Zehnder Rittling ComfoAir 350 User manual

ComfoAir 350
Manual

II
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 manual.

Table of Contents
1 INTRODUCTION ............................................................................................................................................. 1
1.1 Preface ................................................................................................................................................. 1
1.2 CE marking .......................................................................................................................................... 1
1.3 Guarantee and liability........................................................................................................................ 1
1.3.1 Guarantee conditions............................................................................................................... 1
1.3.2 Liability...................................................................................................................................... 1
1.4 Safety .................................................................................................................................................. 2
1.4.1 Safety regulations..................................................................................................................... 2
1.4.2 Safety provisions and measures.............................................................................................. 2
1.4.3 Pictograms used....................................................................................................................... 2
2 FOR THE USER............................................................................................................................................... 3
2.1 Glossary ............................................................................................................................................... 3
2.1.1 Balanced ventilation................................................................................................................. 3
2.1.2 Heat recovery............................................................................................................................ 3
2.1.3 Bypass for free cooling ............................................................................................................ 3
2.1.4 Frost protection ........................................................................................................................ 3
2.1.5 Chimney sweep programme.................................................................................................... 3
2.2 Available operating devices ............................................................................................................... 4
2.2.1 Display ...................................................................................................................................... 4
2.2.2 3-position switch ...................................................................................................................... 4
2.2.3 Bathroom switch ...................................................................................................................... 4
2.3 Maintenance by the user.................................................................................................................... 8
2.3.1 Cleaning or replacing the filters............................................................................................... 8
2.3.2 Cleaning the valves (in your dwelling) ..................................................................................... 8
2.4 Malfunctions........................................................................................................................................ 9
2.4.1 Malfunction alerts on digital operating devices...................................................................... 9
2.4.2 3-position switches with malfunction indicator ...................................................................... 9
2.4.3 What to do in the event of a malfunction ................................................................................ 9
2.5 End of useful life.................................................................................................................................. 9
Contents III

3. FOR THE INSTALLER ................................................................................................................................... 10
3.1 ComfoAir............................................................................................................................................ 10
3.2 Technical specifications ................................................................................................................... 11
3.3 Dimension sketch ............................................................................................................................. 13
3.4 Installation conditions ...................................................................................................................... 14
3.5 Installation of the ComfoAir ............................................................................................................. 14
3.5.1 Transport and unpacking ....................................................................................................... 14
3.5.2 Checking the delivery............................................................................................................. 14
3.6 Wall mounting.................................................................................................................................... 14
3.6.1 Connection of the air ducts.................................................................................................... 15
3.6.2 Connection of the condensation drain .................................................................................. 15
3.7 Commissioning the ComfoAir.......................................................................................................... 16
3.7.1 Display on the unit.................................................................................................................. 16
3.8 Programming air specifications ...................................................................................................... 20
3.9 Maintenance by the installer............................................................................................................ 20
3.9.1 Inspecting the heat exchanger and fans ............................................................................... 21
3.10 Malfunctions...................................................................................................................................... 22
3.10.1 Malfunction alerts on the digital operating device ...............................................................22
3.10.2 Trouble shooting..................................................................................................................... 23
3.10.3 Malfunctions (or problems) without alarms........................................................................... 25
3.11 Service parts...................................................................................................................................... 26
3.12 Wiring diagram: ComfoAir 350 Basic – LEFT-HAND version......................................................... 27
3.13 Wiring diagram: ComfoAir 350 Basic – RIGHT-HAND version ...................................................... 28
3.14 ComfoAir 550 installation measuring report...................................................................................29
IV Contents

