Zehnder Rittling ComfoAir Q 350 ST User manual

Cooling Fresh Air Clean AirHeating
Ventilation system Zehnder ComfoAir Q
User manual

2 - EN
Foreword
Read this document carefully before use.
With this document you can operate and perform
the maintenance of the ComfoAir Q in a safe and
optimal manner. In this document the ComfoAir Q
will be referred to as “the unit”. The unit is subject
to continuous development and improvement. Thus
the unit may be slightly different from the given
descriptions.
The pictograms that follow are used in this
document:
Symbol Meaning
Point of interest.
Risk of compromised performance or damage of
the ventilation system.
Risk of personal injury.
Questions
Please contact the supplier if you have any questions
or would like to order a new document or new filters.
The contact details of the main supplier can be
found on the back page of this document.
Use of the unit
The unit may only be used when it is properly
installed according to the instructions and guidelines
in the installer manual of the unit.
The unit can be used by:
�children aged from 8 years and above;
�persons with reduced physical capabilities;
�persons with reduced sensory capabilities;
�persons with reduced mental capabilities;
�persons with lack of experience and knowledge,
if they have been given supervision or instruction
concerning use of the unit in a safe way and
understand the hazards involved.
Children shall not play with the unit. Cleaning and
user maintenance shall not be carried out by children
without supervision.
All rights reserved.
This documentation has been made with the utmost care. The publisher cannot be held liable for any damage
caused as a result of missing or incorrect information in this document. In case of disputes the English version of
the instructions will be binding.

EN - 3
Table of Contents
Foreword.............................................................................................................................................................................2
1 Introduction and safety..................................................................................................................................................5
2 Description................................................................................................................................................................... 6
2.1 Available operating devices ....................................................................................................................................6
2.2 Optional ancillaries ................................................................................................................................................7
2.3 Overview of the unit...............................................................................................................................................8
2.4 Overview of the display..........................................................................................................................................8
2.4.1 Overview of the basic main screen ............................................................................................................... 9
2.4.2 Overview of the advanced main screen ...................................................................................................... 10
2.4.3 Overview of the visual signals of the LED .................................................................................................... 10
3 Operation................................................................................................................................................................... 11
3.1 How to use the display on the unit ........................................................................................................................ 11
3.1.1 Start/stop child lock .................................................................................................................................. 11
3.1. 2 Switch between user modes...................................................................................................................... 11
3.1.3 How to navigate through the menu ............................................................................................................. 11
3.1.4 Manually set the airflow ............................................................................................................................. 11
3.1. 5 Set the airflow to a maximum (BOOST) for a specific duration ...................................................................... 11
3.1. 6 Stop the airflow for a specific duration ........................................................................................................ 11
3.1.7 Set the airflow to a minimum for the period of your absence (PRESET A)....................................................... 11
3.1. 8 Set the temperature profile......................................................................................................................... 11
3.1. 9 Set a schedule ......................................................................................................................................... 12
3.1.10 Manually set the heat recovery control (bypass) for a specific duration.......................................................... 12
3.1.11 Stop the ComfoCool Q600 for a specific duration ....................................................................................... 12
3.2 Menu structure.................................................................................................................................................... 13
3.2.1 RESET ERROR1........................................................................................................................................ 14
3.2.2 TASK MENU ............................................................................................................................................. 14
3.2.3 STATUS (read only) ................................................................................................................................... 15
3.2.4 FILTERS ................................................................................................................................................... 16
3.2.5 BASIC OPTIONS....................................................................................................................................... 16
3.2.6 RESET ALL TASKS.................................................................................................................................... 16
3.2.7 ADVANCED SETTINGS2............................................................................................................................ 16
3.3 Use during disasters............................................................................................................................................ 17
4 Certification and warranty............................................................................................................................................ 18
5 Maintenance .............................................................................................................................................................. 25
5.1 Replace the filters................................................................................................................................................ 25
5.2 Clean the valves .................................................................................................................................................. 26
5.3 Clean the grilles................................................................................................................................................... 26
5.4 Clean the operating device................................................................................................................................... 26
5.5 Fill the condensation drain.................................................................................................................................... 26
6. Malfunctions............................................................................................................................................................... 27
ICommissioning & Inspection Record............................................................................................................................ 28
II Maintenance log ......................................................................................................................................................... 31
1This menu is only visible when errors occur.
2This menu is only visible when the advanced mode is active.

