Zehnder Rittling ComfoAir E 350 User guide

Cooling Ventilation FilteringHeating
ComfoAir E350
Manual for the installer

2 - EN
Foreword
Please read this manual carefully before operating
the unit.
With the help of this manual, you can install, commission
or carry out maintenance on the ComfoAir E in a safe
and optimal manner. The ComfoAir E is hereinafter
referred to as the “unit”. As the unit is subject to
continuous development and improvement, your unit
may differ slightly from the descriptions in this manual.
The following symbols are used in this manual:
Symbol Meaning
Point of attention.
Risk of compromised performance or
damage of the ventilation system.
Risk of personal injury.
CHANGED
SAME
Questions
Contact the importer if you have any questions or wish
to order a new manual or new filters. Contact details:
Information given in the Instructions for the user.
General information about the ventilation system.
Warranty and liability conditions
EC declaration of conformity.
Replacing filters in the unit.
Cleaning the valves and/or grilles in the ventilation system.
Use of the display on the unit.
Information given in the Manual for the service engineer.
Maintenance procedures.
Malfunction procedures.
Available service parts.
Extensive technical data.
All rights reserved.
This manual has been compiled 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.
Zehnder Group Sales International • Zehnder Group Deutschland GmbH
Almweg 34 · 77933 Lahr · Germany
T [phone] •· F [phone]
[e-mail] • www.international.zehnder-systems.com

EN - 3
Contents
Foreword .....................................................................................................................................................................................2
1 Safety instructions ........................................................................................................................................................................4
2 Installation conditions ....................................................................................................................................................................4
3 Transport and unpacking...............................................................................................................................................................5
4 Technical specifications.................................................................................................................................................................6
4.1 Configuration of the unit ........................................................................................................................................................7
4.2 Connection diagram .............................................................................................................................................................8
4.3 Dimension sketch ...............................................................................................................................................................10
5 Installation procedures ................................................................................................................................................................11
5.1 Wall mounting.....................................................................................................................................................................11
5.2 Floor mounting ...................................................................................................................................................................12
5.3 Installation of the condensation drain ...................................................................................................................................12
5.4 Installation of the air ducts ...................................................................................................................................................13
6 Commissioning procedures ........................................................................................................................................................14
6.1 Overview of the display .......................................................................................................................................................14
6.2 Service menu .....................................................................................................................................................................15
6.3 Programming air specifications ............................................................................................................................................16
6.4 RF controls.........................................................................................................................................................................17
6.5 Explanation of VENTILATION SETTINGS menu .....................................................................................................................18
6.6 Explanation of REPLACE FILTER warning .............................................................................................................................18
6.7 Explanation of ALTITUDE menu............................................................................................................................................18
6.8 Explanation of TEMPERATURE menu ..................................................................................................................................18
6.9 Explanation of FANS menu..................................................................................................................................................18
6.10 Explanation of UNIT SPECIFICATION menu .........................................................................................................................19
6.11 Explanation of the BALANCE SETTING menu.......................................................................................................................19
6.12 Explanation of ANALOGUE 0-10 V menu (standard) and RF SETTING (optional) ....................................................................19
6.13 Explanation of the PREHEATER menu .................................................................................................................................19
6.14 Explanation of the SYSTEM TEST menu ..............................................................................................................................20
6.15 Explanation of RESTORE TO FACTORY SETTINGS menu ....................................................................................................20
6.16 Explanation of control methods............................................................................................................................................20
7 Available accessories..................................................................................................................................................................21
8 Available controls........................................................................................................................................................................22
9 Quick installation guide ...............................................................................................................................................................23

4 - EN
1 Safety instructions
■Always comply with the safety regulations
in this document. Failure to comply with the
safety regulations, instructions, warnings
and comments may lead to personal injury
or damage to the unit.
■Always observe the local building,
safety and installation guidelines of the
municipality, utility companies or other
authorities;
■Always connect air ducts with a minimum
length of 900 mm to the unit before
connecting the power supply to prevent
contact with the rotating fans.
■After installation, all parts that could lead
to personal injury are safely out of reach
behind the casing. The ComfoAir cannot be
opened without using tools.
■It is not permitted to modify the unit or
any of the specifications contained in this
document. This may result in personal injury
or reduced ventilation system performance.
■Installation, commissioning and
maintenance must be carried out by a
certified person or company, unless stated
otherwise. If this work is carried out by
unauthorised persons, it may result in
personal injury or reduced performance of
the ventilation system.
■Always unplug the power cord before
starting any work on the unit. Using the
unit with the casing open may result in
personal injury. In this case, make sure
that no conductive or rotating parts can be
touched.
■Static charge can damage the electronics.
When working with electronics, always take
protective measures to prevent electrostatic
discharge, such as wearing an antistatic
wristband.
■If the power cord is damaged, it must be
replaced by the manufacturer, the service
engineer or a qualified person to avoid
risks.
2 Installation conditions
■Connect the unit to a 230 V~ 50 Hz power supply.
Any other mains connection will damage the unit;
■The unit is designed for use in residential areas only.
The unit is not suitable for commercial use, e.g. in
swimming pools or saunas. Installation in an industrial
environment can damage the unit;
■Check whether the installation area will remain within
the permissible temperature range throughout the
year.
The permissible temperature of the installation area is
given in the section “Technical specifications”;
■Zehnder recommends that the unit is not installed in
spaces with higher-than-average humidity (such as
a bathroom or toilet). This prevents the formation of
condensation on the outside of the unit.
■Check whether the electrical installation can
cope with the maximum capacity of the unit. The
maximum capacity is given in the section “Technical
specifications”.
■Check whether the installation area of the unit has
sufficient room for the following aspects:
- The air duct system including dampening material
around the unit;
- Carrying out maintenance activities in front of the
unit (at least 1 m);
- The condensation drain below the unit;
- Wiring additional options (optional);
- The power connection of the unit.

4 - EN EN - 5
3 Transport and unpacking
The permissible storage and transport
temperature
is -20°C to +50°C.
Treat the unit with care during transport
and unpacking. Make sure the packing material is
disposed of in an environmentally friendly manner.
Checking the delivery
Contact your supplier immediately in case of damage
or an incomplete delivery. The delivery should at least
include:
■The unit: check the identification plate to ensure that
you have received the correct unit type.
■Mounting bracket;
■Documentation;
■Connector set;
■Protective cover;
■Condensation drain adapter 32 mm pipe;
■Condensation drain sealing cap.
Information available on the identification plate
Extension Meaning
ComfoAir E Product family name
350 Maximum airflow: 350 m3/h.
R The dwelling side is installed at the factory as
standard on the right-hand side of the unit.
L The dwelling side is installed at the factory as
standard on the left-hand side of the unit.
VL/VR The unit is supplied by the factory with a preheater
Check the unit type carefully. The location of the air
ducts cannot be changed in the field.

6 - EN
4 Technical specifications
ComfoAir E350
Performance
Minimum airflow if preheater on 100 m3/h
Minimum airflow if preheater off 50 m3/h
Maximum airflow 350 m3/h
Heat efficiency level191%
Electrical connection details
Maximum performance/power without preheater2120 W 1.03 A
Maximum performance/power with preheater21580 W 7.38 A
Power supply 230 V ± 10%, single phase, 50 Hz
Cos φ0.34 - 0.51
Mechanical connection details
Dimensions of air connection (Ø) Internal: 160 mm
External: 190 mm
Dimensions of condensation drain (Ø) 32 mm
Material specifications
Casing Coated sheet steel
Inner surface EPP and ABS
Heat exchanger Polystyrene
General
Temperature range during transport and storage -20°C to +50°C
Temperature range moved air -15°C to +50°C
Temperature range of installation area >8°C (is not a range)
Relative humidity of installation area <90% (non-condensing)
IP classification IP 41
ISO classification B
Weight 50 kg
Filter class ISO Coarse and ISO ePM1 according to ISO 16890 (G4/F7)
ComfoAir E350
Qv
m3/h
Pst
Pa
P
W
cos φ
-
SFP
Wh/m3
Lw, supply
dB(A)
Lw, return
dB(A)
Lw, casing
dB(A)
1 150 25 22 0.38 0.15 49 36 34
2 200 50 36 0.42 0.18 53 40 38
3 245 50 46 0.44 0.19 56 42 41
4 250 100 59 0.46 0.24 59 44 43
5 300 100 73 0.47 0.24 62 47 46
6 350 100 90 0.48 0.26 65 49 49
7 250 150 71 0.47 0.28 61 46 45
8 300 150 86 0.48 0.29 63 48 48
9 350 150 104 0.49 0.30 66 51 50
1
23
56
89
0,17
0,22
0,27
37
40
43
46 49
4
7
0
50
100
150
200
250
0 50 100 150 200 250 300 350
Pst (Pa)
Qv (m³/h)
ComfoAir E 350
SFP (Wh/m³) Lw (dB[A]) qv_max
SFP in Wh/m³ calculated based on the details as per
EN13141-7: 2010
Cos φwith preheater deactivated
Lw in dB(A) reference 10ˉ¹² W
Casing radiation measured according to ISO 3741: 2010
Supply and extract air noise measured according to ISO
5135: 1997 (values are corrected for muzzle reflection)
1According to EN13141-7:2010
2At -15°C and maximum airflow.

