Zehnder Rittling ComfoSpot 50 User manual

Decorative Radiators Comfortable indoor ventilation Heating and cooling ceiling systems Clean air solutions
User manual on operation and installation for operators and installers
Zehnder
ComfoSpot 50

Legal regulations
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This manual has been compiled with the utmost care. Nevertheless, the publisher accepts no liability for damage caused
by missing or incorrect details in this manual. We reserve the right at any time and without previous notification to change
the content of these instructions in part or as a whole.
The information contained in these documents is the property of Zehnder Group. Publication, as a whole or in parts,
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.
Zehnder manufacturer's warranty
The current warranty terms can be obtained in paper form using the normal distribution channels.
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All trademarks are recognized, even if they are not separately labelled. A missing label does not mean that an article or
sign is free of trademark rights.
© 2021 Zehnder Group
Product video on installation and function

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Contents
1  Foreword and introduction .................................................................................................................. 2 
 Notes on the user manual....................................................................................................................... 2 
 Validity .................................................................................................................................................... 2 
 Target groups ......................................................................................................................................... 2 
 Qualification of target group.................................................................................................................... 2 
 Conformity .............................................................................................................................................. 2 
2  Introduction and safety ........................................................................................................................ 3 
 Hazard classification............................................................................................................................... 3 
 Safety regulations ................................................................................................................................... 3 
 Installation conditions ............................................................................................................................. 3 
 Notes on the operational safety of the ventilation unit ............................................................................ 3 
 Operation with fireplaces ........................................................................................................................ 3 
 Commissioning and operation ................................................................................................................ 3 
 Notes on operation of the ventilation unit................................................................................................ 4 
 Standard operation of the unit ................................................................................................................ 4 
 Operating variants .................................................................................................................................. 4 
 Proper use .............................................................................................................................................. 4 
 Guarantee conditions, warranty and liability ........................................................................................... 4 
 Guarantee conditions.............................................................................................................................. 4 
 Warranty ................................................................................................................................................. 4 
 Liability.................................................................................................................................................... 4 
 Storage ................................................................................................................................................... 5 
 Environmentally friendly disposal............................................................................................................ 5 
3  Chapter for operators and qualified personnel.................................................................................. 5 
 Product description ................................................................................................................................. 5 
 Unit design and function ......................................................................................................................... 5 
 Overview of assemblies.......................................................................................................................... 6 
 Type label ............................................................................................................................................... 6 
 Frost protection....................................................................................................................................... 6 
 Operating and display elements of the control panel .............................................................................. 6 
 Description of the operating functions and signals ................................................................................. 7 
 Options for ventilation operation ............................................................................................................. 9 
 External control panel ............................................................................................................................. 9 
 Operation via networking ........................................................................................................................ 9 
 Automatic operation via sensor module................................................................................................ 10 
 Maintenance by the user ...................................................................................................................... 11 
 Filter maintenance ................................................................................................................................ 11 
 Unit maintenance.................................................................................................................................. 13 
 What should I do in case of a malfunction? .......................................................................................... 13 
4  Chapter for qualified personnel......................................................................................................... 13 
 Installation requirements....................................................................................................................... 13 
 Packaging and handling ....................................................................................................................... 13 
 Checking the scope of delivery ............................................................................................................. 13 
 Installation ............................................................................................................................................ 14 
 General installation requirements ......................................................................................................... 14 
 Installation preparations........................................................................................................................ 14 
 Installing the ventilation unit.................................................................................................................. 15 
 Relocating the internal control panel..................................................................................................... 16 
 Electrical connections ........................................................................................................................... 18 
 Parameterisation of boost ventilation and absent operating modes...................................................... 19 
 Configuration of the boost ventilation mode.......................................................................................... 19 
 Configuration of the Away mode........................................................................................................... 19 
 Installing the exterior wall panel as a facade finish............................................................................... 19 
 Commissioning ..................................................................................................................................... 20 
 Specialist maintenance......................................................................................................................... 21 
 Visualization of fault notifications .......................................................................................................... 22 
 Technical specifications........................................................................................................................ 23 
 Dimensions........................................................................................................................................... 24 
 Terminal scheme .................................................................................................................................. 25 


