Paul FOCUS 200 Base Quick start guide

Translation of the original instruction manual
Heat Recovery Unit
FOCUS (F) 200

Legal regulations
All rights reserved.
This instruction manual has been compiled with the utmost care. Nevertheless, the publisher accepts no liability for
damage caused by missing or incorrect details in this instruction manual. We reserve the right at any time and without
previous notification to change the content of this manual in part or as a whole.
The information contained in these documents is the property of Zehnder Group. Any form of publication, whether in
whole or in part, requires the written approval of Zehnder Group. In-house duplication, designated for the evaluation
of the product or for proper use, is permitted and not subject to approval.
Trademarks
All trademarks are recognised, even if they are not separately labelled. A missing label does not mean that an article
or sign is free of trademark rights.
© 2022 Zehnder Group

3
Contents
1Introduction .............................................................................................................................................. 5
General ...................................................................................................................................................... 5
Validity ....................................................................................................................................................... 5
Target groups............................................................................................................................................. 5
Qualification of target group ....................................................................................................................... 5
1.3.1.1 Users.......................................................................................................................................................... 5
1.3.1.2 Qualified personnel .................................................................................................................................... 5
Conformity.................................................................................................................................................. 5
2Proper use ................................................................................................................................................ 6
Operation of the unit................................................................................................................................... 6
Intended use .............................................................................................................................................. 6
Provisions for operation with fireplaces...................................................................................................... 6
Guarantee conditions, warranty and liability............................................................................................... 6
Guarantee conditions................................................................................................................................. 6
Warranty .................................................................................................................................................... 6
Liability ....................................................................................................................................................... 7
3Safety ........................................................................................................................................................ 7
Symbols used ............................................................................................................................................ 7
Safety regulations ...................................................................................................................................... 7
3.1.2.1 Safety instructions – general...................................................................................................................... 7
3.1.2.2 Safety instructions – Installation................................................................................................................. 8
Installation conditions................................................................................................................................. 8
4Instructions for the user and qualified personnel................................................................................. 8
Product description .................................................................................................................................... 8
Control panels............................................................................................................................................ 9
Main components....................................................................................................................................... 9
Type label .................................................................................................................................................. 9
Frost protection .......................................................................................................................................... 9
Available control modules ........................................................................................................................ 10
LED control panel..................................................................................................................................... 10
4.2.1.1 LED control panel control functions.......................................................................................................... 10
4.2.1.2 Signals used to indicate operating and error conditions........................................................................... 11
TFT control panel..................................................................................................................................... 12
4.2.2.1 TFT control panel operations and signals ................................................................................................ 13
Menu structure of the TFT control panel .................................................................................................. 14
Main menu Information ............................................................................................................................ 15
4.3.1.1 Sub-menu Current message .................................................................................................................... 15
4.3.1.2 Sub-menu Last message ......................................................................................................................... 15
4.3.1.3 Sub-menu Fan speeds............................................................................................................................. 16
4.3.1.4 Sub-menu Current device status.............................................................................................................. 16
4.3.1.5 Sub-menu Software versions ................................................................................................................... 16
4.3.1.6 Sub-menu Connected units...................................................................................................................... 16
4.3.1.7 Sub-menu Filter running time................................................................................................................... 16
4.3.1.8 Sub-menu Operating hours...................................................................................................................... 16
Main menu Settings ................................................................................................................................. 16
4.3.2.1 Sub-menu Fan speeds............................................................................................................................. 16
4.3.2.2 Sub-menu Filter ....................................................................................................................................... 17
4.3.2.3 Sub-menu Frost protection....................................................................................................................... 17
4.3.2.4 Sub-menu Automatic................................................................................................................................ 17
4.3.2.4.1 Automatic timer ........................................................................................................................................ 17
4.3.2.4.2 Automatic sensor ..................................................................................................................................... 19
4.3.2.5 Sub-menu Date/time ................................................................................................................................ 19
4.3.2.6 Sub-menu Language selection ................................................................................................................ 19
4.3.2.7 Sub-menu Screen dimming...................................................................................................................... 19
4.3.2.8 Sub-menu Key lock .................................................................................................................................. 20
4.3.2.9 Sub-menu Summer ventilation without bypass ........................................................................................ 20
4.3.2.10 Sub-menu Supply heater ......................................................................................................................... 20
4.3.2.11 Sub-menu Ground heat exchanger shutter.............................................................................................. 20
4.3.2.12 Sub-menu Brine defroster cooling............................................................................................................ 21
Boost ventilation mode with external boost ventilation key ...................................................................... 21
Maintenance by the user.......................................................................................................................... 21
Replacing the unit filters........................................................................................................................... 21
Resetting the filter running time ............................................................................................................... 24