EN - 7
4.1 Configuration of the unit
A
F
B C
E
D
K
G
J
H
I
Identification Part
A Identification plate with all important details of the unit (not illustrated).
B Inscription with the air connections on the protective cover of the display.
C Power cable with 230 V plug (not illustrated).
D 2 adjustment caps.
E Input for connecting a bathroom switch.
F 4 connections for the air ducts.
G 2 condensation drains to drain the condensation of the warm extract air
H Front plate
I Main PCB behind the front plate and protective cover of the display.
J Touchscreen display for readout and programming of the unit.
K 0-10 V input

8 - EN
4.2 Connection diagram
Key: Meaning
Code Meaning Code Right-hand unit Left-hand unit
PE Green / Yellow B1 BYPASS MOTOR 11 extract air BYPASS MOTOR 20 outdoor air
N / BU Blue B11 BYPASS MOTOR 20 outdoor air BYPASS MOTOR 11 extract air
L / BK Brown or black M1 FAN 22 supply air FAN 12 exhaust air
WH White M11 FAN 12 exhaust air FAN 22 supply air
RD Red S1 RH + TEMP SENSOR 11 extract air RH + TEMP SENSOR 20 outdoor air
VT Violet S11 RH + TEMP SENSOR 20 outdoor air RH + TEMP SENSOR 11 extract air
GN Green S2 PRESSURE SENSOR 22 supply air PRESSURE SENSOR 12 exhaust air
YE Yellow S22 PRESSURE SENSOR 12 exhaust air PRESSURE SENSOR 22 supply air
GY Grey S3 RH + TEMP SENSOR 22 supply air RH + TEMP SENSOR 12 exhaust air
DISPLAY Display S33 RH + TEMP SENSOR 12 exhaust air RH + TEMP SENSOR 22 supply air
RF RF PCB S4 n/a TEMP SENSOR 21 outdoor air after
preheater
VV Preheater S44 TEMP SENSOR 21 outdoor air after
preheater
n/a
C1 0-10 V input
C2 Bathroom switch
C3 n/a
C4 Malfunction / dirty filter alert
(LED SAI Flash)
Output voltage at malfunction /
alert = 5 V
SA 0-3V
EP N L M H
*230V 50Hz
Switch
Schalter
Junction box
Externe Anschlussdose
Interrupteur
Boite de raccordement
+
-
Flash SAI 1-3V
EP N L M H
M H
L
261
542
1
3
*230V 50Hz
Switch
Schalter
Interrupteur
Junction box
Externe Anschlussdose
Boite de raccordement
Gelb/Grün
Blau
Braun
Schwarz
Grau
Jaune/Vert
Bleu
Brun
Noir
Gris
PE
N
L *
M *
H *
Yellow/green
Blue
Brown, low preset
Black, middle preset
Grey, high preset
SA 1-3V
EP N L M H
2
1
4
*230V 50Hz
Switch
Schalter
Interrupteur
Junction box
Externe Anschlussdose
Boite de raccordement
A control panel must always be connected to operate the unit!
* Unplug the unit from the wall outlet to disconnect it from the power supply.
If the unit does not have a plug, use a switch according to EN 60335-1 (with switch-off
of all poles and 3 mm overvoltage category III).

8 - EN EN - 9
Front view of main PCB

10 - EN
4.3 Dimension sketch
9
10 - NL
4.3 Maatschets
40
850
60
235
10
725
490
123
560
160 190
280,5
265 250
100
180 200
CA300 CA400
Above view
Frontal view
Below view
Side view
Maßskizzen
10 - NL
4.3 Maatschets
40
850
60
235
10
725
490
123
560
160
190
280,5
265 250
100
180 200
CA300 CA400
10 - NL
4.3 Maatschets
40
850
60
280
10
725
490
123
560
160 190
280,5
265 250
100
180 200
CA300 CA400
Top view
Front view
Bottom view

