Zehnder Rittling ComfoAir Standard 300 User guide

1 - EN
ComfoAir Standard 300
ComfoAir Standard 375
Installer manual
Manuale installatore
Installationsanleitung
■Decorative radiators ■Comfortable indoor ventilation ■Heating and cooling ceiling systems ■Clean air solutions

EN - 2
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. In case of disputes the Dutch version of these instructions will
be binding.
Table of Contents
Preface ..................................................................................................................................................................3
1 Introduction ............................................................................................................................................................3
1.1 CE certification and warranty ...........................................................................................................................3
1.1.1 Guarantee conditions ............................................................................................................................3
1.1.2 Li ab ili t y .................................................................................................................................................3
1.2 Safet y .............................................................................................................................................................4
1.2.1 Safety regulations..................................................................................................................................4
1.2.2 Safety provisions and measures.............................................................................................................4
2 For the Installer .......................................................................................................................................................5
2.1 ComfoAir Standard configuration ......................................................................................................................5
2.2 Technical specifications ...................................................................................................................................6
2.3 Dimension sketch ............................................................................................................................................8
2.4 Installation conditions.......................................................................................................................................8
2.5 Installation of the ComfoAir Standard ................................................................................................................9
2.5.1 Transport and unpacking .......................................................................................................................9
2.5.2 Checking the delivery............................................................................................................................9
2.6 Mounting of the ComfoAir Standard ..................................................................................................................9
2.6.1 Mounting on the wall .............................................................................................................................9
2.6.2 Connection of the air ducts.................................................................................................................. 10
2.6.3 Connection of the condensation drain .................................................................................................10
2.7 Commissioning the ComfoAir Standard........................................................................................................... 11
2.7.1 Display on the unit............................................................................................................................... 11
2.7.2 P menus for the user ........................................................................................................................... 12
2.7.3 P menus for the installer ...................................................................................................................... 13
2.8 Programming air specifications ....................................................................................................................... 16
2.9 Maintenance by the installer ........................................................................................................................... 17
2.9.1 Inspecting and cleaning the heat exchanger.......................................................................................... 17
2.9.2 Inspecting and cleaning the fans .......................................................................................................... 18
2.9.3 Inspecting and cleaning the preheater element filter............................................................................... 18
2.10 Malfunctions ................................................................................................................................................. 19
2.10.1 Malfunction alerts on the digital operating device................................................................................... 19
2.10.2 3-position switch with malfunction indicators......................................................................................... 19
2.10.3 What to do in the event of a malfunction / Trouble shooting....................................................................20
2.10.4 Malfunctions (or problems) without alerts ..............................................................................................26
2.11 Service parts ................................................................................................................................................27
2.12 Wiring diagram: ComfoAir Standard - LEFT-HAND version ................................................................................28
2.13 Wiring diagram: ComfoAir Standard - RIGHT-HAND version ..............................................................................29

3 - EN
Preface
Carefully read this manual before use.
This manual provides all the information required
for safe and optimal installation and maintenance of
the ComfoAir Standard 300/ComfoAir Standard 375.
It is also intended as a reference for servicing, so
that this can be carried out in a responsible manner.
The unit is subject to continuous development and
improvement. As a result, the ComfoAir Standard
300/ComfoAir Standard 375 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.
The following pictograms are used in this
document:
Symbol Bedeutung
Point of attention.
Risk of compromised performance or
damage to the ventilation system.
Risk of personal injury.
1 Introduction
The name of the unit is ComfoAir Standard 300/
ComfoAir Standard 375. In this document it will be
referred to as ComfoAir Standard.
The ComfoAir Standard is a balanced ventilation
system with heat recovery in order to create healthy,
balanced and energy-efficient ventilation in houses.
The ComfoAir Standard has a CE marking on the
identification plate. The identification plate can be
found on top of the ComfoAir Standard.
1.1 CE certification and warranty
1.1.1 Guarantee conditions
The ComfoAir Standard 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 ComfoAir Standard 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 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.
1.1.2 Lia bilit y
The ComfoAir Standard has been designed and
manufactured for use in “balanced ventilation
systems”. Any other use is deemed unintended use
and can lead to damage to the ComfoAir Standard
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 manual.
■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.
Zehnder Group Nederland B.V.
Lingenstraat 2 • 8028 PM Zwolle-NL • Tel.: [phone]
Handelsregister Zwolle 05022293

EN - 4
1.2 Safet y
1.2.1 Safety regulations
Always comply with safety regulations
in this manual. Non-compliance with
the safety regulations, warnings, notes
and instructions in this manual can
cause personal injury or damage to the
ComfoAir Standard.
■The ComfoAir Standard may only
be installed, connected, rendered
operational and maintained by an
appropriately approved installer,
unless otherwise indicated in this
manual;
■Installation of the ComfoAir Standard
must be carried out in accordance
with the general and locally applicable
construction, safety and installation
instructions of the local council,
electricity and water boards or other
agencies;
■Always install the equipment
according to the latest regulations for
installation of your country.
■The entire installation must comply
with the applicable (safety) regulations
as stated in:
- local EU Standard on safety
provisions for low-voltage
installations;
- Manufacturer‘s assembly/installation
manual.
■Always obey the safety regulations,
warnings, comments and instructions
as prescribed in this manual at all
times;
■Keep this manual with the ComfoAir
Standard 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 Standard is
not allowed;
■The ComfoAir Standard is only
suitable for connection to 230V 50Hz
mains;
■It is recommended to take out a
maintenance contract so that the
unit is checked on a regular basis.
The supplier can provide a list of
registered installers nearby.
1.2.2 Safety provisions and measures
■The ComfoAir Standard cannot be
opened without using tools;
■It should not be possible to touch
the fans, therefore ducting must be
connected to the ComfoAir Standard
at a minimum duct length of 900mm.

5 - EN
2 For the Installer
2.1 ComfoAir Standard configuration
The standard ComfoAir Standard 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 plate filters (D) for air purification. Filter classification: ISO Coarse/ ISO ePM1 (ISO 16890 compliant);
■2 energy-efficient DC motors (E) with high-efficient fan;
■HE (High efficient) heat exchanger (F);
■Control circuit board (H1) with connections for the fans, the bypass, the Preheater element, temperature sensors
(T1 to T4), the 3-position switch with or without malfunction indicator (optional) and the bathroom switch
(optional);
■Identification plate (I) detailing information on the ComfoAir Standard (not visible);
■Condensation drain (J) to drain the condensation of the warm return air;
■Sticker (K) detailing the air connections (not visible);
■Cable for power supply with 230V 5 core connection (L);
■Display (M) to read data, and for programming procedures.
CC
CC
D
D
M
A
J
E
H
F
B
E
L K I

EN - 6
2.2 Technical specifications
ComfoAir Standard 300 ComfoAir Standard 375 ComfoAir Standard 375 ERV
Performance (EN 13141-7)
Maximum declared airflow (qvd) 300 m3/h 375 m3/h 422 m3/h
Thermal Efficiency (humidity) (0,7 x qvd)87% 86% 74% (60%)
Specific fan power 0,20 W/(m³/h) 0,23 W/(m³/h) 0,27 W/(m³/h)
Power consumption (qvd)93,2 W 142,3 W 202 W
Connection data
Shape air connection Round Round Round
Dimension air connection Inner: 160 mm (151 mm)
Outer: 180 mm
Inner: 160 mm (151 mm)
Outer: 180 mm
Inner: 160 mm (151 mm)
Outer: 180 mm
Dimensions syphon 32 mm / 1 ¼" 32 mm / 1 ¼" 32 mm / 1 ¼"
Connection syphon Tube / thread connection Tube / thread connection Tube / thread connection
Electrical data
Maximal power consumption 230 V ±10%, 1 fase, 50 Hz 230 V ±10%, 1 fase, 50 Hz 230 V ±10%, 1 fase, 50 Hz
Can be used with current (A) 10 10 10
Material specifications
Housing Coated sheet steel and ABS Coated sheet steel and ABS Coated sheet steel and ABS
Inside EPP and ABS EPP and ABS EPP and ABS
Heat exchanger Polystyreen Polystyreen n.a.
Enthalpy exchanger n.a. n.a. Polyethyleen-polyether-
copolymeer
General
IP-classification IP40 IP40 IP40
ISO-classification BBB
Weight 42 kg 42 kg 42 kg
Filter class ISO Coarse / ISO ePM1 ISO Coarse / ISO ePM1 ISO Coarse / ISO ePM1

7 - EN
Point
[-]
Instel.
[%]
Qv
[m³/h]
P
[Pa]
I
[A]
Pe
[W]
cos phi
[-]
Supply
dB(A)
Extract
dB(A)
Casing
dB(A)
130 125 13 0,15 16 0,43 49 35 34
234 125 32 0,18 19 0,44 52 39 37
340 125 61 0,21 24 0,46 54 41 40
446 210 29 0,33 39 0,51 59 45 44
549 210 50 0,38 45 0,5 60 46 45
653 200 92 0,41 49 0,52 61 48 47
756 185 131 0,45 55 0,52 64 54 49
857 263 50 0,52 64 0,53 63 53 48
964 290 60 0,65 81 0,54 66 52 51
10 69 260 151 0,76 95 0,54 68 52 53
11 74 240 229 0,85 108 0,54 69 56 55
12* 83 375 100 1,22 156 0,55 70 58 58
13* 91 340 258 1,53 196 0,55 73 58 59
14* 95 300 351 1,53 197 0,55 74 59 61
- * Only for the ComfoAir Standard 375
- Sound power reference level is 1pW.
- Sound pressure reference level is 20 μPa.
- Sound power levels measured according to ISO 3741:2010.
- Extract noise measured according ISO 5135:1997 (L w values include end reflection correction (therefore, values
are in duct values)).
- Supply noise measured according ISO 5135:1997 (L w values include end reflection correction (therefore, values
are in duct values)).
- cos phi with preheater turned off (if present)

