from the entire system and all BUS
nodes.
After a prolonged power failure or extended period of idleness,
the date and time may need to be reset. All other settings are
retained permanently.
6 Service menu
▶ If the standard display is active, press and hold the menu
key for about three seconds until the service menu appears
in the main menu is displayed.
▶ Pressthe selector toopenthe highlightedservicemenu .
▶ Turn the selector to select a menu item or change the value
of a setting.
▶ Press the selector to open the selected menu item, activate
the input field for a setting or confirm a setting.
Depending on the control device for the heat source and BUS
system employed, some menu items are displayed and cannot
be adjusted using the user interface.
Service menu overview ÆPage 10.
6.1 System data menu
In this menu, monitor and individually reconfigure the entire
system with respect to the automatic settings.
0010005966-001
20.07.2011
20.07.2011
0010005967-001
Time of day
Time of day
0010008811-001
12:38
12:38
We
We
auto
auto
Menu item Control range: Function description
User interf. Controller: Use as a controller
HC assignment 1
Pump conn. Heat sources: Heating pump connected to
heat source
Heat. System High Temp | Low Temp.: Assign the heating
system to the heating circuit
Control type Room supply | Room output: Choose
the room control as either a flow
temperature control or output
control (outputcontrolonly available with 2-
wire BUS/EMS 2-BUS).
Config. HC1 Hydraulic and electrical connection of
heating circuit 1 to heat source (only with
the EMS 2)
Ownpump:Heatingcircuitpumpelectrically
connected to the heat source
P. after header: Low-loss header installed,
heating circuit pump connected to heat
source
DHW No: No DHW system installed
Yes, 3-wy vlv: Existing hot water system is
supplied via 3-way valve
Yes, pr. pump: Existing hot water system is
supplied via cylinder primary pump
LLH sensor No: No low-loss header installed
Yes, on appl.: Low-loss header installed,
temperature sensor connected to heat
source

6720856749 (2016/03)CR50
Service menu | 7
Table 3 Settings in the system data menu
6.2 Heating circuit menu
Settings for the heating zone are made in this menu.
NOTICE:
Risk of damaging or destroying the screed!
▶ If an underfloor heating system is installed, observe the
maximum flow temperature recommended by the
manufacturer.
Table 4 Settings in the heating zone menu
Frost protection
The setting by room temp offers sufficient frost protection
only if all the piping in the insulated building envelope is run in
the “warm area” (no reliable frost protection if the piping is run
in façades, for example).
6.3 DHW menu
Settings for water heating are made in this menu. A contractor
can set a hot water temperature higher than 60 °C. Only
available with EMS 2-BUS.
WARNING:
Risk of scalding from hot water!
If thermal disinfection has been set to avoid legionella (the
DHW is heated once Thursday night at 02:00 to 70 °C), or the
maximum storage temperature has been set to above 60 °C:
▶ Inform all people concerned and make sure that a mixer is
installed.
Table 5 Settings in the hot water menu
6.4 Function test menu
The system pump can be tested using this menu.
Table 6 Settings in the function test menu
6.5 Info menu
Heating system settings and measurements are displayed in
this menu. Changes are not possible.
Recirculation NO: The DHW circulation pump cannot be
controlled by the heat source.
YES: The DHW circulation pump can be
controlled by the heat source.
Reset all NO: The current settings have been
retained.
YES: The factory settings are being restored
(except time and date).
Menu item Control range: Function description
Max. Suppl.T. 30 ... 48 ... 60 °C (example of underfloor
heating system): Maximum flow temperature
PID charact. Fast: Fast control characteristic, such as
when there is a small heating water quantity
in the air heating
Medium: Medium control characteristics, for
example with radiator heating
Slow: Slow control characteristics, for
example with underfloor heating system
Opt. pump run ON: The heating pump runs as little as
possible on the basis of the flow temperature
OFF If the system has more than one heat
source installed or a buffer cylinder is
installed, this function must be deactivated.
Frost protect
(only available
with 2-wire
BUS/EMS 2-
BUS)
OFF: Frost protection off
by room temp: Frost protection is
deactivated/activated on the basis of the
temperature selected here
DHW priority ON: DHW heating is activated, the heating is
interrupted
OFF: DHW heating is activated, parallel
operation with heating
Menu item Control range: Function description
Menu item Control range: Function description
Max. DHW
temp
60 ... 80 °C: The set value is the upper limit for
the desired hot water temperature
Menu item Control range: Function description
Activation NO: All actuators return to the same position
as before activating the test.
YES: All actuators in the system switch to the
test mode.
System pump 0(in%):Heatingpumpnot running(switched
off).
100 (in %): Heating pump running at
maximum speed.
Menu item Possible values: Description
Appl. oper. ON: Burner in operation
Off: Burner not operating
Appl.set flow 20 ... 90 °C: Flow temperature required at
the heat source (set temperature)

