Zehnder Rittling ComfoConnect KNX C User manual

ComfoConnect KNXC
Manual
Cooling Fresh Air Clean AirHeating

12 - EN
Foreword
Read this document carefully before use.
With this document you can install, commission and
perform maintenance on the ComfoConnect KNX
in a safe and optimal manner. In this document the
ComfoConnect KNX will be referred to as “the unit”.
The unit is subject to continuous development and
improvement. Thus the unit may be slightly different
from the given descriptions.
The next pictograms are used in the Zehnder
documents:
Symbol Meaning
Point of interest.
Risk of compromised performance or damage of
the ventilation system.
Risk of personal injury.
Questions
Speak to your supplier when you have any questions
or would like to order a new document. The contact
details of the manufacturer can be found on the back
page of this document.
Electrical dangers
There is a risk of electric shock during installation
or maintenance. Always comply with the safety
regulations in this manual. Personal injury or
damage to the unit can arise from non-compliance
with the safety regulations, warnings, comments
and instructions in this manual. Disconnect the
power supply to the ComfoAir Q, Comfort Vent Q or
AERISnext (hereinafter referred to as the “ventilation
unit”) before connecting up or removing something
from the unit.
All rights reserved.
This documentation has been made with the utmost care. The publisher cannot be held liable for any damage
caused as a result of missing or incorrect information in this document. In case of disputes the English version of
the instructions will be binding.

12 - EN EN - 13
Table of Contents
Foreword.................................................................................................................................................................... 12
1 Introduction ................................................................................................................................................................ 14
2 Using the ComfoConnect KNX C ................................................................................................................................. 14
2.1 LED behavior during normal use ........................................................................................................................... 15
2.2 Reset.................................................................................................................................................................. 15
2.3 Factory Reset...................................................................................................................................................... 15
2.4 Firmware update.................................................................................................................................................. 15
3 Guarantee.................................................................................................................................................................. 15
4 Technical Specifications.............................................................................................................................................. 16
5 Installation.................................................................................................................................................................. 17
6 Commissioning........................................................................................................................................................... 17
6.1 Group Objects .................................................................................................................................................... 18
6.2 Parameters ......................................................................................................................................................... 20
6.3 Auto/Manual mode.............................................................................................................................................. 20
7 Maintenance .............................................................................................................................................................. 21
8 Troubleshooting.......................................................................................................................................................... 21

14 - EN
1 Introduction
The unit provides the connection between the home
ventilation unit and the KNX building automation
infrastructure. The unit can be combined with the
home ventilation unit ComfoAir Q, Comfort Vent Q
or the AERISnext. As a result, one ventilation unit
can be controlled and monitored by KNX devices via
the unit. Additionally, the unit allows basic control
over an optionally connected ComfoCool and
ComfoHood.
KNX
ComfoControl App
ComfoConnect
LAN C
ComfoConnect
KNX C
ComfoFond-L Q
Post-heater
External
sensors
Option Box
RFZ &
RFZ &
RF-
RF-
T
imer
ComfoSense C
ComfoSense C
ComfoSwitch C
Display
ComfoCool Q
1
2
3
5
4
The unit can be wall mounted, with the power supply
coming from the ventilation unit via the 4-core
ComfoNet cable.
#Description
1ComfoNet
Protocol over a combined serial bus with a +12V DC power
supply.
2Ventilation unit
Supplies +12V to ComfoNet and all its connected nodes.
3ComfoConnect LAN C
Connects ComfoNet to the Internet and the ComfoControl
App, for monitoring the ventilation unit and firmware
updates of the ventilation unit and ComfoConnect KNX C.
4ComfoConnect KNX C
There can only be one ComfoConnect KNX C connected
to ComfoNet.
5The KNX setup
2 Using the ComfoConnect KNX C
5
6
7
8
1
2
9
3
4
#Description
1KNX-TP bus connector
2Primary* connection to ComfoNet, including +12V DC
3Secondary* connection to ComfoNet, including +12V DC.
4Factory reset button to revert all unit settings back
to factory default. The button is only accessible by
inserting a pin or paperclip into the little hole.
5Status indicator LEDs
6Reset button to power-cycle the unit
7Programming mode button for downloading the KNX
application
8Wall mount
9Cable lead-through and pull relief including wall fixture
* The two connections can be used as so-called ‘feed-through/
chain’ connection to connect multiple nodes to ComfoNet.