EN - 8
2.3 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
CONDENSA
TION DRAIN
RIGHT-HAND VERSION
CONDENSATION DRAIN ø32 (OUTSIDE)
2.4 Installation conditions
In order to determine whether the ComfoAir Standard
can be installed in a certain area, the following
aspects must be taken into account:
■The ComfoAir Standard must be installed
according to the general and locally applicable
safety and installation regulations of power and
water companies, as well as the instructions in
this manual.
■The system must be fitted to allow sufficient
room around the ComfoAir Standard for the air
connections and supply and exhaust ducts as well
as for carrying out maintenance activities.
■The ComfoAir Standard 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 do not recommend installing the
ComfoAir Standard in areas with a higher
average humidity (such as bathroom or
toilet). This will prevent condensation on the
outside of the ComfoAir Standard.
■The room must offer the following provisions:
- Air duct connections.
- 230V electrical connection.
- Provisions for the condensation drain.
- Wiring for an wired 3-position switch (optional).
■Within a distance of 1 meter or at most the length
of the fixed (or supplied) power cable (both 3-core
and 5-core), an earthed wall outlet must be
available.
■A gap should be left near the doors in order to
ensure effective and draughtfree airflow in the
house. A gap under the inside doors must be at
least 10mm.
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
altogether.

9 - EN
2.5 Installation of the ComfoAir Standard
2.5.1 Transport and unpacking
Take the necessary precautions when transporting
and unpacking the ComfoAir Standard.
Make sure the packing material is disposed of in
an environmentally friendly manner.
2.5.2 Checking the delivery
Contact your supplier immediately in case of damage
or an incomplete delivery. The delivery must include:
■ComfoAir Standard;
Check the identification plate to ensure that it is
the required type.
■4 x 45O connection bends;
■Mounting bracket;
■Documentation.
The ComfoAir Standard is supplied in the following types:
Type
ComfoAir Standard 300 L
ComfoAir Standard 300 R
ComfoAir Standard 300 L PRH
ComfoAir Standard 300 R PRH
ComfoAir Standard 375 L
ComfoAir Standard 375 R
ComfoAir Standard 375 L PRH
ComfoAir Standard 375 R PRH
ComfoAir Standard 375 ERV L
ComfoAir Standard 375 ERV R
ComfoAir Standard 375 ERV L PRH
ComfoAir Standard 375 ERV R PRH
Meaning of the suffixes:
* L = Left version
* R = Right version
* PRH = Contains a preheater element by default
2.6 Mounting of the ComfoAir Standard
2.6.1 Mounting on the wall
Mount the ComfoAir Standard 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. The
ComfoAir Standard does not require any space at
the sides for effective operation.
Do not mount the side of the ComfoAir Standard
against the wall due to the risk of impact sound.
1. Fasten the mounting bracket to the wall. Make
sure it is level and at least 878mm from the floor
(depending on the type of condensation drain
selected).
Leave a minimum space of 1m in front of the
ComfoAir Standard for carrying out maintenance.
2. Hang the ComfoAir Standard on the mounting
bracket.
3. Mount the condensation drain under the ComfoAir
Standard. The stated dimension of 235 mm is an
indication only, and is dependent on the type of
condensation drain selected.

EN - 10
2.6.2 Connection of the air ducts
The following aspects must be taken into account,
while installing the air ducts:
■Install the air exhaust duct so it drains in the
direction of the ComfoAir Standard.
■Insulate the outside air supply and the air exhaust
duct between the roof/wall passage to render the
ComfoAir Standard damp proof. This prevents the
formation of condensation on the outside of the
ducts.
■To prevent unnecessary temperature loss in either
the summer or the winter, we recommend fitting
thermal and damp-proof insulation to the supply
ducts from the ComfoAir Standard up to the supply
valves.
■Install the air ducts with a minimum ø of 150 mm,
as little air resistance as possible and free from air
leakage.
■Install a silencer (preferably 1 meter straight)
directly onto the supply and return airconnections.
For relevant advice, please contact Zehnder.
■When using flexible channels only Zehnder
channel
systems may be used. Any other flexible channel will
disturb the basic operating principle of the balanced
ventilation system.
■ We recommend that the ventilation system is fitted
with intake and exhaust valves made by Zehnder.
Outside air
Exhaust air
Supply air
Return air
ComfoAir Standard - LEFT
Return air
Supply air
Exhaust air
Outside air
ComfoAir Standard - RIGHT
2.6.3 Connection of the condensation drain
ComfoAir Standard - LEFT
ComfoAir Standard - RIGHT
Standard heat exchanger
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 underneath
the ComfoAir Standard.
■Connect the condensation drain, via a pipe or hose,
to the water seal (siphon) 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 Standard.
■Make sure that the outer end of the pipe or tube
exits is at least 60mm below the water level.
Ensure that the water seal connected to the
domestic waste-water system is always full of
water. This prevents the ComfoAir Standard from
sucking in any leakage air.

