ComfoAir Binding

This binding allows to monitor and control Zehnder ComfoAir serial controlled ventilation systems via RS232 serial connection. Though the binding is developed based on the protocol description for Zehnder ComfoAir devices it should also work for mostly identical systems from different manufacturers, like StorkAir WHR930, Wernig G90-380 and Paul Santos 370 DC. It was also successfully tested on a Wernig G90-160.

NOTE: This binding does not work with the ComfoAir Q-series (e.g. Q350 or Q450). These ventilation units use a CAN bus for communication and a different protocol.

Limitations

• Either the ComfoAir binding or the CCEase Comfocontrol can be active, but not together.
• You must implement auto mode by yourself with rules, but it is more powerful.

Prerequisites

Computer communication between ComfoAir device and openHAB via RS232 connection has to be set up. The connection should be made with a 3-wire cable connecting pins: GND, TX, RX of RS232 sockets, but RX and TX pins should be crossed (TX of ComfoAir to RX of PC, RX of ComfoAir to TX of PC).

Serial Port Access Rights

• Take care that the user that runs openHAB has rights to access the serial port
• On Ubuntu/Debian based systems (incl. openHABian) that usually means adding the user (e.g. openhab) to the group "dialout", i.e.

sudo usermod -a -G dialout openhab

Supported Things

The binding supports thing types for different device types. They only differ in the available channels, where the generic comfoair thing type supports all available channels. If there is no thing type that matches your specific device you can safely choose the comfoair type.

Thing Type ID	Description
comfoair	A ComfoAir ventilation system connected via RS232 serial connection.
WHR930	Thing type restricted to the data points available for the StorkAir WHR930.

Discovery

Discovery is not supported.

Thing Configuration

For the thing creation, the appropriate serial port has to be set.

Parameter	Values	Default
serialPort	/dev/ttyUSB0, COM1, etc.	-
refreshInterval	Refresh interval in seconds (10...65535)	60

Channels

The ComfoAir binding supports the following channels.

