Zehnder Rittling ComfoSpot 50 User manual

Decorative Radiators Comfortable indoor ventilation Heating and cooling ceiling systems Clean air solutions
Operating and installation instructions for user and installer
Zehnder ComfoSpot 50

EN
Legal regulations
All rights reserved.
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.
Trademarks
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.
© 2017 Zehnder Group

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Contents
0Preface .................................................................................................................................... 5
Validity...................................................................................................................................... 5
Target group and standard operation ...................................................................................... 5
Qualification of target group..................................................................................................... 5
0.2.1.1 Users........................................................................................................................................ 5
0.2.1.2 Qualified personnel.................................................................................................................. 5
Standard operation of the unit.................................................................................................. 5
1Introduction and safety ......................................................................................................... 5
Proper use................................................................................................................................ 5
Ventilation unit ComfoSpot 50 ................................................................................................. 5
Control panels.......................................................................................................................... 5
Safety....................................................................................................................................... 6
Safety regulations .................................................................................................................... 6
Installation conditions............................................................................................................... 6
Symbols used........................................................................................................................... 6
Warranty and liability................................................................................................................ 6
Warranty provisions ................................................................................................................. 6
Liability ..................................................................................................................................... 7
2Instructions for the user and qualified personnel.............................................................. 7
Product description .................................................................................................................. 7
Type label................................................................................................................................. 8
Frost protection ........................................................................................................................ 8
2.1.2.1 ComfoSpot 50 frost protection mode....................................................................................... 9
Joint operation with fireplaces.................................................................................................. 9
Functionality of the internal and external control panel ........................................................... 9
Operating functions and signalling from the control panel....................................................... 9
Automatic operating mode..................................................................................................... 11
2.3.1.1 Functional principle of HUMIDITY sensor.............................................................................. 11
2.3.1.2 Functional principle of CO2/ VOC sensor.............................................................................. 12
Maintenance by the user........................................................................................................ 12
Replacing the unit filters......................................................................................................... 13
Resetting the filter runtime..................................................................................................... 15
What should I do in case of a malfunction?........................................................................... 15
Disposal.................................................................................................................................. 15
3Instructions for the qualified personnel............................................................................ 15
Installation requirements........................................................................................................ 15
Transport and packaging ....................................................................................................... 15
Checking the scope of delivery.............................................................................................. 15
Installation.............................................................................................................................. 15
General installation instructions............................................................................................. 15
Installation preparations......................................................................................................... 16
Installing the ventilation unit................................................................................................... 16
Electrical connections ............................................................................................................ 18
3.2.4.1 Connection for power supply.................................................................................................. 18
3.2.4.2 Relocating the internal control panel...................................................................................... 19
3.2.4.3 Connecting the external control panel ................................................................................... 21
3.2.4.3.1 Connecting the cable for the external control panel on the ventilation unit........................... 21
3.2.4.3.2 Connection to the external control panel ............................................................................... 23
3.2.4.4 Installing and connecting the sensor module......................................................................... 23
Parameterizable operating modes......................................................................................... 26

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3.2.5.1 Configuration of Automatic operating mode........................................................................... 26
3.2.5.2 Configuration of the boost ventilation mode........................................................................... 26
3.2.5.3 Configuration of the Away mode............................................................................................ 26
Installing the outside wall panel............................................................................................. 26
Maintenance and repair by the qualified personnel............................................................... 28
Inspection and cleaning of enthalpy exchanger..................................................................... 28
Replacing the fans ................................................................................................................. 30
Exchanging the control board ................................................................................................ 30
Visualization of fault notifications........................................................................................... 31
Fault codes in the Fault status............................................................................................... 31
Technical description ............................................................................................................. 32
Dimensions ............................................................................................................................ 33
Terminal scheme.................................................................................................................... 34
4Appendices........................................................................................................................... 35
Checklist A Maintenance work for users................................................................................ 35
Checklist B Maintenance work for qualified personnel.......................................................... 36
Commissioning and handover protocol.................................................................................. 37
Air volume protocol ................................................................................................................ 38
Product data sheet................................................................................................................. 39
Product label.......................................................................................................................... 40
Conformity.............................................................................................................................. 41

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0 Preface
Validity
This document applies to:
•Unit types ComfoSpot 50 series
These unit type series are hereinafter designated with the common product name, ComfoSpot 50.
The subject of this manual is the ComfoSpot 50 in its various design variants. 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 group and standard operation
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
0.2.1.1 Users
Users must be instructed by qualified personnel as follows:
•Instruction in hazards when handling electrical devices
•Instruction in the system’s operation
•Instruction in the maintenance of the ComfoSpot 50
•Knowledge of and compliance with this manual, including all safety instructions.
0.2.1.2 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
Unless otherwise stated in this manual, only a recognized qualified person is authorized to install, connect up, commission,
and to service the ComfoSpot 50.
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.
1 Introduction and safety
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.
Proper use
Ventilation unit ComfoSpot 50
The ComfoSpot 50 can be used for comfortable ventilation in living and office areas (with limitations in the commercial
sector) at a normal room air humidity of approx. 40 – 70% RH, briefly up to approx. 80% RH. Any other type of use is
considered as misuse. Extreme conditions (e.g. salty air or air polluted with chlorine) can damage the unit. For reasons of
safety, it is prohibited to modify the product or to install components that are not explicitly recommended or distributed by
Zehnder Group for this product.
Control panels
The ventilation unit is equipped with an internal control panel. As an option, an external control panel can be connected to
the unit using a cable of max. 25 m length. The external control panel is only suitable for use in indoor areas.

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Safety
Always observe the safety regulations and installation conditions in the current operating manual. 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.
Safety regulations
•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
•Always comply with the general locally-applicable building, 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
•Always disconnect the unit from the power supply before you start working on the ventilation system
•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
•Do not disconnect the unit from the power supply unless instructions to the contrary are listed in the manual
•The 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. antistatic wrist strap)
•Replace the filters (at least) every six months. This ensures a pleasant and healthy air quality, and the unit will be
protected against contamination
•Only operate the unit with a closed housing
•Keep this document in the vicinity of the unit during the entire service life of the ventilation unit
Installation conditions
•Check that the installation area is frost-protected
•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 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. The values for the electrical
input power can be found in the "Product data sheet" chapter
•Check that the installation area of the unit meets the requirements in the "General installation instructions" chapter
Symbols used
You will find the following symbols in this document:
Important note!
Caution: Risk of affecting the operation of the ventilation system or damaging the unit!
Caution: Risk of personal injury!
Warranty and liability
Warranty provisions
Warranty according to our general terms and conditions (http://www.international.zehnder-systems.com/company/general-
terms-and-conditions). Warranty claims can only be asserted for material defects and/or design faults that have occurred
during the warranty period. Repair work under the warranty conditions is only allowed to be carried out with the prior and
written approval by Zehnder Group. A warranty on spare parts is only then given if those parts have been delivered by the
manufacturer and were installed by an installation technician recognized by the manufacturer.
The warranty shall be null and void if:
•the warranty period has elapsed
•the unit is operated without filters released by the manufacturer of the ventilation unit
•parts are installed that are not supplied by the manufacturer
•the unit is used improperly
•the defects occur as a consequence of an incorrect connection, improper use, or from system contamination
•unauthorized changes or modifications to the system are made

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Liability
The ComfoSpot 50 was developed and manufactured for the decentralized ventilation of living areas and functional 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 manufacturer shall not be liable for any kind of damage that can be attributed
to the following causes:
•Failure to observe the instructions listed in this manual pertaining to safety, operation and maintenance
•Improper installation
•Installation of spare parts that were not delivered or stipulated by the manufacturer
•Defects as a consequence of an incorrect connection, improper use or from system contamination
•Normal wear
2 Instructions for the user and qualified personnel
Product description
The ComfoSpot 50 is a decentralized ventilation unit with heat recovery for a healthy, well-balanced, and energy-saving
comfort ventilation. The unit is used as a single room unit (replacing the air for one and the same room). Here, stale,
odorous air is extracted and carried outside via the extract/exhaust air section on the outside wall panel; simultaneously,
an equal amount of fresh air is introduced into the same room via the outdoor/supply air section on the inner casing of the
unit.
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.
The ComfoSpot 50 has two maintenance-free 24 VDC radial fans with electronic commutation. These fans and the control
board receive the required operating voltage via an integrated 230 VAC / 24 VDC power supply unit.
By default, a filter (in filter class G4) is used in the unit for the outdoor air and the extract air. As an option, filters in class
F7 with pollen filter quality can be used for the outdoor air.
The housings for 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 over using a solvent-free façade or interior paint. A stainless steel outdoor
air exhaust air cowling can be used as an alternative.
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 per thumb wheel.