11 - EN
Enthalpy exchanger
When the ComfoAir Standard is fitted with an
enthalpy exchanger the humidity from the extracted
air is partly transferred to the fresh supply air. In this
case you delay the process of drying out the house in
dry winter months, additionally there is no condensate
that must be drained from the ComfoAir Standard.
Therefore a condensation drain is not necessary with
an enthalpy exchanger.
Ensure that the condensation drain is sealed. This
prevents the ComfoAir Standard from sucking in
any leakage air.
The condensation drain can be sealed with a
standard screw-cap.
2.7 Commissioning the ComfoAir Standard
After installation, the ComfoAir Standard must be
commissioned.
This can be done via the P menus on the digital
operating device. These P menus can be used to
enter various settings (ventilation programmes, in
particular) for the ComfoAir Standard. An overview of
the available P menus is given below:
Menu Options
P1 Reading statuses (from menu P2)
P2 Setting time delays
P3 Setting and reading the ventilation levels
P4 Setting and reading the temperatures
P5 Setting additional programmes
P6 Setting additional programmes
P7 Reading and resetting malfunctions (and system
information)
P8 Setting the RF input and analogue inputs (0-10V)
P9 Reading statuses (from menu P5 and P6)
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 solely for
the installer.
The bypass valve will not work for the first 4
minutes after a power cut unless the programme
mode is activated.
2.7.1 Display on the unit
The ComfoAir Standard can be operated and
commissioned by means of a display. The display is
a digital operating device which is mounted on the
ComfoAir Standard.
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
Sequence Press Display Description
1MENU P2 Time delay
2s + s
(3 seconds)
P3 Press the buttons
simultaneously.
3 s P4 Temperatures
4 s P5 Settings
5 s P6 Settings
6 s P7 Malfunction / Reset /
Self-test
7 s P8 0 - 10V Inputs
8 s P9 Status
Example
Setting the MEDIUM POSITION of the supply fan to 40%.
Sequence Press Display Description
1MENU P2 Time delay
2s + s
(3 seconds)
P3 Press the buttons
simultaneously.
3OK P30 Exhaust fan
Position A
4s (6x) P36 Select P36
5OK 50 Current setting
6s (10 x
or press
continuously)
40 Select 40
7OK P35 Value is 40
8MENU P3
9MENU 1Fan setting
Some P menus (such as P1 and P9) can only be
read.
Leaving Reading menu
■At action point 6 press "MENU" (instead of "OK").
The display can not be used for setting the
ventilation positions of the ComfoAir Standard.
The arrowkeys are only for setting the additional
programmes.
OK
MENU
·
·
·
OK
MENU
·
·
·
OK
MENU
·
·
·
OK
MENU
·
·
·
OK
MENU
·
·
·
1
A
2
3
X X
X X
•
1
A
2
3
X X
X X
•
1
A
2
3
X X
X X
•
1
A
2
3
X X
X X
•
1
A
2
3
X X
X X
•
1
A
2
3
X X
X X
•
1
A
2
3
X X
X X
•