1
Introduction 1
1 Introduction
This chapter provides general information on the ComfoAir.
1.1 Preface
In addition to this general chapter, this manual con-
sists of:
• A part for the user,
• A part for the installer.
Carefully read this manual
before use.
- User Chapters 1 and 2.
- Installer Chapters 1 and 3.
This manual provides all the information required
for safe and optimal installation, operation and
maintenance of the ComfoAir. It is also intended as
a reference for servicing, so that this can be carried
out in a responsible manner. The device is subject
to continuous development and improvement. As a
result, the ComfoAir 350 may slightly differ from the
descriptions.
NOTE
This manual has been compiled with
the utmost care. However, no rights can be
derived from it. In addition, we at all times
reserve the right to change the contents of
this manual, without prior notice.
1.2 CE marking
The device's name is ComfoAir 350. In the following
it will be referred to as ComfoAir.
The ComfoAir is a balanced ventilation system with
heat recovery in order to create healthy, balanced
and energy-efficient ventilation in houses. The
ComfoAir identification plate is shown below.
1.3 Warranty and liability
1.3.1 Guarantee conditions
The ComfoAir is covered by a manufacturer’s war-
ranty for a period of 24 months after fitting up to
a maximum of 30 months after the date of manu-
facture. Warranty claims may only be submitted for
material faults and/or construction faults arising
during the warranty period. In the case of a war-
ranty claim, the ComfoAir must not be dismantled
without written permission from the manufacturer.
Spare parts are only covered by guarantee, 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 device 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.
1.3.2 Liability
The ComfoAir has been designed and manufac-
tured for use in “balanced ventilation systems”. Any
other use is deemed unintended use and can lead
to damage to the ComfoAir or personal injury, for
which the manufacturer cannot be held liable.
The manufacturer is not liable for any damage origi-
nating from:
• Non-compliance with the safety, operating and
maintenance instructions in this manual;
• The use of components not supplied or recom-
mended by the manufacturer;
• Responsibility for the use of such components
lies entirely with the installer;
• Normal wear and tear.
Voltage Hertz
Current
Power
Capacitor
Phase
Articlecode
Type
Serial number
Protecion class Insolation class

1
2 Introduction
1.4 Safety
1.4.1 Safety regulations
Always comply with safety regulations in this man-
ual. Non-compliance with the safety regulations,
warnings, notes and instructions in this manual can
cause personal injury or damage to the ComfoAir.
• The electrical installation of the ComfoAir may
only be performed by a qualified electrician in
accordance with Part P of the Building Regula-
tions;
• Installation of the ComfoAir must be carried out
in accordance with the general and locally ap-
plicable construction, safety and installation
instructions of the local council, electricity and
water boards or other agencies such as the GIW
(Dutch Home Warranty Institute);
• Observe the safety regulations, warnings, com-
ments and instructions as prescribed in this
manual at all times;
• Keep this manual with the ComfoAir throughout
its life;
• Instructions with regard to cleaning or replacing
the filters of the intake and exhaust valves must
be carefully observed;
• The specifications stated in this document may
not be changed;
• Modifying the ComfoAir is not allowed;
• The ComfoAir is not suitable for connection to
the three-phase mains;
1.4.2 Safety provisions and measures
• The ComfoAir cannot be opened without using
tools;
• It should not be possible to touch the fans,
therefore ducting must be connected to the
ComfoAir at a minimum duct length of 900mm.
1.4.3 Pictograms used
The following pictograms are used in this manual:
Point of attention.
Risk of:
- damage to the device;
- personal injury to the user, or;
- performance of the device is compro-
mised if instructions are not observed
carefully.

2 For the user
This chapter describes how to operate the ComfoAir.
For the user 3
2
2.1 Glossary
The ComfoAir features:
• Balanced ventilation;
• Heat recovery;
• Bypass for free cooling;
• Frost protection;
• Chimney sweep programme;
• Reheater (optional);
A concise explanation of these concepts/features is
given in the paragraphs below.
2.1.1 Balanced ventilation
The ComfoAir is a balanced ventilation system.
Balanced ventilation means that pollutants from
the kitchen, the bathroom, the toilet(s) and possi-
bly the storage room are extracted, while the same
amount of fresh air is blown into the living room and
bedrooms. Gaps under the doors ensure a good
through-flow in the dwelling. The air circulation is
in balance.
Ensure that these gaps are never obstructed
by draught excluders or deep-pile carpet, for
example. Otherwise the system will not func-
tion optimally.
A balanced ventilation system consists of:
• ComfoAir (A);
• Duct system for the supply of outdoor air (B)
and the exhaust of indoor air (C);
• Supply valves in the living room and bedrooms
(D);
• Exhaust valves in the kitchen, bathroom, the
toilet and (if present) the storage room (E).
B
A
C
E
D
F
D
D
D
E
E
2.1.2 Heat recovery
Besides ensuring a healthy balance between in-
coming and outgoing air, the ComfoAir also pro-
vides the benefits of heat recovery. Heat recovery
means that heat from the extracted air is transferred
to the fresh, and usually colder, air from outside the
building.
2.1.3 Bypass for free cooling
The bypass is often used during hot days in the
summer season. By allowing colder outside air in
at night, the indoor temperature of the dwelling can
be kept low during hot days. The bypass works au-
tomatically. All you have to do is set the required
comfort temperature.
2.1.4 Frost protection
The ComfoAir is also fitted with a frost protection
device. This is an automatic protective system that
temporarily reduces (or even briefly stops) the sup-
ply of outdoor air to the ComfoAir if there is a risk
of freezing in the ComfoAir. This can occur in the
event of moderate to sharp frost during the winter
months.
2.1.5 Chimney sweep programme
The ComfoAir is fitted with an Chimney sweep pro-
gramme. The Chimney sweep programme is used in
houses that have a fireplace, as there is a risk of air
being sucked back from the chimney. The Chimney
sweep programme works automatically but requires
activation by the installer. While the Chimney sweep
programme is activated the supply and exhaust fan
can not be turned off manually.