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1 Foreword and introduction
Notes on the user manual
This translation of the original user manual contains basic instructions that must be followed during the installation and
operation of the ComfoSpot 50 ventilation unit.
Read the instructions in full before installing and commissioning the ventilation unit. This will help you avoid hazards
and errors.
Provide the manual to the operator after the final assembly.
The user manual forms a part of the product. Keep the manual for future reference.
WARNING
Be sure to observe all safety notes, warnings and information on precautionary measures.
Read chapter “2 Introduction and safety” carefully.
Validity
This document applies to:
Unit type ComfoSpot 50 series
The unit type series are hereinafter designated with the common product name, ComfoSpot 50.
The subject of this user manual is the ComfoSpot 50 in series production. 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 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.
Instructions on the operation of the ComfoSpot 50.
Instruction in the maintenance of the ComfoSpot 50.
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.
WARNING
Unless otherwise specified in this user manual, only a qualified person is authorised to install and commission the
ventilation unit and to carry out servicing.
Conformity
The ComfoSpot 50 series ventilation units from the manufacturer
PAUL Wärmerückgewinnung GmbH
August-Horch-Straße 7
08141 Reinsdorf
Germany
Chemnitz commercial register 21371
comply with the directives and standards of the EU and EAC Declaration of Conformity.

3
2 Introduction and safety
This manual contains information that must be observed for your personal safety and in order to prevent personal injury
and damage to property. This information is highlighted in the form of warning notes, which are shown below according to
the degree of risk.
Hazard classification
DANGER
This signal word indicates a hazard with a high level of risk which, if not avoided, will result in death or serious injury.
WARNING
This signal word indicates a hazard with a medium level of risk which, if not avoided, will result in death or serious injury.
CAUTION
This signal word indicates a hazard with a low level of risk which, if not avoided, will result in a minor or moderate injury.
NOTE
In the meaning of this manual, a note includes important information about the product or the respective section of the
manual to which special attention is drawn.
Safety regulations
Always observe the safety regulations and installation conditions. Failure to observe the safety regulations, installation
conditions, instructions, warnings, and comments in this document can result in personal injury or damage to the unit.
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 in the ventilation system.
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.
Installation, commissioning, and maintenance must be carried out by an authorized person or company, unless
otherwise stated in this document.
Do not disconnect the unit from the power supply unless instructions to the contrary are listed in the manual.
Following installation, all parts that could lead to personal injury are protected by the housing. The unit cannot be
opened without the use of a tool.
Only operate the ventilation unit with the filters inserted, the housing closed and the facade finish applied.
Installation conditions
The acceptable temperature range for the air being moved is between -20 °C and +40 °C
The unit must not be installed in rooms subject to explosion hazards
When installing the unit, make sure that the applicable country-specific standards / regulations for compliance with
protection zones when installing electrical systems in rooms with a bathtub or a shower are observed!
The unit must not be used for extracting combustible or explosive gases
The unit must be connected to a fixed 230 VAC / 50-60 Hz power supply
To switch off from the mains, a disconnection system using a contact opening width in accordance with the conditions
from overvoltage category III for complete disconnection must be provided.
Check whether the electrical installation is suitable for the maximum power of the unit.
Check that the installation location of the unit meets the requirements in the “4.1 Installation requirements” chapter.
Notes on the operational safety of the ventilation unit
Operation with fireplaces
Joint operation with fireplaces depending on the indoor air is only permissible in combination with the corresponding
safety devices and in compliance with applicable laws, regulations, and standards.
Observe the applicable regulations in the respective country during planning and installation.
Commissioning and operation
Only operate the ventilation unit when it is installed.
Only operate the ventilation unit with filters fitted.
Only operate the ventilation unit with the upper design cover closed and engaged.
Only operate the ventilation unit with a facade finish.

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WARNING
Risk of injury from touching the fan during operation
Without an exterior wall panel, the fan is freely accessible and there is a risk of contact.
Make sure that the ventilation unit is disconnected from the power supply.
Notes on operation of the ventilation unit
Standard operation of the unit
This unit can be used by children aged 8 and over and also persons with reduced physical, sensory or mental abilities, or
a lack of experience and knowledge provided that they are under supervision or have been instructed on the safe use of
the unit and understand the risks that result from it. Children must not play with the unit. Children must not carry out cleaning
and user maintenance without supervision.
Operating variants
The ComfoSpot 50 offers the following variants that can be combined for convenient operation:
Operation on the unit – standard version with internal control panel.
Operation with ComfoLED – optional: External, wired control panel (max. cable length 25 m).
Radio-based operation – optional: Radio networking via RF module, connection hub and Zehnder Connect app.
NOTE
The external control panel and the connection hub are only suitable for use in indoor areas.
Proper use
The ComfoSpot 50 is intended for the ventilation of living rooms and spaces with a similar use. Any other use or any
use beyond this is considered improper use.
The ventilation unit is intended for use in rooms with a humidity level of approx. 40% to approx. 70% RH. It must not
be installed in rooms where the relative air humidity is permanently above 80% during operation.
The ventilation unit is not suitable for smoke extraction or drying buildings, for rooms with aggressive and corrosive
gases or for rooms with extreme dust levels.
The ventilation unit may only be operated when fully assembled with all the components (including facade finish).
Intended use also includes observing all instructions in the user 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.
Guarantee conditions, warranty and liability
Guarantee conditions
The manufacturer grants a guarantee of 24 months from installation or a maximum of 30 months from the date of
manufacture on the device. Warranty claims may only be asserted for material defects and/or design faults that have
occurred during the warranty period.
The costs of removal and installation on site are not covered by the warranty. The same applies to natural wear and tear.
Zehnder reserves the right to change the design and/or configuration of its products at any time with no obligation to adjust
products already supplied accordingly.
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.
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 and without a facade finish.
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 ComfoSpot 50 is intended for the ventilation of apartments, offices and similar rooms. Every other use is deemed as
"improper use", and can lead to damaging the ComfoSpot 50, or to personal injury, 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.

