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Installing the Wondrwall Thermostat

Guidance for qualified electricians on mounting and wiring the Wondrwall Thermostat for heating and cooling control.

Introduction

The Wondrwall Thermostat is a battery-powered ZigBee device that controls heating and cooling systems. It provides manual operation via its LCD display and +/– buttons, as well as remote control through the Wondrwall app.

Correct installation is important for reliable communication, accurate temperature control, and long battery life.

This article provides step-by-step instructions for qualified electricians to install the Wondrwall Thermostat.

Safety & Compliance

Caution: This product must only be installed by qualified electricians.

  • Isolate the heating/cooling circuit and the boiler or heat source before beginning work. Some circuits do not isolate the boiler, and live parts may remain energised.

  • Regulatory compliance: follow BS7671 wiring regulations and all relevant building codes.

  • PPE: use safety glasses, insulated gloves, and a dust mask. Hearing protection may be required if drilling into masonry.

  • Batteries: only use 2× AA alkaline batteries (supplied). Do not use rechargeable or “heavy-duty” batteries.

Before You Begin

Prerequisites:

  • Heating/cooling system wiring is accessible at the chosen location.

  • ZigBee coverage available from the master Wondrwall Light Switch.

Tools required:

  • Insulated screwdriver set.

  • Voltage tester.

  • Drill and wall plugs (if mounting on masonry).

Installation Steps

Step 1: Prepare the Location

  • Choose a central wall position in the zone, between 1.2 m and 1.5 m above floor level (1.2 m if accommodating wheelchair users).

  • Avoid placing above radiators, near doors/windows, or in direct sunlight.

Step 2: Wire the Thermostat

  • The thermostat contains a 230V, 5A relay (check relay spec before wiring).

  • Normally, only two relay terminals are used: COM and NO (Normally Open).

  • Connect the heating/cooling system wiring through the central opening on the back cover to the correct relay terminals.

  • Ensure insulation is intact and no bare copper is exposed.

  • Mark and secure wiring clearly for handover.

Step 3: Mount the Back Cover

  • Use the mounting holes on the back cover as a template to mark the location.

  • Drill holes, insert wall plugs if required, and secure the back cover with screws.

  • Ensure the back cover is flush and secure.

Step 4: Insert Batteries

  • The battery compartment is accessible on the back cover.

  • Insert 2× AA alkaline batteries observing correct polarity.

  • You do not need to remove anything further once the back cover is fitted.

Step 5: Fit the Thermostat Body

  • Replace the front face/main body of the thermostat onto the back cover.

  • Ensure the two prongs slot correctly into their housing points.

  • Press gently until the body clicks securely into place.

Step 6: Removing the Thermostat Body (if required)

  • To remove the front face/main body from the back plate:

    1. Locate the two vertically aligned clips on either side of the unit.

    2. Squeeze both clips gently.

    3. While holding the clips, pull the front face away from the backing plate in a smooth motion.

  • Take care not to lever with tools or force the clips, as this may damage the housing.

Verification

After installation:

  • The thermostat will always power on if batteries are present.

  • Enable the heating circuit and the end heating device (e.g. boiler).

  • On the LCD, check for the heat icon. When the thermostat calls for heat:

    • The relay clicks.

    • The end device fires up.

  • Test manual control:

    • Tap the + button once per second to increase setpoint.

    • Tap the – button once per second to decrease setpoint.

    • Avoid holding buttons down, as this can confuse the device.

Common Installation Errors to Avoid

  • Mounting in direct sunlight or above a radiator.

  • Incorrectly wired relay terminals (COM/NO/NC).

  • Using rechargeable or heavy-duty batteries.

  • Loose mounting leading to poor contact between prongs and housing.

Handover to Wondrwall Engineer

Before leaving site:

  • Confirm the thermostat powers on with the LCD active.

  • Demonstrate that a call for heat displays the heat icon, activates the relay, and fires the end device.

  • Provide wiring details and confirm battery type used.

FAQs

Q: How do I remove the thermostat body after installation?
Locate the two vertically aligned clips, squeeze gently, and pull the front face away from the backing plate. The body should release smoothly without force.

Q: What batteries does the Thermostat use?
2× AA alkaline batteries only. Do not use rechargeable or heavy-duty batteries.

Q: How does the Thermostat communicate?
Via ZigBee, using the master Wondrwall Light Switch as its hub.

Q: Can the Thermostat be mounted anywhere in the home?
No. Avoid heat sources, draughts, and direct sunlight for accurate readings.

Q: Does the Thermostat need mains power?
No. It is battery powered, but its relay terminals can switch 230 V, 5 A circuits.