4 - EN

EN - 5
1 Introduction and safety
The unit is a balanced ventilation system with
heat recovery in order to create energy-efficient
ventilation in houses. Balanced ventilation means
that pollutants from the kitchen, bathroom, wc(s)
and possibly the utility room are extracted, while the
same amount of fresh air is supplied into the living
room and bedrooms. Gaps under or near doors
ensure a good through-flow in the dwelling.
Ensure that the gaps under or near doors are
never obstructed. For example by furniture,
draught excluders or deep-pile carpet.
A balanced ventilation system consists of:
�The unit (A);
�Duct system for the intake of outdoor air (B);
�Duct system for the exhaust of indoor air (C);
�Supply valves and/or grilles in the living room and
bedrooms (D);
�Extract valves and/or grilles in the kitchen,
bathroom, wc and (if present) the utility room (E).
Safety instructions
�Always obey the safety regulations, warnings,
comments and instructions given in this
document. When the safety regulations, warnings,
comments and instructions in this document are
not obeyed personal injury or damage to the unit
can occur.
�After installation all parts that can cause personal
injury are secured behind the casing. You need
tools to open the casing;
�The installation, commissioning and maintenance
must be carried out by a certified engineer unless
the instructions state otherwise. A non-certified
engineer can cause personal injury or damage the
performance of the ventilation system;
�Do not modify the unit or the specifications
given in this document. A modification can cause
personal injury or damage the performance of the
ventilation system;
�Do not disconnect the power of the unit, unless
told otherwise in the manual of the unit. This
can lead to a build-up of moisture and result in
problems with mould;
�Replace the filters (at least) every six months. This
will insure a comfortable and healthy air quality
and will protect the unit from pollution;
�Do not open the casing. The installer makes sure
that all parts that can cause personal injury are
behind the casing;
�Place the user manual back on the unit after use.
Then the next reader can find it there.
E
E
C
A
D
B

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2 Description
2.1 Available operating devices
One or more operating devices can be connected to operate the unit. Some devices only provide manual
control, other devices provide additional automatic control. Such automatic control is based on measurements
of temperature, relative humidity or other conditions. One or more of the operating devices that follow can be
connected to operate the unit:
Appearance Example Name Function
Zehnder ComfoSense C 67 For remote manual and automatic control of the unit. The automatic control is
based on the unit settings and adjustable scheduler.
This is a wired control with a wireless receiver.
Zehnder ComfoSwitch C 67 For basic remote manual and automatic control of the unit. The automatic
control is based on the unit settings.
This is a wired control.
Zehnder Control App For remote manual and automatic control of the unit with a smartphone or
tablet. The automatic control is based on the adjustable scheduler.
This is a controller connected to the ComfoConnect LAN C.
Zehnder Timer RF For remote manual control of the unit.
This is a wireless control.
Zehnder CO2sensor For remote automatic control of the unit, based on the amount of measured
CO2.
This is a wired sensor connected to the Option Box.
Bathroom switch To manually switch the unit to the BOOST function from the bathroom.
This is a wired switch connected to the Option Box.

EN - 7
2.2 Optional ancillaries
The installer can combine several devices with the unit to extend the possibilities.
Appearance Example Name Function
Zehnder ComfoFond-L Q
(or regulated sub-soil heat
exchanger)
Pre-condition the temperature of the outdoor airflow before it enters the unit.
This ancillary is connected to the Option Box.
Zehnder ComfoCool Q600 Decrease the temperature and pre-condition the humidity of the supply air.
Zehnder ComfoAir Q pre-heater Increase the temperature of the outdoor airflow in order to protect the heat
exchanger against frost.
Zehnder Option Box Provide additional connectivity options.
Zehnder ComfoConnect KNX C Provide KNX connectivity options.
Zehnder ComfoConnect LAN C Provide LAN connectivity options for remote control.
Standby switch Stop the unit remotely.
This ancillary is connected to the Option Box.
Error contact Remotely check the error status of the unit.
This ancillary is connected to the Option Box.
External filter Filter pollen from the outdoor air.
Post-heater Increase the temperature of the supply air.
This ancillary is connected to the Option Box.
Unregulated sub-soil heat
exchanger
Pre-condition the temperature of the outdoor airflow before it enters the unit.
Extractor Hood
(non powered)
Extract cooking smells and moisture from the kitchen.
A powered extractor hood must never be installed on the same
ducting as the unit. This will compromise the performance of the
system.

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2.3 Overview of the unit
D
A
B
C
Position Part
ASemi-transparent visor for access to the display and the filter caps.
B2 filter caps for easy access to the filters.
C2 filters for air filtering.
DDisplay to operate the unit.
2.4 Overview of the display
AUTO
sensor
SHIFTMENU
Tu 14:02
A
B
C
E
D
Position Part
AStatus indicator LED light.
BUniversal button.
The function depends on the current text on the
display.
CUp button to:
�Increase fan speed;
�Increase value;
�Select the previous item.
DDown button to:
�Decrease fan speed;
�Decrease value;
�Select the next item.
EUniversal button.
The function depends on the current text on the
display.

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EN - 9
2.4.1 Overview of the basic main screen
The basic mode provides access to general settings and information.
The symbol is displayed in the left top corner of the menus when the basic mode is active.
Position Part
ACurrent function of the universal button
below it.
BCurrent function of the universal button
below it.
CCurrent day and time.
DCurrent operating function.
ERemaining time of current operating
function.
FCurrent sensor mode:
�SENSOR = sensor is overruling the
current set airflow;
�sensor = sensor can overrule the
current set airflow;
�no text = sensor can not overrule the
current set airflow.
GCurrent ventilation mode:
�AUTO = the airflow is set by the
scheduler;
�MANUAL = the airflow is set by the user.
HTemporary override of the SCHEDULER
VENTILATION.
ICurrent fan mode:
�no icon = both fans are in operation
(BALANCE);
�= extract fan is not in operation
(S UPPLY ONLY );
�= supply fan is not in operation
( E X TR AC T O NLY );
�= both fans are not in operation
(SERVICE MODE).
Position Part
JCurrent warning or error message:
�= Warning;
�= Error.
KComfoCool Q600 is in operation.
LCurrent set temperature profile:
�no icon = NORMAL.
�= WARM;
�= COOL.
MChild lock is in operation.
NCurrent set airflow:
�= PRESET A (Away)
�= PRESET 1 (Low)
�= PRESET 2 (Middle)
�= PRESET 3 (High)
SHIFT
MENU
AUTO
sensor
Mo 14:02
supply only min50
SERVICE MODE
J
ML
I
H
K
N
A
G
F
E
D
C
B