5
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.
Operation of the unit without filters and without a facade finish.
Storage
NOTE
Store the ventilation unit in its original packaging in a dry place at temperatures between 0°C and +40°C.
Environmentally friendly disposal
NOTE
Packaging materials, consumables and waste equipment must be disposed of at the end of their useful life in accordance
with the applicable regulations in your country.
3 Chapter for operators and qualified personnel
Product description
The ComfoSpot 50 is built to the current state of the art and the recognized safety regulations. The unit is subject to
continuous improvement and development. This is why it is possible for your unit to deviate slightly from the description.
Unit design and function
The ComfoSpot 50 is a decentralised comfort ventilation unit, with heat and humidity recovery, using synchronous supply
and extract air operation.
The ventilation unit is designed for permanent operation and is only to be taken out of operation for maintenance and repair
work. With the appropriate (optional) sensor technology in the unit, fully automatic, demand-controlled ventilation operation
is possible.
An enthalpy exchanger, which can transfer both humidity and heat owing to the physical characteristics, is used in the
ComfoSpot 50 for the heat recovery. The unit body, made from a high-quality polypropylene, is used for accommodating
the essential unit components, and also makes sure there is the necessary heat insulation and unit soundproofing.
Both of the maintenance-free centrifugal fans are driven by energy-efficient EC direct-current motors. The fan output in the
form of the air volume flow can be adjusted in four stages. In the automatic operating mode, the air volume flow is
continuously controlled.
The air passage openings attached on both sides of the interior cover for the supply and extract air can be manually closed
or opened using adjustable shutters by means of a thumb wheel.
The ventilation unit requires very little maintenance, but it is important to change the air filter regularly. Inside the unit, there
is a filter with filter class ISO coarse 70% for the outdoor air and another one for the extract air in serial production.
Optionally, a filter of filter class ISO ePM10 80% can be used for filtering the outdoor air.
The exterior and interior wall panels are made of impact-resistant plastic (ABS). The surfaces are moulded with a white,
matt structure and can be painted overusing a solvent-free facade or interior paint. A stainless-steel outdoor air exhaust
air cowling can be used as an alternative facade finish.

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Overview of assemblies
Type label
The type label identifies the product unequivocally. The type label is located on the bottom cover of the interior cover. 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
must be attached permanently on the product.
Frost protection
The ComfoSpot 50 is equipped with an automatic frost protection function to prevent the thermal exchanger from icing up.
In working condition, the control unit acting in frost protection mode is activated when required for the four manual fan
speeds as well as in automatic mode.
Operating and display elements of the control panel
The control panel has touch-sensitive buttons and LED status indicators.
NOTE
The ventilation unit can be operated at the same time with the internal and the external control panel.
Item Description
A Facade finish, external wall panel
B EPP housing section pipe extension
C EPP housing section with integrated power supply unit, control board and fans
D Enthalpy exchanger
E Extract air filter ISO Coarse 70 %
F Outdoor air filter ISO Coarse 70 % or ISO ePM10 80 %
G Filter cap made of cellular rubber for outdoor air filter
H Filter cap made of cellular rubber for extract air filter
I Bottom cover of interior cover, with air passage openings on both sides, and flap mechanism
J Thumb wheel for shutter adjustment
K Interior top cover
L Type label
M Control panel carrier with control panel (either at bottom or top of the bottom cover of interior cover)
N Cover for electrical connection
C
A
B
F
D
E
H
I
J
K
G
N
M
L

