Baxi Usense 2 Smart Room Thermostat Installation Guide

• User Guide
• Room unit
• Screw and plug fixings
• Mounting bracket

• Wear appropriate Personal Protection Equipment (e.g.,
  protective gloves, safety footwear).
• Position the uSense 2 room unit considering factors such as
  distance from heat sources (e.g., radiators, candles) and wiring
  limitations (maximum distance to the room unit is 50m).
• Warning: High Voltage wiring must only be
  installed and worked on by a suitably qualified person.
• Prior to installation, ensure the power to the heating and
  control system is isolated and made safe by removing or locking off
  the fuse. Use suitable test equipment to confirm power
  isolation.

1. Choose a suitable location for the uSense 2 thermostat (refer
   to “Before you start” section on page 5 of the manual).
2. If applicable, remove the existing thermostat.
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 and connect them into the
   connector block on the room unit backplate.
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. Ensure the wires are as flat as possible against the back plate
   to avoid interference with the controller when it is mounted in
   position.
8. Press the room unit onto the backplate until it clicks into
   place.

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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1. Compatibility

The Baxi uSense 2 Wired Smart Thermostat is compatible with all appliances using the 230 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.

Compability
The Baxi uSense 2 Smart Room Thermostat is compable with
All Baxi, Poerton & Main Combi boilers Baxi Air Source Heat Pumps (ASHP). An addional uSense 2 Gateway & Power Adapter Kit Accessory may also be required (see table below)

Baxi uSense 2 Range
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

X

Main Eco Compact Ranges

All other Baxi, Poerton & 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 fied via OpenTherm or RBUS connecon. (ii) For mulple zones a Baxi uSense 2, Gateway & Power Adapter Kit is required for each zone.
(iii) This control is NOT compable with System or Heat Only Boilers.
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2. In the box

1

2

4

3

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

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3. Before you start

Wear appropriate Personal Protection Equipment e.g. protective gloves, safety footwear etc.

Positioning the uSense 2:

The room unit must be positioned taking into

account the following factors:

1.5 mm

· 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

Warning: High Voltage wiring must only be installed and worked on by a suitably qualified person.

Prior to installation make sure to: 1. Isolate the power to the heating and control
system and make safe (remove or lock off fuse) 2. Check that the power has been isolated
using suitable test equipment.

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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 2 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 2 (OpenTherm installations only) you can ONLY adjust the heating curve on the uSense 2 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 affect 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

uSense 2 room unit
Dimensions Width x height x depth (maximum dimensions) Power supply R-Bus connection voltage Maximum power consumption Electrical connection Maximum cable length for dedicated room unit R-Bus Ambient conditions Storage temperature Relative humidity Operating conditions

120 x 90 x 27 mm
24 V ± 5% 1.5 W
50 m
25 – 70 °C 5 – 95 °C Condensation is not allowed 0 – 60 °C

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uSense 2 room unit
Technical data Room temperature measurement range Maximum temperature deviation at 20 °C Maximum room control overshoot after pre-heating Temperature variation Outside temperature Temperature control area

5 – 60 °C 0.3 °C
1 °C
+/- 0.25 °C Refer to appliance documentation 10 – 30 °C

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Compliant with standards: EMC: 108/2004/EC, EN 55022, 55014 Immunity: EN2-6-61000 EN2-6-61000 (EMC part 6.2 generic standards) ETSI-EN 17-489 301 (electromagnetic compatibility and radio spectrum matters) R&TTE Directive 5/1999/EC EN 1-60950 (ITE – Safety – Part 1: general requirements) Low voltage directive (95/2006/EC) WEEE directive (96/2002/EC) (disposal requirements) Drop test: IEC 32-2-60068 Protection classification: IP22

ErP Fiche Information
Class Contribution to space heating energy efficiency
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On modulating appliance
V

On modulating appliance, with outdoor sensor
VI

3%

4%

On On/Off appliance
IV 2%

Notes
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Notes
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Notes
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For tech support 0344 871 1545
Opening hours Monday – Friday, 8.00am-6.00pm Weekends and Bank Holidays, 8.30am-2.00pm
Please note calls may be recorded for training and monitoring purposes
baxi.co.uk
Baxi Brooks House, Coventry Road, Warwick. CV34 4LL
Warranty registration For the parts warranty to be activated and maintained, please register the uSense 2 Smart Thermostat at: baxiworks.co.uk Please note: if you do not register the warranty, a basic 12 month warranty will apply. For full terms and conditions visit baxi.co.uk/usense/terms
Please ensure the uSense 2 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.
7840908-01
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References

• Baxi Boilers | Baxi
• Works - Baxi's loyalty scheme for installers
• Baxi Boilers | Baxi