2.2 Available operating elements
The ComfoAir can be fitted with the following oper-
ating elements:
• Display on the unit;
• 3-position switch;
• Wireless 3-position switch;
• 3-position switch with malfunction indicators;
• Bathroom switch to temporarily select the
highest ventilation position.
A concise explanation of these operating elements
is given in the paragraphs below.
2.2.1 Display on the unit
The ComfoAir can be operated by means of a digital
display which is mounted on the unit.
select menu up
OK down
supply off supply on
(led green) (led green)
comfort temperature
Shown in display
Ventilation setting absent
Ventilation setting low
Ventilation setting medium
Ventilation setting high
Menu symbol
Malfunction code (flashes)
Bypass
Access to the menus
Se-
quence
Press Display Description
1 MENU P2 Time delay
2▲ P9 Status
3▲P1 Status
Example
Setting bathroom switch delay
Se-
quence
Press Display Description
1 MENU P2 Time delay
2 OK P21 Delay timer
3▲P22 Select 22
4 OK 30 Current setting
5
▼(10 x or
press and
hold)
20 Select 20
6 OK P22 Sets the value to 20
7 MENU P2
8 MENU 1 Fan setting
2.2.2 3-position switch
A 3-position switch can be used to set the venti-
lation positions of the ComfoAir. One or multiple
3-position switches can be fitted in the house (e.g.
in the kitchen). The following types of switches can
be used:
• Type 1 JStandard 3-position switch;
• Type 2 J3-position switch with LED
for malfunction and filter alerts;
• Type 3 JWireless 3-position switch with
LED for malfunction and filter indication.
If multiple position switches are available in
the house, the ComfoAir will switch to the
highest ventilation setting unless overruled by
an automated software programme.
Setting the ventilation using
3-position switch(es)
A 3-position switch can be used to set 3 different
ventilation positions.
• Position 1 JLow.
- Use for low ventilation levels.
• Position 2 Normal.
- Use if you require normal ven-
tilation.
• Position 3 High.
- Use this position during cook-
ing, showering and when addi-
tional ventilation is needed.
3
2
1
2.2.3 Bathroom switch
A bathroom switch can be used to temporarily set
the ComfoAir in the highest ventilation level. This
switch is mostly fitted in the bathroom to extract
any excess moisture after showering, as soon as
possible. The bathroom switches vary widely in
model and are therefore not illustrated here.
If required, the bathroom switch can be turned on
and off using a time delay entered via a digital op-
erating device.
Delay timer
This ensures that the ComfoAir does not switch on
at the highest setting when activated, but first waits
for the delay timer to run its course.
2
4 For the user
MENU
A
OK
2
3
X X
X X
1
•

2
5For the user
If the bathroom switch is deactivated during
the delay timer period, then the ComfoAir
will remain at its current ventilation setting
and not switch to the highest setting.
The delay timer does not work with all types
of bathroom switches (e.g. pulse switches).
Overrun timer
This ensures that the ComfoAir does not switch back
to the default (or preprogrammed) setting when de-
activated, but first waits for the overrun timer to run
its course. Once the programmed overrun timer is
complete, the ComfoAir returns to the default (or
preprogrammed) ventilation setting.
If the bathroom switch is turned off within
the programmed overrun timer period, then
the overrun function will be terminated.
Light switch
The functions of the bathroom switch can also be
integrated into a light switch.

2
6 For the user
Menu P1 Status of programmes
Ventilation programmes
Sub-
menu Description Activated
P11 Is menu 21 currently active? Yes (1) / No (0)
P12 Is menu 22 currently active? Yes (1) / No (0)
P13 Is menu 23 currently active? Yes (1) / No (0)
P14 Is menu 24 currently active? Yes (1) / No (0)
P15 Is menu 25 currently active? Yes (1) / No (0)
P16 Is menu 26 currently active? Yes (1) / No (0)
Menu P2 Setting time delays
Time delay values
Sub-menu Description Mini-
mum
Maxi-
mum
Default
P21
(Optional)
Note:
Only applies to systems fit-
ted with a corded switch
and a second switch in the
bathroom.
- Low voltage input
Delay timer for the bathroom switch
(to switch to high position).
• 'x' minutes after operating the
bathroom switch, the ComfoAir
switches to the HIGH SETTING.
0 Min. 15 Min. 0 Min.
P22
(Optional)
Note:
Only applies to systems fit-
ted with a corded switch
and a second switch in the
bathroom.
- Low voltage input
Overrun timer for the bathroom
switch (to switch to normal posi-
tion).
• 'x' minutes after operating the
bathroom switch, the ComfoAir
switches back to the NORMAL SET-
TING.
0 Min. 120 Min. 30 Min.
P23
(Optional)
Note:
Only applies to systems fit-
ted with a hardwired switch.
Overrun timer for ventilation position
3.
• If ventilation setting 3 (high) is
switched on briefly (< 3 sec), the
ComfoAir remains at ventilation
setting 3 in accordance with the
time set in this menu.
If the position switch or RF remote
control is operated during this lag-
ging time, the ComfoAir will instantly
revert to the ventilation position as
set at that time.
0 Min. 120 Min. 0 Min.
P24 Filter warning
• Here the user can indicate when
the “FILTER DIRTY” alert must ap-
pear.
10 weeks 26 weeks 16
weeks

2
7For the user
Time delay values
Sub-menu Description Mini-
mum
Maxi-
mum
Default
P25
Note:
Only applies to systems fit-
ted with an RF switch.
Overrun timer for ventilation setting
3 (using " ").
• After pressing " " BRIEFLY (<
2 sec.), the ComfoAir runs at the
HIGH setting for ‘x’ minutes and
then automatically returns to the
programmed setting.
1 Min. 20 Min. 10 Min.
P26
Note:
Only applies to systems fit-
ted with an RF switch.
Overrun timer for ventilation setting
3 " ".
• After pressing " " for LONGER
(> 2 sec.), the ComfoAir runs at
the HIGH setting for ‘x’ minutes
and then automatically returns to
the programmed setting.
1 Min. 120 Min. 30 Min.
P27 n/a 0 Min. 120 Min. 30 Min.
Menu P9 Status of programmes (from menu P5)
Ventilation programmes
Sub-menu Description Activated
P90 Open fire programme active? Yes (1) / No (0)
P91 Bypass Open (=Yes) / Closed (=No)? Yes (1) / No (0)
P94 0 – 10 V programme active? Yes (1) / No (0)
P95 Frost protection active? Yes (1) / No (0)
P97 Enthalpy programme active? Yes (1) / No (0)

2
8 For the user
2.3 Maintenance by the user
As a user of the ComfoAir, you must carry out the
following maintenance:
• Cleaning or replacing the filters;
• Cleaning the valves (in the dwelling).
A concise explanation of these maintenance activi-
ties is given in the paragraphs below.
Failure to carry out (periodic) maintenance
on the ComfoAir ultimately compromises the
performance of the ventilation system.
2.3.1 Cleaning or replacing the filters
If so indicated on the digital operating device, you
must clean or replace the filters.
You will see the message “FiL” and ”tEr” appearing
alternately on the display.
To replace ...
If the filters need replacing, follow this procedure:
• Press “OK” on the display until the filter alert
disappears.
• Disconnect the power from the ComfoAir.
• Remove the handles (A) from the ComfoAir
AA
• Remove the old filters (B) from the ComfoAir
B
• Slide the new filter back into the ComfoAir.
• Refit the handles (A) to the ComfoAir.
• Reconnect te power to the ComfoAir.
To clean...
Vacuum the filters (B) with a vacuum cleaner instead
of replacing them with new filters.
When using the ComfoAir for the first time,
it is recommended to clean the filters (and
valves) first, as during the construction
phase the ventilation system could have be-
come dirty with building dust.
Replace the filters (at least) once a year.
2.3.2 Cleaning the valves (in your dwelling)
The ventilation system may be fitted with the fol-
lowing valves:
Exhaust valve (STB) Exhaust valve (STC)
Exhaust valve (STV) Exhaust valve (STK)
Supply valve (STH)
You must clean the valves (at least) twice a year:
• Remove the valve from the wall or ceiling;
• Clean the valve in a solution of soap and warm
water;
• Rinse the valve thoroughly and wipe dry;
• Place the valve back WITH EXACTLY THE
SAME SETTING (and IN THE SAME HOLE);
• Repeat this procedure for the other valves.
About the valve settings...
The installer will have set all the valves to ensure
the optimum performance of the ventilation system.
Therefore, do not change the setting of the valves.
After cleaning, make sure that all valves are
placed back with the same setting (and in
exactly the same ventilation hole in the wall
or ceiling) AT ALL TIMES. Otherwise, system
performance will be compromised.
The ventilation air is supplied and discharged by
means of valves. Gaps under doors in the dwelling
ensure that the air flows in the right direction. In or-
der to ensure that the correct ventilation volumes
are maintained in the rooms, the following must be
observed:
• Do not seal the gaps;
• Do not change the settings of the valves;
• Do not replace the valves with one another.

2
9For the user
2.4 Malfunctions
Malfunctions in the ComfoAir are reported as fol-
lows:
• The malfunction indicator on the 3-position
switch lights up;
• The malfunction alert appears on the display.
A concise explanation of these maintenance activi-
ties is given in the paragraphs below.
2.4.1 Malfunction alerts on the digital
operating device
In the event of a malfunction, the corresponding
malfunction code will be displayed on the digital
operating device of the ComfoAir. The digital oper-
ating device will always show an 'A' or an 'E', with
a number as a suffix. Please refer to the malfunc-
tion overview to find out the meaning of the relevant
malfunction alert.
2.4.2 3-position switch with malfunction
indicators
The 3-position switches that are fitted with a mal-
function indicator show when a malfunction has
occurred. Depending on the type of the 3-posi-
tion switch, this is done in one of the following two
ways:
• 3-position switch with malfunction indicator.
In the event of a malfunction (or in the event of
a filter dirty alert) the indicator lights up.
• Wireless 3-position switch with malfunction in-
dicator.
The malfunction indicators will light up once
this 3-position switch is used. One indicator
will light up green to indicate communication
has been established. Subsequently, in the
event of a malfunction (and in the event of a
filter dirty alert) both indicators will flash red 3
times. After that, both indicators will light up
green once more.
The malfunction indicator on the 3-position
switch will not light up in the event of mal-
functions alone, but will also light up in the
event of filter cleaning warnings.
2.4.3 What to do in the event of a malfunction
In the event of a malfunction, contact the installer.
Note down the malfunction code that appears on
the digital operating device. Make a note of your
ComfoAir type. This is given on the identification
plate on the top of the ComfoAir.
The system should not be disconnected from the
power supply, unless the ComfoAir must be taken
out of service due to a serious malfunction, or for
filter cleaning/replacement or any other compelling
reasons.
If the ComfoAir is disconnected from the
power supply, mechanical ventilation of the
dwelling will cease. This can lead to a build-
up of moisture and results in problems with
mould. Long-term deactivation of the Com-
foAir must therefore be prevented.
2.5 End of useful life
Consult with your supplier about what you should
do with the ComfoAir at the end of its useful life.
If the ComfoAir cannot be returned to the supplier,
avoid disposing of it with the domestic waste, and
ask your local council about the options for recy-
cling the components or processing the materials
in an environmentally friendly manner.
Furthermore, do not dispose of batteries from the
wireless switches with the normal waste, but bring
them to the specially designated disposal loca-
tions.

10 System functions
3.1 ComfoAir
The standard ComfoAir configuration consists of:
• External casing (A) of coated sheeting;
• Interior (B) of high-quality, expanded polypropylene (E)PP;
• 4 connections (C) for the air ducts;
• 2 G4 filters (D) for air purification;
• 2 energy-efficient DC motors (E) with high-efficient fan;
• HE (High Efficient) heat exchanger (with optional moisture exchanger) (F);
• PCB panel (H) with connections for the fans, the bypass, temperature sensors (T1 to T4), the 3-position
switch with or without malfunction and filter indication (optional) and the bathroom switch (optional);
• Identification plate (I) detailing information on the ComfoAir (not visible);
• Condensation drain (J) to drain the condensation of the warm return air;
• Sticker (K) detailing the air connections (not visible);
• 3-core or 5-core, 230V connection (L).
• Display (M) to read data, and for programming procedures.
3 For the Fitter
This chapter describes how to fit the ComfoAir.

11System functions
3.2 Technical specifications
ComfoAir 350 nL (normal air volumes)
Position Ventilation capacity Value
ABSENT SETTING 40 m3/h at 4 Pa 10 W
LOW SETTING 120 m3/h at 30 Pa 21 W
MEDIUM SETTING 180 m3/h at 65 Pa 44 W
HIGH SETTING 260 m3/h at 140 Pa 105 W
MAXIMUM 350 m3/h at 240 Pa 243 W
Position Ventilation capacity Value
ABSENT SETTING 40 m3/h at 4 Pa 0.08 A
L
OW SETTING 120 m3/h at 30 Pa 0.17 A
M
EDIUM SETTING 180 m3/h at 65 Pa 0.35 A
HIGH SETTING 260 m3/h at 140 Pa 0.81 A
MAXIMUM 350 m3/h at 240 Pa 1.77 A
Electricity
Power supply 230/50 V/Hz
Cos.phi 0,50 - 0,60
Supply fan noise level (at 0 m)
Position Ventilation capacity Value
ABSENT SETTING 40 m3/h at 4 Pa 36 db(A)
L
OW SETTING 120 m3/h at 30 Pa 50 db(A)
M
EDIUM SETTING 180 m3/h at 65 Pa 59 db(A)
HIGH SETTING 260 m3/h at 140 Pa 68 db(A)
MAXIMUM 350 m3/h at 240 Pa 75 db(A)
Exhaust fan noise level (at 0 m)
Position Ventilation capacity Value
A
BSENT SETTING 40 m3/h at 4 Pa 39 db(A)
L
OW SETTING 120 m3/h at 30 Pa 43 db(A)
MEDIUM SETTING 180 m3/h at 65 Pa 48 db(A)
H
IGH SETTING 260 m3/h at 140 Pa 55 db(A)
M
AXIMUM 350 m3/h at 240 Pa 61 db(A)

12 System functions
ComfoAir 350 HL (high air volumes)
Position Ventilation capacity Value
ABSENT SETTING 40 m3/h at 4 Pa 10 W
LOW SETTING 140 m3/h at 40 Pa 27 W
MEDIUM SETTING 180 m3/h at 65 Pa 44 W
HIGH SETTING 325 m3/h at 215 Pa 196 W
MAXIMUM 350 m3/h at 240 Pa 243 W
Position Ventilation capacity Value
ABSENT SETTING 40 m3/h at 4 Pa 0.08 A
LOW SETTING 140 m3/h at 40 Pa 0.21 A
M
EDIUM SETTING 180 m3/h at 65 Pa 0.81 A
HIGH SETTING 325 m3/h at 215 Pa 1.42 A
M
AXIMUM 350 m3/h at 240 Pa 1.77 A
Electricity
Power supply 230/50 V/Hz
Cos.phi 0,50 - 0,60
Supply fan noise level (at 0 m)
Position Ventilation capacity Value
A
BSENT SETTING 40 m3/h at 4 Pa 36 db(A)
L
OW SETTING 140 m3/h at 40 Pa 54 db(A)
M
EDIUM SETTING 180 m3/h at 65 Pa 68 db(A)
H
IGH SETTING 325 m3/h at 215 Pa 74 db(A)
MAXIMUM 350 m3/h at 240 Pa 75 db(A)
Exhaust fan noise level (at 0 m)
Position Ventilation capacity Value
ABSENT SETTING 40 m3/h at 4 Pa 39 db(A)
L
OW SETTING 140 m3/h at 40 Pa 45 db(A)
MEDIUM SETTING 180 m3/h at 65 Pa 55 db(A)
HIGH SETTING 325 m3/h at 215 Pa 59 db(A)
MAXIMUM 350 m3/h at 240 Pa 61 db(A)
General Specifications
HE Exchanger Material Polystyrene
Interior Material (E)PP / PA / PA
Thermal Yield 95%
Mass 39 kg

13System functions
3.3 Dimension sketch
801 35
214
761 ø180
851
845
702
ø160
ø151
354 348
264
161
572
625 269
172 172
CONDENSATION DRAIN
LEFT-HAND VERSION
CONDENSATION DRAIN
RIGHT-HAND VERSION
CABLE
CONDENSATION DRAIN ø32 (OUTSIDE)

3
14 System functions
3.4 Fitting conditions
In order to determine whether the ComfoAir can
be installed in a certain area, the following aspects
must be taken into account:
• The ComfoAir must be installed according to the
general and locally applicable safety and instal-
lation regulations of power and water compa-
nies, as well as the instructions in this manual.
• The system must be fitted to allow sufficient
room around the ComfoAir for the air connec-
tions and supply and exhaust ducts as well as
for carrying out maintenance activities.
• The room must offer the following provisions:
- Air duct connections.
- 230V electrical connection.
- Provisions for the condensation drain.
• The roof vents should be made airtight and
damp-proof. The outside air supply duct and
the air exhaust duct between the roof/wall pas-
sage and the ComfoAir must be rendered damp
proof. This prevents the formation of condensa-
tion on the outside of the ducts.
• To prevent unnecessary temperature loss in ei-
ther the summer or the winter, we recommend
fitting thermal and damp-proof insulation to the
supply ducts from the ComfoAir up to the sup-
ply valves.
• The air exhaust duct must be fitted with a dou-
ble-walled or insulated roof passage. This pre-
vents the formation of condensation between
the roof boarding. In addition, the air exhaust
duct must drain in the direction of the Com-
foAir.
• The ComfoAir must be installed in a frost-free
space. The condensation must be drained off
frost-free, at a gradient and incorporate a 'U'
bend.
• We recommend fitting both the intake and the
exhaust connections of the ComfoAir with si-
lencers located directly against the unit. For fur-
ther information, please contact Zehnder.
A 10mm gap should be left under the in-
side doors in order to ensure effective and
draught-free airflow in the house. If these
openings are obstructed, due to draught
excluders or deep-pile carpet, the airflow in
the house will stagnate. As a result, system
performance will be compromised or fail al-
together.
3.5 Installation of the ComfoAir
3.5.1 Transport and unpacking
Take the necessary precautions when transporting
and unpacking the ComfoAir.
Make sure the packing material is disposed
of in an environmentally friendly manner.
3.5.2 Checking the delivery
Contact your supplier immediately in case of dam-
age or an incomplete delivery. The delivery must
include:
• ComfoAir 350 Luxe;
Check the identification plate to ensure that it
is the required type.
• 4 x 45Oconnection bends;
• Mounting bracket;
• Manual.
The ComfoAir is supplied in the following types:
Type
ComfoAir 350 L
ComfoAir 350 R
Type
ComfoAir 350 L RF
ComfoAir 350 R RF
Meaning of the suffixes:
• L = Left.
• R = Right.
• RF = wireless 3-position switch.
3.6 Wall mounting
Mount the ComfoAir against a wall with a minimum
mass of 200 kg/m2.
For other types of wall, we recommend using the
Zehnder mounting frame on the floor (available as
an optional extra). This reduces contact noise as
much as possible.
• Fasten the mounting bracket (included) to the
wall. Make sure it is level.
• Mount the condensation drain (not supplied)
under the ComfoAir. The stated dimension of
235 mm is an indication only, and is dependent
on the type of condensation drain selected.
• Make sure to leave a minimum space of 1 metre
in front of the ComfoAir in view of the necessary
maintenance work.