Channel ID	Item Type	Label	Description	Read Only	Advanced
Binding Control
bindingControl#activate	Switch	Activate Binding Control	Activate (control through openHAB) or deactivate (return control to CCEase) binding control	false	no
Ventilation Values
ventilation#fanLevel	Number	Fan Level	Fan level	false	no
ventilation#fanOut0	Number	Fan Out Level 0 (away)	Fan level 0 performance (%) of outgoing fan	false	yes
ventilation#fanOut1	Number	Fan Out Level 1	Fan level 1 performance (%) of outgoing fan	false	yes
ventilation#fanOut2	Number	Fan Out Level 2	Fan level 2 performance (%) of outgoing fan	false	yes
ventilation#fanOut3	Number	Fan Out Level 3	Fan level 3 performance (%) of outgoing fan	false	yes
ventilation#fanIn0	Number	Fan In Level 0 (away)	Fan level 0 performance (%) of incoming fan	false	yes
ventilation#fanIn1	Number	Fan In Level 1	Fan level 1 performance (%) of incoming fan	false	yes
ventilation#fanIn2	Number	Fan In Level 2	Fan level 2 performance (%) of incoming fan	false	yes
ventilation#fanIn3	Number	Fan In Level 3	Fan level 3 performance (%) of incoming fan	false	yes
ventilation#fanInPercent	Number	Fan In (%)	Current relative speed (%) of incoming fan	false	yes
ventilation#fanOutPercent	Number	Fan Out (%)	Current relative speed (%) of outgoing fan	true	yes
ventilation#fanInRPM	Number	Fan In (rpm)	Current absolute speed (rpm) of incoming fan	true	yes
ventilation#fanOutRPM	Number	Fan Out (rpm)	Current absolute speed (rpm) of outgoing fan	true	yes
Temperature Values
temperatures#targetTemperature	Number:Temperature	Target Temperature	Target (comfort) temperature	false	no
temperatures#outdoorTemperatureIn	Number:Temperature	Outdoor Temperature Incoming	Intake air temperature (outside)	true	yes
temperatures#outdoorTemperatureOut	Number:Temperature	Outdoor Temperature Outgoing	Outlet air temperature (outside)	true	yes
temperatures#indoorTemperatureIn	Number:Temperature	Indoor Temperature Incoming	Inlet air temperature (inside)	true	yes
temperatures#indoorTemperatureOut	Number:Temperature	Indoor Temperature Outgoing	Uptake air temperature (inside)	true	yes
temperatures#isT1Sensor	Switch	Sensor T1 Available	Availability of temperature sensor T1 (outdoor in)	true	yes
temperatures#isT2Sensor	Switch	Sensor T2 Available	Availability of temperature sensor T2 (indoor in)	true	yes
temperatures#isT3Sensor	Switch	Sensor T3 Available	Availability of temperature sensor T3 (indoor out)	true	yes
temperatures#isT4Sensor	Switch	Sensor T4 Available	Availability of temperature sensor T4 (outdoor out)	true	yes
temperatures#isEWTSensor	Switch	GHX Sensor Available	Availability of geothermal heat exchanger temperature sensor	true	yes
temperatures#isHeaterSensor	Switch	Heater Sensor Available	Availability of heater temperature sensor	true	yes
temperatures#isCookerhoodSensor	Switch	Cookerhood Sensor Available	Availability of cookerhood temperature sensor	true	yes
temperatures#ewtTemperature	Number:Temperature	GHX Temperature	Temperature of geothermal heat exchanger sensor	true	yes
temperatures#heaterTemperature	Number:Temperature	Heater Temperature	Temperature of heater sensor	true	yes
temperatures#cookerhoodTemperature	Number:Temperature	Cookerhood Temperature	Temperature of cookerhood sensor	true	yes
Uptimes
times#level0Time	Number:Time	Level 0 duration	Uptime at level 0 (away)	true	yes
times#level1Time	Number:Time	Level 1 duration	Uptime at level 1	true	yes
times#level2Time	Number:Time	Level 2 duration	Uptime at level 2	true	yes
times#level3Time	Number:Time	Level 3 duration	Uptime at level 3	true	yes
times#freezeTime	Number:Time	Antifrost Duration	Uptime of antifrost	true	yes
times#preheaterTime	Number:Time	Preheater Duration	Uptime of preheater	true	yes
times#bypassTime	Number:Time	Bypass Duration	Hours of bypass open	true	yes