6720856749 (2016/03) CR50
8 | Troubleshooting
Table 7 Information menu
6.6 Maintenance menu
Service-relevant settings are made in this menu, e. g. deleting
the list of faults after all faults have been rectified in the course
of service.
Table 8 Settings in the Maintenance menu
6.7 System info menu
Detailed information about the BUS nodes in the system can be
queried in this menu. Changes are not possible.
Table 9 System info
7 Troubleshooting
A fault appears on the display of the user interface. The cause
can be a fault on the user interface, in a component, in an
assembly or on the heat source. The service manual with
detailed fault descriptions contains additional information on
troubleshooting.
Structure of table headers:
Fault code - sub-code - [cause or fault description].
Appl.act.flow 20 ... 90 °C: Flow temperature measured at
the heat source (actual temperature)
Appl.max.flow 35 ... 90 °C: Maximum flow temperature set
at the heat source
LLT temp. 20 ... 90 °C: Current hot water temperature
in the low-loss header
HC operation OFF: No operation | Heating: Heating mode
active | Setback: Setback mode active |
Manual: Manual operation active
Current operating mode in heating zone.
HC set sply. 20 ... 90 °C: Required flow temperature in
heating zone
Set room temp OFF: Heating switched off, e. g. in the
summer
5.0 ... 30.0 °C: Desired room temperature
Room Temp. 5.0 ... 30.0 °C: Measured room
temperature
DHW operation ON: DHW heating active
OFF: Water heating not active
Set DHW temp 15 ... 80 °C: Desired DHW temperature
Act. DHW temp 15 ... 80 °C: Measured DHW temperature
Max. DHW
temp
15 ... 80 °C: Maximum hot water
temperature set on the user interface
Menu item Control range: Function description
Maint.message OFF: No service display appears on the user
interface.
ON: A service display appears on the display
of the user interface on the set date.
Maint. date 2012-01-01 – 2099-12-31: Date for next
heating system maintenance.
Reset maint. NO: The service display is not reset.
YES: The service display is reset.
Current fault such as 2012-09-29 A11/802: All current
faults are displayed, arranged in order of
faultseverity: the date isdisplayed, the fault
code and sub-code flash alternately in the
value display.
Menu item Possible values: Description
Fault history such as 2012-07-31 A02/816: The last 20
faults are displayed, arranged in order of the
time of occurrence. The date appears in the
text line, the fault code and sub-code flash
alternately.
Reset fault NO: The fault history is retained.
YES: The fault history is deleted.
Menu item Display example: Function description
Install.date 2012-09-14: Date of first commissioning as
a controller is automatically entered.
Control unit XXXX.X: Designation of the heat source
controls
Control SW 1.xx | 2.xx: Software version of the heat
source controls
SW controller NFxx.xx: Remote control software version
A01 - 808 - [DHW heating: hot water temperature sensor
1 faulty - replacement mode active]
Test procedure/cause Corrective measure
No hot water system installed Deactivate hot water system
in the service menu
Check connecting lead
between controller and hot
water temperature sensor
Ifthereisadefect, replacethe
sensor
Check the electrical
connection of the connecting
lead in the controller
If a screw or plug is loose,
rectify the contact problem
Menu item Control range: Function description

6720856749 (2016/03)CR50
Old electrical and electronic appliances | 9
Table 10
Table 11
Table 12
Table 13
Table 14
Table 15
Table 16
Table 17
Table 18
8 Old electrical and electronic appliances
Electrical or electronic devices that are no longer
serviceable mustbecollectedseparatelyand sent
for environmentally compatible recycling (in
accordance with the European Waste Electrical
and Electronic Equipment Directive).
To dispose of old electrical or electronic devices, you should
usethe returnand collectionsystemsputinplace in the country
concerned.
Check the hot water
temperature sensor
according to table
If values do not match,
replace the sensor
Check the voltage at the
connecting terminals of the
hotwater temperaturesensor
in the controller according to
table
If the sensor values matched,
but the voltage values do not
match, replace the controller
A01 - 810 - [hot water remains cold]
Test procedure/cause Corrective measure
If the DHW priority was
deselected and heating and
DHW are running in parallel,
the boiler's performance may
not be not sufficient
Set water heating to "priority"
Check the hot water
temperature sensor
according to table
Replacethesensorifthereare
deviations from the table
values
A11 - 1000 - [System configuration not confirmed]
Test procedure/cause Corrective measure
System configuration not
completed
Configure system completely
and confirm
A11 - 1010 - [No communication via BUS interface EMS 2]
Test procedure/cause Corrective measure
Check whether BUS cable
was connected incorrectly
Rectify wiring faults and
switch controller off and on
again
Check whether BUS cable is
defective. Turn the controller
off and on again.
• Repair or replace the bus
cable
• Replace defective user
interface
A11 - 1038 - [Invalid time/date]
Test procedure/cause Corrective measure
Date/time not yet set Set date/time
Prolonged loss of power supply Set date/time
A01 - 808 - [DHW heating: hot water temperature sensor
1 faulty - replacement mode active]
Test procedure/cause Corrective measure
A31 - 3021 - [Heating circuit flow temperature sensor
faulty - standby mode active]
Test procedure/cause Corrective measure
Check configuration. The
selected setting requires a
flow temperature sensor
Change configuration
Check flow temperature
sensor according to table
If values do not match,
replace the sensor
A61 - 1010 - [No communication via BUS interface EMS 2]
Test procedure/cause Corrective measure
CheckwhetherBUScablewas
connected incorrectly
Rectify wiring faults and
switch controller off and on
again
Check whether BUS cable is
defective. Turn the controller
off and on again.
• Repair or replace the bus
cable
• Replace defective user
interface
A61 - 3091 - [Room temperature sensor faulty]
Test procedure/cause Corrective measure
User interface faulty • Restart auto-
configuration. All users
must be on the BUS.
• Replace user interface
Hxx - ... - [...]
Test procedure/cause Corrective measure
For instance, service interval
of heat source elapsed.
Service required; see
documents for the heat
source.

6720856749 (2016/03) CR50
10 | Overview of the service menu
9 Overview of the service menu
The menu items are displayed in the sequence below.
Service
System Data
– User interf. (as a controller)
– HC assignment (HK1)
– Pump conn. (pump connection to the heat source)
– Heat. System
– Control type
– Ext.RoomSens. (external room temperature sensor)
– Config. HC11) (Configuration of heating circuit 1)
– DHW
– LLH sensor (low loss header)
– Recirculation (DHW circulation pump)
– Reset all (restoration of default setting)
Heat.circuit
– Max. Suppl.T. (maximum flow temperature)
– PID charact.
– Opt. pump run (optimum heating circuit pump operation)
– Frost protect2)
– DHW priority (DHW heating prioritized)
DHW
– Max. DHW temp1) (maximum DHW temperature)
Function test
– Activation
– System pump
Info
– Appl. oper. (burner in operation)
– Appl.set flow (required flow temperature)
– Appl.act.flow (measured flow temperature)
– Appl.max.flow (maximum flow temperature)
– LLT temp. (low loss header temperature)
– HC operation (heating circuit operation)
– HC set sply. (required flow temperature in heating zone)
– Set room temp (desired room temperature)
– Room Temp. (measured room temperature)
– DHW operation (DHW heating operation)
– Set DHW temp (desired DHW temperature)
– Act. DHW temp (measured DHW temperature)
– Max. DHW temp (maximum DHW temperature)
Maintenance
– Maint.message (maintenance message)
– Maint. date
– Reset maint. (reset the service display)
– Current fault (active faults)
– Fault history (of the last 20 faults)
– Reset fault (reset fault history)
System info
– Install.date (date of installation)
– Control unit
– Control SW (software version of the control device)
– SW controller (programming unit software version)
1) Available only when using heat sources with EMS 2.
2) Only available with 2-wire BUS/EMS 2-BUS.

Middle East and Caucasian Area
Bosch Termoteknik Isıtma ve Klima Ticaret A.S.
Aydınevler Mah. İnönü Cad. No:20
Küçükyalı Ofispark A Blok
34854 Küçükyalı / Maltepe - İSTANBUL
Tel: [phone]
Products manufactured by
Bosch Thermotechnik GmbH
Junkersstrasse 20-24
D-73249 Wernau
www.bosch-thermotechnology.com