Bosch Radiator thermostat II Operator's manual

Radiator thermostat II
quick instructions
Product description
The intelligent radiator thermostat controls the
valve on the radiator in order to offer you greater
convenience for temperature control.
Description of the symbols
Caution!
Note about hazards
Note:
Additional important information
Note about the installation video
Safety instructions
▶ Do not charge used batteries, and do not at-
tempt to reactivate them using heat or other
means. Do not short-circuit batteries. Do not
throw batteries into fire!
There is a risk of explosion!There is a risk of explosion!
8-750-002-337

▶ Make sure the polarity is correct when in-
serting the batteries! Only use batteries of
the same type. Drained batteries must be re-
moved from the device immediately. Remove
batteries from the device if it is not used for a
longer period of time.
Increased risk of leakage!Increased risk of leakage!
▶ The device is not a toy! Do not allow children to
play with it. Never leave the packaging material
lying around unattended. Plastic film and small
parts may pose a danger to children.
▶ Store small cells and batteries which could be
swallowed out of the reach of children. Swal-
lowing can result in burns, perforation of the
soft tissue and death. Severe burns can occur
within 2 hours after swallowing. In the event
that a cell or battery is swallowed, seek medi-
cal assistance immediately.
▶ When remotely or automatically controlling a
device, it is not always possible to guarantee
that commands are actually executed or that
the correct device status is displayed in the
app and on other Smart Home display devices
because of external circumstances. This may
lead to material damage and/or personal in-
jury. Therefore, you must ensure to the great-
est extent possible that no person is endan-
gered at the time of remote operation or auto-
mated control. Please take special care when
setting up or adjusting the remote control or
when using the automated control and check
the desired functionality at regular intervals.
▶ Do not open up the device. It does not con-
tain any parts to be maintained by the user. If a
fault occurs, have the device checked by a spe-
cialist.

▶ We accept no liability for material damage or
personal injury which is caused by improper
use or failure to observe the safety instruc-
tions. In these cases, any guarantee claim be-
comes void! We accept no liability for conse-
quential damage.
▶ This device may be used by children from 8
years of age and by persons with reduced
physical, sensory or mental capacities, or a
lack of experience and knowledge provided
these persons are supervised or have been in-
structed in the safe use of the device, and un-
derstand the corresponding risks.
▶ For safety and approval reasons (CE/UKCA),
the device may not be modified and/or no
changes may be made to the device without
authorisation.
▶ Any use other than that which is described in
the user manual is considered improper and
leads to the exclusion of guarantee and liabil-
ity.
▶ Do not use the device if it has damage visible
from the outside, for example, to the housing,
to control or connection elements, or if it has
a malfunction. If in doubt, please contact our
service team.
▶ Only operate the device indoors and do not ex-
pose it to moisture, vibrations, extreme cold
temperatures and mechanical stress.
▶ Only operate the device in dry and dust-free
environments without direct sunlight.
▶ Only use the device together with original com-
ponents and recommended products from
Bosch partners.

Notes
▶ The range within buildings can differ signifi-
cantly from the range in open spaces. In addi-
tion to the transmitting power and the receiv-
ing properties of the receiver, environmental
factors such as humidity, as well as the local
structural situation, play an important role.
▶ The device is only suitable for use in residen-
tial environments.
▶ The device is only intended for private use.
▶ Please note that room temperature control via
the radiator thermostat is designed for a dou-
ble-pipe pressurised heating system with a
flow and return pipe per radiator. Use in sin-
gle-pipe heating systems may result is signifi-
cant differences from the temperature which is
set owing to fluctuations in the flow tempera-
ture.
You can also use the explanatory video and
additional information on our website as
an additional aid for mounting, installing,
starting up and restoring the factory set-
tings on your Bosch Smart Home radiator
thermostat II:
www.bosch-smarthome.com/rom/
radiator-thermostat-2

Product overview
Item Description Explanation
AConnection ring
M 30 × 1.5 mm Is screwed onto the radiator valve or adapter.
BDisplay Only switched on when operating
CStatus LED Multi-coloured, complements the displays on
the screen
DControl knob
• Rotate in direction ++ or –– ,
manually adjust the set temperature
• Press ○○,
confirmation of various operation procedures
EBattery compartment Make sure the polarity is correct when inserting
the batteries!
Item Description Explanation/status
1Battery status Low battery charge
2Wireless status Wireless connection to the controller
3Display area
(adjustable via app)
Display set temperature and further information
(status, device fault, etc.)
4Child lock
Lock/unlock operation on the device:
1. Press ○○ until LCK appears
2. Press ++ or –– to change status
3. Press ○○to confirm
5Ventilation detection Open window detected, valve closed
6Room control manual No time programme active, room temperature is
kept constant
7Room control paused Room control is inactive (heating break), frost
protection is ensured
8Room control automatic Room temperature is changed according to the
active time programme
1 2 3 4 5
6 7 8
C
A
B
D
E