times#filterHours	Number:Time	Filter Duration	Uptime of the filter	true	no
Menu P1: Control States
menuP1#menu20Mode	Switch	Menu 20 Mode (P10)	State of menu 20 mode (P10)	true	yes
menuP1#menu21Mode	Switch	Menu 21 Mode (P11)	State of menu 21 mode (P11)	true	yes
menuP1#menu22Mode	Switch	Menu 22 Mode (P12)	State of menu 22 mode (P12)	true	yes
menuP1#menu23Mode	Switch	Menu 23 Mode (P13)	State of menu 23 mode (P13)	true	yes
menuP1#menu24Mode	Switch	Menu 24 Mode (P14)	State of menu 24 mode (P14)	true	yes
menuP1#menu25Mode	Switch	Menu 25 Mode (P15)	State of menu 25 mode (P15)	true	yes
menuP1#menu26Mode	Switch	Menu 26 Mode (P16)	State of menu 26 mode (P16)	true	yes
menuP1#menu27Mode	Switch	Menu 27 Mode (P17)	State of menu 27 mode (P17)	true	yes
menuP1#menu28Mode	Switch	Menu 28 Mode (P18)	State of menu 28 mode (P18)	true	yes
menuP1#menu29Mode	Switch	Menu 29 Mode (P19)	State of menu 29 mode (P19)	true	yes
Menu P2: Delay Settings
menuP2#bathroomStartDelay	Number	Menu P21	Start delay for bathroom switch (min)	false	yes
menuP2#bathroomEndDelay	Number	Menu P22	End delay for bathroom switch (min)	false	yes
menuP2#L1EndDelay	Number	Menu P23	End delay for L1 switch (min)	false	yes
menuP2#pulseVentilation	Number	Menu P27	Period for pulse ventilation (min)	false	yes
menuP2#filterWeeks	Number	Menu P24	Usage period until filter pollution message (weeks)	false	yes
menuP2#RFShortDelay	Number	Menu P25	End delay (RF short actuation) for ventilation level 3 (min)	false	yes
menuP2#RFLongDelay	Number	Menu P26	End delay (RF long actuation) for ventilation level 3 (min)	false	yes
menuP2#cookerhoodDelay	Number	Menu P20	End delay for cooker hood control (min)	false	yes
Menu P9: Option States
menuP9#chimneyState	Switch	Chimney Control State	State of the chimney control	true	yes
menuP9#bypassState	Switch	Bypass State	State of the bypass (ON = open / OFF = closed)	true	yes
menuP9#ewtState	Switch	GHX State	State of the geothermal heat exchanger valve (ON = open / OFF = closed)	true	yes
menuP9#heaterState	Switch	Heater State	State of the heater	true	yes
menuP9#vControlState	Switch	0-10V Control State	State of the 0-10V control	true	yes
menuP9#frostState	Switch	Antifrost State	State of the antifrost control	true	yes
menuP9#cookerhoodState	Switch	Cookerhood State	State of the cookerhood control	true	yes
menuP9#enthalpyState	Switch	Enthalpy State	State of the enthalpy module	true	yes
Error States
errors#filterError	Switch	Filter Error	Filter full	true	no
errors#errorsCurrent	String	Errors Current	Current errors	true	no
errors#errorsLast	String	Errors Last	Last errors	true	yes
errors#errorsPrelast	String	Errors Prelast	Prelast errors	true	yes
errors#errorsPrePrelast	String	Errors Pre-Prelast	Pre-Prelast errors	true	yes
Bypass Values
bypass#bypassFactor	Number	Bypass Factor	Bypass factor value	true	yes
bypass#bypassLevel	Number	Bypass Level	Bypass level state	true	yes
bypass#bypassCorrection	Number	Bypass Correction	Bypass correction state	true	yes
bypass#bypassSummer	Switch	Bypass Summer Mode	Bypass summer mode	true	yes
Preheater Values
preheater#preheaterValve	Number	Preheater Valve	State of the preheater valve	true	yes
preheater#preheaterFrostProtect	Switch	Frost Protection	State of the frost protection	true	yes
preheater#preheaterHeating	Switch	Preheater	State of the preheater	true	yes
preheater#preheaterFrostTime	Number	Preheater Frost Time	Frost minutes	true	yes
preheater#preheaterSafety	Number	Preheater Frost Safety	Frost safety setting	true	yes
GHX Values
ewt#ewtTemperatureLow	Number:Temperature	GHX Temperature (low)	Lower temperature of the geothermal heat exchanger	true	yes
ewt#ewtTemperatureHigh	Number:Temperature	GHX Temperature (high)	Upper temperature of the geothermal heat exchanger	true	yes
