BAXI uSense 2 Wired Smart Thermostat Gateway Installation Guide

BAXI uSense 2 Wired Smart Thermostat Gateway

Product Information

Product Name: Baxi uSense 2 WiredSmart Thermostat Gateway
Compatibility: This gateway is compatible with all appliances using the 230 V switched live and also has OpenTherm and RBUS capability.
Part Number: 7775937 –
Additional Accessory: uSense 2 Gateway & Power Adapter Kit (sold separately),
Part Number: 7822453

Product Usage Instructions

Compatibility:

• Before installing the Baxi uSense 2 Wired Smart Thermostat Gateway, ensure that it is compatible with your specific Baxi product. Refer to the compatibility table provided in the user manual for a list of compatible products.

In the box:

• The gateway package includes the following items:
  • The gateway
  • Installation guide
  • Screw and plug fixings
  • 230 V power adaptor
  • Adhesive pad for power adaptor

Before you start: Prior to installation, follow these precautions:

• Wear appropriate Personal Protection Equipment (PPE) such as protective gloves and safety footwear.
• Position the uSense 2 room unit considering factors such as distance from other sources of heat (e.g., candles) and ensuring a maximum distance of 50 m between the room unit and the gateway.
• Note : High Voltage wiring should only be installed and worked on by a suitably qualified person.

Installation:
Follow these steps to install the Baxi uSense 2 Wired Smart Thermostat Gateway:

• Run power to the gateway: Use the provided power adaptor to connect the gateway to the L (live) and N (neutral) connectors on the appliance or junction box.
• Connect the plugged end of the power adaptor into the 24 V terminal on the gateway.
• Ensure all cables are properly supported
• The power adaptor and wiring should not be inside the appliance.
• Use the adhesive pad provided to support the power adaptor.
• Installation of 230V switched connection: If using OpenTherm, refer to the next page. Otherwise, connect the system control wiring to the gateway.
• Consult the appliance installation and service manual for specific instructions on connecting the system control wiring.
• The gateway terminals labeled ON/OFF are used for 230 V switching.
• The gateway terminals labeled OT are used for OpenTherm connection to compatible appliances. For more detailed instructions, refer to the user manual available at www.baxi.co.uk.

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.

Compatibility

This Gateway & Power Adapter Kit is only required for certain products in the Baxi range, see the table below. The Baxi uSense 2 Wired Smart Thermostat is compatible with all appliances using the 230 V switched live and also has OpenTherm and RBUS capability

In the box

Gateway package:

1. The gateway
2. Installation guide
3. Screw and plug fixings
4. 230 V power adaptor
5. Adhesive pad for power adaptor

Before you start

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

Installation

The gateway
When connecting the gateway to an appliance that has an existing programmer and/or thermostat, it is essential that the function of all wiring is established prior to work. Make sure you identify the L
(live), N (neutral), E (earth), common and call for heat switched live correctly before connecting. Incorrect wiring will result in damage to the gateway, room unit and appliance which will invalidate the warranty.

Fix the gateway in position
Determine the position of the gateway. It should be close to either the appliance or control system junction box. Make sure there is enough space around the gateway for installation and maintenance, including screwdriver access.

Run power to the gateway
Use the power adaptor supplied to connect the gateway to the L (live) and N (neutral) connectors on the appliance or junction box. Connect the plugged end of the power adaptor into the 24 V terminal on the gateway.

1. All cables must be supported
2. The power adaptor and wiring must not be inside the appliance
3. The power adaptor must be supported (adhesive pad is supplied for this)

Installation of 230V switched connection

(See next page if using OpenTherm)

Connect the system control wiring to the gateway
Read in conjunction with the appliance installation and service manual

• Gateway terminals – ON/OFF are for 230 V switching
• Gateway terminals – OT are for OpenTherm connection to compatible appliances
• Gateway terminals – R-BUS are for connection to the uSense room unit

WARNING
These components are low voltage – 230 V will damage the room unit and gateway.

To connect using the ON/OFF terminals

1. Connect the common from the appliance or junction box to the ON terminal on the gateway
2. Connect the switch live terminal or junction box to the OFF terminal on the gateway
3. The cable used must be 0.75 mm multi strand flexible cable conforming to BS 50525-2-11

Installation of OpenTherm connections

To connect using the OT terminals

1. Connect the OpenTherm connectors on the appliance to the OT terminals on the gateway
   Do not connect 230 V to these terminals or it will damage the gateway

2. These will communicate with the appliance to control the heating and other functions

3. These connections can be made using bell wire. There is no polarity at the OT terminals

To connect the gateway to the uSense 2 using the R-BUS terminals

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 terminals in the gateway (there is no polarity – either wire can be connected to either position)
10. The connection between the room unit and gateway is low voltage, 230 V will damage the room unit and gateway!

Set up the uSense 2 room unit
Before turning on the power to the gateway, room unit and heating system, preliminary electrical tests should be carried out.

1. These should be carried out using a suitable meter, and include checks for earth continuity, resistance to earth, short circuit and polarity
2. Turn on the power to the gateway and check that the gateway and room unit power up. See page 19 for LED key
3. Download the Baxi Thermostat App and create a uSense account

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 Baxi Thermostat App (you CANNOT adjust using the room unit or appliance controls).

1. Open the Baxi Thermostat 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

uSense 2 room unit ****

Gateway

Gateway LED key

The LED on the gateway indicates the following modes and faults:

For technical support call 0344 871 1545

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

References

• Baxi Boilers | Baxi
• Baxi Boilers | Baxi

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