4
4.4.2.1 Reset filter running time with LED control panel ...................................................................................... 24
4.4.2.2 Reset filter running time with TFT control panel....................................................................................... 24
What should I do in case of a fault?......................................................................................................... 25
Disposal................................................................................................................................................... 25
5Chapter for qualified personnel............................................................................................................ 26
General system configuration .................................................................................................................. 26
Installation requirements.......................................................................................................................... 26
Transport and packaging ......................................................................................................................... 26
Checking the scope of delivery................................................................................................................ 27
Mounting.................................................................................................................................................. 27
Wall mounting.......................................................................................................................................... 27
Fitting on Floor stand (optional) ............................................................................................................... 29
Connecting the ventilation tubes.............................................................................................................. 30
Connecting the condensate drain hose ................................................................................................... 31
Electrical connections .............................................................................................................................. 33
Adapter board connection........................................................................................................................ 33
Connecting TFT control panel.................................................................................................................. 34
Connecting several TFT control panels ................................................................................................... 34
Connecting the LED control panel ........................................................................................................... 35
Connecting external boost ventilation keys.............................................................................................. 35
Connecting external sensors ................................................................................................................... 36
Connecting the status relay ..................................................................................................................... 36
Connecting external release .................................................................................................................... 36
Connecting digital inputs and outputs ...................................................................................................... 36
Operation without connected control panel.............................................................................................. 37
Commissioning the FOCUS unit.............................................................................................................. 37
Readiness for operation........................................................................................................................... 37
Adjusting the air volume flow ................................................................................................................... 37
5.5.2.1 Adjusting the nominal air volume flow with TFT control panel ................................................................. 37
5.5.2.2 Adjusting the nominal air volume flow with LED control panel................................................................. 38
Adjusting the valves................................................................................................................................. 38
Menu settings by qualified persons/service staff...................................................................................... 38
Main menu Setup..................................................................................................................................... 39
5.6.1.1 Sub-menu Frost protection ...................................................................................................................... 39
5.6.1.2 Sub-menu Fan speeds ............................................................................................................................ 39
5.6.1.3 Sub-menu Supply heater ......................................................................................................................... 40
5.6.1.4 Sub-menu Summer ventilation without bypass........................................................................................ 40
5.6.1.5 Sub-menu Ground heat exchanger shutter.............................................................................................. 41
5.6.1.6 Sub-menu Reset to factory data .............................................................................................................. 41
Maintenance and repair by the qualified personnel ................................................................................. 41
Inspection and cleaning of the heat exchanger........................................................................................ 42
Swapping the heat exchanger type.......................................................................................................... 45
Swapping the heat exchanger for the summer box.................................................................................. 45
Error display and troubleshooting ............................................................................................................ 45
Error display with LED control panel........................................................................................................ 45
Error displays with TFT control panel ...................................................................................................... 46
Technical description ............................................................................................................................... 47
Unit types................................................................................................................................................. 47
Air connection design versions ................................................................................................................ 47
Technical specification............................................................................................................................. 47
Dimensions.............................................................................................................................................. 49
FOCUS circuit plan .................................................................................................................................. 50
Master Controller terminal assignment .................................................................................................... 51
6Appendices ............................................................................................................................................ 52
Checklist A Maintenance work for users.................................................................................................. 52
Checklist B Maintenance work for qualified personnel............................................................................. 53
Commissioning and handover protocol.................................................................................................... 54
Air volume protocol .................................................................................................................................. 55

5
1 Introduction
General
This translation of the original instruction manual contains instructions and information on the safe operation, correct
installation, operation and maintenance of the Focus (F) 200 ventilation unit.
Subject to change and all rights reserved.
This documentation has been compiled with the utmost care. However, no rights can be derived from this regarding
the publisher’s liability for damages due to missing or incorrect information in this documentation. As a result, it is
possible that the unit may deviate slightly from this description. In the event of disputes, the German version of the
documentation shall be binding.
•Read the instructions in full before installing and commissioning the ventilation unit. This will help you avoid
hazards and errors.
•Be sure to observe all safety notes, warnings and information on precautionary measures.
•The instruction manual constitutes a part of the product. Keep the manual for future reference.
Questions
You can address all questions and request the most recent manuals and new filters from your Zehnder
representative. The contact information is found on the back cover of this manual.
Validity
This document applies to:
•FOCUS 200 series (Zehnder Focus 200 series)
•FOCUS F 200 series (Zehnder Focus 200 enthalpy series)
All the units in the FOCUS 200 series and FOCUS F 200 series are referred to below using the generic product name
FOCUS, except where it is necessary to distinguish between specific types.
This instruction manual deals with the various design variants of the FOCUS ventilation unit. Possible accessories
are only described to the extent necessary for appropriate operation of the unit. Please refer to the respective
instructions for further information on accessory parts.
Target groups
This instruction manual is for users and qualified personnel. The activities are only allowed to be carried out by
appropriately trained personnel who are sufficiently qualified for the respective work involved.
Qualification of target group
1.3.1.1 Users
Users must be instructed by qualified personnel as follows:
•Instruction in hazards when handling electrical devices.
•Instruction in the operation of the FOCUS unit.
•Instruction in the maintenance of the FOCUS unit.
•Knowledge of and compliance with this manual, including all safety instructions.
1.3.1.2 Qualified personnel
Qualified personnel must have the following qualifications:
•Training in dealing with hazards and risks when installing and operating electrical devices.
•Training for the installation and commissioning of electrical devices.
•Knowledge of and compliance with the locally applicable building, safety and installation regulations of the
relevant local authorities or municipalities, the regulations of the water and electric utilities and other official
regulations and guidelines.
•Knowledge of and compliance with this document, including all safety instructions.
Conformity
The Focus (F) 200 series ventilation units from the manufacturer
Zehnder Group Zwolle B.V.
Lingenstraat 2 ● 8028 ● PM Zwolle-NL ● Tel.: [phone]
Zwolle commercial register 05022293
comply with the directives and standards of the EU and EAC Declaration of Conformity.