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The two (+) / (-) keys are used for setting the various fan speeds and operating modes. The ventilation stages and the
Automatic operating mode are indicated with blue LEDs, and the service information with red LEDs.
Description of the operating functions and signals
Icon Description Explanation
Fan speed
operating mode
Manual
The selection for the current fan speed (in total 4 fan speeds with preset
speeds for each fan) is made by using the (+) / (-) buttons.
Touching the (+) button sets the next higher fan speed and touching the
(-) button sets the next lower fan speed.
LED1 lights up
Fan speed 1 (FS1)
Reduced ventilation
The ventilation unit runs at the lowest ventilation level (15 m³/h). This fan
speed can be selected when away and for the purpose of moisture
protection.
NOTE
A cyclically limited reduced ventilation can be set with the Away
operating mode.
LED1-2 light up
Fan speed 2 (FS2)
Nominal ventilation
The ventilation unit runs at a low ventilation level (25 m³/h). This is normal
operation, used to achieve the necessary ventilation for hygienic and
health requirements when users are present.
LED1-3 light up
Fan speed 3 (FS3)
Increased ventilation
The ventilation unit runs at a higher ventilation level (40 m³/h) to reduce
peak loads, e.g. when several people are present.
LED1-4 light up
Fan speed 4 (FS4) Intensive ventilation
The ventilation unit runs at maximum ventilation level (50 m³/h). This fan
speed is used for a fast air exchange.
NOTE
Intensive ventilation for a limited period of time can be set with the
boost ventilation operating mode.
AUTO LED lights up
Automatic
operating mode
(AUTO)
NOTE
The Automatic function can only be activated with a sensor module.
Touching the (+) key from the currently active FS4 transfers the unit to
AUTO fan speed. AUTO fan speed is excited by touching the (-) button,
and the unit is transferred back to FS4.
The Automatic function is visualized by the Automatic LED.
AUTO LED lights up
Bathroom function
operating mode
NOTE
The Bathroom function can only be activated with a sensor module
and configured DIP switch setting.
The fans are operated at maximum speed starting from a relative room
air humidity of 80%. If this limit is not reached, the previously active
operating mode is applied again.
(+) / (-) buttons for selecting
operating mode / fan speed
Symbol
Fault
Symbol
Automatic
LED
Fault
LED
Automatic
LED
Fan speeds
LED
Filter maintenance
Symbol
Filter maintenance
1 2 3 4

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Icon Description Explanation
LED1-4 light up
Boost ventilation
mode
NOTE
The boost ventilation function as temporarily activated fan speed 4 can
only be activated with a configured DIP switch setting.
After the boost ventilation time has elapsed, the unit will be transferred
to the most recently selected fan speed. The fan speed that was active
for longer than 10 s is deemed as the last fan speed. When boost
ventilation is active, the operating modes "Extract air mode" or "Supply
air mode", that may be activated, are retained.
The duration of the boost ventilation function can be set between 5 and
120 minutes by the customer service team using the programming
module.
(Factory setting: 15 minutes)
LED1 lights up
during the active
time phase
Away mode
NOTE
The Away function as temporarily activated fan speed 1 can only be
activated with a configured fan speed 1.
The active operating time of the FS1 can be set between 15 and 59 min/h
by the customer service team using the programming module.
(Factory setting: 60 min/h ≙FS1 permanent operation).
LED display for
energy-saving
mode
The LED display on the control panel changes after 10 seconds into
energy-saving mode without operator input (unit functions remain active;
the LED display is switched off). If any key is touched, the LED indicator
will be activated again. Touching the button brings about no change to
the operating mode, however.
Standby mode The unit can be switched from FS1 to Standby mode by touching the (-)
button. The fans then come to a stop.
NOTE
The shutters for the air passage openings must be closed using a
thumb wheel.
Standby mode is excited by touching the (+) button. The unit will start
with fan speed 1.
NOTE
Closed shutters must be opened again beforehand using the thumb
wheel.
There is no indication of the Standby mode from the LEDs of the control
panel.
LED1 flashes in
alternation with the
current fan speed
Extract air mode Touching the (-) key for 5 seconds in operating modes FS1 to FS4
activates or deactivates the Extract air mode. The supply air fan is
switched off; the extract air fan continues to run with the current fan
speed.
The display for the current fan speed alternates every 2 seconds with the
flashing LED1.
LED4 flashes in
alternation with the
current fan speed
Supply air mode Touching the (+) key for 5 seconds in operating modes FS1 to FS4
activates or deactivates the Supply air mode. The extract air fan is
switched off; the supply air fan continues to run with the current fan
speed.
If the outdoor temperature falls below 13 °C, the extract air fan will be
activated.
The display for the current fan speed alternates every 2 seconds with the
flashing LED4.