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2.4.2 Overview of the advanced main screen
The advanced mode provides access to more detailed information on the settings.
All information from the basic mode is also accessible in the advanced mode.
The symbol is displayed in the left top corner of the menus when the advanced mode is active.
SHIFTMENU
200m
3
/h
AUTO
sensor
Mo 14:02
BYPASS OPEN min50
SERVICE MODE
18.020.0
A
C
B
E
D
Position Part
ACurrent airflow volume in m3/h or l/s.
BCurrent supply fan mode:
�no icon = fan is not in operation;
�= fan is in operation.
CCurrent outdoor air temperature in °C or °F.
(Only visible when the supply fan is active)
DCurrent supply air temperature °C or °F.
(Only visible when the supply fan is active)
ECurrent extract fan mode:
�no icon = fan is not in operation;
�= fan is in operation.
2.4.3 Overview of the visual signals of the LED
Status Function
On The unit is operating correctly.
Off The display is in use or there is no power.
Flashing slowly, every second. Warning:
�Change filters;
�SERVICE MODE.
Flashing rapidly, four times a second. Error.

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EN - 11
3 Operation
Read the manual of the connected operating devices
to see how to use them.
Read this document to see how to use the display on
the unit
3.1 How to use the display on the unit
The main screen will start automatically when
you open the visor. In case of an error or warning
messages the display will also start when the visor
is closed. The display will always stop automatically
after 15 minutes of no activity. Press any key to
restart the display.
3.1.1Start/stop child lock
Select and hold MENU in the main screen for 4
seconds.
3.1.2 Switch between user modes
When in basic mode:
1. Select SHIFT in the main screen.
2. Select ADVANCED.
When in advanced mode:
1. Select SHIFT in the main screen.
2. Select BASIC.
3.1.3 How to navigate through the menu
1. Select MENU to get access to the menus.
2. Use the up and down button to navigate forward
and back through the menus.
3. When the selection arrow is in front of the desired
option select CONFIRM.
When you are done with all your operating options:
1. Select BACK until you reach the main screen.
2. Close the visor.
3.1.4 Manually set the airflow
To set a temporary airflow press the up or down
button to select the desired temporary airflow.
When the next step of the SCHEDULER
VENTILATION starts or after a maximum of two
hours the unit will automatically switch back to AUTO
mode.
To set a permanent airflow:
1. Navigate to TASK MENU.
2. Navigate to AUTO/MANUAL.
3. Navigate to MANUAL.
4. Select the desired airflow with the up and down
button.
5. Select CONFIRM.
6. Select CONFIRM.
Stop the MANUAL mode:
1. Repeat step 1 and 2.
2. Navigate to AUTO.
3.1.5 Set the airflow to a maximum (BOOST) for a
specific duration
1. Navigate to TASK MENU.
2. Navigate to BOOST.
3. Navigate to TIMER.
4. Select the desired duration with the up and down
button.
5. Select CONFIRM.
Stop the boost before the end of the duration:
1. Repeat step 1 and 2.
2. Navigate to OFF.
3.1.6 Stop the airflow for a specific duration
1. Navigate to TASK MENU.
2. Navigate to VENTILATION.
3. Navigate to
- SUPPLY ONLY if you would like to stop
extracting air;
- EXTRACT ONLY if you would like to stop
supplying air (if available);
4. Select the desired duration with the up and down
button.
5. Select CONFIRM.
6. Select CONFIRM.
Start the airflow before the end of the duration:
1. Repeat step 1 and 2.
2. Navigate to BALANCE.
3.1.7 Set the airflow to a minimum for the period of
your absence (PRESET A)
1. Navigate to TASK MENU.
2. Navigate to AWAY.
3. Navigate to UNTIL.
4. Set your expected return time with the up and
down button.
5. Select CONFIRM after each set number.
Stop the away mode before the end of the time:
1. Repeat step 1 and 2.
2. Navigate to OFF.
3.1.8 Set the temperature profile
1. Navigate to TASK MENU.
2. Navigate to TEMPERATURE PROFILE.
3. Navigate to the desired temperature profile.

