Baxi uSense 2 User manual

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Give your customers
completecontrol
Baxi uSense 2 Wired Smart Thermostat Installation guide

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Contents
1 Compatibility
2 In the box
3 Before you start
4 Installation
5 OpenTherm hot water control (combi only)
6 Outdoor sensor
7 Technical specifications
You can find more detailed instructions at www.baxi.co.uk
Warning: High Voltage wiring must only be installed
and worked on by a suitably qualified person.

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The Baxi uSense  Wired Smart Thermostat is compatible with all appliances using the  V
switched live and also has OpenTherm and RUB capability.
A Gateway & Power Adapter Kit is only required for certain products in the Baxi range, see
the table below.
1. Compatibility
Range Baxi uSense 2
Part Number : 7775937
uSense 2 Gateway &
Power Adapter Kit
(sold separately)
Part Number : 7822453
Baxi 200 Combi 2 Ranges X
Baxi 400 Combi 2 Ranges X
Baxi 600 Combi 2 Ranges X
Baxi 800 Combi 2 Ranges X
Baxi Assure 500 Combi 2 Ranges
Main Eco Compact Ranges
X
All other Baxi, Poerton & Main Combi Ranges


Baxi Split ASHP (Heat Pump)

X
Baxi Assure Mono ASHP (Heat Pump)




Baxi HP40 Mono 2 AWHP (Heat Pump)

Baxi Assure HP50 Mono 2 AWHP (Heat Pump)


(i) Baxi uSense 2 is Boiler Plus Compliant when ed via OpenTherm or RBUS connecon.
(ii) For mulple zones a Baxi uSense 2, Gateway & Power Adapter Kit is required for each zone.
(iii)This control is NOT compable with System or Heat Only Boilers.
Compa�bility
The Baxi uSense 2 Smart Room Thermostat is compable with
All Baxi, Poerton & Main Combi boilers

Baxi Air Source Heat Pumps (ASHP).
An addional uSense 2 Gateway & Power Adapter Kit Accessory may also be required (see table below)

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2. In the box
Room unit package:
1 User guide
2 Room unit
3 Screw and plug fixings
4 Mounting bracket
1 2
3
4

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3. Before you start
Positioning the uSense :
The room unit must be positioned taking into
account the following factors:
• On an internal wall
• Away from draughts
• 1.2-1.5 m from the floor
• Not behind doors, bookcases or other objects
• Not in direct sunlight
• In a room where the user spends most of their time
• Away from heat sources (fireplace, radiators, light,
candles, etc.)
• The maximum cable length from the gateway
to the room unit is 50 m
Prior to installation make sure to:
1. Isolate the power to the heating and control
system and make safe (remove or lock o fuse)
2. Check that the power has been isolated
using suitable test equipment.
Wear appropriate Personal Protection Equipment
e.g. protective gloves, safety footwear etc.
Warning: High Voltage wiring must
only be installed and worked on by
a suitably qualified person.
1.5 m
1.5 m

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4. Installation
1. Choose a suitable location for the
uSense 2 thermostat (see Before
you start section on page 5)
2. Remove existing thermostat
(if applicable)
3. Fix the room unit backplate to the wall
using the screws provided
4. Either use existing thermostat wires
or run new wires from the gateway
(there is no polarity - either wire can
be connected to either position)
5. Trim the wires coming out of the wall,
connect them into the connector block on
the room unit backplate
continued opposite

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6. Slacken the screws at the sides of the
connectors and insert each wire into the
top at either side of the connector, then
re-tighten the screws
7. Make sure the wires are as flat as possible
against the back plate so that they do
not interfere with the controller when it is
mounted in position
8. Press the room unit onto the backplate until
it clicks into place
9. Connect the other end of the wires
to the R-BUS or OpenTherm terminals in
the boiler (or gateway if fitted). There is no
polarity - either wire can be connected to
either position
10. The connections between the
room unit and boiler or gateway
are low voltage. 230 V will
damage the room unit and
gateway!

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5. OpenTherm hot water control
The uSense  room unit will override the hot water temperature controls
on your appliance (OpenTherm only).
1. The room unit will automatically default the hot water temperature to 60 °C
when connected by OpenTherm
2. The room unit will automatically default the heating flow temperature to 80 °C
when connected by OpenTherm
3. These settings can be adjusted to your required comfort level using the uSense 2
room unit only (the appliance controls and App can’t adjust these settings
when the room unit is connected with OpenTherm).

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6. Outdoor sensor
Connecting to an outdoor sensor
If an outdoor sensor weather compensator is connected in conjunction
with the uSense  (OpenTherm installations only) you can ONLY adjust the
heating curve on the uSense  App (you CANNOT adjust using the room
unit or appliance controls).
1. Open the Baxi uSense 2 App
2. Click on the installer menu
3. Click on advance settings
4. Enter service code 0012 Remember to re-enter this code to disable
installer access when you finish adjusting the heating curve
5. You will see a message ‘Your access level has been updated’
6. Click OK
7. Click on heating curve
8. Change the curve to suit the requirements of the user in accordance
with the recommendations of the sensor manufacturer
9. Do not adjust any other settings in the Advanced Feature menu,
as they may aect the correct operation of the appliance
10. Either completely close the App or re-enter the code to cancel the
access level so that your customer can’t adjust important settings.

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7. Technical specifications
Dimensions
Width x height x depth (maximum dimensions)  x  x  mm
Power supply
R-Bus connection voltage  V ± %
Maximum power consumption . W
Electrical connection
Maximum cable length for dedicated room unit R-Bus  m
Ambient conditions
Storage temperature  -  °C
Relative humidity  -  °C Condensation is not allowed
Operating conditions  -  °C
uSense  room unit

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uSense  room unit
Technical data
Room temperature measurement range  -  °C
Maximum temperature deviation at  °C . °C
Maximum room control overshoot
after pre-heating  °C
Temperature variation +/- . °C
Outside temperature Refer to appliance documentation
Temperature control area  -  °C

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Compliant with standards:
EMC: //EC, EN , 
Immunity: EN--
EN-- (EMC part . generic standards)
ETSI-EN -  (electromagnetic compatibility and radio spectrum matters)
R&TTE Directive //EC
EN - (ITE - Safety - Part : general requirements)
Low voltage directive (//EC)
WEEE directive (//EC) (disposal requirements)
Drop test: IEC --
Protection classification: IP
ErP Fiche Information On modulating
appliance
On modulating
appliance, with
outdoor sensor
On On/Off
appliance
Class VVI IV
Contribution to space heating
energy efficiency % % %

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Notes

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Notes

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Notes

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For tech support
  
Opening hours
Monday - Friday, .am-.pm
Weekends and Bank Holidays, .am-.pm
Please note calls may be recorded for training and monitoring purposes
baxi.co.uk
Baxi
Brooks House,
Coventry Road,
Warwick. CV LL
7840908-01
Please ensure the uSense  is installed in accordance with these installation
instructions and that you adhere to the Building Regulations.
e&oe
All descriptions and illustrations provided in this document have been carefully prepared
but we reserve the right to make changes and improvements in our products which may
affect the accuracy of the information contained in this booklet. All goods are sold subject
to our standard Conditions of Sale which are available on request.
Warranty registration
For the parts warranty to be activated and maintained, please register the
uSense  Smart Thermostat at: baxiworks.co.uk
Please note: if you do not register the warranty, a basic  month warranty will apply.
For full terms and conditions visit baxi.co.uk/usense/terms