14 - EN
EN - 15
2.1 LED behaviour during normal use
LED State Description
activity off There is no ventilation unit detected on ComfoNet.
on The unit successfully established a connection to the ventilation unit.
flashing There is communication between KNX and the ventilation unit. When the power LED is blinking too,
this indicates that the firmware is currently being updated.
blinking once per
second
There is an error in the setup of ComfoNet.
KNX Off The KNX bus is not connected or the application cannot be loaded successfully.
On KNX is operational.
blinking once per
second
The programming mode button has been pressed, and the unit is now in programming mode (to be
used by ETS).
blinking eight times per
second
The unit is programmed by ETS or factory default settings are restored.
ComfoNet Off ComfoNet is disconnected.
On ComfoNet is operational.
blinking once per
second
ComfoNet is initialising.
blinking eight times per
second
A communication error has been detected on ComfoNet.
Power off The unit has no power or cannot boot the firmware.
on The unit has power.
blinking once per
second
The unit is in firmware update mode.
2.2 Reset
To reboot the unit, press and release the reset
button. The unit restarts, initialises ComfoNet
and KNX, and tries to discover and connect to
the ventilation unit. This process takes around 15
seconds. After successful initialisation, all LEDs
should be on (the activity LED may flash).
2.3 Factory Reset
To revert the KNX configuration of the unit back to
factory defaults, press and hold the factory reset
button till the KNX LED starts blinking fast. Release
the factory reset button. The settings are restored
and the unit will reboot.
After performing a factory reset, the unit must be
reconfigured using ETS.
2.4 Firmware update
A firmware update can be done by connecting
a ComfoConnect LAN C and using the ‘Zehnder
ComfoControl’ App from the Apple App Store or
Google Play Store. Follow the instructions on the
App to update the ComfoConnect KNX C. The
firmware cannot be updated via KNX.
3 Guarantee
The unit is covered by the manufacturers warranty
for a period of 24 months following installation, and
up to a maximum of 30 months following the date of
manufacture.
The warranty is rendered invalid if:
�installation of the unit was not carried out in
accordance with the proper instructions;
�defects have occurred due to incorrect
connection, incompetent use or contamination of
the system;
�spare parts used that were not originally
supplied by the manufacturer, or repairs done by
unauthorised persons.
The costs associated with dismantling and
reinstalling at the location are not covered by the
warranty. This also applies to normal wear and tear.
The manufacturer retains the right to change and/
or reconfigure its products at any time without any
obligation to alter previously delivered products.

16 - EN
4 Technical Specifications
Electrical
Nominal input voltage +12 V DC
Input voltage range +12 V DC ± 20%
Nominal input current 0.02 A
Electrical separation 1500 V AC (60 sec)
Nominal power consumption (ComfoNet) 0.25 W
Maximum power consumption (ComfoNet) 0.5 W
Maximum loop-through current 3.20 A
Nominal KNX bus current 12 mA
Environmental
Operating temperature -20 °C to +60 °C
Storage and transportation temperature -40 °C to +80 °C
Humidity < 95% (non-condensing)
Level of protection IP classification 30
Contamination level PD3 (boiler room)
Flammability rating of connectors UL 94 V0
Flammability rating of housing UL 94 HB (< 20 J)
Flammability rating of PCB UL 94 V0
Housing material ABS
Weight 90 g
Standards
Safety EN 60950-1
Electromagnetic Compatibility (EMC) EN 55022
EN 61000-6-3
EN 61000-6-1
EN 50491-5-1
EN 50491-5-2
KNX ISO/IEC 14543-3-10
KNX Certified
Environmental and surroundings requirements RoHS
REACH
WEEE
KNX
Medium Twisted-pair (TP)
Device model System B
Supported configuration mode S-Mode
Supported ETS version 5

16 - EN
EN - 17
5 Installation
1. Disconnect the power from the ventilation unit
before installing equipment. Always observe the
local safety regulations.
2. Mount the ComfoConnect KNX C on the wall,
preferably near the ventilation unit.
3. Connect KNX according to the +/- indication on
the housing.
4. Connect the 4-wire ComfoNet cable to one of the
ComfoNet connectors according to the indicated
wire colouring. The ComfoNet cable has to comply
to the following requirements:
�Maximum length: 50 m;
�Number of wires: 2x2 (twisted pair);
�Not shielded;
�Core: rigid (solid) wire for insertion elements;
�Colours: preferably compatible with the
connectors;
�Minimum ø: 0.2 mm2
�Optimum: DIN VDE 0281: J-Y(St)Y 2x2x0.6;
�Maximum ø: 1.5 mm2
5. Optionally, connect a second ComfoNet cable
to the other ComfoNet connector for combining
other ComfoNet devices.
6. Mount the pull relief to the wall and use it as a
cable opening for all cables to and from the unit.
This prevents the cables from being pulled out of
the equipment.
7. Connect (one of) the ComfoNet cable(s) to the
ventilation unit.
8. Turn on power on the KNX bus, if it is not turned
on already.
9. Turn on the power of the ventilation unit, which will
in turn supply power to ComfoNet and the unit.
6 Commissioning
1. Download and install ETS5 from www.knx.org.
2. Download the Zehnder KNX library from your
country website. See back page.
3. Complete commissioning of the ventilation unit as
described in its manual.
4. Install the unit as defined in the previous chapter.
Make sure that the ventilation unit (and therefore
ComfoNet) has been powered on and the
ComfoNet LED is lit. The activity LED should be
on or flashing once in a while, but not steadily
blinking once per second.
5. The factory default settings do not include a KNX
configuration. Hence, the unit will not have a KNX
device address or group object configuration
upon first configuration. Use ETS5 to define a
KNX project. See the object list in the chapter
“Group Objects” for a description of the interface
of the unit. You have the option to decide
whether…
a. …the ventilation unit has to run its own
schedule, and KNX observes the state
(Auto mode, see chapter “Group Objects’).
In this case, e.g. the ventilation preset and
temperature setpoint are determined by the
ventilation unit. Refer to the manual of the
ventilation unit how to configure its schedule.
b. …the ventilation unit is a slave to KNX,
in which a KNX device determines and
communicates e.g. the ventilation preset and
temperature setpoint to the ventilation unit
(Manual mode). The internal scheduler of the
ventilation unit is disabled.
The choice between the two modes depends on
how the ventilation unit is to be integrated in the
KNX setup. See chapter “Auto mode” for the exact
difference of using Auto or Manual mode.
6. In order to download the application, as defined
in ETS, press the programming mode button.
The KNX LED will start blinking slowly. During
download, the KNX LED blinks quickly. After
download, or when the programming mode button
is pressed again, the unit exits programming
mode.
7. Verify correct behaviour of the configured KNX
setup.

18 - EN
6.1 Group Objects
The group objects that are indicated with ‘(set)’ are write-only objects to control the ComfoConnect KNX C and/or
the ventilation unit. All other objects (without ‘(set)’) are read-only objects to retrieve the current value. The default
flags of the write-only objects are C-WTUI and the default flags for read-only objects are CR-T--.
When the I (Read On Init) flag is set, also set the T (Transmit) flag.
Object Description Type2
Ventilation Preset1�0: Lowest ventilation preset; implies that Away function is enabled;
�1, 2, 3: Ventilation preset; implies that Away function is disabled.
5.010
Ventilation Preset1(set)
Ventilation Preset Away Enabled/triggered when Ventilation Preset is (set to) 0. 1.001
1.017
Ventilation Preset 1 Enabled/triggered when Ventilation Preset is (set to) 1.
Ventilation Preset 2 Enabled/triggered when Ventilation Preset is (set to) 2.
Ventilation Preset 3 Enabled/triggered when Ventilation Preset is (set to) 3.
Ventilation Preset Away (set) Sets Ventilation Preset to 0. 1.001
1.017
Ventilation Preset 1 (set) Sets Ventilation Preset to 1.
Ventilation Preset 2 (set) Sets Ventilation Preset to 2.
Ventilation Preset 3 (set) Sets Ventilation Preset to 3.
Auto mode �Disable: Manual mode;
�Enable: Auto mode.
1.003
Auto mode (set)
Temperature profile mode1�0: adaptive1;
�1: fixed1;
�2: use the External setpoint object to control the temperature setpoint of the ventilation unit,
instead of using the Temperature profile.
5.010
Temperature profile mode1
(set)
Temperature profile1�0: normal profile;
�1: cool profile;
�2: warm profile.
Setting the Temperature profile only has effect when Temperature profile mode is set to 0 or 1.
5.010
Temperature profile1(set)
External setpoint Temperature setpoint of the air within the building (=the temperature of the extract air or the value
measured by a room temperature sensor if available). The ventilation unit may preheat or temper
the air in order to reach the specified setpoint.
Setting the External setpoint only has effect when Temperature profile mode is set to 2.
5.001
9.001
9.002
9.027
External setpoint (set)
Boost1�Off: normal;
�On: boost enabled (implies that Ventilation Preset is 3).
1.001
Boost1(set) When triggered, Boost is enabled for the time specified by Boost time. 1.017
Boost time Boost time in seconds.
The value 65535 s (about 18.2 hours) is interpreted as 24 hours. This object is only used to
configure the Boost upon triggering; it does not indicate the remaining time Boost is on.
7.0 05
Boost time (set)
Away function1�Off: implies a Ventilation preset of 1 or higher;
�On: implies a Ventilation preset of 0, and ComfoCool is off.
1.001
Away function1(set)
ComfoCool1Off: the ComfoCool is always off, regardless of the required temperature setpoint;
On: let the ventilation unit decide whether the ComfoCool has to be enabled.
1.001
ComfoCool1(set)
Standby Off: normal operation;
On: the ventilation unit is in service mode; ventilation may be suspended.
1.001
ComfoHood1Current state of the ComfoHood. 1.001
Airflow1Reflects the supply air fan of the ventilation unit. (FAN_SUP) 5.001
9.025
13.002
1 Refer to the manual of the ventilation unit for a description of this functionality.
2When multiple types are indicated, the actual type can be configured by a parameter. See chapter ‘Parameters’