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3.1.9 Set a schedule
Programming rules:
�When programs overlap, the shortest program
is the leading program and overrule any longer
program;
�In some cases the setting of the airflow may be
increased by an automated software setting e.g.
the settings of the SENSOR VENTILATION2.
1. Navigate to TASK MENU.
2. Navigate to SCHEDULER.
3. Navigate to
- VENTILATION if you would like to set a schedule
for the airflow;
- COMFOCOOL3if you would like to set a
schedule for the ComfoCool Q600.
4. Select
- VIEW/EDIT to view/change a scheduler step;
- DELETE to remove a scheduler step.
5. Select
- NEW to create a new schedule step;
- STEP to change or view the selected schedule
step.
6. Navigate to the desired period.
7. Select your desired start time with the up and
down button.
8. Select CONFIRM after each number.
9. Select your desired end time with the up and
down button.
10. Select CONFIRM after each number.
11. Select/navigate to your desired setting.
3.1.10 Manually set the heat recovery control (bypass)
for a specific duration
1. Navigate to TASK MENU.
2. Navigate to BYPASS.
3. Navigate to
- OPEN if you would like to minimise the heat
recovery control (outdoor air is supplied directly
into the dwelling);
- DISABLE if you would like to maximise the heat
recovery control.
4. Select the desired duration with the up and down
button.
5. Select CONFIRM.
Start the automatic heat recovery control before the
end of the duration:
1. Repeat step 1 and 2.
2. Navigate to AUTO.
3. Select CONFIRM.
4. Select BACK.
5. Select BACK.
3.1.11 Stop the ComfoCool Q600 for a specific
duration
1. Navigate to TASK MENU.
2. Navigate to COMFOCOOL3.
3. Navigate to OFF.
4. Select the desired duration with the up and down
button.
5. Select CONFIRM.
Start the ComfoCool Q600 before the end of the
duration:
1. Repeat step 1 and 2.
2. Navigate to AUTO.
3This menu is only visible when the accessory is connected to the unit.

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EN - 13
3.2 Menu structure
MENU
RESET ERROR1
AUTO/MANUAL
CURRENT ERRORS
STATUS (read only)
FILTERS
BOOST
UNIT
BASIC OPTIONS
VENTILATION
SCHEDULER
RESET ALL TASKS
AWAY
TEMP. AND HUMIDITY
SENSOR VENTILATION2
ADVANCED SETTINGS2
BYPASS STATE
TEMPERATURE PROFILE2
TEMPERATURE PROFILE
FROST UNBALANCE
UNITS2
SCHEDULER
FROST PREHEATER3
SEASON DETECTION2
BYPASS
POSTHEATER3
RF SETTINGS2,7
COMFOCOOL3
ANALOG INPUT3
SUBSOIL HEAT EXCH.3
COMFOCOOL3
SEASON DETECTION
FANS
ENERGY
INSTALLER DEFAULT2
TASK MENU
1This menu is only visible when errors occur.
2This menu is only visible when the advanced mode is active.
3This menu is only visible when the accessory is connected to the unit.
7This menu is only visible when the unit has RF functionality.

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3. 2.1 RESET ERROR1
Menu item Function
RESET ERROR1To let the unit automatically solve errors.
3.2.2 TASK MENU
Menu item Function
AUTO/MANUAL
To set the airflow.
�AUTO: the unit will change settings automatically according to the programed SCHEDULER(s); (default
setting)
�MANUAL: the unit will set the airflow according to the input of the user (A/1/2/3).
In some cases the setting of the airflow may be increased by an automated software setting e.g. the
settings of the SENSOR VENTILATION2.
BOOST
To start the airflow PRESET 3 for a specific duration.
�TIMER: the unit will set the airflow to PRESET 3 for the set duration;
�OFF: the unit will return to the normal airflow. (default setting)
VENTILATION
To stop the airflow for a specific duration.
�BALANCE: the unit will start both supply and extract fan; (default setting)
�SUPPLY ONLY: the unit will stop the extract fan for the set duration;
�EXTRACT ONLY: the unit will stop the supply fan for the set duration (if available).
AWAY
To set the airflow to a minimum flow rate for a specific duration.
�UNTIL: the unit will set the airflow to PRESET A for the set duration;
�OFF: the unit will return to the normal airflow. (default setting)
TEMPERATURE PROFILE
To set the amount of heat recovery control automatically.
�WARM: set if you prefer generally higher room temperature;
�NORMAL: set if you prefer average room temperature; (default setting)
�COOL: set if you prefer generally lower room temperature.
The effect of the set temperature profile on the indoor climate is mainly noticeable in the shoulder seasons
(autumn and spring) and limited by nature.
It will be more pronounced and less season-dependent in case the installation is equipped with one or
more of the options that follow:
�active cooling (e.g. ComfoCool Q600);
�heating devices (e.g. pre-heater and/or post-heater);
�a regulated subsoil heat exchanger (e.g. ComfoFond-L Q).
SCHEDULER To set the settings automatically based on the set schedule.
(This function is stopped in the permanent MANUAL mode)
VENTILATION
(Default: PRESET 2)
�VIEW/EDIT: view or set the schedule of the airflow.
- NEW: create a new step within the schedule (period, start time, end time, airflow);
- STEP: view or edit the selected step of the schedule.
�DELETE: delete the set schedule of the airflow
- STEP: delete the selected step of the schedule;
- ALL: delete all the steps of the schedule.
COMFOCOOL3
(Default: AUTO)
�VIEW/EDIT: view or set the schedule of the ComfoCool Q600.
- NEW: create a new step within the schedule (period, start time, end time, ComfoCool Q600 mode);
- STEP: view or edit the selected step of the schedule.
�DELETE: delete the set schedule of the ComfoCool Q600
- STEP: delete the selected step of the schedule;
- ALL: delete all the steps of the schedule.
BYPASS
To set the heat recovery control of the bypass functionality for a specific duration.
�AUTO: the unit will control the heat recovery control automatically; (default setting)
�DISABLE: the unit will increase the heat recovery control to a maximum;
�OPEN: the unit will decrease the heat recovery control to a minimum (if possible outdoor air is supplied
directly into the dwelling).
COMFOCOOL3
To stop the ComfoCool Q600 for a specific duration.
�AUTO: the unit will control the ComfoCool Q600 automatically; (default setting)
�OFF: the unit will stop de ComfoCool Q600 for the set duration;
1This menu is only visible when errors occur.
2This menu is only visible when the advanced mode is active.
3This menu is only visible when the accessory is connected to the unit.