EN - 12
2.7.2 P menus for the user
Menu P1 ¨Status of programmes
Status
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 Minimum Maximum General
Reset
P21
(Optional)
Note:
Only applies to systems fitted with a
corded switch and a second switch in
the bathroom.
Delay timer for the bathroom switch (to switch to high
position).
■'x' minutes after operating the bathroom switch, the
ComfoAir Standard switches to the high setting.
- Low voltage input
0 Min. 15 Min. 0 Min.
P22
(Optional)
Note:
Only applies to systems fitted with a
corded switch and a second switch in
the bathroom.
Overrun timer for the bathroom switch (to switch to
normal position).
■'x' minutes after operating the bathroom switch,
the ComfoAir Standard switches back to the normal
setting.
- Low voltage input
0 Min. 120 Min. 30 Min.
P23
(Optional)
Note:
Only applies to systems fitted with a
hardwired 3-position switch.
Overrun timer for ventilation position 3 (using a wired
3-position switch).
■If ventilation setting 3 (high) is switched on briefly (<
3 sec), the ComfoAir Standard will switch to the high
setting for 'x' minutes and then automatically returns
to the normal setting.
If any 3-position switch is operated during this lagging
time the ComfoAir Standard will instantly revert to the
ventilation position as set at that time.
0 Min. 120 Min. 0 Min.
P24 Filter warning
■'x' weeks after cleaning the filters the "filter dirty"
alert will reappear.
10 weeks 26 weeks 16 weeks
P25
Note:
Only applies to systems fitted with an
RF switch.
Overrun timer for ventilation setting 3 (using " ").
■After pressing " " briefly (< 2 sec.), the ComfoAir
Standard will switch to the high setting for ‘x’ minutes
and then automatically returns to the normal setting.
If any 3-position switch is operated during this lagging
time the ComfoAir Standard will instantly revert to the
ventilation position as set at that time.
1 Min. 20 Min. 10 Min.
P26
Note:
Only applies to systems fitted with an
RF switch.
Overrun timer for ventilation setting 3 " using ".
■After pressing " " continuously (> 2 sec.), the
ComfoAir Standard will switch to the high setting
for ‘x’ minutes and then automatically returns to the
normal setting.
If any 3-position switch is operated during this lagging
time the ComfoAir Standard will instantly revert to the
ventilation position as set at that time.
1 Min. 120 Min. 30 Min.
P27 N/A 0 Min. 120 Min. 30 Min.
Menu P9 ¨Status of programmes (from menu P5 and P6 additional programmes)
Status
Sub-menu Description Activated
P90 Open fire programme active? Yes (1) / No (0)
P91 Bypass Open? Yes (1) / No (0)
P94 Analogue input (0-10V) active? Yes (1) / No (0)
P95 Frost protection or Preheater active? Yes (1) / No (0)
P97 Enthalpy programme active? Yes (1) / No (0)

13 - EN
2.7.3 P menus for the installer
Menus with a line at minimum and maximum value are Reading menus.
Menu P3 ¨Setting ventilation programmes
Ventilation programme values
Submenu Description Minimum Maximum General
Reset
P30 N/A 0% or 15% 97% nL / HL
15% / 15%
P31 Setting the capacity (in %) of the
exhaust fan in low position.
16% 98% nL / HL
35% / 40%
P32 Setting the capacity (in %) of the
exhaust fan in medium position.
17% 99% nL / HL
50% / 70%
P33 Setting the capacity (in %) of the
exhaust fan to high position.
18% 100% nL / HL
70% / 90%
P34 N/A 0% or 15% 97% nL / HL
15% / 15%
P35 Setting the capacity (in %) of the
supply fan in low position.
16% 98% nL / HL
35% / 40%
P36 Setting the capacity (in %) of the
supply fan in medium position.
17% 99% nL / HL
50% / 70%
P37 Setting the capacity (in %) of the
supply fan in high position.
18% 100% nL / HL
70% / 90%
P38 Current capacity (in %) of the
exhaust fan.
- - Current %
P39 Current capacity (in %) of the
supply fan.
- - Current %
Menu P4 ¨Reading the temperatures
Temperature values
Submenu Description Minimum Maximum General
Reset
P41 Comfort temperature 12 oC28 oC20 oC
P45 Current value of T1
(= outside air temperature)
- - Current oC
P46 Current value of T2
(= supply air temperature)
- - Current oC
P47 Current value of T3
(= return air temperature)
- - Current oC
P48 Current value of T4
(= exhaust air temperature)
- - Current oC

EN - 14
Menu P5 ¨Setting additional programmes
Additional programme values
Submenu Description Minimum Maximum General
Reset
P50 Activation of the open fire programme. 0 (= No) 1 (= Yes) 0
P51 Confirming the presence of
a Preheater element
0 (= No) 1 (= Yes) 0
Only change if a preheater element is installed afterwards or a general reset is given.
P52 Setting the Preheater programme.
■0; Guaranteed protection.
■1; High protection.
■2; Nominal protection.
■3; Economy.
0 3 2
In guaranteed protection mode the Preheater element is switched on soonest; this level offers the best
guarantee of balanced ventilation. Vice versa, in economy mode the Preheater element switches on at the last
possible moment; balanced ventilation is not guaranteed in this mode.
When commissioning the ComfoAir Standard, the Preheater programme can usually be left at level 2: no m i n a l m o d e (factory
setting). In areas with frequent cold spells in winter (frequent periods of -10°C or lower), level 1 should be selected: high
pr otection or even level 0: gua r antee d protec t ion.
P54 Confirming the presence of a bypass. 0 (= No) 1 (= Yes) 1
The standard ComfoAir Standard configuration includes a bypass. Therefore, leave the value at ‘1’.
P56 Setting the required air volume in the house.
■nL: ”normal air volume”.
■HL: "high air volume".
nL HL HL
Setting the air volume is the starting point for programming the air specifications and setting the fans.
P57 Setting the ComfoAir Standard type.
■Li = ”Left-hand version”.
■Re = ”Right-hand version”.
Li Re Li
With delivery the ComfoAir Standard is correctly pre-programmed at the factory.
After an general reset the pre-programming is lost and the setting must be reset.
The right setting is mentioned on the identification plate on top of the ComfoAir Standard.
P58 n/a 0 1 0
P59 Confirming the presence of an enthalpy exchanger.
■0; Enthalpy exchanger not fitted
■1; Enthalpy exchanger with RH sensor.
■2; Enthalpy exchanger without RH sensor.
0 (= No) 2 (= Yes) 0
Only an enthalpy exchanger without RH sensor can be fitted.
Menu P6 ¨Setting additional programmes
Additional programme values
Submenu Description Minimum Maximum General
Reset
P60 Confirming the presence of a geothermal heat exchanger.
■0; Geothermal heat exchanger not fitted
■1; Geothermal heat exchanger fitted
■3; Geothermal heat exchanger unregulated.
0 (= No) 3 (= Yes) 0
Only an unregulated geothermal heat exchanger can be fitted.