6
2 Proper use
Operation of the unit
The unit may only be operated if it has been installed correctly and according to the
specifications and directives of the installation manual of the unit.
The unit may be operated by the following groups of people: children from age 8,
persons with limited physical, sensory or mental abilities, or persons with insufficient
experience and specialised knowledge, provided they are supervised or instructed in
the safe handling of the unit and understand the associated hazards.
Children must not play with the unit.
Children must not carry out cleaning and maintenance without supervision.
Intended use
The FOCUS unit can be used for controlled ventilation in homes and offices (and in
industrial buildings subject to certain restrictions). Any other use or any use beyond
this is considered improper use.
The ventilation unit is not suitable for smoke extraction or drying buildings, for
ventilation of rooms with aggressive and corrosive gases or for rooms with extreme
dust levels.
The unit must not be used for extracting combustible or explosive gases.
Intended use also includes observing all instructions in the instruction manual.
In the event of improper use, the Zehnder Group accepts no liability for any damage that may occur and no warranty
for the proper and functional operation of the ventilation unit.
Provisions for operation with fireplaces
Local requirements must be taken into account through appropriate standards, laws and guidelines. The FOCUS unit
may only be installed in rooms, apartments or utilisation units of comparable size in which open flue fireplaces are
installed if:
•safety features prevent simultaneous operation of open flue fireplaces and the air extracting system or
•the flue gas discharge of the open flue fireplace is monitored by special safety features. In case of open flue
fireplaces for liquid or gaseous fuels, the fireplace or the ventilation system must be switched off if the safety
feature is triggered. In case of open flue fireplaces for solid fuels, the ventilation system must be switched off if the
safety feature is triggered.
•The FOCUS is prepared for the simultaneous operation with fireplaces.
The ventilation units for controlled ventilation of an apartment or comparable utilisation unit must not be installed if
open flue fireplaces are connected to multiple-occupancy flue systems in the utilisation unit.
For proper operation, it must be possible to shut off any combustion ventilation lines and flue gas systems of open
flue fireplaces. In case of flue gas systems of fireplaces for solid fuels, it must only be possible to operate the cut-off
device manually. The position of the cut-off device must be recognisable from the setting of the operating handle.
This is considered to be fulfilled if a cut-off device against soot (soot blocker) is used. Fire protection requirements
with regard to the fire protection installation regulations for the construction of the ventilation system, and federal
state regulations, in particular the building authority guideline on the fire protection requirements for ventilation
systems in the currently valid version, must be observed.
Guarantee conditions, warranty and liability
Guarantee conditions
The manufacturer gives a warranty of 24 months starting from the installation date, or a maximum 30 months starting
from the date of manufacture, for the unit. Warranty claims may only be asserted for material defects and/or design
faults that have occurred during the warranty period.
In the event of a warranty claim, the unit must not be disassembled without the written consent of the manufacturer.
Spare parts are only covered by the warranty if they have been supplied by the manufacturer and fitted by an
approved technician.
Warranty
In the event of a warranty claim, the unit must not be disassembled without the written consent of the manufacturer.
Spare parts are only covered by the warranty if they have been supplied by the manufacturer and fitted by an
approved technician.

7
The warranty shall be null and void if:
•The warranty period has elapsed.
•The installation has not been carried out in accordance with the applicable regulations.
•The unit is operated without a filter.
•Original parts have been replaced by non-original parts.
•Unauthorised changes or modifications to the unit have been made.
•The defects are due to improper installation, improper use or neglected maintenance of the system.
Liability
The FOCUS unit is intended for use in the mechanical ventilation of apartments, offices and rooms with a similar
purpose. Every other use other than that described in chapter 2 is considered “improper use” and may result in
personal injury or damage to the balanced ventilation unit for which the manufacturer cannot be held liable.
The liability of the manufacturer becomes null and void in the following cases:
•Failure to observe the instructions specified in this manual pertaining to safety, operation and maintenance.
•Modifications to the ventilation unit or the use of components that have not been approved or recommended by
the manufacturer.
•Incorrect installation, improper use or contamination of the system.
•Original parts have been replaced by non-original parts.
•The unit is operated without a filter.
3 Safety
Carefully read all safety instructions prior to commissioning the unit to make sure that you use the unit in a safe and
intended way.
Symbols used
You will find the following symbols in this document:
Symbol Meaning
Important note!
Caution: Risk of affecting the operation of the ventilation system or damaging the unit!
Caution: Risk of personal injury!
Safety regulations
3.1.2.1 Safety instructions – general
Always observe the safety regulations, warning, comments and instructions stated in
this manual. Non-observance results in hazard of injury and hazard of material
damage to the FOCUS unit.
The installation, commissioning and maintenance (except for filter replacement) must
be carried out by an approved technician unless stated otherwise in the instructions.
Implementation of this work by a non-approved technician can result in personal
damage or reduced performance capacity of the ventilation system.
Do not disconnect the unit from the power supply unless instructions to the contrary
are listed in the manual. This can result in the formation of moisture and mould.
Do not make any changes to the unit or to the specifications listed in this document.
Such changes can cause personal injury or lead to reduced performance of the
ventilation system.
To prevent accidents, a damaged mains cable must be replaced by an original cable
by the manufacturer, a person commissioned to carry out maintenance by the
manufacturer or a similarly qualified person.
After installation, have your system engineer/installer instruct you on the unit and the
control panel. The ventilation unit may only be used in accordance with chapter 2
"Intended Use".
Only operate the unit with a closed housing.