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EN - 15
3.2.3 STATUS (read only)
Menu item Function
CURRENT ERRORS To view the codes of the current errors.
UNIT
To view the information about the unit.
�HRU TYPE: view the type name of the unit;
�FIRMWARE VERSION: view the firmware version of the unit;
�SERIAL NUMBER: view the serial number of the main board in the unit.
SCHEDULER
To view the scheduler step in which the unit is currently running.
�VENTILATION: view which step of the ventilation scheduler is in operation;
�COMFOCOOL3: view which step of the ComfoCool Q600 scheduler is in operation.
TEMP. AND HUMIDITY
To view the current temperature and humidity of the airflows.
�EXTRACT AIR TEMP.: view the current temperature of the extract airflow;
�EXTRACT AIR HUM.: view the current humidity level of the extract airflow;
�EXHAUST AIR TEMP.: view the current temperature of the exhaust airflow;
�EXHAUST AIR HUM.: view the current humidity level of the exhaust airflow;
�OUTDOOR AIR TEMP.: view the current temperature of the outdoor airflow;
�OUTDOOR AIR HUM.: view the current humidity level of the outdoor airflow;
�SUPPLY AIR TEMP.: view the current temperature of the supply airflow;
�SUPPLY AIR HUM.: view the current humidity level of the supply airflow.
BYPASS STATE To view the current state of the heat recovery control (bypass).
�The percentage of bypassed air is shown.
FROST UNBALANCE To view the current state of airflow unbalance caused by the frost protection function.
�The percentage of supply air reduction is shown.
FROST PREHEATER3To view the current state of the preheater caused by the frost protection function.
�The current power of the preheater is shown.
POSTHEATER3To view the current state of the post-heater.
�The percentage of the post-heater control is shown.
ANALOG INPUT3
To view the current state of the analog input(s)
�0-10V 13: view the voltage level of the first analog input.
�0-10V 23: view the voltage level of the second analog input.
�0-10V 33: view the voltage level of the third analog input.
�0-10V 43: view the voltage level of the fourth analog input.
SUBSOIL HEAT EXCH.3
To view the current state of the regulated subsoil heat exchanger (e.g. ComfoFond-L Q).
�STATE: view the current state of the regulated subsoil heat exchanger pump;
�OUTDOOR AIR TEMP.: view the current outdoor air temperature;
�GROUND TEMPERATURE: view the current temperature of the regulated subsoil heat exchanger
brine liquid.
COMFOCOOL3
To view the current state of the ComfoCool Q600.
�STATE: view the current ComfoCool Q600 mode and the current ComfoCool Q600 supply air
temperature;
�CONDENSER TEMP: view the current condenser temperature.
SEASON DETECTION
To view the current season detection state.
�SEASON: view the current season mode;
�LIMIT RMOT HEAT: view the set RMOT4below which the (central) heating system is normally active;
�LIMIT RMOT COOL: view the set RMOT4above which the (central) cooling system is normally
active;
�CURRENT RMOT: view the current RMOT4.
FANS To view the current state of the fans
SUPPLY FAN
�FAN SPEED: view the current speed of the fan.
�FAN DUTY: view the current duty of the fan.
�FLOW: view the current airflow of the fan.
EXTRACT FAN
�FAN SPEED: view the current speed of the fan.
�FAN DUTY: view the current duty of the fan.
�FLOW: view the current airflow of the fan.
ENERGY To view the energy consumption and saved energy.
POWER CONSUMPTION
�VENTILATION: view the current electrical consumption of the fans.
�PREHEATER: view the current electrical consumption of the preheater.
�YEAR TO DATE: view the energy consumption of the fans since the beginning of the year.
�TOTAL: view the total energy consumption of the fans since the moment of commissioning.
AVOIDED HEATING
�ACTUAL POWER: view the current avoided heating power.
�YEAR TO DATE: view the avoided heating energy since the beginning of the year.
�TOTAL: view the avoided heating energy since the moment of commissioning.
AVOIDED COOLING
�ACTUAL POWER: view the current avoided cooling power.
�YEAR TO DATE: view the avoided cooling energy since the beginning of the year.
�TOTAL: view the avoided cooling energy since the moment of commissioning. .
TOTAL SAVINGS �YEAR TO DATE: to view the total energy savings since the beginning of the year.
�TOTAL: to view the total energy savings since the moment of commissioning.
3This menu is only visible when the accessory is connected to the unit.
4RMOT = running mean outdoor temperature (average temperature over past five days).