18 - EN EN - 19
Object Description Type2
Room temperature1Reflects the room temperature sensor which is connected to the ventilation unit (if available) 5.001
9.001
9.002
9.027
Extract temperature1Reflects the extract air sensor of the ventilation unit (SENSOR_ETA).
Exhaust temperature1Reflects the exhaust air sensor of the ventilation unit. (SENSOR_EHA)
Outdoor temperature1Reflects the outdoor air sensor of the ventilation unit.( SENSOR_ODA)
Supply temperature1Reflects the supply air sensor of the ventilation unit. (SENSOR_SUP)
Room humidity1Reflects the room humidity sensor which is connected to the ventilation unit (if available) 5.001
5.004
9.007
Extract humidity1Reflects the extract air sensor of the ventilation unit (HUMID_ETA).
Exhaust humidity1Reflects the exhaust air sensor of the ventilation unit. (HUMID_EHA)
Outdoor humidity1Reflects the outdoor air sensor of the ventilation unit.( HUMID_ODA)
Supply humidity1Reflects the supply air sensor of the ventilation unit. (HUMID_SUP)
CO2sensor bedroom (up to
8 rooms)
External CO2sensor input.
This object has to be connected to a KNX sensor that is mounted in a bedroom. Depending on
the measured CO2level, the ComfoConnect KNX C forces the ventilation unit to run at a minimum
ventilation preset.
�< 800 ppm: set to ventilation preset 1 at least;
�≥ 800 ppm: set to ventilation preset 2 at least.
9.008
CO2sensor bedroom (set)
(up to 8 rooms)
CO2sensor room
(up to 8 rooms)
External CO2sensor input.
This object has to be connected to a KNX sensor that is mounted in another room other than a
bedroom. Depending on the measured CO2level, the ComfoConnect KNX C forces the ventilation
unit to run at a minimum ventilation preset.
�< 800 ppm: set to ventilation preset 1 at least;
�≥ 800 and < 1200 ppm: set to ventilation preset 2 at least;
�≥ 1200 ppm: set to ventilation preset 3 at least.
CO2sensor room (set)
(up to 8 rooms)
Humidity sensor bathroom
(up to 8 rooms)
External humidity sensor input.
This object has to be connected to a KNX sensor that is mounted in a bathroom. Depending on the
measured humidity level, the ComfoConnect KNX C forces the ventilation unit to run at a minimum
ventilation preset.
�< 35%: set to ventilation preset 1 at least;
�≥ 35%: set to ventilation preset 2 at least.
5.001
5.004
9.007
Humidity sensor bathroom
(set)
(up to 8 rooms)
Error1�False: all systems are operational;
�True: the ventilation unit reported an error. Manual inspection and/or intervention is required.
Check the error that is indicated on the display of the ventilation unit.
1.002
Filter replace1Hours till the ventilation units filter needs replacement. 7.0 07
Filter dirty1�False: the ventilation units filters do not need replacing at this moment;
�True: the ventilation units filters need replacing.
1.002
State State/error of the unit:
�0: a connection with the ventilation unit has been established, no error;
�30: another unit is detected; this unit is not connected to the ventilation unit;
�40: incompatible ventilation unit version detected; cannot connect to the ventilation unit;
�50: no ventilation unit detected.
For safety, when the state of the unit has any other value than 0, the Error object is set to True and
Standby is set to On.
5.001
1 Refer to the manual of the ventilation unit for a description of this functionality.
2When multiple types are indicated, the actual type can be configured by a parameter. See chapter ‘Parameters’