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Options for ventilation operation
The ComfoSpot 50 can also be equipped with optional accessories for convenient operation and demand-controlled
ventilation mode.
NOTE
Ventilation operation by means of optional accessories requires the installation and configuration of those accessory
components.
External control panel
The Zehnder ComfoLED external control panel offers the possibility to operate the ventilation unit at a distance from the
integrated control unit. The operating and display elements of the external control panel correspond to those on the internal
control panel installed on the unit. If an external control panel is installed, the internal control panel supplied as standard
remains fully functional.
Operation via networking
3.2.2.1 Operation via radio module
Ventilation units in a ventilation zone can be easily networked with each other using radio modules. The function of the
ventilation units is synchronised. The settings are still made on the internal or external control panels.
Mixing systems with ComfoAir 70 series ventilation units in a common ventilation zone are possible.
3.2.2.2 Operation via the connection hub and Zehnder Connect App
Using the connection hub and Zehnder Connect App, ventilation units with a radio module in a residential unit can be
conveniently operated via a mobile device. This allows complex networks to be set up. The central point of these networks
is the Zehnder connection hub. It serves as an interface between the ventilation units, the mobile end devices (app) and,
if available, a WLAN network with Internet connection for operating the units while away.
Mixed systems with ComfoAir 70 series ventilation units in a common residential unit are possible.
Icon Description Explanation
LEDs1-3 flash
Flashing of most
recently active fan
speed when supply
air fan is switched
off
(Display of LED1-3
as example)
Frost protection
mode
From an outside air temperature of -4°C, the frost protection function is
automatically activated.
In frost protection operating mode, the ratio between the supply air and
extract air volume flow is automatically adjusted depending on the
outside air temperature, and the unit is shut down if the outside air
temperature is lower than -15°C. A check is made regularly as to whether
the temperature conditions in regard of frost protection have changed,
and the respective operating mode (requiring frost protection) is
activated automatically according to the result of that check.
After the unit is switched off, a flashing in those LEDs (by touching the
(+) or (-) key) which denoted the most recently active fan speed will be
signalled. The fan speed cannot be changed and is signalled with the
flashing of Fault LED
NOTE
Changing from a higher to a lower fan speed may not be possible
depending on the currently active frost protection routine.
Fault LED flashes
Indication of
locked modes
If an inaccessible operating mode is selected, it will be signalled by the
flashing of Fault LED.
These operating modes are the locked standby, locked supply and
extract air mode and complete switch-off due to frost protection.
LED filter
maintenance
flashes
Indication Filter
maintenance
The filters are monitored based on running time. 90 days are preset by
default.
After the filter runtime has elapsed, notification in regard of a filter
maintenance is signalled by the filter maintenance LED flashing.
Simultaneously touching the (+) and (-) keys for 3 seconds allows you to
acknowledge the indication of the filter maintenance and to reset the filter
runtime.
Fault LED lights up
Error code LED1-4
Signalling of error
code fault
message
If an error occurs, this is signalled by the fault LED.
Faults that can be diagnosed by the unit are symbolized by LED1-4 using
an error code.
Simultaneously touching the (+) and (-) keys for 3 seconds allows you to
delete the indication of the fault notification.

10
Automatic operation via sensor module
The application of the Automatic function follows the logic of a demand-controlled system for optimizing the indoor air
quality. Consequently, an optimized response is achieved, and mildew formation is prevented, which ultimately also leads
to an increase in energy savings. The ventilation unit of the ComfoSpot 50 series with a sensor module is classified in
energy efficiency class A.
NOTE
The automatic operating mode switches to frost protection operating mode if frost protection criteria are met.
3.2.3.1 Functional principle of HUMIDITY sensor
NOTE
The HUMIDITY sensor module is primarily supposed to be installed in units for the ventilation of rooms with an increased
occurrence of humidity.
The HUMIDITY sensor module is equipped with a combined humidity and temperature sensor and calculates the relative
humidity. In the evaluation of the current sensor signal for the setpoint selection, the fans are regulated in accordance with
the characteristic curve in diagram 1. Since the dehumidification performance decreases the smaller the temperature
difference between indoor and outdoor air, at a difference of T < 5 K the air volume is reduced to 20 m³/h. When the
Bathroom function operating mode is active, the unit will be operated with the highest fan speed if the relative humidity
amounts to 80% or more.
Diagram 1: Factory setting characteristic curve for Automatic operating mode with humidity control
3.2.3.2 Functional principle of CO
2
/ VOC sensor
NOTE
The CO
2
sensor module and the VOC sensor module are each combined with a humidity/temperature sensor.
The CO
2
sensor module and the VOC sensor module both offer the option to evaluate relative air humidity as well as the
air quality for controlling the ventilation unit. The VOC sensor module detects volatile organic compounds (VOC) and the
CO
2
sensor module, as NDIR sensor (nondispersive infrared sensor), detects carbon dioxide (CO
2
). Volatile organic
compounds correlate with the CO
2
concentration in living spaces. In the evaluation of the current sensor signal for the
setpoint selection, the fans are regulated in accordance with the characteristic curve in diagram 2.
Diagram 2: Factory setting characteristic curve for Automatic operating mode with CO
2
/ VOC control
NOTE
The CO
2
and VOC sensor modules combined with a humidity/temperature sensor can be deactivated separately if
needed, in accordance with the humidity or air quality control. The HUMIDITY sensor technology is primarily supposed
to be installed in units for the ventilation of rooms with an increased occurrence of humidity. However, if both sensor
functions are configured as active, the control characteristic of the higher sensor signal becomes effective.
The required hardware settings on the control system are only allowed to be made by qualified personnel.
0
10
20
30
40
50
0 102030405060708090100
Volume flow [m³/h]
Rel. humidity [%]
Humidity control
0
10
20
30
40
50
400 600 800 1000 1200 1400 1600 1800 2000
Volume flow [m³/h]
Concentration CO2 [ppm]
CO2 / VOC control