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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 control system, which prevents ice from forming in the
heat exchanger at very low outdoor air temperatures. If needed, the frost protection mode is activated both in the four
manual fan speeds and in the Automatic fan speed.
Item Description
A Outside 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 G4
F Outdoor air filter G4 (optional F7)
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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2.1.2.1 ComfoSpot 50 frost protection mode
In frost protection mode, the ratio between the supply air and extract air volume flow is automatically adjusted depending
on the outside air temperature by the control system, and the unit is shut down if the outside 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.
Joint 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.
Functionality of the internal and external control panel
The internal control panel has a short-stroke button, which means the respective operating functions are triggered by
pressing the relevant buttons. The external control panel has touch-sensitive buttons and responds to touching the buttons.
The ComfoSpot 50 can be operated at the same time with the internal and the external control panel. The button
assignments and the LED signalling in both control panels are identical in terms of functions.
The two buttons 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.
Operating functions and signalling from the control panel
Icon Description Explanation
LED1 lights up
LED1-2 light up
LED1-3 light up
LED1-4 light up
Fan speed
operating mode
Fan speed 1 (FS1)
Fan speed 2 (FS2)
Fan speed 3 (FS3)
Fan speed 4 (FS4)
The selection for the current fan speed (in total 4 fan speeds with preset
speeds for each fan) is made by using the (-) / (+) buttons.
Pressing the (+) button sets the next higher fan speed, and pressing the
(-) button sets the next lower fan speed
(-) / (+) buttons for selecting
operating mode / fan speed Symbol Fault
Symbol
A
utomatic
LED Fault
LED Automatic
LED Fan
speeds LED Filter
replacement
Symbol Filter
replacement
1 2 3 4

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AUTO LED lights up
Automatic
operating mode
(AUTO) The Automatic function can only be activated with a sensor
module.
Pressing the (+) button from the currently active FS4 transfers the unit to
AUTO fan speed. AUTO fan speed is exited by pressing 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 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.
LED1-4 light up
Boost ventilation
mode 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 boost ventilation time of 15, 30 or 45 minutes can be set by the
Customer Service with the programming module.
(Factory setting: 15 minutes)
LED1 lights up
during the active
time phase
Away mode 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 fan speed 1 of 15, 30, or 45 min/h can be
set with a programming module by customer service.
(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 button is pressed, the LED display
will be activated again. The pressing of a button brings about no change
to the operating mode.
Standby mode The unit can be switched from FS1 to Standby mode by pressing the (-)
button. The fans then come to a stop.
The shutters for the air passage openings must be closed
using a thumb wheel!
Standby mode is exited by pressing the (+) button. The unit will start with
fan speed 1.
Closed shutters must be previously opened again 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 Pressing the (-) button 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.
To avoid condensation appearing on the outside wall panel, the unit
automatically changes to the frost protection mode when the frost
protection temperature is reached. The supply air fan is activated for
several minutes every hour in order to record the correct outside air
temperature.

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Automatic operating mode
Automatic operating mode requires an internal installation and configuration of a sensor module! The
sensor modules inserted in the extract air section of the ventilation unit are available as optional
accessories.
The Automatic function changes into the frost protection operating mode in the event of frost protection
criteria being met!
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 ComfoSpot 50 ventilation unit with a sensor module is classified in energy efficiency class A.
2.3.1.1 Functional principle of HUMIDITY sensor
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 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 ΔT < 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.
LED4 flashes in
alternation with the
current fan speed
Supply air mode Pressing the (+) button for 5 seconds in operating modes FS1 to FS4
activates or deactivates the Supply air mode. The extract air fan is
switched off; the supplyair 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.
Flashing of most
recently active fan
speed when supply
air fan is switched
off
(Display of LED1-3
as example)
Frost protection
mode
A temperature threshold, which activates its own frost protection routine if
not reached, is stored for each fan speed. The fan speed of the supply air
will be regulated linearly between the minimum and maximum set point
when the outside temperature is dropping. The fan speed can still be
changed.
The supply air fan is deactivated if a second temperature threshold is not
reached.
If the outside temperaturefalls below the temperature limit threshold of -15 °C,
the extract air fan will also be deactivated and the unit switched off.
After the unit is switched off, a flashing in those LEDs (by touching the (-)
or (+) button) 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.
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
replacement flashes
Indication of filter
inspection 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
inspection is signalled by the filter replacement LED flashing.
Simultaneously pressing the (-) and (+) button for 3 seconds allows you to
acknowledge the indication of the filter inspection 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 (see 3.4.1).
Simultaneously pressing the (-) and (+) button for 3 seconds allows you to
delete the indication of the fault notification.

