Watts MILUX 2 RF Digital Room Thermostat Instruction Manual

1. Product Overview

The Watts MILUX 2 RF is a digital, wireless room thermostat designed for precise temperature control in central heating systems. It offers advanced programming capabilities and user-friendly operation to optimize comfort and energy efficiency.

Key Features:

• Wireless radio frequency communication.
• 7-day programmable schedule.
• 9 pre-set factory programs and 4 user-definable programs.
• Graphical program display.
• Display of ambient temperature and time.
• Comfort, Reduced, and Frost Protection (Hors-Gel) temperature settings.
• Temporary temperature override function.
• Automatic or Manual operating modes.
• Holiday function.
• Keyboard lock for child protection.
• Low battery indicator.
• Battery replacement without memory loss (within 1 minute).

This image displays the Watts MILUX 2 RF digital room thermostat unit on the left, featuring an LCD screen showing temperature (20.3°C) and time (09:35), along with control buttons for navigation and settings. To the right is the wireless receiver unit, designed to communicate with the thermostat and the heating system.

2. Safety Information

Please read this manual carefully before installation and operation. Retain it for future reference.

• Installation should be performed by a qualified professional in accordance with local regulations.
• Ensure the power supply to the heating system is disconnected before any installation or maintenance work.
• Do not expose the thermostat or receiver to moisture, extreme temperatures, or direct sunlight.
• Use only the specified battery type (LR06/AA) and ensure correct polarity.
• Keep batteries out of reach of children.

3. Package Contents

Verify that all components are present in the package:

• Watts MILUX 2 RF Digital Room Thermostat Unit
• Wireless Receiver Unit
• 3 x LR06 (AA) Batteries
• Mounting hardware (screws, wall plugs)
• Instruction Manual

4. Setup

4.1. Battery Installation (Thermostat Unit)

1. Open the battery compartment cover on the back of the thermostat unit.
2. Insert the 3 x LR06 (AA) batteries, observing the correct polarity (+/-) as indicated.
3. Close the battery compartment cover. The thermostat display should activate.

4.2. Receiver Unit Installation

The receiver unit should be installed near your central heating boiler or manifold for underfloor heating, in a location that allows for good radio frequency communication with the thermostat unit. Ensure the power supply to the heating system is off before installation.

1. Mount the receiver unit securely to a wall using the provided screws and wall plugs.
2. Connect the receiver unit to your heating system according to the wiring diagram provided in the separate installation guide (typically included with the product or available from Watts). This usually involves connecting to the boiler's thermostat terminals.
3. Restore power to the heating system.

4.3. Thermostat Unit Placement

Place the thermostat unit in a central room, away from direct heat sources (e.g., radiators, direct sunlight) and drafts, to ensure accurate temperature readings.

4.4. Pairing (Initial Connection)

The thermostat and receiver units are typically pre-paired at the factory. If pairing is required or lost:

1. Refer to the detailed pairing instructions in the separate installation guide.
2. Generally, this involves pressing a pairing button on the receiver unit and then initiating a pairing sequence on the thermostat unit.
3. A successful pairing will be indicated on both units (e.g., an LED on the receiver, a symbol on the thermostat display).

5. Operating Instructions

5.1. Setting Time and Day

Upon initial power-up or after a long battery change, you may need to set the current time and day. Use the navigation buttons (usually ▲ / ▼ or + / -) and the OK/1 button to adjust and confirm.

5.2. Operating Modes

The MILUX 2 RF offers several operating modes:

• Automatic Mode (Auto): Follows the programmed schedule for temperature changes.
• Manual Mode: Maintains a constant temperature set by the user, overriding the schedule.
• Holiday Function: Sets a specific temperature for a defined period (e.g., frost protection) while you are away.

Use the mode selection button (often labeled with symbols like a sun, moon, or 'Auto') to cycle through available modes.

5.3. Programming the Schedule (7-Day)

The thermostat allows for a 7-day programming schedule with multiple time/temperature periods per day. You can choose from 9 pre-set factory programs or create up to 4 custom user programs.

1. Enter programming mode (refer to the specific button sequence in your detailed manual).
2. Select the day or group of days you wish to program.
3. Choose a pre-set program or begin creating a custom program.
4. Adjust the start time and desired temperature for each period using the navigation buttons.
5. Confirm each setting and save the program.

5.4. Temperature Adjustment

• Temporary Override: In Automatic mode, pressing the ▲ or ▼ buttons will temporarily adjust the temperature until the next programmed change.
• Permanent Adjustment (Manual Mode): In Manual mode, the set temperature will be maintained indefinitely until changed again.
• Comfort / Reduced / Frost Protection: These are pre-defined temperature levels that can be selected or programmed. Frost Protection (Hors-Gel) typically maintains a low temperature (e.g., 7°C) to prevent pipes from freezing.

5.5. Keyboard Lock (Child Protection)

To prevent unintended changes, activate the keyboard lock function. Refer to your detailed manual for the specific button combination to activate and deactivate this feature.

6. Maintenance

6.1. Cleaning

Wipe the thermostat and receiver units with a soft, dry cloth. Do not use abrasive cleaners, solvents, or spray directly onto the units.

6.2. Battery Replacement

When the low battery indicator appears on the thermostat display, replace the batteries promptly.

1. Open the battery compartment.
2. Remove the old batteries.
3. Insert 3 new LR06 (AA) batteries, ensuring correct polarity.
4. Close the compartment. The thermostat is designed to retain memory for approximately 1 minute during battery replacement.

7. Troubleshooting

• Thermostat display is blank: Check batteries and ensure they are inserted correctly. Replace if necessary.
• Heating not responding:
  • Check if the receiver unit has power.
  • Verify that the thermostat and receiver are paired correctly.
  • Ensure the thermostat is in an appropriate operating mode (e.g., not in Frost Protection if you expect heating).
  • Check the set temperature is above the ambient temperature.
• Inaccurate temperature reading: Ensure the thermostat is not exposed to direct sunlight, drafts, or heat sources.
• Loss of settings: If settings are lost after battery replacement, ensure the replacement was done within 1 minute. Otherwise, reprogram the unit.
• Reset Function: If the unit is unresponsive, a reset function may be available. Refer to your detailed manual for instructions on performing a reset.

For persistent issues, contact Watts customer support or a qualified technician.

8. Specifications

9. Warranty and Support

For warranty information, technical support, or spare parts availability, please refer to the documentation provided with your product or visit the official Watts website. Keep your proof of purchase for warranty claims.