11
Maintenance by the user
Maintenance work on the ventilation unit is limited to filter replacement and external cleaning as required.
NOTE
If the maintenance work is not carried out regularly, this will affect the functionality of the ventilation unit in the long run,
in particular in the case of a failure to perform filter maintenance.
Filter maintenance
The ventilation unit has a runtime-controlled filter monitoring system with visual indication via the filter maintenance LED.
The filter monitoring period is 90 days as standard but can be adjusted to a period of between 30 and 180 days by the
customer service department using a programming module.
NOTE
If the air is heavily polluted (e.g. with road traffic, industrial use, in rooms with increased dust levels), change the filters
every three months.
3.3.1.1 Replacing the air filter
NOTE
The ventilation unit must not be operated without filters. During filter maintenance, the unit needs to be transferred to
the Standby operating mode.
The ventilation unit is equipped with two air filters of filter class ISO Coarse 70% as standard. Retrofitting with filters of filter
class ISO ePM10 80% is possible, preferably the higher quality ePM10 filter is inserted into the lower filter compartment
as an outdoor air filter. No tools are needed to change the air filter. Proceed as follows with the relevant filter maintenance
LED signal:
1. Put the unit into the Standby operating mode.
2. Take off the interior top cover, by disengaging the double locking connection (available on both sides) between the
bottom and top cover of the interior top cover, either on the upper or lower curve (depending on the better accessibility).
To do so, lift the relevant ends of the curved surface on the interior top cover approx. 2-3 mm upwards or downwards
(1.) and pull it out to the front and out of the guides (2.), see figure.
3. Use your finger to grasp at the side between the cellular rubber filter cap and the filter compartment opening of the
bottom cover of the interior cover and pull out the filter cap.
NOTE
Depending on where accessibility is better, first undo the upper or
lower locking connections and remove the respective top cover in
accordance with the step sequence.
1. 1.
2.
1.
1.
2.

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4. Gripping the pulling tabs, pull the filter carefully out of the filter compartment.
5. Insert the filters into the respective filter compartments in accordance with their class.
6. Using the directional arrow of the filter label pointing to the centre of the unit, insert the new filters.
NOTE
An arrow marker for the direction of flow for the filter is engraved on the bottom cover of the interior cover next to the
filter compartment in each respective case. Make sure that the filter is not pushed into the filter compartment with
force.
7. Insert the filter caps again so that the filter compartment is closed evenly.
8. Put the interior top cover onto the bottom cover and press them in the area of the locking connections until you can
hear them engage.
9. Switch the unit back into the desired operating mode.
Filter compartment for extract air filter ISO Coarse
Filter compartment for outdoor air filter ISO Coarse or ISO ePM10