ewt#ewtSpeed	Number	GHX Speed Up (%)	Speed up of the geothermal heat exchanger	true	yes
Heater Values
heater#heaterPower	Number	Heater Power	Heater power value	true	yes
heater#heaterPowerI	Number	Heater Power I-parameter	Heater power I-parameter value	true	yes
heater#heaterTargetTemperature	Number:Temperature	Heater Target Temperature	Target temperature of the heater	true	yes
Cookerhood Values
cookerhood#cookerhoodSpeed	Number	Cookerhood Speed Up (%)	Speed up of the cookerhood	true	yes
Enthalpy Values
enthalpy#enthalpyTemperature	Number:Temperature	Enthalpy Sensor Temperature	Temperature of the enthalpy sensor	true	yes
enthalpy#enthalpyHumidity	Number	Enthalpy Sensor Humidity	Humidity of the enthalpy sensor	true	yes
enthalpy#enthalpyLevel	Number	Enthalpy Sensor Level	Level of the enthalpy sensor	true	yes
enthalpy#enthalpyTime	Number	Enthalpy Sensor Timer	Timer state of the enthalpy sensor	true	yes
Option Settings
options#isPreheater	Switch	Preheater	Preheater option installed	true	yes
options#isBypass	Switch	Bypass	Bypass option installed	true	yes
options#recuType	Number	ComfoAir Type	Type of the ComfoAir (1 = left / 2 = right)	true	yes
options#recuSize	Number	ComfoAir Size	Size of the ComfoAir (1 = big / 2 = small)	true	yes
options#isChimney	Switch	Chimney	Chimney option installed	true	yes
options#isCookerhood	Switch	Cookerhood	Cookerhood option installed	true	yes
options#isHeater	Switch	Heater	Heater option installed	true	yes
options#isEnthalpy	Number	Enthalpy	Enthalpy option installed	true	yes
options#isEWT	Number	Geothermal Heat Exchanger	Geothermal heat exchanger option installed	true	yes
options#analogPriority	Number	Analog Priority	Priority of analog inputs for highest fan level	true	yes
Inputs
inputs#isL1Switch	Switch	L1 Switch	Availability of L1 step switch	true	yes
inputs#isL2Switch	Switch	L2 Switch	Availability of L2 step switch	true	yes
inputs#isBathroomSwitch	Switch	Bathroom Switch	Availability of bathroom switch	true	yes
inputs#isCookerhoodSwitch	Switch	Cookerhood Switch	Availability of cookerhood switch	true	yes
inputs#isExternalFilter	Switch	External Filter	Availability of external filter	true	yes
inputs#isWTW	Switch	Heat Recovery	Availability of heat recovery (WTW)	true	yes
inputs#isBathroom2Switch	Switch	Bathroom Switch 2	Availability of bathroom switch 2 (luxe)	true	yes
Resets
resets#filterReset	Number	Filter Reset	Reset filter uptime	false	no
resets#errorReset	Number	Error Reset	Reset errors	false	no
Analog Inputs [1-4]
analog[1-4]#isAnalog	Switch	Analog Input Availability	Availability of analog input [1-4]	false	yes
analog[1-4]#analogMode	Switch	Analog Input State	State of analog input [1-4]	false	yes
analog[1-4]#analogNegative	Switch	Analog Input Postive/Negative	Postive/Negative state of analog input [1-4]	false	yes
analog[1-4]#analogVolt	Number:ElectricPotential	Analog Input Voltage Level	Voltage level of analog input [1-4]	false	yes
analog[1-4]#analogMin	Number	Analog Input Min	Minimum setting for analog input [1-4]	false	yes
analog[1-4]#analogMax	Number	Analog Input Max	Maximum setting for analog input [1-4]	false	yes
analog[1-4]#analogValue	Number	Analog Input Target	Target setting for analog input [1-4]	false	yes
RF Input
analogRF#isRF	Switch	RF Input Availability	Availability of RF input	false	yes
analogRF#RFMode	Switch	RF Input State	State of RF input	false	yes
analogRF#RFNegative	Switch	RF Input Postive/Negative	Postive/Negative state of RF input	false	yes
analogRF#RFMin	Number	RF Input Min	Minimum setting for RF input	false	yes
analogRF#RFMax	Number	RF Input Max	Maximum setting for RF input	false	yes
analogRF#RFValue	Number	RF Input Target	Target setting for RF input	false	yes
analogRF#analogPriority	Number	Analog Priority	Priority of control	false	yes