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Diagram 1: Factory setting characteristic curve for Automatic operating mode with humidity control
2.3.1.2 Functional principle of CO
2
/ VOC sensor
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 really well 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
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. If both sensor modules are
configured as active, the control characteristic of the sensor module is designed with the greater sensor
signal.
The required hardware settings on the control system are only allowed to be made by qualified personnel!
Maintenance by the user
If the maintenance work is not carried out regularly, this will affect the functionality of the ventilation unit
in the long run!
The maintenance of the ventilation unit for the user is limited to changing the filters periodically and to cleaning the unit on
the surface, if needed. Check the filters if this is indicated by the filter replacement LED.
Replace the filters at least every six months. This ensures a pleasant and healthy air quality, and the unit
will be protected against contamination.
Cleaning the surface of the unit, and specifically the control panel, is possible using a damp cloth and a
mild soap solution. Never just wipe it dry!
Unsuitable cleaning agents are:
•Alcohol (> 5%)
•Acetone
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

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•Benzene or carbon tetrachloride
•All types of "strong" cleaning agents
•Scouring agents
•Glass cleaners and similar
Replacing the unit filters
The ComfoSpot 50 must not be operated without filters. When changing filters, the unit needs to be
transferred to the Standby operating mode.
In ComfoSpot 50, two high-quality original filters of the class G4 are installed by default. Retrofitting a pollen filter of the
class F7 is possible. This is inserted into the lower filter compartment (outdoor air filter). The filters in the ComfoSpot 50
must be checked in accordance with the relevant notification on the control panel and, if needed, must be replaced. In
doing so, proceed as follows:
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.
4. Gripping the pulling tabs, pull the filter carefully out of the filter compartment.
Depending on where accessibility is better, first undo
the upper or lower locking connections and remove the
respective internal panel in accordance with the step
sequence!
1. 1.
2.
1. 1.
2.

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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.
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.
Filter compartment for extract air filter (G4)
Filter compartment for outdoor air filter (G4 or F7
)

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9. Switch the unit back into the desired operating mode.
Resetting the filter runtime
After completing the filter replacement, the meter for the filter runtime must be reset. To do this, you can clear the filter
inspection indication again by pressing the (-) and (+) button for 3 seconds. The red LED on the control panel, symbolizing
the filter replacement, switches off.
What should I do in case of a malfunction?
Contact the installation technician in case of a malfunction. Note down the type of your ComfoSpot 50; for more on this,
see the type label on the bottom cover of the interior cover.
The mains connection must always be present, providing the ComfoSpot 50 does not have to be shut down due to a
serious malfunction, maintenance work, or due to another urgent cause.
As soon as a mains disconnection is made, the apartment will no longer be mechanically ventilated. This
makes it possible for problems involving moisture and mould to occur in the apartment. A longer period
of being switched off, particularly during the summer months, brings about the danger of accumulating
insects in the inside of the outside wall panel and in the EPP housing section of the pipe extension!
The ventilation unit must be permanently left in operation, excepting times needed for maintenance and
repair work. The unit should be operated in the Away mode for the duration of an absence!
Disposal
Discuss with your supplier what you should do with your ComfoSpot 50 at the end of its life cycle. If you cannot return your
ventilation unit, do not dispose of it with the normal household waste, but rather contact your local authority for options to
recycle components or to process materials in an environmentally-friendly way.
3 Instructions for the 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 275 mm
•Sufficient clearance to objects and for maintenance work (at least 10 cm on extract air side, 20 cm on the supply
air side, and 70 cm on the front side), with regard to the housing surfaces when installed
•Recommended suction opening for the outdoor air with respect to the ground >1 m, however, at least unpolluted
air in the suction area
•230 VAC, 50-60 Hz power supply for fixed units
Transport and packaging
Proceed with care when transporting and unpacking the ComfoSpot 50. The ventilation unit, together with mounted interior
cover, and the outside wall panel are packed in a transport-safe box.
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 set
•Outside wall panel including installation set
•Operating and installation instructions
•Product labels for energy-efficiency label
Installation
General installation instructions
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. To mount the
ventilation unit, a wall mounting pipe must be installed into the outside wall in advance; please refer to the respective
installation instructions enclosed for the procedure for installing the wall mounting pipe.