16 - EN
3.2.4 FILTERS
Menu item Function
FILTER STATUS To view within how many days the filters need to be changed.
CHANGE FILTERS To change the filters, follow the instructions on the display.
3.2.5 BASIC OPTIONS
Menu item Function
CLOCK To set the actual date and time.
LANGUAGE To set the language on the display. (Default: English)
BRIGHTNESS To set the level of brightness on the display.
3.2.6 RESET ALL TASKS
Menu item Function
RESET EXCL SCHEDULE To reset all the tasks, excluding the set scheduler(s).
RESET INCL SCHEDULE To reset all the tasks, including the set scheduler(s).
3.2.7 ADVANCED SETTINGS2
Menu item Function
SENSOR VENTILATION2To set the airflow automatically according to the built-in sensors of the unit. (demand control)
TEMPERATURE PASSIVE2
Increase the airflow automatically to maximise passive cooling or heating under favourable conditions.
(bypass)
�ON: the unit will increase the airflow in the AUTO mode and MANUAL mode if requested by the
built-in sensors;
�AUTO ONLY: the unit will only increase the airflow in the AUTO mode if requested by the built-in
sensors;
�OFF: the unit will ignore the request to increase the airflow by the built-in sensors. (default setting)
TEMPERATURE ACTIVE2
Increase the airflow automatically to maximise active cooling or heating under favourable conditions.
(ComfoCool Q600 / pre-heater / post-heater)
�ON: the unit will increase the airflow in the AUTO mode and MANUAL mode if requested by the
built-in sensors;
�AUTO ONLY: the unit will only increase the airflow in the AUTO mode if requested by the built-in
sensors;
�OFF: the unit will ignore the request to increase the airflow by the built-in sensors. (default setting)
HUMIDITY COMFORT2
Increase the airflow automatically to maintain a comfortable humidity level under favourable
conditions. (By maximizing passive humidification or dehumidification)
�ON: the unit will increase the airflow in the AUTO mode and MANUAL mode if requested by the
built-in sensors;
�AUTO ONLY: the unit will only increase the airflow in the AUTO mode if requested by the built-in
sensors; (default setting)
�OFF: the unit will ignore the request to increase the airflow by the built-in sensors.
HUMIDITY PROTECTION2
Increase the airflow automatically to avoid moisture problems.
�ON: the unit will increase the airflow in the AUTO mode and MANUAL mode if requested by the
built-in sensors; (default setting)
�AUTO ONLY: the unit will only increase the airflow in the AUTO mode if requested by the built-in
sensors;
�OFF: the unit will ignore the request to increase the airflow by the built-in sensors.
The airflow will be increased if the outdoor humidity level is lower than the indoor humidity level and
the relative humidity of the indoor air exceeds a level above which moisture problems can occur.
2This menu is only visible when the advanced mode is active.

16 - EN
EN - 17
Menu item Function
TEMPERATURE PROFILE2To set the settings of the temperature profile.
SET MODE2
�ADAPTIVE: The desired indoor temperature to which the unit will adjust the heat recovery control
varies with the outdoor climate (adaptive comfort technology). The set temperature can be
increased or decreased with 1,5°C from the average setting by selecting the WARM or COOL
temperature profile; (default setting)
�FIXED: The desired indoor temperature to which the unit will adjust the heat recovery control is
fixed and does not depend on the outdoor climate. The set temperatures can be changed in FIXED
PRESETS for each temperature profile.
FIXED PRESETS2
�WARM: set the temperature for the temperature profile mode WARM in FIXED mode; (Default = 24°C
or 76°F)
�NORMAL: set the temperature for the temperature profile mode NORMAL in FIXED mode; (Default =
20°C or 68°F)
�COOL: set the temperature for the temperature profile mode COOL in FIXED mode. (Default = 18°C
or 64°F)
UNITS2To change the displayed units of the temperature and airflow rate.
TEMPERATURE2�CELSIUS: the unit will display the temperature in degrees Celsius; (default setting)
�FAHRENHEIT: the unit will display the temperature in degrees Fahrenheit.
FLOW2�m³/h: the unit will display the airflow rate in cubic meters per hour;
�l/s: the unit will display the airflow rate in liters per second. (default setting)
SEASON DETECTION2To set the season detection for heat recovery control.
HEATING SEASON2
Prevent the unit from counteracting the effect of the (central) heating system.
�HEATING LIMIT RMOT4: set the heating-limit5RMOT4(Default: 11°C);
�STARTS NOW: start the heating season and save the current RMOT4as the heating-limit5.
COOLING SEASON2
Prevent the unit from counteracting the effect of the (central) cooling system.
�COOLING LIMIT RMOT4: set the cooling-limit6RMOT4(Default: 20°C);
�STARTS NOW: start the cooling season and save the current RMOT4as the cooling-limit6.
RF SETTINGS2,7 To set the settings of the RF sensor(s).
RF SENSOR PRIORITY2,7 �ON: the unit will translate the signal from an RF sensor to an airflow signal in the AUTO mode and
MANUAL mode; (default setting)
�AUTO ONLY: the unit will only translate the signal from an RF sensor to an airflow signal in the AUTO
mode;
�OFF: the unit will ignore the signal from an RF sensor.
RF SENSOR FUNCTION2,7 �FLOW PROPORTIONAL: the unit will translate the signal from an RF sensor to a corresponding
airflow between the minimal and maximal set airflow. (default setting)
�FLOW PRESET: the unit will translate the signal from an RF sensor to one of the preset airflows.
INSTALLER DEFAULT2�RESET: All software values mentioned in this document will be returned to the default settings.
2This menu is only visible when the advanced mode is active.
4RMOT = running mean outdoor temperature (average temperature over past 5 days).
5heating-limit = the temperature below which the (central) heating system is normally active.
6cooling-limit = the temperature above which the (central) cooling system is normally active.
7This menu is only visible when the unit has RF functionality.
3.3 Use during disasters
If a disaster calls for you to close all doors and
windows you must also stop the unit. You can do this
in one of the following ways:
�Switch off the power supply of the outlet to which
the unit is connected;
�Switch off the power supply group at the fuse box
to which the unit is connected;
�Pull out the power supply cable from the outlet to
which the unit is connected.