EN - 11
5.1 Wall mounting
≥280mm
≥1080mm
640mm
1 2
1 2
Install the unit against a wall with a
minimum mass of 160 kg/m2.
The height given is just an indication. The type
of condensation drain selected and the air ducts
determine the exact height.
Mount the bracket on the wall.
■Ensure the openings in the bracket are
directed upwards;
■Ensure that the bracket hangs level.
Hang the unit on the wall using the mounting
bracket.
■For Zehnder ComfoPipe Plus air ducts: use
opening 1;
■For all other air ducts: use opening 2;
34Example Example
controls accessories
5Example of siphon
Ensure the unit is level using the adjustment
caps at the rear of the unit.
Install the required controls and accessories
according to the instructions in the
corresponding manuals.
Install the siphon to the bottom of the unit as
described in the section on the condensation
drain.
6Example air duct 7Example
valve
8
Install the air ducts to the unit as described in
the section on air ducts.
Only remove the protective cover just
before you install the air ducts to the
unit.
Install the valves as described in the section on
valves.
Commission the unit as described in the section
on commissioning.
5 Installation procedures
During installation, take account of electromagnetic
interference.
■Ensure that there is a barrier (e.g. separate duct
or compartment) or minimum distance of 150 mm
between the interfering power cables (e.g. 230 V)
and cables sensitive to interference (e.g. testing, low
voltage, interface, LAN, digital or analogue signal).
■Make sure interfering and sensitive cables cross each
other in perpendicular.
■Ensure that the cables used for the controls meet
the requirements specified in the section “Technical
specifications”.
These measures will limit the EMC disruptions as much
as possible and ensure the best communication.

12 - EN
5.2 Floor mounting
1100
mm
250
mm
1Example of instruction 2
Use a Zehnder mounting frame on the floor
(available as an optional extra) for walls
with a mass of less than
160 kg/m2. This will reduce contact noise
as much as possible.
Install the mounting frame according to the
instructions in the corresponding manual.
Place the unit on the mounting frame.
■Make sure the unit is locked in place.
3Continue with step 4 of the wall-mounting procedure.
5.3 Installation of the condensation drain
ART.NR. : 200502195
ODA
EHA ETA
SUPETA
SUP ODA
EHA
Programming air specifications
123
Connect the unit to the mains power.
Select the language and confirm if the siphon
is assembled the correct way.
See above for installation of siphon.
The unit will now carry out an automatic
selftest. This takes about 4 minutes.
45 6
Close all windows and doors.
Fully open all valves connected to the ducting of
the ventilation system.
Set the required total air volume for the
MAX. DURCHFLUSS on the unit's display.
(MENU > LOGIN > PRESETS >
HOHE EINSTELLUNG)
(MENU > LOGIN > BALANCE EINSTELLUNG)
(MENU > LOGIN; Password = 4210)
Go to the installer settings.
The fans will follow the preset setting
automaticly and the unit is now in
commissioning mode for 1 hour.
78
Example of fl ow meter
Press to switch the commissioning mode
off again directly without saving the value
entered.
Press to save the value entered and switch
off the commissioning mode.
REPEAT THESE STEPS FOR THE MIDDLE AND
LOW PRESET
Measure the air volumes of each opened valve
using a fl ow meter.
Write them down.
Set each open valve to the desired air volume for
that room.
Measure again the air volumes of each set valve
using a fl ow meter.
Check whether the fl ow is in line with the norm
at each valve.
Everything in order:
Press to switch off the commissioning
mode.
Complete an installation/test report. A sample
installation/test report can be found at the back
of the user manual.
Flows not in line with norm:
Return to step 6.
ZGDE-QuickGuide _ODS80494, V0318, DE
3/4
Installation of air ducts and siphon
(according DIN 12056)
Legend:
R Supply and return air on the right-hand side
L Supply and return air on the left-hand side
ODA Fresh air
SUP Supply air
ETA Extract air
EHA Exhaust air
Example of valve
L (Left) R (Right)
Left-hand version Right-hand version
The condensation formed in the unit must be drained
off frost-free, at a gradient and incorporate an air-seal
(siphon). To drain the condensation from the unit, two
bayonet connections are located on the bottom of the
unit. These connections are not airtight. Consequently,
it is necessary to close the unused connection with the
sealing cap supplied.
Always use a dry siphon and not a conventional
standard siphon, as the latter can dry out.
1. Connect the condensation drain seal cap to the
Zehnder bayonet connector on the supply/extract-air
side of the unit.
(Left-hand version = left side;
Right-hand version = right side).
2. Connect the condensation drain adapter to the
Zehnder bayonet connector on the outdoor/extract-
air side of the unit.
(Left-hand version = right side;
Right-hand version = left side).
3. Connect the dry siphon to the condensation drain
adapter. Take account here of the following matters:
■The condensation drain adapter supplied is a
smooth tube with a diameter of 32 mm;
■Zehnder recommends using a sealing sleeve
to create an airtight connection between the
condensation drain adapter and dry siphon. The
condensation drain is not suitable for gluing;
■Ensure that the pipes fitted never rise above the
underneath of the unit;
■Fit a dry siphon that is suitable for an
underpressure of at least 500 Pa to guarantee an
airtight seal. For a siphon with a ball as a dry lock,
this can be achieved by fitting a pipe or hose of at
least 90 mm between the dry lock and the Zehnder
bayonet connector;
■Allow the connected dry siphon to drain freely into
the siphon of the domestic sewer.
Ensure that the water seal connected to the
domestic sewer is always full of water. This prevents
unpleasant odours.

12 - EN EN - 13
5.4 Installation of the air ducts
Air duct system
Zehnder ComfoFlat Zehnder ComfoTube
Zehnder ComfoPipe (Plus)
The unit can be installed with a special Zehnder air duct
system. Read the installation instructions for the air duct
system first. The next aspects must always be kept in
mind during the installation of the air ducts:
To prevent possible contact with the
running fans, the air ducts with a
minimum length of 900 mm must be
attached to the unit before connecting
the power supply.
■Remove the protective cover just before mounting the
air ducts to the unit;
■The distance (E) between the opening of the outdoor
air duct (A) and the opening of the exhaust duct (B)
must be sufficient to prevent a short circuit between
the airflows.
■The position of the outdoor-air opening relative to
other possible sources of stale air is very important
(other air exhausts, street instead of garden, etc.);
■Install the exhaust-air duct (D) to drain to the unit;
■Insulate all ducts so they are vapour-proof (C). This
prevents leakages and the formation of condensation
on the outside of the duct;
■Zehnder recommends that you fit thermal and
moisture resistant insulation to the supply duct from
the unit up to the supply valves. This will prevent
unnecessary temperature loss in the summer and
winter;
■Install the air ducts with as little air resistance as
possible and free from air leakage;
Dimensions Minimum diameter of air ducts
350 160 mm
■Ensure that the inside of the air ducts is entirely free
of obstruction. Air ducts must not have any sharp
bends, dents or long screws on the inside. Obstacles
will affect the performance and the maintenance of
the system;
■Fit a silencer directly to the supply and extract air
connections;
■Do not install a flexible air duct system. This will
disrupt the basic performance of the balanced
ventilation system. If a semi-flexible air duct system
is required, then only use a system approved by
Zehnder. Any other semi-bendable duct will disrupt
the performance of the balanced ventilation system;
■Do not install a powered extractor hood to the
system.
Key
Code Meaning
ODA Outdoor air
SUP Supply air
ETA Extract air
EHA Exhaust air
R Supply and extract air on the right-hand side
L Supply and extract air on the left-hand side
SUP
ODA
ETA
EHA
R
SUP ODA
ETA EHA
L

14 - EN
6 Commissioning procedures
6.1 Overview of the display
The unit has a touchscreen display for readout and
programming the unit.
Main screen of display
C
DA
B
Menu screen of display
G
H
E
N
F
I
J
M
L
K
# Explanation
A Current airflow:
■No icon = No ventilation
■= LOW SETTING;
■= MEDIUM SETTING;
■= HIGH SETTING;
B Current status:
■Green = The unit is operating correctly;
■Orange = Replace filters;
■Red = Malfunction.
C Child lock is engaged.
D Icon for activating the menu screen.
E Icon for activating the comfort temperature menu.
F Icon for activating the filter replacement menu.
G Icon for activating the error readout menu.
H Icon for activating the installer/service menu.
I Arrow up:
■Increase value;
■To previous error alert.
J Arrow down:
■Decrease value;
■To next error alert.
K Selection check box for activating the text shown.
Any changes are saved.
L Arrow to return to the previous screen.
Any changes are NOT saved.
M Identification menu for the fitter / service engineer.
N Icon for activating the option menu.

14 - EN EN - 15
6.2 Service menu
The service menu lists all the steps required for
commissioning the unit and tracing the causes of any
malfunction.
The service menu is protected by a password (4210)
that remains active for at least 15 minutes. Each number
of the password must be entered individually with the
arrow keys and confirmed with the confirmation key.
Menu structure SERVICE MENU
Login code: 4210
FILTER ALERT
ALTITUDE
VENTILATION SETTINGS
TEMPERATURE (Readout)
HIGH SETTING
OUTDOOR AIR TEMPERATURE
MEDIUM SETTING
EXHAUST AIR TEMPERATURE
LOW SETTING
EXTRACT AIR TEMPERATURE
FANS (Readout)
SUPPLY AIR TEMPERATURE
SUPPLY FAN [RPM]
FIREPLACE MODE (YES/NO)
PREHEATER TEMPERATURE
EXHAUST FAN [RPM]
BALANCE SETTING
SERVICE MODE
SUPPLY FAN [%]
UNIT SPECIFICATION
EXHAUST FAN [%]
ORIENTATION
SUPPLY FAN [m3/h]
TYPE
EXHAUST FAN [m3/h]
VERSION [SW]
BALANCE SETTING
RF SETTING
ANALOGUE 0-10 V
ACTIVATION
ACTIVATION
METHOD
METHOD
SETPOINT (SET)
SETPOINT (SET)
MIN. SETTING (CONTROL)
MIN. SETTING (CONTROL)
MAX. SETTING (CONTROL)
MAX. SETTING (CONTROL)
P VALUE (SET)
P VALUE (SET)
I VALUE (SET)
I VALUE (SET)
CONTROL
READOUT
SYSTEM TEST
CONTROL
READOUT
PREHEATER
FACTORY RESET

16 - EN
6.3 Programming air specifications
1 2 3
Close all windows and doors.
Open all valves connected to the ventilation
system via the ducts.
Connect the device to the mains.
Select a language and confirm that the siphon is
mounted correctly. Check the above illustration
for more information about the installation of the
siphon.
Go to the settings for the installer.
(MENU > Login; Login code= 4210
45
The fans will automatically start rotating
to the set position. The unit is in the
commissioning mode for one hour.
6Example of a flow meter
Set the required total air flow to the maximum
flow rate. (MENU>Login>VENTILATION
SETTINGS>HIGH SETTING)
= Air flow almost at limit value
= Air flow insufficient
If the limit value is lower than the desired air flow,
a further system test must be carried out.
(MENU>Login>SYSTEM TEST) For more
information, see chapter 6.14.
Press to switch the commissioning mode off
again directly without saving the value entered.
Press to save the value entered.
REPEAT THESE STEPS FOR THE MEDIUM AND
LOW SETTINGS
Measure the air flow at each opened valve using
a flow meter.
Write down the air flow for these valves.
Adjust the opened valves to the required air flow
per room.
Measure the air flow again at each opened valve
using a flow meter.
Check that the air flow complies with the
standard for each opened valve.
78 9
If the air flow is fine everywhere:
Press to exit the commissioning mode.
Complete an installation/test report. An example
can be found in the back of the user manual.
The unit’s installation height must be specified in
the “ALTITUDE” menu.
(MENU>Login>ALTITUDE>)
In the menu BALANCE SETTING an unbalance
between supply and exhaust air can be set.
(MENU>Login>BALANCE SETTING>BALANCE
FINE TUNE)
BALANCE SETTING selection: ‘+’= more exhaust
air; ‘-’= less exhaust air.
With the FIREPLACE MODE setting activated,
only less exhaust air (=’-’) is possible.
FROST PROTECTION selection (without
preheater):
(BALANCE SETTING>FIREPLACE MODE)
■FIREPLACE MODE active? YES: (Default)
Exhaust and supply air remain in balance at all
times. As a result, the unit switches off faster
in frost mode than in inactive fireplace mode.
■FIREPLACE MODE active? NO: There is more
supply air than exhaust air. So in frost mode,
ventilation is maintained longer.
Malfunctions of the preheater or bypass can only be reset after the system test has been carried out again.

EN - 17
6.4 RF controls
To enable the use of RF controls, the unit needs to be equipped with an RF PCB. The RF PCB has to be ordered separately
and can be installed later on.
1 2 3
If RF ACTIVATION is set to ON: Set the
RF ACTIVATION on the display of the
unit to OFF. (MENU>SERVICE MENU>RF
SETTING>ACTIVATION>OFF)
The power will now be removed from the RF
PCB.
Set the RF ACTIVATION on the display of
the unit to ON. (MENU>SERVICE MENU>RF
SETTING>ACTIVATION>ON)
You now have 10 minutes to register the RF
control.
Set METHOD on the display of the unit to
DISCRETE CONTROL (MENU>SERVICE
MENU>RF SETTING>METHOD>DISCRETE
CONTROL)
4
≥ 6 sec.
CHANGED
SAME
#1
RFZ: Press button “1” & and button “ ”
together for at least 6 sec.
The airflow rate of the unit changes (see the
unit's display): Registering successful.
The airflow rate of the unit does not change (see
the unit's display): Return to step
1.
Each RF control must be registered separately.
For each extra RF control, return to step 1.

18 - EN
6.5 Explanation of VENTILATION SETTINGS
menu
The building regulations describe how much fresh
supply air must be provided to each room. The
VENTILATION SETTINGS must be programmed in such
a way that the unit can supply the maximum necessary
volume of fresh air for the entire building. If only HIGH
SETTING is programmed, the unit will automatically
set MEDIUM SETTING to 66% of HIGH SETTING, and
LOW SETTING to 33% of HIGH SETTING. If MEDIUM
SETTING or LOW SETTING is programmed, this
automatic link will be lost. To recover the link, all the
unit's FACTORY SETTINGS must be restored via the
FACTORY RESET function.
FACTORY SETTINGS
ComfoAir E 350
HIGH SETTING 315 m3/h
MEDIUM SETTING 205 m3/h
LOW SETTING 105 m3/h
Once the settings screen or valve setup screen is visible,
the unit switches off all automatic programmes and runs
on the set value so that all valves can be properly set.
After touching the screen, you have 60 minutes to set all
valves. The unit then switches back automatically to the
normal operating mode and the main screen. Every time
the screen is touched, the 60-minute timer is reset. If the
settings screen or valve setup screen is exited manually,
the unit returns directly to the normal operating mode
and after 15 minutes without being touched the unit
returns automatically to the main screen.
6.6 Explanation of REPLACE FILTER warning
The filter warning appears by default 21 days before the
filters need to be replaced. This gives the user enough
time to purchase new filters before the dirty filters are
to be replaced. It is possible to set the alert to appear
earlier by increasing the number of filter order days in
the service menu FILTER ALERT. The filters must be
replaced at least once every 180 days.
6.7 Explanation of ALTITUDE menu
This value compensates for the influence of altitude on
the air volume. In the “Altitude” menu, the altitude of the
installation location of the unit must be specified.
6.8 Explanation of TEMPERATURE menu
The unit is equipped with 5 temperature sensors. The
readout of the current value of these sensors appears in
the TEMPERATURE menu in the sequence given below.
Meaning
OUTDOOR AIR
TEMPERATURE
(TEMP SENSOR 20)
Outdoor air temperature prior to
the preheater
EXHAUST AIR TEMPERATURE
(TEMP SENSOR T12)
Exhaust air temperature
EXTRACT AIR TEMPERATURE
(TEMP SENSOR T11)
Extract air temperature
SUPPLY AIR TEMPERATURE
(TEMP SENSOR T22)
Supply air temperature
PREHEATER TEMPERATURE
(TEMP SENSOR T21)
Outdoor air temperature after the
preheater.
6.9 Explanation of FANS menu
The unit is equipped with 2 fans. The readout of the
current value of these fans appears in the FANS menu in
the sequence given below.
Meaning
SUPPLY FAN [RPM]
(FAN 22)
Speed of the supply fan.
EXHAUST FAN [RPM]
(FAN 12)
Speed of the exhaust fan.
SUPPLY FAN [%]
(FAN 22)
Control percentage (fan duty) of
the supply fan.
EXHAUST FAN [%]
(FAN 12)
Control percentage (fan duty) of
the exhaust fan.
SUPPLY FAN [m3/h]
(FAN 22)
Airflow rate (flow) of the supply
fan.
EXHAUST FAN [m3/h]
(FAN 12)
Airflow rate (flow) of the exhaust
fan.

