Control of TTE devices - wladwnt/CAN-Gateway GitHub Wiki

The number and descriptions of the available parameters (data points) could be a bit confusing. In particular, questions often arise about how to control the devices. To help you, some use cases are described below. This information only describes the minimal scope. There are many more possible control options, but they are much more complicated and require a deeper understanding of the system.

1. TTE-WEZ (e.g. heat pump): Setpoint specification for room temperature and hot water temperature

You usually have one or more heating circuits and one or more hot water circuits in your system. The target temperature can be specified for each circuit via the CAN gateway.

  • Specification of the target room temperature. This has to be done in two steps. First you have to set the heating circuit to “Constant” mode (value=4) using the “Heating operation selection” parameter (ID=3050). In this mode, the setpoint can then be specified via the “Normal room temperature heating mode” parameter (ID=3051). The target flow temperature is automatically calculated by the heating controller from the target room temperature and the heating characteristic curve, among other things, and normally cannot be changed directly. Direct changes are only possible through special reconfiguration of the system parameters.

  • Specifying the target hot water temperature: This must be done in two steps. First you have to set the hot water circuit to “Constant” mode (value=4) using the “Hot water operation selection” parameter (ID=5050). In this mode, the setpoint can then be specified via the “Normal hot water temperature” parameter (ID=5051).

For experienced users: Detailed information about the heating and cooling characteristics:

Note on heat generator (Function group 10=“Heat generator”, function number 1=“Heat generator”): There is theoretically the possibility of specifying the setpoint directly to the heat generator (set the value to 4 “Heating” via parameter with ID=9075 “Heat generator operation selection”, then optionally set the setpoint in % of the value via parameter with ID=9058 “Manual mode power setpoint”. Output must be specified - for two-stage heat generators up to 49% first stage, up to 100% two stages - and then set the setpoint via parameter with ID=9020 "Manual mode temperature setpoint"). However, this is not recommended for normal users/ordinary home systems.

2. TTE-HV (HomeVent ventilation): Setpoint specification for humidity and air volume

In the first step, switch the system to constant operation (value=4) with the parameter “Ventilation operation selection” (ID=40650, function group 50=“ventilation”, function number 0=“ventilation”). You can then control the air volume with the “Normal ventilation modulation” parameter (ID=40651). The humidity is set using the “Humidity setpoint” parameter (ID=40687). If the humidity is too high, HomeVent automatically increases the ventilation modulation so that it can actually be above the set “normal ventilation modulation” value.

Note: there is also the “ventilation modulation” parameter with (ID=38606). This is calculated automatically from the current mode and other target value specifications and cannot be changed directly.

3. TTE-WEZ (e.g., heat pump): System configuration

The combination of a heat generator, one or more heating circuits, and the hot water circuit can be configured in a variety of ways. The TTE-WEZ controller (possibly with a TTE-FE function extension) is configured using numerous parameters during commissioning. The so-called hydraulic application (data point 4077 of function 0/function group 0) plays the main role. This determines the basic configuration, but can be further modified in detail using other parameters. The hydraulic applications are shown below.

Abbreviations:

  • WF1,2 - Heat generator 1, 2 sensor
  • AF - Fresh air (outside) temp. sensor
  • HK1 - Heating circuit 1
  • WW1 - Hot water circuit 1
  • SF - Hot water temp. sensor
  • MK1 - Mixer circuit pump
  • SLP - Hot water pump
  • YK1 - Heating circuit mixer
  • VF1 - Flow sensor 1
  • B1 - Flow temperature controller
  • HP2 - Main pump 2
  • AVR - Automatic plant flow control
  • YAV - Plant flow mixer
  • FAV - Plant flow sensor
  • AVP - Plant flow pump
  • RLHH - Return temperature control
  • RLF - Return sensor
  • HP - Main pump
  • YKR - Return mixer
  • Y7 - DHW switchover element