The status LED (C) of the radiator thermostat
supplements the display with application-specific
flashing codes.
Status LED Device status Recommended action
Flashes orange Pairing mode (is
active) or device is
communicating with the
controller
Please wait
Flashes green Pairing mode
(successful) or process
confirmed
Flashes red Pairing mode (not
successful) or
process failed
If this is the first pairing attempt, please try
again. Otherwise observe the fault indication
on the display and contact the service team if
necessary.
In normal operation, a plurality of further
flashing sequences, also in other colours
than those mentioned in the table, are
possible.
Mounting instructions
Property damage owing to defective heat-
ing system!
Mounting of the product on defective heat-
ing systems may result in damage to the
product itself (e.g. owing to leaking hot wa-
ter). Have an expert repair damage to the
valves or to the heating system. Observe
the maintenance intervals for your heating
system including valves.
The device displays errors with a need for
action in the display area (3). For an over-
view of possible error codes, see:
www.bosch-smarthome.com/rom/
radiator-thermostat-2
The standards and directives applicable in
your country must be observed during plan-
ning, set-up, operation and maintenance.
In the event of visible damage to the exist-
ing thermostat, to the valve or to the heat-
ing pipes, please consult an expert.
Take care not to catch your fingers when
screwing on the adapter!

Mounting of the radiator thermostat is simple
and can be done without draining the heating
water or interfering with the heating system.
Special tools or switching off the heating are
not required.
For some heating models, you need one of the
adapters supplied or you need to purchase a
specific adapter from a shop. For a detailed
list of compatible radiator valves and informa-
tion on required adapters, see:
www.bosch-smarthome.com/rom/
radiator-thermostat-adapter
Typical assembly sequence
with one adapter

Resetting to factory settings
You can reset the device to its factory settings as
follows:
Remove a battery. Replace the battery while
holding the “○○” button. Hold the button pressed
until the status LED rapidly flashes orange and
“RES” appears on the display. Now release the
button briefly and press and hold it again until the
LED lights green and the notification on the dis-
play disappears. The device then restarts. Please
note that it can take a few seconds until the ther-
mostat is ready for operation again.
When resetting to factory settings, the set-
tings and information are only lost from the
device and not from the Bosch Smart Home
controller.
To re-configure the device, first delete it
in the device management section of the
Bosch Smart Home app and then add it
again in the usual configuring process.
Maintenance and cleaning
Removing or changing batteriesRemoving or changing batteries
To remove or change the batteries, open the
cover on the bottom of the device and remove
both batteries. Take care to ensure the correct
polarity when replacing them.
The device does not require maintenance. Leave
any repairs to a specialist. Clean the device with
a soft, clean, dry and lint-free cloth. When clean-
ing, do not use any cleaning agents containing
solvents.

Simplified declaration of conformity
Robert Bosch Smart Home GmbH hereby
declare that the radio equipment type
Bosch Smart Home BTH-RA corresponds with the
directive 2014/53/EU. The complete text of the
EU declaration of conformity is available via the
following web address:
https://eu-doc.bosch.com
Robert Bosch Smart Home GmbH hereby
declares that the radio system type
BTH-RA complies with Regulation 2017.
The full text of the declaration of conformity is
available at the following internet address:
https://gb-doc.bosch.com
Environmental protection and
disposal
Electrical or electronic devices which are
no longer usable must be collected sepa-
rately and disposed of via an environmen-
tally friendly recycling facility (European Directive
on Waste Electrical and Electronic Equipment).
Use your country’s specific return and collection
systems when disposing of waste electrical or
electronic devices.
Used batteries do not go in the house-
hold waste! Dispose of them at your local
battery collection point!
Open source software
This Bosch Smart Home product uses open-
source software. License information for the
components used can be found in the attached
documents.

Technical data
Device type
designation
BTH-RA
Protection class IP20
Ambient temperature 0 °C … + 50 °C
Humidity 10 % … 80 %
Housing dimensions
(W × H × D)
51 × 51 × 87 mm
Weight
(without batteries)
135 g
Radio frequency band 2.4 – 2.4835 GHz
Radio protocol ZigBee 3.0
Max. transmitting
power
3 mW
Radio range
in the open
< 50 m
Software class A
Receiver category 2
Batteries 2 × LR6/Mignon/AA
(alkaline)
Battery lifespan
(typical)
< 2 years
Degree of soiling 2
Mode of operation Type 1
Valve connection M30 × 1.5 mm
Max. power
consumption
220 mA / < 0.8 W
Technical modifications reserved

Service information
Robert Bosch Smart Home GmbH
Schockenriedstraße 17
70565 Stuttgart-Vaihingen
Germany
ser[email protected]
@ www.bosch-smarthome.com/service
8-750-002-337 V003 06/2022