20 - EN
6.2 Parameters
Category Parameter Description
Status/Control Type of Ventilation Preset objects This parameter enables either the switch or trigger Ventilation Preset
group objects. Choose either type that matches your KNX application.
Limit of sending to Group Addresses (default:
600 telegrams per minute)
To prevent bus overload, limit all updates to group addresses using
an average transmission rate. When the value is increased, the
ComfoConnect KNX C (and therefore the ventilation unit) may have a lower
latency in updating group objects, but may overload the bus when there is
already high traffic. When the value is decreased, bus traffic by the unit is
kept low, at the expense of possibly higher latencies.
Sensors Unit of Temperature sensor/setpoint data Enables all temperature-related objects that use °C, °F, K or a raw value
format.
Unit of Airflow sensor data Enables the Airflow object that uses either l/h, m3/h or a raw value format.
Unit of Humidity sensor data Enables all humidity-related objects that use a specific humidity format.
Number of bedrooms Enables the given number of CO2level bedroom sensor objects.
Number of (habitable) rooms Enables the given number of CO2level room sensor objects.
Number of bathrooms Enables the given number of humidity level bathroom sensor objects.
6.3 Auto/Manual mode
The ventilation unit can be set to Auto mode, such that it determines the preset autonomously, or to Manual mode,
such that KNX gains more control over the ventilation units behaviour. Enabling or disabling Auto mode influences
other group objects as specified in the table below. Group objects that are not mentioned in the table below,
behave identically regardless whether Auto mode is set or not. Whether Auto mode is enabled or not, cannot be
configured on the ventilation unit; the ComfoConnect KNX C will override any change.
Object Auto mode disabled (KNX has full control) Auto mode enabled
Ventilation Preset (set) When set, the Ventilation Preset of the ventilation unit
is changed.
Setting the Ventilation Preset has no effect.
Ventilation Preset Away (set)
Ventilation Preset 1 (set)
Ventilation Preset 2 (set)
Ventilation Preset 3 (set)
Boost When Boost is turned on by the ventilation unit, but it
was not requested by KNX, the ComfoConnect KNX
C will force it off again. However, when KNX triggered
Boost, the ventilation unit decides when to turn off
Boost again (usually when the Boost time expires).
Boost can be turned on and off by the ventilation unit.
Boost time When the Boost time is changed by the ventilation unit,
the ComfoConnect KNX C resets it to the value given
by KNX.
The Boost time can be set on/by the ventilation unit.
When it is set, it communicates to KNX.
Away function The ComfoConnect KNX C keeps enforcing the Away
function as set by KNX.
The ventilation unit may switch on or off the Away
function by itself, depending on its schedule, for
example.
ComfoCool The ComfoConnect KNX C keeps enforcing the
ComfoCool setting as set by KNX.
The ventilation unit may switch on or off the
ComfoCool by itself, depending on its schedule, for
example.
ComfoHood When Away mode is disabled, Boost is triggered when
the ComfoHood is on. The Boost time is taken into
account when the ComfoHood is turned off.
Let the ventilation unit decide how to handle the
ComfoHood with respect to Boost.

20 - EN EN - 21
7 Maintenance
Remove dust regularly from the ComfoConnect KNX
C with a dry duster.
8 Troubleshooting
The ComfoNet LED blinks quickly.
This indicates an electrical (connection) problem
with ComfoNet. Check the ComfoNet cabling,
connections, and connected nodes. When the
problem is resolved, the unit will automatically
reconnect to ComfoNet to continue normal
operation.
The KNX LED remains off.
This indicates a disconnected or unpowered KNX
bus. Check the KNX cabling, connections, and KNX
bus supply power. This is not related to configuration
by ETS.
After a firmware update, the ComfoConnect KNX
C does not behave properly.
When an error in the firmware prevents further
firmware updates, you can force the ComfoConnect
KNX C into update mode. For this, press and hold
the programming mode button and press and
release the reset button. The ComfoConnect KNX
C reboots to update mode. Retry to update the
firmware.
After a firmware update, all LEDs of the
ComfoConnect KNX C remain off.
Make sure the ComfoConnect KNX C has power. If
the problem still persists, a full factory reset can be
performed. For this, press and hold both the factory
reset button and the programming mode button.
Press and release the reset button. Release all other
buttons. The firmware and settings are erased,
and the ComfoConnect KNX C reboots to update
mode. Afterwards, a firmware update and KNX
configuration by ETS is required.
The Activity LED blinks once per second.
The unit has encountered an error. Use ETS to read
the State object to get the error code. Try to resolve
the issue accordingly.
KNX devices cannot change the Ventilation
Preset of the ventilation unit.
Try the following steps:
�Check if all LEDs are lit. Only the Activity LED may
flash once in a while. If this is not the case, check
the cabling and ComfoNet configuration.
�Check if the unit has been configured using
ETS. Check that the group objects are assigned
to the correct groups and that they have the
correct C/R/W/T/U flags. Based on the LED
behaviour, you cannot determine whether the KNX
configuration is correct, as this depends on the
needs and requirements of the KNX installation.
�Check if the other KNX devices are also assigned
to the proper group addresses.
The ventilation unit does not respond to settings,
and the State object has the value 40.
An incompatible ventilation unit firmware version
has been detected. Check online for an update of
either the ComfoConnect KNX or the ventilation unit.
Update one of the devices in order to match the
correct firmware version.