15 - EN
Menu P7 ¨Reading malfunctions (and system information)
(Malfunction) information values
Submenu Description Minimum Maximum General
Reset
P70 Current software version. Version number of the software (without “v”)
P71 Most recent malfunction. Code in accordance with alarm and malfunction alert
P72 Malfunction before the most recent one Code in accordance with alarm and malfunction alert
P73 Malfunction before the most recent two Code in accordance with alarm and malfunction alert
P74 Resseting malfunction(s)
■Set value tot '1' and press "OK" on the display.
01
(= activate)
0
P75 General reset.
■Press "OK" on the display for at least 5 seconds to
carry out a general reset.
All original software settings are re-
stored following a general reset.
0 1
(= activate)
0
Note:
After a general reset, the ComfoAir Standard will ask you to reset the “nL / HL” (see P56) and “Li / Re” (see P57)
settings.
Following a general reset, all settings and programmes need to be checked and set to the right value.
P76 Self-testing the ComfoAir Standard 0 1
(= activate)
0
■The LED's on the display will start blinking.
■The ComfoAir Standard will run at maximum Rotation Per Minute (RPM).
■The bypass valve will open and close.
■The preheater valve will open and close after the bypass has closed (If a preheater element is fitted).
P77 Resetting filter dirty counter 0 1
(= activate)
0
Note:
This resets the counter that triggers a dirty filter alert on the ComfoAir Standard. This allows the filter to be replaced before
the dirty filter alert appears.
Menu P8 ¨Setting the RF input and digital inputs (0-10V)
Analogue input values
Submenu Description Minimum Maximum General Reset
850 RF input 1 0= not fitted 1= fitted 0 1 0
851 0= controlling 1= programming (RF input 1) 0 1 0
852 set point RF input 1
(programming)
0 100 50
853 min. setting RF input 1 0 99 0
854 max. setting RF input 1 0 100 100
855 0=positive RF input 1 1=negative setting RF input 1 0 1 0
856 Read-out RF input 0 100 -

EN - 16
The default settings of the ComfoAir Standard nL
are:
Position low 35%
Position medium 50%
Position high 70%
The default settings of the ComfoAir Standard HL
are:
Position low 40%
Position medium 70%
Position high 90%
Follow this procedure to programme the ComfoAir
Standard (after installation):
1. Set the ComfoAir Standard in programming mode.
- Display: Press simultaneously for at least 3
seconds on " " and " " until “InR” appears
on the display.
In programming mode, the bypass and Preheater
element valves are always closed. After 30
minutes, the ComfoAir Standard automatically
terminates the programming mode.
2. Close all windows and outside doors.
3. Close all inside doors.
4. Check the presence of structural overflow
provisions.
The structural overflow provisions must be at
least 12 cm2 per l/s.
5. Check if both fans function in the three speed
settings.
6. Switch the ComfoAir Standard to high speed.
7. Install all valves and set the valves according to
the settings given or as set in the reference house.
If no data are known:
– Install the valves and open them as far as
possible.
– Measure the air volumes; starting with the intake
air and then the exhaust air.
– If the measured air volumes deviate from the
nominal air volumes by more than +/-10%, and
the majority of the deviations is positive, ensure
that all deviations are positive. If the majority
of all deviations is negative, ensure that all
deviations are negative. Ensure that one supply
valve and one exhaust continue to be fully open.
8. Change the fan settings in P menus P30 to P37 of the
digital operating device.
– Select the lowest possible setting in order to
conserve energy.
– Ensure that the ratios between low, medium and
high remain equal.
Use the chart of the air specifications to set the
fans.
9. In the event that the currently set air volumes still
deviate too much: Adjust the valves.
10. Check the entire installation again, after all
valves have been set.
11. Switch the ComfoAir Standard (back) to
ventilation position 2.
- Display: Press simultaneously for 3 seconds on
2.8 Programming air specifications
After installation, the ComfoAir Standard must be programmed.
Zehnder ComfoAir Standard 300 and 375
Figure 3.0: Air graph ComfoAir Standard
49 dB(A)
59 dB(A)
66 dB(A)
70 dB(A)
52 dB(A)
61 dB(A)
68 dB(A)
73 dB(A)
54 dB(A)
64 dB(A)
69 dB(A)
74 dB(A)
0
50
100
150
200
250
300
350
400
0 50 100 150 200 250 300 350 400
Pressure [Pa]
Flow [m³/h]
In duct Sound Power Levels (A-weighted)
CA Standard 375/300 - Supply
R
R
R
This can be done using the air specifications of the ComfoAir Standard above.

17 - EN
"" and " "until “InR” disappears of the
display.
2.9 Maintenance by the installer
The following maintenance must be carry out by the
installer:
■Inspecting and (if necessary) cleaning the heat
exchanger;
■Inspecting and (if necessary) cleaning the fans;
■Inspecting and (if necessary) cleaning the
preheater element filter (If a preheater element is
fitted).
A concise explanation of these maintenance
activities is given in the paragraphs below.
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).
Check the condensation drain once every 2
years.
Failure to carry out (periodic) maintenance on
the ComfoAir Standard ultimately compromises
the performance of the ventilation system.
2.9.1 Inspecting and cleaning the heat
exchanger
Check the heat exchanger once every 2 years.
1. Disconnect the power (A) from the ComfoAir
Standard.
2. Remove the handles (B) from the ComfoAir
Standard.
3. Remove the filters from the ComfoAir Standard.
4. Release the front panel by unscrewing the screws
(C).
5. Slide the front panel upwards and remove the
front panel from the ComfoAir Standard.
C
B
A
6. Release the cover panel by unscrewing the screws
(D).
7. Remove the cover panel.
When reassembling the front cover, the lower
section must first be inserted behind the raised
edge to ensure a good seal.
D
ComfoAir Standard – Left-hand version
8. Pull the strap (E) to remove the heat exchanger
and the leakage tray (F).
9. Remove the bypass duct (G) in the left-hand
version of the ComfoAir Standard.
E
F
G
ComfoAir Standard – Right-hand version
8. Remove the bypass duct (G) in the right-hand
version of the ComfoAir Standard.
9. Pull the strap (E) to remove the heat exchanger and
the leakage tray (F).
E
F
G
10. Remove the heat exchanger from the leakage tray
(F).

EN - 18
The heat exchanger may contain some residual
water!
When reassembling the leakage tray the
openings in the leakage tray must be on the side
of the condensation drain.
11. Inspecting and if necessary clean the heat
exchanger.
- Use a soft brush to clean the lamellae.
- Use a vacuum cleaner or air gun (no high
pressure) to remove dirt and dust.
Always clean against the direction of the airflow.
This prevent dirt from getting stuck in the heat
exchanger.
Only standard exchanger with a green cover and
Enthalpy exchanger with a blue cover:
a. Submerge the heat exchanger several times in hot
water (max. 40 °C).
b. Rinse the heat exchanger with clean hot tap water
(max. 40 °C).
c. Clasp the heat exchanger between both hands (on
the coloured side surfaces) and shake the water
from the heat exchanger.
Only an enthalpy exchanger with a bleu cover can
be washed with water. When having an Enthalpy
exchanger with a white cover do never wash it
with water.
Do not use aggressive cleaning agents or
solvents.
If the fans or preheater element filter also need
maintenance do not re-install the heat exchanger
yet.
12. If no more maintenance is necessary install all
parts in reverse order, reconnect the power and
carry out the self-test in accordance with menu
P76.
Fasten the screws to a maximum of 1.5 Nm.
This is roughly equal to setting 2 of an average
battery-powered drill.
2.9.2 Inspecting and cleaning the fans
Check the fans once every 2 years.
1. Remove the heat exchanger as instructed in the
maintenance chapter of the heat exchanger.
2. Remove the small plastic panel (H) in front of the
control circuit board panel by unscrewing the two
screws.
3. Release the connectors (K) and the earth wire on the
control circuit board panel and fully remove the cables
including the two grommets (K).
4. Remove the entire scroll casing by pressing the
click fasteners (L).
5. Remove the inflow nozzle by pressing the click
fasteners surrounding the scroll casing.
6. Inspecting and if necessary clean the fans.
- Use a soft brush to clean the fan impellers.
- Use a vacuum cleaner to remove dust.
L
K
H
Do not damage the fan impellers or temperature
sensor.
If the preheater element filter also need
maintenance do not re-install the heat exchanger
yet.
7. If no more maintenance is necessary install all
parts in reverse order, reconnect the power and
carry out the self-test in accordance with menu
P76.
Fasten the screws to a maximum of 1.5 Nm. This is
roughly equal to setting 2 of an average battery-
powered drill.
2.9.3 Inspecting and cleaning the preheater
element filter
Clean the filter of the Preheater (if fitted) once
every 4 years.
1. Remove the heat exchanger as instructed in the
maintenance chapter of the heat exchanger.
2. Remove the small plastic panel (I) in front of the
control circuit board panel by unscrewing the two
screws.
3. Release the connectors (J) and the earth wire on
the control circuit board panel and fully remove
the cables including the two grommets (K).
4. Remove the cable (P) from the control circuit
board panel.