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When planning the installation location, please note that the clearance needs to be 10 cm on the extract
air side and 20 cm on the supply air side for the intended operation. For maintenance work, a free space
of 70 cm should be observed in front of the unit.
The unit has the protection class IP11. Make sure that the applicable country-specific standards /
regulations for compliance with protection zones when installing the unit in rooms with a bathtub or
shower are observed!
Installation preparations
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 level of the finished wall construction.
The installation of the ComfoSpot 50 is only allowed in connection with the round wall mounting pipe or
with the square wall mounting pipe!
The square wall mounting pipe, intended in particular for new buildings, should be integrated in the outside wall construction
in the course of the wall construction. The round wall mounting pipe is primarily used in the refurbishment and
reconstruction of the building fabric, and is inserted in the outside wall by means of a core hole (∅340 mm).
Observe the respective enclosed instructions on professional installation when installing the wall
mounting pipe.
A 230 VAC mains connection for fixed units is to be prepared on site for the mains power supply.
In order to connect an external control panel, a cable must be installed on site between the control panel
and ventilation unit (recommendation: type J-Y(ST)Y 2x2x0.6 LG indoor cable with colour coding in
accordance with VDE 0815).
The mains supply line (e.g. NYM-J 3x1.5) must be installed in the area of the bottom left side of the unit and, where
applicable, the cable to the external control panel, must be installed flush-mounted 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.
Installing the ventilation unit
Prior to starting work, ensure that the mains supply line has no voltage!
The relocation of the internal control panel to the bottom and the installation of a sensor module (optional
accessories) in the unit has to be done prior to installation when the unit is disassembled!
Proceed as follows for the installation of the unit:
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.
The cut must be performed all around, perpendicular to the axis of the EPP pipe extension!
Ø outer wall installation tube
Areas of cable
entry point

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2. Remove the interior cover from the bottom cover, whilst considering the explanations given in 2.4.1, section 2.
3. Take off the cover for the electrical connection by undoing the yellow PVC nut. Spray silicone spray onto the
interior of the wall mounting pipe, and 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.
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!
4. 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.

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The vertical installation of the bottom cover of the outside wall panel requires the precise vertical
positioning of the bottom cover of the interior cover!
5.
Pull the unit out of the wallmounting pipeagain. Drilla drillhole,andinstall the dowel fromtheinstallation
set or a different dowel suitable for the material.
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 pipe.
6. Push the unit back in, and fix in place the bottom cover of the interior top cover to the drill hole using the screw from
the installation set or a screw suitable for the alternatively selected type of fastening.
Electrical connections
Electrical connections are to be implemented in accordance with the existing standards specific to the
relevant country, and must only be performed by qualified personnel!
3.2.4.1 Connection for power supply
Prior to starting work, ensure that the mains supply line has no voltage!
On-site, a disconnection system has to be installed using a contact opening width in accordance with the
conditions from overvoltage category III for complete disconnection in the fixed electrical installation, in
accordance with the installation regulations.
The power supply is connected after the final positioning of the unit in the wall mounting pipe. In doing so, proceed as
follows:
1. Stripping the wires - Slip a WAGO luminaire terminal from the installation kit, together with the plug connection for
solid conductors, onto one wire of the mains supply line respectively.
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).

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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.
3.2.4.2 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 panel
.
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.
Wires for unit connecting cable
Wires for mains supply line

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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.
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.
Watch out for the reverse polarity protection for the post connection when connecting!