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3.3.1.2 Resetting the filter maintenance display
The filter maintenance indicator must be reset after each air filter change in order to restart the filter maintenance cycle
monitoring. To do this, touch the (+) and (-) keys on the control panel simultaneously for three seconds. The flashing red
filter maintenance LED will go out.
NOTE
As part of filter maintenance for units with a second room connection, check any other air filters that may be present in
the ventilation system.
Unit maintenance
Maintenance of the unit is limited exclusively to the external surfaces of the ventilation unit and the operating surface of
the control panel, which should be wiped down from time to time using a soft, damp cloth – never just wipe dry.
WARNING
Risk due to electric shock
Disconnect the ventilation unit from the power supply before cleaning.
Make sure that no moisture can enter the inside of the housing during cleaning.
Never use a high-pressure cleaner, steam cleaner or steam jet.
NOTE
Never use flammable, acidic, corrosive or abrasive cleaning agents.
What should I do in case of a malfunction?
In the event of a fault message (indicated by the LED fault lighting up continuously), contact customer service.
Information about the type of your ComfoSpot 50 can be found on the type label, which is located under the design cover
of the unit.
NOTE
As a reaction to a fault status, the fans are shut down.
As soon as there is a disconnection, the apartment will no longer be mechanically ventilated. This may result in moisture
and mould problems in the room that requires ventilation.
4 Chapter for qualified personnel
Installation requirements
The following requirements must be assured for the correct installation:
Installation in accordance with the general and locally applicable safety and installation regulations from, among others,
the electric utility, and in accordance with the regulations stipulated in this manual.
Outside wall with final construction thickness of minimum 335 mm.
Sufficient space from objects and for maintenance work (at least 10 cm on extract air side, 20 cm on the supply air
side, 70 cm at the front, and 2 cm above the unit), with regard to the housing surfaces when installed.
Minimum distances on the facade side of 10 cm for outdoor air and 20 cm for exhaust air; rrecommended suction
opening for the outdoor air with respect to the ground >1 m, however, at least unpolluted air in the suction area t.
Electrical connection for stationary units for a working voltage range between 100–240 VAC / 50–60 Hz.
Packaging and handling
The ventilation unit and the facade finish are packed in a transport-safe box. Proceed with care when unpacking and
handling the ComfoSpot 50.
NOTE
Do not damage or dispose of the packaging before final installation of the ventilation unit.
Checking the scope of delivery
If damages or incompleteness should be determined at the delivered product, please contact the supplier immediately.
Included in the scope of delivery are:
ComfoSpot 50, including installation kit
Facade finish including installation set
User manual
Product labels for energy-efficiency label

14
Installation
General installation requirements
The ComfoSpot 50 is intended exclusively for installation in an outside wall, where the side air passage openings must be
located on the inner side, vertically and with the thumb wheel for shutter adjustment on the right side.
The following requirements and precautions at the installation site must be taken into account:
WARNING
Observe accident prevention regulations
Observe the accident prevention regulations when setting up the installation site.
Secure the outside area against falling parts.
WARNING
Danger due to escaping gas or electric shock
Make sure that there are no supply lines (e.g. electricity, gas, water) in the area of the external wall opening.
Ensure that the external wall opening meets the static requirements on site.
WARNING
Risk due to electric shock
Observe the country-specific standards/regulations for compliance with the protection areas for installation in rooms
with a bathtub or shower with regard to the IP11 degree of protection applicable to the ventilation unit.
NOTE
The electronics/control unit can be damaged by static charge; which is why you must always take measures to prevent
electrostatic discharge when handling the control unit (e.g. by wearing an anti-static armband).
Installation preparations
4.2.2.1 Preparations for installing the wall mounting pipe
Prior to installing the ventilation unit, an appropriate wall mounting pipe must already be installed in the outside wall at the
designated installation location. It must be adjusted flush with the dimensions of the final wall structure.
The square wall mounting pipe, intended in particular for new buildings, should be integrated in the outside wall construction
in the course of constructing the outside wall. The round wall mounting pipe is to be inserted after drilling a core hole (
340 mm) into the drill hole of the outside wall.
NOTE
Installation of the ComfoSpot 50 requires the use of the round or square wall mounting pipe.
Observe the respective enclosed instructions on professional installation when installing the wall mounting pipe.
4.2.2.2 Preparations for installing electrical connections
The mains supply line for the power supply must be installed in the area of the bottom left side of the unit and, where
applicable, the control cable for connecting an optional external control panel, must be installed up to the area of the bottom
right side of the unit. The cable ends should protrude approx. 10 cm out of the wall surface in the respective area of the
cable entry point of the bottom cover of the interior cover.

15
Installing the ventilation unit
DANGER
Fatal voltages
Disconnect all poles of the mains cable intended for connection to the ventilation unit from the power supply before
carrying out installation and maintenance work.
Proceed as follows for the installation of the unit:
NOTE
Optional accessories, such as sensor modules and wireless or wired operating modules, must be fitted into the unit
before installation. For this purpose, use the installation instructions enclosed with the respective accessories.
If necessary, the internal control unit on the bottom cover of the interior cover must also be moved before installation in
the dismantled state.
1. Adjust the installation length of the unit either to the wall thickness or to the measure of length of the wall mounting pipe
by shortening the EPP housing extension.
NOTE
The cut must be performed all around, perpendicular to the axis of the EPP
pipe extension.
2. Remove the interior cover from the bottom cover, whilst considering the explanations given in 3.3.1.1, section 2.
3. Take off the cover for the electrical connection by undoing the yellow PVC nut.
4. Insert the unit, together with the bottom cover of the interior cover, as far as it will go into the wall mounting pipe, whilst
considering the position of the openings for the electrical connections.
NOTE
Spray silicone spray onto the interior of the wall mounting pipe.
If necessary, a suitable tool can be used to remove the centring spring raised 5 mm, and arranged 3 times on the
EPP housing, to the dimension 300 of the EPP basic body, in order to facilitate the insertion.