8
3.1.2.2 Safety instructions – Installation
Comply with the general locally applicable building, fire, safety and installation
regulations of the relevant local authorities, the regulations of the water and electric
utilities and all other official regulations.
Pull the unit’s plug from the mains socket to separate the unit from the power supply.
If the unit does not have a plug, use a switch according to EN 60335-1 (with
separation of all three poles and 3 mm clearance, over-voltage category III).
Always disconnect the unit from the power supply prior to commencing maintenance
or repair activities. If the FOCUS unit is operated while open, there is hazard of injury.
Make sure that the FOCUS unit cannot switch on unintentionally.
To eliminate the risk of coming into contact with the running fans, the air ducts must
be fastened to the unit before the power supply is connected, observing a minimum
length of 900 mm.
Therefore, always apply measures to prevent electrostatic discharges when working
on the electronics. Wear an antistatic wrist band, for example. Static energy can
cause damage to electronic components.
The entire installation must comply with the applicable (safety) regulations from the
following sources:
- local EU standard for safety features for low voltage systems;
- Mounting/installation manual of the manufacturer (see the back cover of the
instruction manual for the contact data of Zehnder).
A socket with grounding at a distance of 1 meter or no more than the length of the
included mains cable must be present.
Always use the included mains cable.
For safety reasons do not use an extension cable.
Installation conditions
The following conditions must be considered when deciding whether a unit should be installed in a specific area to
ensure the correct installation of the unit.
•Ensure that the temperatures in the installation area are in the permissible range year-round. The information
regarding the permissible temperature can be found in the “Technical specification” table.
•When choosing an installation location, it is recommended that you avoid areas with a high average level of
humidity (ambient conditions for indoor climate control system must not continuously exceed 70% RH at 22 °C).
•The unit must not be installed in rooms subject to explosion hazards.
•Inside wet rooms, the unit may only be installed outside of protection zones 1 and 2 in accordance with DIN
57100/VDE 100 Part 701.
•Connect the unit to a power source with 230 V/50 Hz.
•Check whether the electrical installation is suitable for the maximum output of the unit. The values for the
electrical input power can be found in the “Technical specification” chapter.
•Check that the installation area of the unit meets the requirements in the “Installation requirements” chapter.
4 Instructions for the user and qualified personnel
Product description
The FOCUS unit is a ventilation unit with heat recovery for healthy, well-balanced and energy-saving comfort
ventilation. A comfort ventilation system extracts foul-smelling waste air from areas such as kitchens, bathrooms and
toilets and conveys an identical quantity of fresh air into living rooms, bedrooms and children's rooms.
For heat recovery, the unit types in the FOCUS 200 series feature highly efficient cross-counterflow heat exchangers
made from plastic. The unit types in the FOCUS F 200 series rely on membrane moisture heat exchangers (enthalpy
exchangers), which are capable of transferring moisture as well as heat because of their physical properties. An
optional summer box module can be used instead of the heat exchanger for thermal separation of the two airflows.
The housing is made from sheet metal with an anthracite powder coating. The high-quality polypropylene inner lining
ensures the necessary thermal insulation and unit soundproofing.
The FOCUS unit has two maintenance-free 230 VAC centrifugal fans with an integrated power supply unit and
electronic commutation. The fans run at a steady volume flow to keep the air volume constant at any selected fan
speed. The air volume is not affected even if the filters become soiled.
The unit contains filters according to EN ISO 16890 of the filter class ISO Coarse for the outdoor air and the extract
air. These consist of a synthetic non-woven filter medium with a polypropylene frame. As an option, filters of filter
class ISO ePM1 can be used for the outdoor air. The filters are accessed via the front panel.

9
Control panels
With the TFT control panel or LED control panel you can configure and operate the system from a central point. Both
control panels are only suitable for use in indoor areas.
Main components
Fig. 1: Main components of the FOCUS unit
Item Description
A
Fastening sheet
B
Control cover plate
C
Interface sheet with JEC unit plug and RJ-45 fitted coupling
D
Control boards
E
Filter (2x)
F
Summer box – Module that keeps the airflows thermally separate
G
Housing made from coated sheet steel
H
EPP moulded parts
I
Condensate drain screw connection
J
Fans (2x)
K
EPP foam cover for fan (2x)
L
Heat exchanger with strap and condensate tray
M
EPP foam cover with strap for filter and heat exchanger
N
Front panel made from coated sheet steel
Table 1: FOCUS main components
Type label
The type label identifies the product unequivocally. You will need the details on the type label for the safe use of the
product and in case of questions for service. The type label is located on the same side of the unit as the air
connections and must remain permanently attached to the product.
Frost protection
The FOCUS unit is equipped with automatic frost protection, which prevents the heat exchanger from freezing should
the outdoor air temperature drop to a very low level. Depending on the set frost protection mode, if the outdoor air
temperature drops below a certain limit, the fans are temporarily shut off.
The automatic frost protection for screening the supply air temperature protects an optional downstream hydraulic
heat register from freezing and temporarily switches off the fans if the supply air of the fans drops below a certain
limit.
G
D
B
A
J
E
K
L
N
I
C
H
F
M

10
Available control modules
The FOCUS unit can be operated with the following control modules:
•Control unit LED control panel with the PEHA switch programme design (W x H x D in mm: 80 x 80 x 12)
•Control unit TFT control panel (W x H x D in mm: 102 x 78 x 14)
•External boost ventilation key(s) (as many as required, potential-free)
•External sensors with sensor signal 0–10 V or 4–20 mA
LED control panel
The LED control panel is equipped with 7 symbolised short-stroke keys. Pushing a key or a key combination triggers
the associated control functions. The active operating mode is indicated in each operating field via a green or red
LED. The LED control panel with the PEHA switch programme design can be installed on the surface or in the wall. In
case of surface-mounted installation a PEHA surface-mounted plug socket is needed.
4.2.1.1 LED control panel control functions
Symbol Description Explanation
Key
Supply and extract air
mode
Pushing this key sets the supply and extract air mode.
Key
Extract air mode
Pushing this key sets the extract air mode only. The supply air mode
is switched off.
This key must be permanently deactivated
when operating the ventilation unit with a
fireplace! Simultaneous operation of a ventilation
system and fireplace imposes more stringent safety
requirements with regard to low pressure screening
and a switch-
off function is required for the
ventilation unit.
Key
Supply air mode
Pushing this key sets the supply air mode only. The extract air mode
is switched off.
Key
Decreasing the fan speed
Pushing this key decreases the fan speed in increments.
Key
Increase fan speed
Pushing this key increases the fan speed in increments.
Key
Boost ventilation mode
Pushing this key activates the boost ventilation during the supply
and extract air mode on fan speed 7 for 15 minutes. At the end of
the boost ventilation time the previously active operating mode
resumes. You can cancel the boost ventilation mode at any time by
pressing another function key.
Key
Reset filter running time
To ensure cyclic filter inspection, the control has an integrated
operating hours counter. The reset filter running time key allows you
to reset the filter running time.
…
Key combination
activate/deactivate
standby mode
The standby function sets the ventilation unit to an energy saving
mode. Repeated pushing of the –key until LED L1 is also turned off
activates the standby mode. This status is indicated by the periodic
flashing of LED L8. Pushing the +key ends the standby mode and
sets fan speed 1. LED L1 is lit up.
Filter replacement/reset filter
running time
Boost ventilation mode
Decrease/increase fan speed
from 1 to 7
Supply and extract air mode
Extract air mode
Supply air mode
Fig. 2: Operation and information fields LED control panel

11
LED L8
LED L11
LED L10
LED L12
LED L9
LED L1 … L7
…
Key combination
configuration mode for
operation together with a
fireplace
Pushing the key combination for at least 3 seconds deactivates the
extract air mode permanently. This status is signalled by LEDs
L8+L11+L12, where L8 and L12 are lit up, L11 blinks 2 times and
then remains switched off. This signal is only visible when holding
the key combination. Activating the extract air mode key in the
deactivated state results in a short 3 time blinking of LED L11 to
signal the deactivated state. Pushing the key combination again for
at least 3 s cancels the key lock. This change is again signalled by
the LEDs L8+L11+L12, where L8 and L12 are lit up, L11 blinks 2
times and then remains switched on. This signal is only visible when
holding the key combination. This enables the extract air mode
again.
Always press the reset filter replacement key first!
…
…
Key combination for the
summer ventilation
temperature limit
configuration mode
Setting keys
The summer ventilation can only be implemented with
an LED control panel if it has been released in the
factory setting.
Pushing the key combination for at least 3 seconds activates the
setting for the temperature limit. This status is signalled by the
blinking of LEDs L8 and L10. With the setting keys the upper
temperature limit for summer ventilation depending on the extract air
temperature can be set between 21 °C (LED L1 lights up) and 27 °C
(LED L7 lights up). After pressing the key combination again for at
least 3 s the setting is saved and the summer ventilation
temperature limit is terminated.
Always press the reset filter replacement key first!
…
…
Key combination
imbalance configuration
mode
Keys
for setting the balance
By pushing the key combination for at least 3s, the imbalance
configuration mode is activated and the LEDs L10 and L12 blink.
The keys for setting the balance can now be used to set the balance
of the fan speeds active upon activation of the imbalance
configuration mode in 5% increments. The balance is not set for
each fan speed individually, but jointly for a group of fan speeds.
The adjustable range is between -15% (L1) and +15% (L7). In the
central position (L4) the supply air and extract air run with the same
rotational speed. After pressing the key combination again, the
setting is saved and the imbalance configuration mode concluded.
Always press the reset filter replacement key first!
1st group
fan speeds <1+2>
2nd group
fan speeds < 3 +4+5>
3rd group
fan speeds <6+7>
Table 2: Control functions of the LED control panels
4.2.1.2 Signals used to indicate operating and error conditions
Fig.
3: LED signals LED control panel

12
LED signal Function / Meaning
LED light strip display
L1 ... L7
No LED ≙fan speed 0 (fan off, standby)
1 LED (L1) ≙fan speed 1
2 LEDs (L1 + L2) ≙fan speed 2
... etc.
7 LEDs (L1+ L2+…+ L7) ≙fan speed 7
L1 + L7 light up
No external release: fan is off
L8 lights up
Supply and extract air mode
L8 blinks Error (sensor or frost protection (outdoor air temperature too low)):
Fans are switched off
L8 flashes
Standby mode active
L8 + L10 blink Summer ventilation temperature limit configuration mode
(Displayed only during the configuration phase)
L8 + L11 + L12 blink
General error, the error number is displayed binary with the LEDs L1 to L7 (see
Table 38 in chapter 5.8.1 error signals with LED control panel)
L8 + L12 light up + L11 blinks 2x
and then stays out
Configuration mode for operation together with a fireplace
(Displayed only during the configuration phase)
L9 lights up
Boost ventilation mode (L1 + L2 + L3 + L4 + L5 + L6 + L7 light up)
L10 lights up
Filter running time expired
L10 flashes
The remaining filter running time is ≤ 10 days
L10 + L12 blink
Configuration mode balance compensation for the selected fan speed
(Displayed only during the configuration phase)
L11 lights up
Extract air mode
L11 blinks
Error fan 1 HALL: Fans are switched off
L11 blinks briefly 3 times Extract air mode deactivated (extract air mode key locked, configuration for
operation in conjunction with fireplace active)
L12 lights up
Supply air mode
L12 blinks
Error fan 2 HALL: Fans are switched off
Table 3: Functions assigned to LED signals
TFT control panel
The 3.5“ TFT display of the control panel is operated by touching the button symbols with the fingers. The active
operating mode and the associated button are indicated by colour signals. The control panel can be fitted into a
standard flush socket.
The ventilation unit can be operated with up to three TFT control panels or without a control panel. In
this case, the system operates in the last set operational mode.
Button for un-occupied mode
Time display
Filter symbol/filter running time
display
Button for boost ventilation mode
Button for standby mode
Button for key lock
Button for menu mode
Button fan speed 1 – 2 – 3
Button for help
Short help text display
Button for automatic mode
Messages/error display
Active operating mode display
Fig.
4: Operation and information fields of the touch pad

