HeliosVentilation Binding

This is the binding for Helios Ventilation Systems KWL EC 200/300/500 Pro. It requires a connection to the RS485 bus used by the original remote controls KWL-FB (9417) and does not use the Modbus/TCP interface of the newer EasyControl devices.

For electrical connection it is recommended to use an USB-RS485 interface, but any RS485 interface that shows up as a serial port will do. Setup the device as described in https://www.openhab.org/docs/administration/serial.html.

The binding will use the remote control address 15 for communication, so make sure that this is not assigned to a physically present remote control.

Supported Things

There is only one thing type supported by this binding: a Helios Ventilation System KWL EC 200/300/500 Pro from Helios. The binding was developed and test on a KWL EC 200 Pro device.

Binding Configuration

The binding requires access to the serial device connecting to the RS485 bus as described in https://www.openhab.org/docs/administration/serial.html. Otherwise only thing configuration is needed.

Thing Configuration

The binding supports only one thing and requires the configuration of the serial port (typically /dev/ttyUSB0 on Linux and COM3 on Windows) and optionally the polling time which is the cycle time after which the binding tries to reconnect to the bus and requests data updates.


Supported operation channels:

channel type description
outsideTemp Number:Temperature Temperature sensor in the outside air flow
outgoingTemp Number:Temperature Temperature sensor in the outgoing air flow
extractTemp Number:Temperature Temperature sensor in the extract air flow
supplyTemp Number:Temperature Temperature sensor in the supply air flow
setTemp Number:Temperature Set temperature for supply (not always used)
fanspeed Number Level of the fanspeed (1-8)
powerState Switch Main power switch
co2State Switch Switch for CO2 regulation
rhState Switch Switch for humidity regulation
winterMode Switch Switch to set winter mode

Supported configuration channels:

channel type description
bypassTemp Number:Temperature Temperature to disable the bypass function
supplyStopTemp Number:Temperature Temperature to stop supply fan for defrosting
preheatTemp Number:Temperature Temperature to enable the preheater
minFanspeed Number Minimal level of the fanspeed (1-8)
maxFanspeed Number Maximal level of the fanspeed (1-8)
rhLimit Number:Dimensionless Limit for relative humidity sensor
hysteresis Number:Temperature Hysteresis on defroster temperature
DCFanExtract Number:Dimensionless Speed reduction for the extract fan
DCFanSupply Number:Dimensionless Speed reduction for the supply fan
maintenanceInterval Number:Dimensionless Maintenance interval in months
adjustInveral Number:Dimensionless Adjust interval in minutes for air quality
RHLevelAuto Switch Automatic base humidity determination
switchType Switch External Switch type (Boost or Fireplace)
radiatorType Switch Use water (ON) or electric (OFF) radiator
cascade Switch System is cascaded

Note: the configuration channels are not intended to be written regularly.

Full Example


heliosventilation:ventilation:MyKWL  [ serialPort="/dev/ttyUSB0" ]


Switch KWLOnOff { channel="heliosventilation:ventilation:MyKWL:powerState" }
Switch KWLWinter { channel="heliosventilation:ventilation:MyKWL:winterMode" }

Group VentilationTemp "Measured Temperatures in Ventilation System"

Number:Temperature Outside_Temperature "Outside Temperature [%.1f °C]" <temperature> (VentilationTemp) { channel="heliosventilation:ventilation:MyKWL:outsideTemp" }
Number:Temperature Outgoing_Temperature "Outgoing Temperature [%.1f °C]" <temperature> (VentilationTemp) { channel="heliosventilation:ventilation:MyKWL:outgoingTemp" }
Number:Temperature Extract_Temperature "Extract Temperature [%.1f °C]" <temperature> (VentilationTemp) { channel="heliosventilation:ventilation:MyKWL:extractTemp" }
Number:Temperature Supply_Temperature "Supply Temperature [%.1f °C]" <temperature> (VentilationTemp) { channel="heliosventilation:ventilation:MyKWL:supplyTemp" }

Number Fan_Speed "Fan Speed" <fan> { channel="heliosventilation:ventilation:MyKWL:fanspeed" }
Number Min_Fan_Speed "Min Fan Speed" <fan> { channel="heliosventilation:ventilation:MyKWL:minFanspeed" }
Number Max_Fan_Speed "Max Fan Speed" <fan> { channel="heliosventilation:ventilation:MyKWL:maxFanspeed" }


sitemap helios_kwl label="Helios Ventilation" {
        Frame label="Temperatures" {
              Text item=Outside_Temperature
              Text item=Outgoing_Temperature
              Text item=Extract_Temperature
              Text item=Supply_Temperature
        Frame label="Control" {
              Switch item=KWLOnOff
              Switch item=KWLWinter
              Slider item=Fan_Speed icon="fan" minValue=1 maxValue=8 step=1
        Frame label="Configuration" {
              Slider item=Min_Fan_Speed
              Setpoint item=Max_Fan_Speed icon="fan"