19 - EN
5. Remove the base (Q) of the Preheater element.
– The base is fitted in the electronic carriage with
four snap connections. Two snap connections
are located at the front (visible) and two at the
back (not visible).
6. Inspecting and if necessary clean the preheater
element filter.
- Clean the filter with a brush.
- Remove any deposit using a damp cloth.
7. Install all parts in reverse order.
8. Reconnect the power to the ComfoAir Standard.
Fasten the screws to a maximum of 1.5 Nm.
This is roughly equal to setting 2 of an average
battery-powered drill.
9. Carry out the self-test in accordance with menu
P76.
2.10 Malfunctions
Malfunctions in the ComfoAir Standard are reported
as follows:
■The malfunction alert appears on the display.
■The malfunction indicator on the 3-position switch
lights up;
Malfunction alerts may not appear on the digital
operating device in all cases, even though there is a
malfunction (or problem). A concise explanation of
both types of malfunction (or problem) is given in the
paragraphs below.
2.10.1 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 Standard.
Below is a list of the malfunction alerts on the digital
operating device.
In the chapter about trouble shooting is explained
how to solve these malfunctions
Code Description
A0 N/A
A1 NTC sensor T1 is defective.
(= outside air temperature)
A2 NTC sensor T2 is defective.
(= supply air temperature)
A3 NTC sensor T3 is defective.
( =return air temperature)
A4 NTC sensor T4 is defective.
(= exhaust air temperature)
A5 Malfunction in the bypass motor.
A6 Malfunction in the
Preheater element motor.
A7 Preheater element does not heat sufficiently.
A8 Preheater element becomes too hot
E1 Exhaust fan not rotating.
E2 Supply fan not rotating.
EA2 No communication between the enthalpy sensor
and the ComfoAir Standard.
,Fil' ,tEr' Internal Filter is dirty.
2.10.2 3-position switch with malfunction
indicators
The 3-position switches that are fitted with a
malfunction indicator show when a malfunction or
filter dirty alert has occurred. Depending on the type
of the 3-position switch, this is done in one of the
following two ways:
■3-position switch with malfunction indicator.
In the event of a malfunction or filter dirty alert the
indicator lights up;
■Wireless 3-position switch with malfunction
indicator.
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
malfunctionor filter dirty alert both indicators will
flash red 3 times. After that, both indicators will
light up green once more.

EN - 20
2.10.3 What to do in the event of a malfunction / Trouble shooting
Below are a number of trouble-shooting tips for the malfunction alerts described previously which can appear on
the digital operating device in the event of a malfunction.
A1 / A2 / A3 / A4
NTC sensor
T1 / T2 / T3 / T4
is defective
Remove the handles
from the ComfoAir.
Remove the filters from
the ComfoAir.
Slide the front panel
upwards and remove
the front panel from
the ComfoAir.
Release the cover panel
by unscrewing the
screws.
Remove the small
plastic panel in front
of the control circuit
board by unscrewing
the two screws.
Remove the cover
panel.
Reconnect the NTC
sensor.
Reconnect the
power to
the ComfoAir.
Yes No
Yes
No
Is the
resistance of
the NTC sensor
correct?
Replace the
NTC sensor.
Replace the
control circuit
board
.
Yes No
Was the
temperature
< -27ºC or
> 127ºC?
Reset the unit
(P74 on 1)
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Release the front panel
by unscrewing the
screws.
Are the
connections
at the ComfoAir
correct?
Resistance [KΩ]
MIN. MID. MAX.
10 19,.570 19,904 20,242
15 15,485 15,712 15,941
18 13,502 13,681 13,861
19 12,906 13,071 13,237
20 12,339 12,491 12,644
21 11,801 11,941 12,082
22 11,291 11,420 11,550
25 9,900 10,000 10,100
30 7,959 8,057 8,155
Temperature
[°C]
Resistance tabel for
(NTC) temperature sensors: