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Integration with the Vallox recuperator

The purpose of this article is presenting an integration of Grenton system with Vallox recuperator using Modbus RTU communication protocol.


The recuperator chosen for this presentation is Vallox 149 CFi. The user manual is available in the attachment.


The integration allows to (for example):

  • Read the state of device and turning it ON/OFF,
  • Read the mode of work and change its state,
  • Read the value of outdoor air temperature,
  • Read the value of supply air temperature.

In order to execute this integration, there are needed:

  • Gate Modbus (named Gate_Modbus)
  • Vallox recuperator

 

Configuration of Modbus RTU virtual objects


1. Add ModbusRTU virtual object on Gate_Modbus:

 

2. Enter the value of Embedded features in ModbusRTU virtual objects as follows:


Note! The recuperator's Modbus settings were as follows:

  • address: 1,
  • baud rate: 9600,
  • parity: No,
  • stop bit: 1.

 

* State:




* Mode:




* Outdoor air temperature:




* Supply air temperature:

 

3.Since temperatures are returned in centikelvins, it is necessary to convert them to degrees Celsius. To do this, you need to create the appropriate user features:




Assign the setting of user features values ​​to the OnValueChange events of ModbusRTU virtual objects: 




4. Send the configuration to Gate Modbus.

Example myGrenton interface: