Zehnder Rittling ComfoAir 350 User guide

ComfoAir 350
Installer manual
Cooling Fresh Air Clean AirHeating

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.

3 - EN
Table of Contents
Preface 1
1 introduction .........................................................................................................................................1
1.1 Guarantee and liability..................................................................................................................... 1
1.1.1 Guarantee conditions.............................................................................................................................1
1.1.2Liability...................................................................................................................................................1
1.2 Safety
........................................................................................................................................... 2
1.2.1 Safety regulations ...............................................................................................................................2
1.2.2 Safety provisions and measures .........................................................................................................2
1.2.3 Pictograms used .................................................................................................................................2
2 For the installer...................................................................................................................................................3
2.1 ComfoAir configuration .................................................................................................................................3
2.2 Technical specifications ................................................................................................................................4
2.3 Dimension sketch ..........................................................................................................................................6
2.4 Installation conditions ...................................................................................................................................7
2.5 Installation of the ComfoAir ...........................................................................................................................7
2.5.1 Transport and unpacking ....................................................................................................................7
2.5.2 Checking the delivery..........................................................................................................................7
2.6 Mounting of the ComfoAir .............................................................................................................................7
2.6.1 Mounting on the wall...........................................................................................................................7
2.6.2 Connection of the air ducts.................................................................................................................8
2.6.3 Connection of the condensation drain ................................................................................................8
2.7 Commissioning the ComfoAir ........................................................................................................................9
2.7.1Display on the unit .................................................................................................................................9
2.7.2 P menus for the user......................................................................................................................... 10
2.7.3 P menus for the installer ...................................................................................................................12
2.8 Programming air specifications ...................................................................................................................15
2.9 Maintenance by the installer........................................................................................................................16
2.9.1 Inspecting and cleaning the heat exchanger.....................................................................................16
2.9.2 Inspecting and cleaning the fans ...................................................................................................... 17
2.9.3 Inspecting and cleaning the preheater element filter......................................................................... 17
2.10 Malfunctions................................................................................................................................................18
2.10.1 Malfunction alerts on digital operating devices.................................................................................18
2.10.2 3-position switches with malfunction indicator .................................................................................18
2.10.3 What to do in the event of a malfunction / Trouble shooting ............................................................. 19
2.10.4 Malfunctions (or problems) without alarms ......................................................................................25
2.11 Service parts ...............................................................................................................................................26
2.12 Wiring diagram: ComfoAir 350 Basic – LEFT-HAND version........................................................................27
2.13 Wiring diagram: ComfoAir 350 Basic – RIGHT-HAND version .....................................................................28
2.14 EEC declaration of conformity ....................................................................................................................29

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5 - 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 350 . 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 Introduction
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 has a CE marking on the identification
plate. The identification plate can be found on top
of the ComfoAir.
1.1 Warranty and liability
1.1.1 Guarantee conditions
The ComfoAir 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 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.
1.1.2 Liability
The ComfoAir 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 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.

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1.2 Safety
1.2.1Safety 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.
■The ComfoAir may only be installed, connected,
rendered operational and maintained by an
appropriately approved installer, unless otherwise
indicated in this manual;
■Installation of the ComfoAir 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;
■Observe the safety regulations, warnings,
comments 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 only suitable for connetion to
230V 50Hz mains;
■It is recommended to take out a maintenance
contract so that the device is checked on a regular
Basic. The supplier can provide a list of registered
installers nearby.
1.2.2 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.
1.2.3 Pictograms used
The following pictograms are used in this manual:
Point of attention.
Risk of:
- damage to the device;
- performance of the device is compromised if
instructions are not observed carefully.
Risk of personal injury to the user or installer.

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2 For the Installer
2.1 ComfoAir configuration
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 plate filters (D) for air purification. Filter classification: outside air G4, return air G4;
■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 (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.

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2.2 Technical specifications
ComfoAir 350 nL (normal air volumes)
Position Ventilation capacity Power
Low Setting 100 m3/h at 20 Pa 21 W
Medium Setting 150 m3/h at 65 Pa 44 W
High Setting 225 m3/h at 150 Pa 105 W
Maximum 325 m3/h at 235 Pa 243 W
Position Ventilation capacity Current
Low Setting 100 m3/h at 20 Pa 0.17 A
Medium Setting 150 m3/h at 65 Pa 0.35 A
High Setting 225 m3/h at 150 Pa 0.81 A
Maximum 325 m3/h at 235 Pa 1.77 A
Electricity
Power supply 230/50 V/Hz
Cos.phi 0,50 - 0,60
Connecting Power 1,59 kW
Maximum Power Pre-heater 1,35 kW
Leakage current <1mA
Supply fan noise level (at 0 m)
Position Ventilation capacity Sound power
Low Setting 100 m3/h at 20 Pa 49 dB(A)
Medium Setting 150 m3/h at 65 Pa 59 dB(A)
High Setting 225 m3/h at 150 Pa 70 dB(A)
Maximum 325 m3/h at 235 Pa 75 dB(A)
Exhaust fan noise level (at 0 m)
Position Ventilation capacity Sound power
Low Setting 100 m3/h at 20 Pa 43 dB(A)
Medium Setting 150 m3/h at 65 Pa 48 dB(A)
High Setting 225 m3/h at 150 Pa 55 dB(A)
Maximum 325 m3/h at 235 Pa 61 dB(A)

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ComfoAir 350 HL (high air volumes)
Position Ventilation capacity Power
Low Setting 125 m3/h at 25 Pa 27 W
Medium Setting 225 m3/h at 150 Pa 105 W
High Setting 300 m3/h at 230 Pa 196 W
Maximum 325 m3/h at 235 Pa 243 W
Position Ventilation capacity Current
Low Setting 125 m3/h at 25 Pa 0.21 A
Medium Setting 225 m3/h at 150 Pa 0.81 A
High Setting 300 m3/h at 230 Pa 1.42 A
Maximum 325 m3/h at 235 Pa 1.77 A
Electricity
Power supply 230/50 V/Hz
Cos.phi 0,50 - 0,60
Connecting Power 1,59 kW
Maximum Power Pre-heater 1,35 kW
Leakage current <1mA
Supply fan noise level (at 0 m)
Position Ventilation capacity Sound power
Low Setting 125 m3/h at 25 Pa 54 dB(A)
Medium Setting 225 m3/h at 150 Pa 67 dB(A)
High Setting 300 m3/h at 230 Pa 73 dB(A)
Maximum 325 m3/h at 235 Pa 75 dB(A)
Exhaust fan noise level (at 0 m)
Position Ventilation capacity Sound power
Low Setting 125 m3/h at 25 Pa 45 dB(A)
Medium Setting 225 m3/h at 150 Pa 55 dB(A)
High Setting 300 m3/h at 230 Pa 59 dB(A)
Maximum 325 m3/h at 235 Pa 61 dB(A)
General Specifications
HE Exchanger Material Polystyrene
Interior Material (E)PP / PA / PC
Thermal Yield 95%
Mass 39 kg

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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)