EN - 19
6.10 Explanation of UNIT SPECIFICATION menu
In the UNIT SPECIFICATION menu, the readout of the
basic unit details appears in the sequence below.
Meaning
ORIENTATION Show the current orientation of the unit:
■RIGHT UNIT has the air connectors that
enter the home on the left-hand side
and the siphon connector to the right;
■LEFT UNIT has the air connectors that
enter the home on the right-hand side
and the siphon connector to the left;
TYPE Show the current version of the unit
■ComfoAir E 350 indicates that the unit
has a maximum air capacity of 350
m3/h;
■VL/VR indicates that the unit is supplied
from the factory with a preheater
VERSION Indicates that current software version.
6.11 Explanation of the BALANCE SETTING
menu
The unit is equipped with a constant volume control
which ensures that the same amount of air is supplied
as is extracted. The unit thus factors in the difference in
duct resistance. Leave this value in the menu at 0%, so
both airflows are always in balance.
In the “Balance setting” menu, an unbalance between
supply air and extract air can be set.
(MENU>Login>BALANCE SETTING>BALANCE
SETTING)
Select BALANCE SETTING
‘+’ = more extract air ; ‘-’ = less extract air; when
fireplace control is activated, only less extract air (= ‘-’)
is possible.
Select frost protection (without preheater)
(Balance setting > Fireplace mode)
■Fireplace mode active? YES: (Standard) Extract air
and supply air always remain in balance. This will
cause the unit to switch off sooner in frost conditions
than in inactive fireplace mode.
■Fireplace mode active? NO: More extract air than
supply air is conveyed. This ensures longer operation
in frost conditions until deactivation.
6.12 Explanation of ANALOGUE 0-10 V menu
(standard) and RF SETTING (optional)
The unit can be controlled with any analogue 0-10 V
signal and/or an RF signal. To ensure the control runs
properly, the following parameters can be set in the
sequence given below.
Meaning
ACTIVATION ■ON indicates that the unit should detect
a 0-10 V or RF signal;
■OFF indicates that the unit does not
have to detect a 0-10 V or RF signal.
METHOD ■DISCRETE CONTROL indicates that
the unit must process the 0-10 V or RF
signal as a control signal using 3 steps;
■CONTROL indicates that the unit must
process the 0-10 V or RF signal as a
control signal;
■SET indicates that the unit must
process the 0-10 V or RF signal as a
regulate signal.
SETPOINT1The setpoint at which the unit starts
regulating.
MIN. SETTING.2The minimum incoming value the unit
must use to exercise control. (LOW
SETTING)
MAX. SETTING.2The maximum incoming value the unit
must use to exercise control. (HIGH
SETTING)
P VALUE1The proportional bandwidth value at which
the unit starts regulating.
I VALUE1The integration point at which the unit
starts regulating.
CONTROL ■POSITIVE indicates that the unit must
speed up at a higher control value or a
too low regulation value;
■NEGATIVE indicates that the unit must
slow down at a higher control value or a
too low regulation value.
READOUT The currently incoming 0-10 V or RF
signal.
1Only relevant if SET METHOD is selected.
2Only relevant if CONTROL METHOD or DISCRETE
CONTROL METHOD is selected.
6.13 Explanation of the PREHEATER menu
In the PREHEATER menu, the use of a preheater can be
set.
If no preheater is present, the unit switches to “Frost
protection without preheater” in frost mode.

20 - EN
6.14 Explanation of the SYSTEM TEST menu
A system test can be initiated in the SYSTEM TEST
menu.
(MENU>Login>SYSTEM TEST)
Meaning
SYSTEM TEST
CANCELLED
MAX. BELOW 150 m3/h
This error must be resolved in order to
carry out a system test. Otherwise errors
of the preheater or bypass cannot be
resolved!
Possible causes:
■HIGH SETTING set lower than 160 m3/h
■Air volume of valves not set correctly
(valves too tight)
■Air ducts have too much resistance
■Outdoor air grille blocked
■ALTITUDE entered incorrectly
■Filters are dirty
■Heat exchanger is frozen
Preset 3 supply air
(m3/h)
ACTUAL (SETTING)
The air volume on the supply side (ODA
& SUP) is set lower. Accept this or reduce
the air resistance on the supply side of the
system. Then carry out another system
test.
Possible causes:
■Air volume of valves not set correctly
(valves too tight)
■Air ducts have too much resistance
■Outdoor air grille blocked
■ALTITUDE entered incorrectly
■Filters are dirty
Preset 3 extract air
(m3/h)
ACTUAL (SETTING)
The air volume is lower than set on the
extract side (ETA & EHA). Accept this or
reduce the air resistance on the extract
side of the system. Then carry out another
system test.
Possible causes:
■Air volume of valves not set correctly
(valves too tight)
■Air ducts have too much resistance
■ALTITUDE entered incorrectly
■Filters are dirty
■Heat exchanger is frozen
6.15 Explanation of RESTORE TO FACTORY
SETTINGS menu
The factory settings of the unit are permanently saved
to the control PCB. Using the RESTORE TO FACTORY
SETTINGS menu, the unit can be switched back to the
factory settings. This permanently overwrites all adjusted
settings. After the reset, the unit will start running as if it
had just left production. The air specifications, analogue
input and RF controls (if unit is equipped with) will have
to be reset/re-programmed.
If only the malfunction codes need to be reset, then
use the reset function in menu errors on the first menu
screen.
6.16 Explanation of control methods
What is SET METHOD?
Regulating involves maintaining the programmed set
point. If the incoming signal of the desired set point
deviates, the unit will adapt the outgoing signal to arrive
at the desired set point.
What is POSITIVE?
In the event of positive regulating, power will go up if
the measurement is below the set point. In the event of
a higher measurement, power will go down. Most of the
pressure sensors use positive regulating.
Signal
Geschwindigkeit
What is NEGATIVE?
In the event of negative regulating, power is increased
if the measurement is higher than the set point. In the
event of a lower measurement, power is decreased.
Signal
Geschwindigkeit
Speed
Speed