16
5. Align the unit with the side air intake grills of the bottom cover of the interior cover being vertical. Transfer the drill hole
onto the wall (in conjunction with the round wall mounting pipe) or onto the EPP housing for the square wall mounting
pipe.
NOTE
The vertical installation of the bottom cover of the outside wall panel requires
the precise horizontal positioning of the bottom cover of the interior cove.
6. Pull the unit out of the wall mounting pipe again. Drill a drill hole and install the dowel from the installation set or a
different dowel suitable for the material.
NOTE
When the square wall mounting pipe is installed, the plasterboard dowel must be screwed into the EPP housing of
the wall mounting pipe, and the bottom cover must be fastened using the countersunk wood screw! The plasterboard
dowel and countersunk wood screw are an integral part of the installation set for the square wall mounting pip.
7. Slide the unit back into the wall mounting pipe as far as it will go, whilst considering the position of the openings for the
electrical connections, and fix the bottom cover of the interior cover in place using the screw from the installation set or
the alternatively selected fixing material.
Relocating the internal control panel
The control panel can be positioned for optimum accessibility either at the top or bottom of the interior cover of the unit,
depending on the ventilation unit's wall mounting height.
Relocating this can be done as follows if the interior top cover is removed:
1. Take the ribbon cable out of the cable retainer in the connection area of the control pane .
2. Cautiously pull the control panel using the two interlocking fixings (at the side) off the control panel carrier, and guide
the control panel, together with the still connected ribbon cable, out of the control panel carrier for better handling.
3. Disconnect the ribbon cable from the board for the control panel, by pulling the ribbon cable's plug (gripping with two
fingers) out of the socket located on the board. Meanwhile, hold the control panel tight in the area of the plug connection
using two fingers on your other hand. Remove the ribbon cable from the cable retainers and guide it back to the opening
and into the bottom cover of the interior cover.

17
NOTE
Pull the plug of the ribbon cable cautiously out of the post connection.
4. Undo and remove the two screws for fastening the control panel carrier, bring them onto the opposite side, and fasten
the control panel carrier equally on the two screw-in mandrels.
5. Guide the ribbon cable through the frame opening of the bottom cover and the control panel carrier. Restore the plug
connection between the ribbon cable and control panel.
NOTE
Watch out for the reverse polarity protection for the post connection
when connecting.
6. Install the ribbon cable in the designated fixing points, taking care to produce a smooth overlapping in the vicinity of the
90° bends. Then snap the control panel onto the control panel carrier in the correct position.
NOTE
When positioning the top cover, make sure that the cut-out on the
curved surface of the top cover is on the side of the control panel.

18
Electrical connections
WARNING
The activities described in this chapter may only be carried out by skilled personnel with the following
qualifications:
Training on the installation and commissioning of electrical units.
Training on electrical hazards and local safety regulations.
Knowledge of the relevant standards and guidelines.
Fat Fatal voltages
Fatal voltages
Only a qualified electrician may carry out the electrical installation.
The VDE regulations or the special safety regulations of your country apply to the electrical installation.
Observe the five safety rules (DIN VDE 0105-100 when working on electrical systems:
Disconnect (all-pole disconnection of a system from live parts)
Secure against restarting
Determine absence of voltage
Grounding and short-circuiting
Cover or block off adjacent live parts
Der The power supply is connected after the final positioning of the unit in the wall mounting pipe. In doing so, proceed as
follows:
1. Plug the WAGO lighting terminals (3 pieces included in the installation set) with the plug-in terminal connector for solid
conductors onto one stripped wire of the mains supply line each.
2. Connect one wire of the unit connecting cable respectively to the clamping connection for the stranded wire of the
WAGO luminaire terminal for the L-conductor and the N-conductor. The WAGO luminaire terminal of the PE conductor
remains unassigned (ventilation unit corresponds with protection class II – protective insulation).
3. Install the connections orderly and space saving so that the mounting of the plastic cover for the electric connections
can be done without difficulty.
4. Mount the plastic box for covering the electrical connection and fix it in place on the right-hand side using the yellow
PVC nut and on the left-hand side using the designated screw for fixing the unit on the wall.