13
4.2.2.1 TFT control panel operations and signals
Symbol Description Explanation
-
Fan speed 0 (FS0)
The fans come to a stop. This fan speed is used for the functions
automatic timer mode and un-occupied mode
Button
Fan speed 1 (FS1)
By touching this button, the smallest permanent fan speed 1 (reduced
ventilation) is set.
Button
Fan speed 2 (FS2)
By touching this button, the medium permanent fan speed 2 (nominal
ventilation) is set. This fan speed is set by the service technician
during the commissioning of the unit. A balance between supply air
and extract air is adjusted.
Button
Fan speed 3 (FS3)
By touching this button, the highest permanent fan speed 3 (intensive
ventilation) is set.
Button
Boost ventilation mode
Touching this button sets the boost ventilation mode. It initiates an
automatic timer programme in which the fan speed 3 is active for a
duration of 15 minutes (factory setting).
Button
Un-occupied mode
Pushing this button sets the un-occupied mode. For the duration of an
absence, activating the un-occupied mode sets a reduced ventilation
intensity for moisture protection. A different button must be activated
to end this function.
Button
Automatic mode
Automatic timer mode
Automatic sensor mode
The automatic mode has 2 automatic functions – automatic timer and
automatic sensor, in which the manual settings are deactivated upon
touch.
With the automatic timer mode, different fan speeds (FS0, FS1, FS2
or FS3) can be stored for every day of the week with a duration of 15
minutes. This “fan speed weekly profile” can be configured and
individually adjusted in the menu settings/sub-menu automatic timer.
The automatic sensor mode controls the fan according to a pre-set
linear characteristic curve depending on an analogue room air quality
sensor (also a combination of CO2, air humidity and temperature).
Button
Menu mode
By touching this button, you enter the Information, Settings and Set-
up menu.
Button
Standby mode
The standby function sets the ventilation unit to an energy saving
mode. In the standby mode the total power consumption of the unit
drops to less than 1 W. The screen display becomes dark, but the
touch pad remains active for “waking” the system. Touching the touch
pad is enough to end the standby mode.
Button
Help
By touching this button, you enter a context-sensitive help menu. If
this key is grey, then there is no help text available.
Button
Activate key lock
By touching this button, the touch pad is deactivated except for this
button. The screen is dimmed and inactive (cleaning status).
Button
Deactivate key lock
By touching and holding this button (approx. 2-3 s) you return to the
start menu.
Button
Check mark
By touching this button, the desired or available parameter is selected
or confirmed.
Button
Enter
By touching this button, you can navigate in the various sub-menus.
Changed parameters are saved to the storage.
Button
Cancel/return
By touching this button, you move from a menu to the next higher
menu level without saving and changed data.
Signal
Messages
A blinking yellow warning triangle on the top of the right side indicates
an information or an error. Information is registered in the
Information/Current message menu and errors in the
Information/latest messages menu.

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Signal
Filter symbol/filter
running time
To ensure cyclic filter inspection, the control has an integrated
operating hours counter. The operating time is subtracted in a count-
down manner from the pre-set filter running time and indicated in days
under the filter symbol.
The filter symbol colour changes from white to yellow, when the filter
running time ≤ 10 d and from yellow to red if the filter running time has
expired.
When the filter runtime is expired the message “replace filter” is
created.
Buttons
+ / -
By touching the button, you can change the menu values (e.g. fan
speeds in 1% increments or the time in minute or hour increments).
The data is only saved when the enter button is touched!
Buttons
Navigation
By touching the navigation buttons left/right and up/down you can
navigate in the menus to select the desired parameter in the
respective menu level. If several values can be adjusted in a menu
(e.g. for date and time: day, month, year, hours, minutes) you can
select the individual values to be adjusted and then change them via
+/-.
Table 4: TFT control panel operations and signals
Menu structure of the TFT control panel
The menu structure consists of the start menu and the three main menus (Information, Settings and Setup). The start
menu is shown upon activation of the TFT touch pad. The main menus are each divided into sub-menus that allow
access to information or parameter changes.

15
Fig. 5: Menu structure of the TFT control panel
Main menu Information
The main menu Information is divided into eight sub-menus. In the sub-menus information regarding the current unit
status as well as selected factory settings (e.g. unit type) are displayed. The respective sub-menus are selected with
the navigation buttons and opened via Enter.
4.3.1.1 Sub-menu Current message
In this sub-menu, information (e.g. replace filter) or errors (e.g. sensor disruption) are shown as current messages. In
addition to this message, a yellow warning triangle blinks on the top right edge of the screen. In general, only error
messages result in the shutting off of the fans.
4.3.1.2 Sub-menu Last message
This is where the last three occurred errors are registered with their date and time according to the event. In addition
to this message, a yellow warning triangle blinks on the top right edge of the screen.

