Hi everyone,
I wanted to share my recent success in integrating the Xiaomi Aqara double relay (LLKZMK11LM) with my Stork Air WHR 930 mechanical ventilation system. This project has been a labor of love, and I’m thrilled to finally have a fully automated system that not only improves indoor air quality but also integrates seamlessly with my smart home setup.
Background
For those who might not be familiar, the Stork Air WHR 930 is a high-performance heat recovery ventilation system. While it’s incredibly efficient, it lacks smart controls out of the box. My goal was to automate the system’s operation based on real-time conditions, such as CO2 levels and occupancy.
The Challenge
The primary challenge was finding a Zigbee-compatible device that could control the system’s three-speed motor. Most solutions I found online relied on Z-Wave devices, but I already have a robust Zigbee mesh network in my home. After some research, I discovered that the Xiaomi Aqara double relay could be adapted for this purpose.
The Solution
Here’s a step-by-step overview of how I achieved this:
1. Preparation
- Research: I started by researching the Stork Air WHR 930’s wiring diagram to understand how the motor speeds were controlled. This involved identifying the live wires (L1, L2, L3) and the neutral wire (N).
- Purchase: I ordered the Xiaomi Aqara double relay and waited for it to arrive.
2. Installation
- Power Off: I switched off the mains power to the ventilation system to ensure safety during installation.
- Access the Unit: Following the manufacturer’s instructions, I carefully opened the unit’s casing to access the wiring.
- Wiring: I connected the neutral wire (N) and live wire (L3) to the relay’s input terminals. I then connected L1 and L2 to the respective output terminals of the relay.
- Mounting: I mounted the relay inside the unit, ensuring the Zigbee antenna had optimal coverage.
3. Configuration
- Pairing: I used the Homey app to pair the relay with my Zigbee network. This was straightforward, and the relay was recognized almost immediately.
- Testing: I tested the relay’s functionality by manually switching it on and off through the Homey app. The ventilation system responded perfectly, cycling through its three speeds as expected.
4. Automation
- CO2 Monitoring: I integrated my Netatmo weather station to monitor indoor CO2 levels. Using Better Logic, I created a flow that adjusts the ventilation system’s speed based on real-time CO2 readings.
- Occupancy Detection: I linked the system to my existing motion sensors and door contacts to ensure the ventilation system operates efficiently when the house is occupied.
Results
The outcome has been nothing short of amazing. My ventilation system now operates seamlessly with my smart home ecosystem. It adjusts its speed based on indoor air quality and occupancy, ensuring optimal comfort and energy efficiency.
Lessons Learned
- Research is Key: Understanding the inner workings of my ventilation system was crucial to the project’s success.
- Zigbee Compatibility: Choosing a Zigbee-compatible device was a game-changer. It allowed me to integrate the relay into my existing network without hassle.
- Automation Enhances Functionality: Combining smart devices with automation has taken my home’s comfort and efficiency to the next level.
Final Thoughts
This project has been a fantastic learning experience, and I’m proud of the result. It’s a testament to the power of smart home technology and the creativity that can be applied to improve our daily lives.
If anyone has questions or needs assistance with a similar project, please don’t hesitate to reach out. I’d be happy to help!
Cheers,
[Your Name]