18 - EN
4 Certification and warranty
Warranty conditions
The unit is covered by a manufacturer’s warranty for
a period of 24 months after fitting up to a maximum
of 30 months after the date of manufacture. Warranty
claims may only be submitted for material faults
and/ or construction faults arising during the
warranty period. In the case of a warranty claim,
the unit must not be dismantled without written
permission from the manufacturer. Spare parts are
only covered by the warranty if they were supplied
by the manufacturer and have been installed by an
approved installer.
The warranty becomes invalid if:
�The guarantee period has elapsed;
�The unit is used without filters;
�Parts are used that have not been supplied by the
manufacturer;
�Non-authorised changes or modifications have
been made to the unit;
�Installation has not been carried out according to
the applicable regulations;
�The defects are due to incorrect connection,
inexpert use, or contamination of the system.
On-site (dis)assembly costs are not covered by the
terms of the warranty. This also applies to normal
wear and tear. Zehnder retains the right to change
the construction and/or configuration of its products
at any time without being obliged to alter previously
delivered products.
Liability
The unit has been designed and manufactured for
use in balanced ventilation systems incorporating
Zehnder heat recovery systems. Any other
application is seen as inappropriate use and can
result in damage to the unit or personal injury, for
which the manufacturer cannot be held liable. The
manufacturer is not liable for any damage originating
from:
�Non-compliance with the safety, operating and
maintenance instructions in this document;
�The use of components not supplied or
recommended by the manufacturer.
Responsibility for the use of such components lies
entirely with the installer;
�Normal wear and tear.
Disposal
Dispose of the unit in an environmentally friendly
manner. Do not dispose of the unit with your
domestic waste.
1. Contact the supplier about the possibilities to
return the unit.
2. If the unit cannot be returned, check the local
regulations for the options on recycling the
components.
3. Do not dispose of the batteries from the wireless
(RF) operating devices as normal waste. They
must be discarded at designated disposal
locations.
CE certification
Zehnder Group Nederland B.V.
Lingenstraat 2 • 8 028 PM Zwolle-NL
T [phone] • F + 31 (0)38 4225694
Company register Zwolle 05022293
EEC declaration of conformity
Machine description Heat recovery units: ComfoAir Q series
Complies with the following directives Machinery Directive (2006/42/EEC)
Low Voltage Directive (2006/95/EEC)
EMC Directive (2004/108/EEC)
Zwolle, 04-04-2016
Zehnder Group Nederland B.V.
A.C. Veldhuijzen,
Head of R&D
Competence Center ComfoSystems

18 - EN
EN - 19
Information requirement for RVUs as per EU Regulation No. 1253/2014
Heat Recovery Unit Zehnder ComfoAir Q 350 ST
Supplier name or trade
mark Zehnder group Zehnder group Zehnder group Zehnder group
Supplier’s model
identifier ComfoAir Q 350 ST ComfoAir Q 350 ST ComfoAir Q 350 ST ComfoAir Q 350 ST
SEC in [kWh/(m²a)] for
each climate zone
(cold, average, warm)
-80.0 -40.4 -15.0 -80.7 -40.9 -15.5 -82.3 -42.4 -16.9 -85.0 -44.7 -19.0
SEC Class A+ A E A+ A E A+ A+ EA+ A+ E
Type of ventilation unit Bidirectional RVU Bidirectional RVU Bidirectional RVU Bidirectional RVU
Type of drive installed Multi-speed drive Multi-speed drive Variable speed drive Variable speed drive
Type of heat system1Recuperative Recuperative Recuperative Recuperative
Thermal efficiency294% 94% 94% 94%
Maximum flow rate
[m³/h]3350 350 350 350
Electric power input
[W]4175 175 175 175
Sound power level
(LWA) in [dB(A)] 540 40 40 40
Reference flow rate in
[m³/h]6245 245 245 245
Reference pressure
difference [Pa] 50 50 50 50
SPI in [W/(m³/h)]70.20 0.20 0.20 0.20
Control factor and
typology
1
Manual control
0.95
Clock-controlled
0.85
Central demand control
0.65
Local demand control
Declared maximum
internal and external
leakage rates (%)8
Internal: 0.8%
External: 1.2%
Internal: 0.8%
External: 1.2%
Internal: 0.8%
External: 1.2%
Internal: 0.8%
External: 1.2%
Mixing rate9----
Position and
description of visual
filter warning
Warning on the display of
the unit or room controller
Warning on the display of
the unit or room controller
Warning on the display of
the unit or room controller
Warning on the display of
the unit or room controller
Internet address
for assembly
and disassembly
instructions
www.zehnder.co.uk www.zehnder.co.uk www.zehnder.co.uk www.zehnder.co.uk
Airflow sensitivity to
pressure variations
[%]10
----
Indoor/outdoor air
tightness [m³/h]11 ----
AEC (in kWh
electricity/a) for each
climate zone
(cold, average, warm)
21.1 6.7 6.3 11.6 6.2 5.8 10.3 5.0 4.5 8.5 3.1 2.6
AHS (in kWh primary
energy/a) for each
climate zone
(cold, average, warm)
92.1 47.1 21.3 92.3 47. 2 21.3 92.7 47.4 21.4 93.4 47.8 21.6
1: Type of heat recovery: „recuperative“ heat recovery is heat recovery without moving parts (plate heat exchanger).
2: Thermal efficiency: as per EN 13141-7:2010 at a reference flow rate of 50 Pa; as per EN 13141-8:2014 for non-ducted units.
3: Maximum flow rate at 100 Pa of external static pressure difference.
4: Electric power input at maximum flow rate.
5: Noise emitted from housing at reference flow rate.
6: Reference flow rate (70% of the maximum flow rate at 50 Pa of external static pressure difference as per EN 13141-7:2010).
7: As per EN 13141-7:2010 at reference flow rate.
8: As per EN 13141-7:2010; as per EN 13141-8:2014 for non-ducted units.
9: As per EN 13141-8:2014 for non-ducted units.
10: As per EN 13141-8:2014 for non-ducted units: airflow sensitivity to pressure variations at +20 Pa and -20 Pa.
11: As per EN 13141-8:2014 for non-ducted units.
SEC: Specific energy consumption.
SPI: Specific power input.
AEC: Annual electricity consumption.
AHS: Annual heating saved .

20 - EN
Information requirement for RVUs as per EU Regulation No. 1253/2014
Heat Recovery Unit Zehnder ComfoAir Q 350 ST Enthalpy
Supplier name or trade
mark Zehnder group Zehnder group Zehnder group Zehnder group
Supplier’s model
identifier
ComfoAir Q 350 ST
Enthalpy
ComfoAir Q 350 ST
Enthalpy
ComfoAir Q 350 ST
Enthalpy
ComfoAir Q 350 ST
Enthalpy
SEC in [kWh/(m²a)] for
each climate zone
(cold, average, warm)
-73.2 -36.9 -13.4 -74.2 -37. 6 -14.0 -76.5 -39.4 -15.6 -80.5 -42.4 -17.9
SEC Class A+ A E A+ A E A+ A E A+ A+ E
Type of ventilation unit Bidirectional RVU Bidirectional RVU Bidirectional RVU Bidirectional RVU
Type of drive installed Multi-speed drive Multi-speed drive Variable speed drive Variable speed drive
Type of heat system1Recuperative Recuperative Recuperative Recuperative
Thermal efficiency283% 83% 83% 83%
Maximum flow rate
[m³/h]3350 350 350 350
Electric power input
[W]4175 175 175 175
Sound power level
(LWA) in [dB(A)] 540 40 40 40
Reference flow rate in
[m³/h]6245 245 245 245
Reference pressure
difference [Pa] 50 50 50 50
SPI in [W/(m³/h)]70.20 0.20 0.20 0.20
Control factor and
typology
1
Manual control
0.95
Clock-controlled
0.85
Central demand control
0.65
Local demand control
Declared maximum
internal and external
leakage rates (%)8
Internal: 1.8%
External: 1.2%
Internal: 1.8%
External: 1.2%
Internal: 1.8%
External: 1.2%
Internal: 1.8%
External: 1.2%
Mixing rate9----
Position and
description of visual
filter warning
Warning on the display of
the unit or room controller
Warning on the display of
the unit or room controller
Warning on the display of
the unit or room controller
Warning on the display of
the unit or room controller
Internet address
for assembly
and disassembly
instructions
www.zehnder.co.uk www.zehnder.co.uk www.zehnder.co.uk www.zehnder.co.uk
Airflow sensitivity to
pressure variations
[%]10
----
Indoor/outdoor air
tightness [m³/h]11 ----
AEC (in kWh
electricity/a) for each
climate zone
(cold, average, warm)
12.1 6.7 6.3 11.6 6.2 5.8 10.3 5.0 4.5 8.5 3.1 2.6
AHS (in kWh primary
energy/a) for each
climate zone
(cold, average, warm)
85.3 43.6 19.7 85.8 43.9 19.8 86.9 44.4 2 0.1 89.0 45.5 20.6
1: Type of heat recovery: „recuperative“ heat recovery is heat recovery without moving parts (plate heat exchanger).
2: Thermal efficiency: as per EN 13141-7:2010 at a reference flow rate of 50 Pa; as per EN 13141-8:2014 for non-ducted units.
3: Maximum flow rate at 100 Pa of external static pressure difference.
4: Electric power input at maximum flow rate.
5: Noise emitted from housing at reference flow rate.
6: Reference flow rate (70% of the maximum flow rate at 50 Pa of external static pressure difference as per EN 13141-7:2010).
7: As per EN 13141-7:2010 at reference flow rate.
8: As per EN 13141-7:2010; as per EN 13141-8:2014 for non-ducted units.
9: As per EN 13141-8:2014 for non-ducted units.
10: As per EN 13141-8:2014 for non-ducted units: airflow sensitivity to pressure variations at +20 Pa and -20 Pa.
11: As per EN 13141-8:2014 for non-ducted units.
SEC: Specific energy consumption.
SPI: Specific power input.
AEC: Annual electricity consumption.
AHS: Annual heating saved .