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4.3.1.3 Sub-menu Fan speeds
In this sub-menu the percentage settings of the three fan speeds 1, 2 and 3 (FS1, FS2, and FS3) as well as the pre-
set active times for the un-occupied mode and boost ventilation mode are shown.
4.3.1.4 Sub-menu Current device status
In this sub-menu, the current unit-side supply air temperature and outdoor air temperature as well as the bypass
status (closed/open) for units with bypass shutter or the summer ventilation status (active/inactive) for units without
bypass shutter, are shown.
4.3.1.5 Sub-menu Software versions
In this sub-menu, the unit type along with the hardware and software status of the controllers included in the control
system are shown.
4.3.1.6 Sub-menu Connected units
In this sub-menu check marks indicate which units are actually connected to the internal unit BUS and recognised by
it.
4.3.1.7 Sub-menu Filter running time
In this sub-menu the pre-set filter running time and the current remaining filter running time are shown. The remaining
filter-running time is counted down every calendar day of operation of the ventilation unit. In addition, when the pre-
set filter running time is exceeded by more than 0 days, the message “Filter running time exceeded by xxx day”, is
shown.
4.3.1.8 Sub-menu Operating hours
The sub-menu shows:
•Total operating hours (time during which the unit is connected to the mains voltage)
•Fan operating hours (time in which the fans are operating)
Main menu Settings
In the main menu Settings users can make changes that primarily serve the individual adjustments that primarily
serve adjustment to their individual comfort. The respective sub-menus are selected with the navigation buttons and
opened via Enter. Only sub-menus with text shaded in red can be parametrised.
The settings in the sub-menus are only saved when the enter button is touched!
4.3.2.1 Sub-menu Fan speeds
The following can be selected and adjusted with the navigation buttons:
•Fan speed 1 and fan speed 3 (in 1% increments)
•Duration of the boost ventilation (in 5 -minute increments)
•Fan intensity for un-occupied times (FS1 in min/h increments)
Symbol Description Explanation/Actions
Button
Fan speed 1 (FS1)
Activate FS1 with the button fan speed 1 and parametrise it with the
navigation buttons.
Setting range: 17% < FS1 < FS2
Button
Fan speed 3 (FS3)
Activate FS3 with the navigation button fan speed 3 and parametrise
it with the navigation buttons.
Setting range: FS2 < FS3 < 100%
Permanent boost ventilation
Settings: 15 min …120 min,
the air volume flow of the boost ventilation is equal to fan speed 3.
Fan intensity for the duration
of the un-occupied time for
moisture protection
Settings: 15 min/h, 30 min/h, 45 min/h,
the ventilation intensity of the active time of the interval is equivalent
to fan speed 1.
Table 5: Parametrisation sub-menu fan speeds

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4.3.2.2 Sub-menu Filter
The following can be adjusted/read here:
•Filter running time in 10-day increments
•Current remaining filter running time
•Reset of the filter running time and the counter due to exceeding the filter running time
Symbol Description Explanation/Actions
Duration of the filter running
time
Settings: 30 d … 180 d, with the navigation button
a maximum filter running time of 90 days is recommended.
Remaining filter running time
Display of the currently remaining filter running time
Display area
Resetting the filter running
time
With the check mark and Enter buttons, the filter running time can
be reset to the pre-set value.
Table 6: Parametrisation sub-menu filter
4.3.2.3 Sub-menu Frost protection
In this sub-menu the frost protection mode can be set with the navigation buttons:
•ECO
•Safe
•Moisture HE (enthalpy exchanger) with its own frost protection limit
Symbol Description Explanation/Actions
Display area
Frost protection mode ECO
In the “ECO” mode, the standard heat exchanger can freeze under
extreme conditions. The energy cost for frost protection is lower.
Display area
Frost protection mode Safe
In the “Safe” mode, freezing of the standard heat exchanger is
generally prevented. The energy cost for frost protection is higher.
Display area
Frost protection mode
moisture heat exchanger
In the moisture HE mode, freezing of the enthalpy exchanger
(membrane moisture heat exchanger) is generally prevented.
Table 7: Parametrisation sub-menu Frost Protection
4.3.2.4 Sub-menu Automatic
Two operating modes are available in the automatic mode:
•Automatic timer
•Automatic sensor
The desired operating mode of the automatic mode is selected with the navigation buttons (red text background) and
setting a check mark and confirmed via Enter.
4.3.2.4.1 Automatic timer
Symbol Description Explanation/Actions
Button
Calendar
By touching, a weekday (Mon-Sun) or a group of weekdays (Mon-Fri, Sat-
Sun) can be selected to allocate fan speeds to specific times.
Button
FS0
The fans come to a stop.
Button
FS1
Reduced ventilation
Button
FS2
Nominal ventilation
Button
FS3
Intensive ventilation

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Cursor
The cursor marks the time in the ¼-hourly range. With the navigation
buttons the cursor is navigated over the time frame in which the selected
fan speed should be active.
Table 8: Automatic timer parametrisation
By selecting a group of days (e.g. Mon-Fri), the changed data are applied to each day of the group. The settings for
the group “Mon-Fri” are then identical for the days “Mon”, “Tue”, ... Fr (or for the group “Sat-Sun” identical for the days
“Sat”, “Sun”). To operate the system with different fan speeds and time profiles on different days, the profile of the
respective day (“Mon” ... “Sun”) must be changed. Any subsequent changes in the groups “Mon-Fri” or “Sat-Sun” will
overwrite the previous settings of the individual days!
Fig. 6: Automatic timer factory setting, groups weekdays Mon-Fri
Fan speed Time frame (Time 000 - 2400)
FS1
8
30
- 16
00
FS2
0
00
- 8
00
16
00
- 24
00
FS3
8
00
– 8
30
Table 9: Time frame factory setting, groups weekdays Mon-Fri
Fig. 7: Automatic timer factory setting, groups weekdays Mon-Fri
Fan speed Time frame (Time 000 - 2400)
FS2
000 - 2400
Table 10: Time frame factory setting, groups weekdays Sat-Sun
The automatic timer factory setting can only be restored via the main menu Setup.
If the operating mode “Automatic timer” is active in the automatic mode, then the active fan speed (only FS 1-3) is
displayed in grey according to the time frame in addition to the automatic mode icon.
Display weekday/group
Cursor
Selection weekday/group
Symbol FS0
Display fan speed (cursor status)
Display time (cursor status)
Symbol FS2 (Cursor status)
Symbol FS1
Symbol FS3

