Systemair SAVE VSR Integration

Custom Home Assistant integration for Systemair SAVE VSR ventilation units via Modbus RTU (RS485).

Status: Active development - tested on VSR 500 with USB Modbus connector

Features

• Climate Control: Full HVAC control with preset modes (Auto, Manual, Fireplace, etc.)
• Temperature Sensors: Outdoor, Supply, Exhaust, Overheat temperatures
• Fan Monitoring: RPM and percentage for both supply and extract fans
• Power Monitoring: Real-time power consumption for fans and heater
• Energy Dashboard: Native energy sensors for Home Assistant Energy Dashboard
  • Fans Energy: Combined energy consumption of supply + extract fans
  • Heater Energy: Separate heater energy consumption
• Alarms: Comprehensive alarm monitoring (frost protection, filters, sensors, etc.)
• Countdown Timers: Remaining time for temporary modes (Away, Fireplace, etc.)

Installation

1. Temporarily disable any existing Modbus config in your HA configuration
2. Copy all files from this repo to config/custom_components/save_vsr/
3. Restart Home Assistant
4. Go to Settings → Devices & Services → Add Integration
5. Search for "Systemair VSR" and configure your connection
6. Test and report any issues

Energy Dashboard Setup

The integration provides two energy sensors compatible with Home Assistant's Energy Dashboard:

1. Fans Energy (sensor.vsr_fans_energy)

   • Tracks combined energy consumption of supply and extract fans
   • Replaces generic power calculation tools for ventilation unit

2. Heater Energy (sensor.vsr_heater_energy)

   • Tracks heater energy consumption separately
   • Useful for analyzing heating costs

Adding to Energy Dashboard:

1. Go to Settings → Dashboards → Energy
2. Click "Add Consumption"
3. Select sensor.vsr_fans_energy and/or sensor.vsr_heater_energy
4. Energy data will accumulate automatically and persist across restarts

Technical Details

• Protocol: Modbus RTU over RS485
• Library: pymodbus (async)
• Update Interval: 30 seconds (configurable)
• Energy Calculation: Real-time power integration with state restoration
• Supported Models: VSR 500 (other models may work but untested)

Branding

This integration uses the domain save_vsr to avoid conflicts with other Systemair integrations. The integration icon/logo is managed through the Home Assistant brands repository.

Note: Local PNG files (icon.png, logo.png) are not used by Home Assistant for integration cards. To add custom branding:

1. Create a Pull Request to the brands repository
2. Add your logos under custom_integrations/save_vsr/
3. Follow the contribution guidelines

Until then, the integration will use Home Assistant's default icon.

Development

Integration created with AI assistance. Contributions welcome!