Full Example

.things file:

Thing comfoair:comfoair:myComfoAir "ComfoAir" [serialPort="/dev/ttyUSB0", refreshInterval="60"]

.items file:

Switch comfoairControl    "Activate"     <computer> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:bindingControl#activate"}
Number comfoairFanLevel   "Ventilation level [%d]"   <chart>  (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:ventilation#fanLevel"}
Number comfoairErrorReset   "Error reset"     <service> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:resets#errorReset"}
Number comfoairFilterReset   "Filter reset"     <service> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:resets#filterReset"}
Number comfoairFilterPeriod   "Filter period [%d weeks]"   <clock>  (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP2#filterWeeks"}

// Messages
String  comfoairError   "Error: [%s]"   (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:errors#errorsCurrent"}
Number:Time comfoairFilterRuntime  "Filter runtime [%.0f h]" (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:times#filterHours"}

// State
Number:Temperature comfoairTargetTemperature  "Comfort temperature [%.1f °C]"   <temperature> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:temperatures#targetTemperature"}
Number:Temperature comfoairOutdoorIncomingTemperature "Inlet air temperature [%.1f °C]"  <temperature> (ComfoAir, comfoairTemps_Chart) {channel="comfoair:comfoair:myComfoAir:temperatures#outdoorTemperatureIn"}
Number:Temperature comfoairIndoorIncomingTemperature "Supply air temperature [%.1f °C]"  <temperature> (ComfoAir, comfoairTemps_Chart) {channel="comfoair:comfoair:myComfoAir:temperatures#indoorTemperatureIn"}
Number:Temperature comfoairIndoorOutgoingTemperature "Return air temperature [%.1f °C]"  <temperature> (ComfoAir, comfoairTemps_Chart) {channel="comfoair:comfoair:myComfoAir:temperatures#indoorTemperatureOut"}
Number:Temperature comfoairOutdoorOutgoingTemperature "Exhaust air temperature [%.1f °C]"  <temperature> (ComfoAir, comfoairTemps_Chart) {channel="comfoair:comfoair:myComfoAir:temperatures#outdoorTemperatureOut"}
Number comfoairIncomingFan   "Supply capacity [%d %%]"   <fan_in> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:ventilation#fanInPercent"}
Number comfoairOutgoingFan   "Exhaust capacity [%d %%]"   <fan_out> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:ventilation#fanOutPercent"}
Number comfoairFanIn0    "Supply capacity - level 0 [%d %%]"  <fan_in> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:ventilation#fanIn0"}
Number comfoairFanOut0    "Exhaust capacity - level 0 [%d %%]"  <fan_out> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:ventilation#fanOut0"}
Switch comfoairBypassMode   "Bypass [MAP(comfoair_bypass.map):%s]"  <climate> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP9#bypassState"}
Switch comfoairGHXMode    "GHX [MAP(comfoair_on-off.map):%s]"  <climate> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP9#ewtState"}
Switch comfoairChimneyMode   "Fire programme [MAP(comfoair_on-off.map):%s]" <climate> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP9#chimneyState"}
Switch comfoairHeaterMode   "Heater [MAP(comfoair_on-off.map):%s]"  <climate> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP9#heaterState"}
Switch comfoairCookerHoodMode   "Extractor hood [MAP(comfoair_on-off.map):%s]" <climate> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP9#cookerhoodState"}
Switch comfoairEnthalpyMode   "Enthalpy [MAP(comfoair_on-off.map):%s]" <climate> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP9#enthalpyState"}
Switch comfoairFreezeMode   "Freeze [MAP(comfoair_freeze.map):%s]"  <climate> (ComfoAir)   {channel="comfoair:comfoair:myComfoAir:menuP9#frostState"}

.sitemap file:

sitemap comfoair label="ComfoAir" {
 Frame label="Main" {
  Text item=comfoairError labelcolor=[!="No Errors"="red"] valuecolor=[!="No Errors"="red"]
  Switch item=comfoairControl mappings=[OFF="CCEase", ON="Computer"]
  Switch item=comfoairErrorReset mappings=[1="Reset"]
  Switch item=comfoairFilterReset mappings=[1="Reset"]
 }
 Frame label="Control" {
  Selection item=comfoairFanLevel
  Setpoint item=comfoairTargetTemperature step=0.5 minValue=15 maxValue=28 valuecolor=["black"]
 }
 Frame label="State" {
  Text item=comfoairOutdoorIncomingTemperature valuecolor=["black"]
  Text item=comfoairOutdoorOutgoingTemperature valuecolor=["black"]
  Text item=comfoairIndoorIncomingTemperature valuecolor=["black"]
  Text item=comfoairIndoorOutgoingTemperature valuecolor=["black"]
 }
 Frame {
  Text item=comfoairIncomingFan valuecolor=["black"]
  Text item=comfoairBypassMode valuecolor=["black"]
  Text item=comfoairOutgoingFan valuecolor=["black"]
  Text item=comfoairGHXMode valuecolor=[OFF="silver", ON="black"]
  Text item=comfoairEfficiency valuecolor=["black"]
  Text item=comfoairFreezeMode valuecolor=[OFF="black", ON="red"]
  Text item=comfoairFilterRuntime_Message valuecolor=["black"]
  Text item=comfoairChimneyMode valuecolor=[OFF="silver", ON="black"]
 }
}

comfoair_bypass.map file:

ON=Opened
OFF=Closed
undefined=unknown
-=unknown

comfoair_on-off.map file:

ON=active
OFF=inactive
undefined=unknown
-=unknown

comfoair_freeze.map file:

ON=frozen
OFF=OK
undefined=unknown
-=unknown

Control Protocol Reference

For reference the protocol description used can be found here (german version only): Protokollbeschreibung Zehnder ComfoAir (opens new window)

Caught a mistake or want to contribute to the documentation? Edit this page on GitHub (opens new window)