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Fig. 8: Automatic mode automatic timer with active fan speed FS2
4.3.2.4.2 Automatic sensor
The operating mode Automatic sensor of the automatic mode requires the connection of an outdoor air quality / CO2
or moisture sensor to the control of the ventilation unit. The analogue signal of the sensor is interpreted as a control
signal for the rotational fan speed of the ventilation unit. When applying several sensors in a ventilation system, the
output signal of a maximum value module will be used to control the ventilation unit.
First, the navigation buttons (red text background) and check marks are used to select whether the sensor is
equipped with a power or voltage output (Electrical power: 4...20 mA, voltage: 0...10 V) and confirmed via Enter.
Then the lowest point (characteristic curve start value p1) and the highest point (characteristic curve end value p2) of
a characteristic curve assumed to be linear between these two points for the fan speed are parametrised between
17% and 100%. The nominal values (red text background) to be parametrised can be selected with the navigation
buttons and the values adjusted with the +/- buttons.
Symbol Description Sensor output signal
0…10 V characteristic curve 4…20 mA characteristic curve
Characteristic
curve start
value
Umin (V)
≙
n_min (%) lmin (mA)
≙
n_min (%)
Characteristic
curve end
value
Umax (V) ≙n_max (%) Imax (mA) ≙n_max (%)
U-n characteristic curve diagram
l-n characteristic curve diagram
Table 11: Automatic sensor parametrisation
Plausibility check for sensors with power output:
•Concerns: Input A1 on the master controller (configured as 4...20 mA input)
•Error message if at the input a value of 0...3 mA is present for more than 1 s
•Reset of the error if I > 3.5 mA for at least 1 s
4.3.2.5 Sub-menu Date/time
In this menu the date and time are set. The nominal values (red text background) to be parametrised can be selected
with the navigation buttons and the values adjusted with the +/- buttons.
4.3.2.6 Sub-menu Language selection
In this menu, the local language for the TFT control panel can be selected via the navigation buttons.
4.3.2.7 Sub-menu Screen dimming
In this menu, individual screen brightness and the duration until the dimming takes effect after non-operation can be
adjusted using the navigation buttons.
•Duration until dimming in 1 min increments
•Dimming in 5% increments

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Symbol Description Explanation/Actions
Duration until
dimming
Settings: 1 min...10 min
until the dimming is activated after the TFT control panel was last
used
Degree of dimming
Settings: 5%...95%
in relation to the basic brightness of the active screen
Button
Light bulb
With this button the set dimming can be tested. The screen is
dimmed for 5 seconds according to the setting.
Table 12: Automatic sensor parametrisation
4.3.2.8 Sub-menu Key lock
The user interface of the TFT control panel can be deactivated by a password-protected key lock.
Symbol Description Explanation/Actions
Password query
Enter the password <11111> and confirm with Enter. The current
status “key lock” will be displayed on the touch pad.
Button
Deactivate key lock
After touching the button, the password is requested to deactivate
the key lock.
Enter the password <11111> and confirm with Enter.
Table 13: Activating /deactivating the key lock
4.3.2.9 Sub-menu Summer ventilation without bypass
The summer ventilation without bypass serves free cooling in ventilation systems without bypass shutter. When it is
activated, the exhaust air fan is switched off and thus heat transfer from the extract air to the supply air prevented. To
check the plausibility of the temperature conditions, the exhaust air fan is switched on additionally for 2 minute per
hour to the currently active fan speed.
This menu indicates whether summer ventilation without bypass is possible. The operating mode summer ventilation
without bypass can be released or not. The release of the summer ventilation function is selected with the navigation
buttons (red text background) and setting a check mark and confirmed via Enter. In addition, the temperature limit for
the summer ventilation function can be selected with the navigation buttons (red text background) and adjusted with
the +/- buttons. If the boost ventilation mode is activated during the active phase, the summer ventilation is
interrupted for the duration of the boost ventilation.
Abbreviation Description Explanation/Actions
t_som Temperature limit
summer ventilation
Temperature limit setting range: 20 °C…30 °C
The summer ventilation is active when the extract air exceeds the set
temperature limit and the outdoor air at the location of the unit is lower
than the extract air at the location of the unit.
In addition, the outdoor air at the location of the unit must be higher
than the set limit for the outdoor air.
Table 14: Temperature limit summer ventilation without bypass parametrisation
To prevents draughts due to supply air temperature that is too cold, summer ventilation remains
inactive below an outdoor air limit temperature. The limit value of the minimum outdoor air
temperature can be adjusted in the main menu Setup between 12 °C ... 20 °C (factory setting: 13 °C).
4.3.2.10 Sub-menu Supply heater
In this menu, a potentially existing supply heat module (electric heating register or hot water heating register) is
displayed. The supply heater function can be activated or deactivated. The release of the supply heater function is
selected with the navigation buttons (red text background) and setting a check mark and confirmed via Enter.
4.3.2.11 Sub-menu Ground heat exchanger shutter
In this menu, a potentially used GHE shutter (ground heat exchanger shutter) is shown. The GHE shutter function
can be activated or deactivated. The release of the GHE shutter is selected with the navigation buttons (red text
background) and setting a check mark and confirmed via Enter. In addition, the temperature limits for switching the
GHE shutter can be selected with the navigation buttons (red background) and adjusted with the +/- buttons.