BAXI uSense 2 Smart Room Thermostat Installation Guide

BAXI uSense 2 Smart Room Thermostat

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.

In the box

Room unit package

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

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:

• 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 off fuse)
2. Check that the power has been isolated using suitable test equipment.

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

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
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!

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).

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.

Technical specifications

uSense 2 room unit

Dimensions|
---|---
Width x height x depth (maximum dimensions)| 120 x 90 x 27 mm
Power supply|
R-Bus connection voltage| 24 V ± 5%
Maximum power consumption| 1.5 W
Electrical connection|
Maximum cable length for dedicated room unit R-Bus| 50 m
Ambient conditions|
Storage temperature| 25 – 70 °C
Relative humidity| 5 – 95 °C Condensation is not allowed
Operating conditions| 0 – 60 °C
Technical data|
---|---
Room temperature measurement range| 5 – 60 °C
Maximum temperature deviation at 20 °C| 0.3 °C
Maximum room control overshoot after pre-heating|

1 °C

Temperature variation| +/- 0.25 °C
Outside temperature| Refer to appliance documentation
Temperature control area| 10 – 30 °C
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

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

• Brooks House,
• Coventry Road,
• Warwick. CV34 4LL
• baxi.co.uk

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.

References

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

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