3
15System functions
The ComfoAir does not require any space at the
sides for effective operation.
Do not mount the side of the ComfoAir against
the wall due to the risk of impact sound.
3.6.1 Connection of the air ducts
Install a silencer directly onto the supply and return
connections. For relevant advice, please contact
Zehnder.
Subsequently, the air ducts to be connected, with a
minimum ø of 150 mm, must be installed with as lit-
tle air resistance as possible and must be free from
air leakage.
• Do not use flexible ducting and leave room for
mounting silencers.
• Insulate the outside air supply and the air ex-
haust duct between the roof/wall passage to
render the ComfoAir damp proof. This prevents
the formation of condensation on the outside of
the ducts.
• Install the air exhaust duct so it drains in the
direction of the ComfoAir.
Outside air
Exhaust air
Supply air
Return air
Return air
Supply air
Exhaust air
Outside air
3.6.2 Connection of the condensation drain
ComfoAir 350 - LEFT
ComfoAir 350 - RIGHT
Warm exhaust air is cooled by the outside air in the
heat exchanger. This causes the moisture in the
indoor air to condense in the heat exchanger. The
condensation water created in the heat exchanger
is fed to a PVC condensation drain.
The connection for the condensation drain has an
external diameter of 32 mm. It is located under-
neath the ComfoAir.
• Connect the condensation drain, via a pipe or
hose, to the water seal of the domestic waste-
water system.
• Position the upper edge of the water seal at
least 40 mm underneath the condensation drain
of the ComfoAir.
• Make sure that the outer end of the pipe or tube
exits below the water level.
Ensure that the water seal connected to the
domestic waste-water system is always full
of water.
Also ensure that the end of the hose is at
least 60 mm under the level of the water. This
prevents the ComfoAir from sucking in any
leakage air.

3
16 System functions
3.7 Commissioning the ComfoAir
After installation, the ComfoAir must be commis-
sioned.
This can be done via the P menus on the digital op-
erating device. These P menus can be used to enter
various settings (ventilation programmes, in partic-
ular) for the ComfoAir. An overview of the available
P menus is given below:
Menu Options
P1 Reading statuses (from menu P2)
P2 Setting time delays
P3 Setting the ventilation levels
P4 Reading the temperatures
P5 Setting additional programmes
P6 Setting additional programmes
P7 Reading and resetting malfunctions
(and system information)
P8 Setting 0-10V inputs
P9 Reading statuses (from menu P5)
P menus P1, P2 and P9 can be accessed by the
user, mainly to read statuses and set time delays.
The remaining P menus P3 to P8 are intended sole-
ly for the installer.
The ComfoAir's bypass valve will not work
for the first 4 minutes after a power cut un-
less the programme mode is activated.
3.7.1 Display on the unit
select menu up
OK down
supply off supply on
(led green) (led green)
comfort temperature
Shown in display
Ventilation setting absent
Ventilation setting low
Ventilation setting medium
Ventilation setting high
Menu symbol
Malfunction code (flashes)
Bypass
Access to the menus
Se-
quence
Press Display Description
1 MENU P2 Time delay
2▲ + ▼
(3 seconds)
P3 Press the buttons simul-
taneously
3▲P4 Temperatures
4▲P5 Settings
5▲P6 Settings
6▲P7 Malfunction / Reset /
Self-test
7▲P8 0 - 10V Inputs
8▲P9 Status
Example
Setting the MEDIUM POSITION
of the supply fan to 40%.
Se-
quence
Press Display Description
1 MENU P2 Time delay
2▲ + ▼
(3 seconds) P3 Press the buttons simul- taneously
3OK P30 Exhaust fan
Position A
4▲ (6x) P36 Select P36
5OK 50 Current setting
6
▼ (10 x or
press con-
tinuously)
40 Select 40
7 OK P35 Value is 40
8 MENU P3
9 MENU 1 Fan setting
MENU
A
OK
2
3
X X
X X
1
•