Viessmann Heating & Cooling

Use cases

• Monitor outside, buffer, and flow temperatures on a live cloud dashboard for remote system oversight.
• Adjust warm water and heating circuit target temperatures remotely without visiting the installation site.
• Create an alert when the buffer temperature drops below a defined threshold for more than 15 minutes.
• Track circulation pump run states for HC2, HC3, and warm water to detect cycling or pump failures early.
• Log generator temperature trends over time to support preventive maintenance scheduling.
• Switch heating circuit operation modes between standby, heating, and reduced mode based on seasonal needs.

Installation

1. 1Connect the Vitogate 300 BN/MB gateway to the Vitotronic controller via the LON bus communication module and verify that the LON connection is active.
2. 2Configure the Vitogate 300 for Modbus TCP or Modbus RTU communication, setting the desired slave address, baud rate (typically 9600), and parity (even, 8 data bits, 1 stop bit) as specified in the Vitogate documentation.
3. 3Wire the ModbusCloud gateway (MCG or MLP series) to the Vitogate 300 using an Ethernet cable for Modbus TCP or a shielded twisted pair cable with correct A/B polarity for Modbus RTU.
4. 4Power on both gateways and confirm that the Modbus connection LED on the Vitogate 300 indicates active communication.
5. 5Import the Viessmann Heating and Cooling template in the ModbusCloud platform, assign it to your gateway, and set the correct Modbus slave address to match the Vitogate 300 configuration.
6. 6Verify that live readings such as outside temperature and pump states appear on the ModbusCloud dashboard before completing the installation.

Things to watch for

Registers (16)

16 read / 6 write

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