Zehnder Rittling ComfoClime 24 User guide

ComfoClime 24
ComfoClime 36
Installer Manual
Decorative radiators Comfortable indoor ventilation Heating and cooling ceiling 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.
Table of Contents
Preface............................................................................................................................3
1 Introduction................................................................................................................... 4
1.1 CE and UKCA declaration and warranty .............................................................................. 4
1.1.1 Identification plate ..................................................................................................... 4
1.1.2 War rant y .................................................................................................................. 5
1.1.3 Li abili t y..................................................................................................................... 5
1.2 Safety .............................................................................................................................. 5
1.2.1 Safety measures....................................................................................................... 6
2 For the Installer.............................................................................................................. 7
2.1 ComfoClime configuration and dimensions .......................................................................... 7
2.2 Technical specifications..................................................................................................... 8
2.3 Installation conditions ........................................................................................................ 9
2.4 Installation of the ComfoClime ...........................................................................................10
2.4.1 Transport and unpacking..........................................................................................10
2.4.2 Checking the delivery .............................................................................................10
2.5 Configuration of the unit ...................................................................................................12
2.6 Installation procedure .......................................................................................................12
2.6.1 Floor mounting ........................................................................................................12
2.6.2 Installation of air ducts .............................................................................................18
2.7 Wiring diagram ComfoClime..............................................................................................19
2.8 Commissioning the ComfoClime .......................................................................................20
2.9 Operation........................................................................................................................20
2.10 Maintenance - Service ....................................................................................................20
2.11 Troubleshooting ..............................................................................................................21
3 Error and alarm messages............................................................................................ 22
Zehnder Group International - Via G. di Vittorio 6 - 41011 Campogalliano (MO), Italy
T [phone] - F [phone]
To configure and operate the ComfoClime the user must install the ComfoClime Control
app by downloading it from Google Play or Apple Store.

3 - EN
Preface
IMPORTANT!
Carefully read this manual before use.
This manual provides all the information required for a safe and optimal installation and maintenance
of the ComfoClime 24 or ComfoClime 36. 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 ComfoClime 24 or ComfoClime 36 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 Meaning
Consult the manual before using/operate the equipment.
Point of attention / important informations.
Risk of compromised performance or damage to the ventilation system / risk of
personal injury.
Caution electrical hazard!

EN - 4
1 Introduction
The ComfoClime is a balanced ventilation system with passive energy recovery combined with a state
of the art reversible heat pump to provide active climatization in order to create healthy, balanced,
energy-efficient ventilation in houses.
1.1 CE and UKCA declaration and warranty
1.1.1 Identification plate
The ComfoClime has a CE and UKCA marking on the identification plate. The identification plate can
be found on the front of the ComfoClime.
CAUTION!
It is strictly prohibited to remove the identification plate and/or replace it with other plates.
Should the plate be damaged, detached or removed for accidental reasons, the customer
must inform the supplier.
Please write down the ComfoAir Q and ComfoClime serial numbers here:

5 - EN
1.1.2 Warrant y
The ComfoClime is covered by a manufacturer’s warranty for a period of 24 months after fitting,
and 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 ComfoClime must not be dismantled without written permission from the
manufacturer. Spare parts are only covered by warranty, if they were supplied by the manufacturer
and have been installed by an approved installer.
The warranty becomes invalid if:
■The warranty period has expired;
■The unit is used without the filters properly installed in the ComfoAir Q;
■There are parts that have not been supplied by the manufacturer;
■Non-authorised changes or modifications have been made to the unit.
CAUTION!
The supplier shall not be held liable for any damage, to things or people, caused by
accidents due to a failure to comply with the instructions provided in this manual and
in the following chapters.
1.1.3 L ia bilit y
The ComfoClime has been designed and manufactured for use in “balanced ventilation systems”. Any
other use is deemed as an unintended use and can lead to damage to the ComfoClime 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.
1.2 Safet y
Always comply with the safety regulations, warnings, comments and instructions
given in this document. Failure to comply with the safety regulations, instructions,
warnings and comments may lead to personal injury or damage to the unit.
■When using the Zehnder ComfoClime, all parts of the supply air system must be properly
insulated in order to prevent condensation in cooling season (risk of dew point reach) or
to avoid thermal losses in the heating season. The ComfoFresh air distribution system
with Thermal Shield® is suitable for this purpose.
■The air distribution system and the diffusers should be designed for a nominal air volume
of at least 200m3/h for the ComfoClime 24 and 315m3/h for the ComfoClime 36.

EN - 6
1.2.1 Safety measures
Always observe the local building, safety and installation guidelines of the municipality, utility
companies or other authorities.
Lift or move the unit according to the local safety regulations. The ComfoClime weighs
around 60kg.
The installation of the unit hanging on the wall is not permitted.
Always connect air ducts with a minimum length of 900 mm to the unit before connecting the
power supply to prevent contact with the internal components.
After installation, all parts that could lead to personal injury are safely out of reach behind
the casing.
It is not permitted to modify the unit or any of the specifications contained in this document.
This may result in personal injury or reduced ventilation system performance.
Installation, commissioning and maintenance must be carried out by a certified person or
company, unless stated otherwise. If this work is carried out by unauthorised persons, it may
result in personal injury or reduced performance of the ventilation system.
Always disconnect the power supply of the unit before you start working on it. The unit can
cause personal injury when it is opened during operation. Make sure the unit cannot be
switched back on by accident.
Always take ESD-inhibiting measures when dealing with electronics, such as wearing an
antistatic wristband. The electronics can be damaged by static charges.
In case of failure of the heat pump circuit please do not intervene, but please call the Zehnder
Service.
The unit contains R32 refrigerant gas. This is a low-flammable, non-toxic refrigerant. Handle
the unit with the utmost care during installation or maintenance activities to prevent refrigerant
from leaking. Anyone involved in maintenance, repair or recycling of the product should wear
gloves and eye protection all the time.
Operations over the refrigeration circuit is not allowed. In case of failure or leakages please
call the Zehnder Service for support.
If refrigerant leaks due to a defect or damage, then:
• Open windows and doors in the room in which the unit is located for at least one hour.
The unit contains 0.65kg (at room temperature approx. 0,6 m3) of R32 refrigerant gas.
The refrigerant is far heavier than air and it would concentrate on the floor and in case of
leakage never try to contain the escaped gas and do not breath it in.
In the event of contact with skin or eyes, rinse for at least 20 minutes with lukewarm water
and contact your doctor.
Product end of life: when disposing of the unit, contact your local authority to enquiry which
are the possibilities for recycling or processing. The unit contains R32 refrigerant gas. It is
mandatory that the refrigerant is disposed of in an environmental friendly manner: if not the
contribution to greenhouse gas emissions of the volume of gas in this unit equals to 438 kg
of CO2.
Flammable gas risk hazard!
Unit under pressure risk hazard!

7 - EN
2 For the Installer
2.1 ComfoClime configuration and dimensions
The standard ComfoClime configuration consists of:
■1 ComfoClime unit;
■1 cabled power supply plug;
■4 rubber ring gaskets;
■1 condensation drain cap;
■2 EPP standoffs;
■1 white plastic front cover;
■1 quick user guide;
■1 ComfoNet cable;
■1 kit for wall fastening (with screws);
■1 DN32 PP bend.
CC24 - Ø 175 mm (DN 160)
CC36 - Ø 215 mm (DN 200)
CC24 - Ø 175 mm (DN 160)
CC36 - Ø 215 mm (DN 200)
185 mm
655 mm
384 mm
720 mm
580 mm
condensation
drain Ø 32 mm
condensation
drain Ø 32 mm

EN - 8
2.2 Technical specifications
ComfoClime
ComfoClime 24 ComfoClime 36
Performance
Minimum airflow 200 m3/h 315 m3/h
Maximum airflow 400 m3/h 600 m3/h
Electrical connection details
Maximum electrical absorption 1100 W 1100 W
Power supply 230 V ± 10%, single
phase, 50 Hz
230 V ± 10%, single
phase, 50 Hz
Current draw 4.87 A 4.87 A
Fuse 16A, cat. C 16A, cat. C
Mechanical connection details
Dimensions of air ducts (Ø) 175 mm
(ComfoPipe Compact DN160)
215 mm
(ComfoPipe Compact DN200)
Diameter of condensation drain (Ø) 32 mm 32 mm
Material specifications
Casing Coated metal sheet Coated metal sheet
Internal structure Insulated metal sheet Insulated metal sheet
General
Temperature range during transport and
storage
+5°C to +50°C +5°C to +50°C
Temperature range intake air -15°C to +50°C -15°C to +50°C
Temperature range of installation area >10°C >10°C
Relative humidity of installation area <90% (non-condensing) <90% (non-condensing)
Front panel White plastic White plastic
Refrigerant gas (weight) R32 (650g) R32 (650g)
GWP-AR4 675 675
Maximum Pressure 38 bar 38 bar
Weight 60 kg 60 kg

9 - EN
2.3 Installation conditions
In case of retrofitting installation, it's recommended that the ComfoAir Q has the
latest firmware with a minimum of release 1.10 (see ComfoAir Q manual).
In order to determine whether the ComfoClime can be installed in a certain area, the following aspects
must be taken into account:
■The unit must be installed in a frost-free space;
■The ventilation unit must be mounted only on flat, stable floor.
CAUTION!
Fitting to a ventilation unit mounted onto the wall is NOT permitted for safety reasons.
■The roof vents should be made airtight and dampproof;
■All supply, outdoor and exhaust ducts should be dampproofed. This prevents
condensation forming on the inner or outer duct surface and improves air temperation
efficiency;
CAUTION!
DO NOT connect a powered extractor hood to this system.
■We recommend fitting the unit with silencers right after the unit, on both the supply and
extract ducts. For more information, please contact Zehnder;
■The installation location must be chosen so that there is sufficient room around the
unit for air duct connections, intake and exhaust piping and in order to carry out the
installation. Keep at least 1 metre free in front of the unit and 25 cm to the side where
the condensation drain is connected to the waste water;
■The free height when mounted should be at least 210 cm, in order to allow enough
space for the ducts connection;
■Connect the unit to a 230 V~ 50 Hz power supply. Any other connection would damage
the unit and is not permitted;
■The unit is designed for use in residential areas only. The unit is not suitable for
commercial use such as in swimming pools or saunas. Installation in an industrial
environment can damage the unit;
■The allowed temperature of the installation area is provided in the section “Technical
specifications”;
■Zehnder recommends that the unit is not installed in spaces with higher-than-average
humidity (such as laundry rooms or swimming pool environment). This prevents the
formation of condensation on the external surface of the unit;
■Check whether the electrical installation can fulfil the maximum capacity of the unit.
The maximum capacity is provided in the section “Technical specifications”;
■All units are suitable for a 230V ~ 50Hz single phase supply fused 16A cat. C.

EN - 10
2.4 Installation of the ComfoClime
2.4.1 Transport and unpacking
Contact your supplier immediately in case of damage or incomplete delivery and
do not proceed with the installation.
■Take the necessary precautions when transporting and unpacking the ComfoClime unit.
■Only transport it in an upright position.
■Keep it upright when unpacking it.
■Make sure the packing material is disposed of in an environmentally friendly manner.
2.4.2 Checking the delivery
■The ComfoClime unit (with its white front cover);
Check the identification plate to ensure that you have received the correct unit
type
■One plug for the unused condensation drain;

11 - EN
■2 EPP standoffs;
■4 rubber gaskets;
■Wall bracket;
■DN32 PP bend;
■Wiring group.

EN - 12
2.5 Configuration of the unit
Legend
ACRONYM MEANING
RRight layout
LLeft layout
ODA Outdoor air intake
SUP Indoor supply air
ETA Indoor air extraction
EHA Outdoor air exhaust
Consider the following schemes to connect the ducts:
R
ODA SUP
EHA ETA
ETA EHA
SUP ODA
L
2.6 Installation procedure
During the installation, please take into consideration electromagnetic interferences.
■Ensure that there is a barrier (e.g. separate duct or compartment) or minimum distance
of 150 mm between the interfering power cables (e.g. 230 V) and cables sensitive to
interference (e.g. testing, low voltage, interface, LAN, digital or analogue signal).
■Make sure interfering and sensitive cables cross each others perpendicularly.
■Ensure that the cables used for the controls meet the requirements specified in the
section “Technical specifications”.
These measures will limit the EMC disruptions as much as possible and ensure the best communication.
2.6.1 Floor mounting
CAUTION!
Do not connect the ComfoAir Q nor the ComfoClime to the power supply until the
end of the complete installation and the mutual connection of the units is done.
The unit must not be mounted/hung onto the wall.
For the anti-tilt plaque please use proper fastening screws accordingly to the type
of wall.
The installation position must be horizontal.

13 - EN
Before proceeding with the ComfoClime installation, write the serial number of
the ComfoAir Q, located below the grey upper lid, in the designated space of the
ComfoClime installer manual. This serial would be useful in case of future remote
access to the unit . Write down also the serial number of the ComfoClime for an easy
future necessity of it.
The ComfoClime must be placed on top of the ComfoAir Q according to the following steps:
Step Action
1Make sure that the ComfoAir Q is properly placed in its final position (see the ComfoAir Q
installation manual);
2
Put the two EPP standoffs on the top part
of ComfoAir Q as shown in the picture with
the metallic plates on the front;
3
Place the four rubber gaskets over the
spigot openings verifying the full insertion
of them. Check that the sealings are
creating an effective seal between the
spigot and the adapter plates;
4
Once carefully unpacked, remove the two
parts of the front pulling out the upper black
top A and unscrewing the four screws (two
on the top and two on the bottom) of the
white cover B;
A
B

EN - 14
Step Action
5
Unpack carefully the ComfoClime and place carefully the ComfoClime over the ComfoAir
Q respecting all the safety rules taking as reference the four pins on its bottom which
have to fit in with the corresponding recesses in the EPP standoffs;
WARNING!
Never lift the unit alone. It is heavy and must be mounted with accuracy
and carefully, being sure the gaskets do not dislodge while installing.
NOTE: during the placement of the ComfoClime on top of the ComfoAir Q,
remember to arrange the power supply cord so that it will exit from the back
of the unit.
6
Connect the free end of the provided ComfoNet cable to the ComfoAir Q connector
paying attention to make the cable going to the back of the unit and then coming back to
the front staying below the grey skid/lid of the ComfoAir Q as shown:
a. CAN_L: white
b. CAN_H: yellow
c. GND: black
C
D
To get access to the front ComfoAir Q connector, open the black panel of the ComfoAir Q
rotating it downwards and pull out the grey lid D;

15 - EN
Step Action
7
Verify that the blue central rotary switch is
in the proper position:
• 0 for ComfoClime 36
• 1 for ComfoClime 24
• 2 for ComfoClime Q
if necessary ensure it in the correct position
using a flat screw driver;
The ComfoClime can be reset in two different ways.
In both cases it is not necessary to unplug the ComfoClime.
The first "soft" reset is done by pressing the upper dip-switch named RESET once.
The second "hard" reset (factory reset) is done by first pressing the RESET button and,
while the RESET is pressed, pressing also the RESTORE button holding it pressed down
for 10 sec until the green LED on the right of the rotary switch starts blinking.
Now it is possible to release the RESTORE button. The soft reset is equivalent to turning off
the unit or unplug it. The factory reset brings back the unit to the factory default settings
meaning that every customisation will be lost, including the provisioning procedure. The
ComfoClime must be provisioned from scratch following the initial procedure illustrated at
the chapter 1.1 of the User manual.
See Step 9 to put back in place the black top cover, carefully, fastening it gently to the
four hooks.
8
Fix the anti tilt plate (on top of the
ComfoClime) firmly to the ComfoClime
using the screws included in the packaging.
Afterwards fix the ComfoClime to the wall
using a proper fastening system suitable
for the type of wall.

EN - 16
Step Action
9
Mount the plastic front cover Aonto the
unit. Check that the top of the plastic
design front is properly matching the
recesses and that it goes smoothly above
the CAQ front plastic cover. Then fix the
ComfoClime plastic front A with the two
provided screw on top and the two on the
bottom; mount the black top front cover
B pushing gently the four pins into the
housing.
B
A
10
Connect the preferred drain ending, placed on the lateral side to the water drain system
and plug the other up with the provided cap.
NOTE: do not install a dry siphon: the overpressure in the unit could open the
dry siphon guard and cause an air leakage.
Install only external wet siphon with a 100mm guard according to the local
regulations. The siphon can have an open funnel.

17 - EN
Step Action
11
Depending to the installation setting, the drainage system will be different as shown in the
following pictures:
Installation with CAQ HRV (standard exchanger) Installation with CAQ ERV (enthalpy exchanger)
* an open funnel might be required according to local regulations.
*
*

EN - 18
2.6.2 Installation of air ducts
CAUTION!
Do not connect the ComfoAir Q nor the ComfoClime to the power supply until the end
of the installation and the duct connection of the units are fitted. The unit must not be
mounted/hung onto the wall.
Always comply with the safety regulations, warnings, comments and instructions
given in this document and according to regulations within the local country. Failure
to comply with the safety regulations, instructions, warnings and comments may lead
to personal injury or damage to the unit.
Proceed with the installation of the air ducts according to the following steps:
Step Action
1Connect the supply/extract ductwork to the
four intakes on top of the ComfoClime;
2
Then proceed with the air distribution. In
brand new installations it is mandatory to
provide an insulated ductwork, installing
the pre-insulated Zehnder ComfoFresh
Thermal Shield system components.
The pre-insulated ductwork is strongly
suggested in existing installation as well
(retro fitting)

19 - EN
2.7 Wiring diagram ComfoClime
FS-1 Power supply lter 10A FS-2 Electric panel lter 10A
AB Air bypass
4W 4 way valve
RT Right coil probe
IPT Right air sensor probe
OT Left coil probe OPT Left air sensor probe
L-H Can-bus EEV Electronic expansion valve BA Airduino board
CM Compressor CP Compressor probe
ID Inductance
PB Power board DB Driver Board MM Main Mcu board BA Airduino board
PB
N
L
PE
N
L
PE
PEPE PEPE
FS-2
BN-
1
mmq
BL-
1mmq
BL-
1mmq
BN-
1mmq
DB
MM
P3 P3 Heater1
Valve
Drain Pump Heater2 P2 Heater1
Valve
Drain Pump Heater2
s
N.O
COM
ACL -IN
ACN -IN
VDC - VDC +
GND +15V
COM M-D r
CN3
FAN PO WER
CN10
COM -CO N
CN1
BRN
CN2
BLU CN4
PE PE PE
CN5
BLK
CN6
Nout
CN8
Lout
CN9
PE
RED
CN7
LAMIERA
QUADRO BASAMENTO
YE-GN-1mmq
YE-GN-1mmq YE-GN-1mmq
BL-1mmq BN-1mmq
MAGNETIC COIL
N276246A
RL1
CN1
RL2
CN2
RL3
CN3
RL4
CN4
RL5
CN5
ELEC .VALV E
CN8
N.C
COM
STEP MO TOR
CN10
CN13 CN13 CN13
Door Door Level
Alarm
Level
Alarm
CN16 CN17 CN18 CN12
V
U
W
COM P XP209
CON
XP101
RED
BLK
GRN
COIL
XP211
ENVI
XP212
N
P
L
ACL_INACN_IN
L
XP107
XP103
CN5
CN10CN14
CN7
DISP LAY
CN11
OUT FA N
CN9
DC IN FAN
CN7
FAN PO WER
CN6
+5V
SCK
DI0 GND RT
IPT
RT
IPT
OT OPT OT OPT TS TS
TX
RX
GND
+5V
+12V
FG
VSP
+15V
GND
+310 V
+15V
IF-PMW IF-FG
+310V GND
+15V GND GND +310V
s s s
P1
s
EEV
OR-22
AWG
AB
4W
AIR-2
DHW
Air-3
Confonet
GND
+5V
RX
TX
+12V
B
GND
CAN -H
CAN -L
12V
BA
A
Air-1
Confoclime
Power Monitor
HL
CM
ID
YE-GN-
1mmq
YE-0.35mmq
GN-0.35mmq
GY-0.35mmq
WT-0.35mmq
BN-0.35mmq
RD-22
AWG
YE-22
AWG
BK-22
AWG
GY-22
AWG
BL-22
AWG
BK-1mmq BK-1mmq
VT-1mmq VT-1mmq
YE-GN-1mmq YE-GN-1mmq
BN-1mmq
GY-1mmq
BK-22
AWG
BK-22
AWG
BK-22
AWG
BK-22
AWG
BK-22
AWG
BK-22
AWG
BK-22
AWG
BK-22
AWG
BN-0.35mmq
YE-0.35mmq
GN-0.35mmq
WT-0.35mmq
YE-GN-1mmq
RD-22
AWG
BK-22
AWG
YE-22
AWG
BL-22
AWG
GY-22
AWG
BN-22
AWG
GN-22
AWG
BN-1mmq
BK-1mmq
RD-1mmq
RD-1mmq RD-1mmq
BK-1mmq
BN-1mmq
BN-1mmq
GY-1mmq
OR-1mmq BN-1mmq RD-1mmq
BK-1mmq
YE-22
AWG
WT-22
AWG
BK-22
AWG
BK-22
AWG
RT
IPT
OT
OPT
CP
FS-1
BN-
1mmq
BL-
1mmq
BL-
1mmq
BN-
1mmq
POWER SUPPLY
-230 VAC-
BN-22
AWG
N500233A
ATADAMRIFACIFIDOM.VERENOIZIRCSEDECIDOC
N570016A
1Rivisto le disposizioni dei cavi all'interno del quadro elettrico Nicola Rossi 19/04/2022
2Aggiunto cavo di terra sulla morsettiera Nicola Rossi 07/11/2022

EN - 20
2.8 Commissioning the ComfoClime
After installation, the ComfoClime system must be commissioned.
In case of retrofitting installation, it's recommended that the ComfoAir Q has the latest
firmware with a minimum of release 1.10 (see ComfoAir Q manual).
Proceed with the unit activation according to the following steps:
Step Action
1Connect to the ComfoAir Q and the ComfoClime to the power supply;
2On the upper front part of the ComfoClime one green LED should turn on to indicate the
correct installation and functioning (see Par. 2.11 Troubleshooting for details);
3Proceed with the CAQ commissioning (see CAQ installer manual);
4
Once the CAQ commissioning is finished it is possible to begin the setup procedure of
the ComfoClime, through the control device (see the ComfoClime 34/36 User manual for
provisioning and configuration instructions).
2.9 Operation
The ComfoClime works by supplying the air at a given temperature, in order to fulfil the comfort
condition set by the user through the ComfoClime Control app.
The supply air temperature is automatically determined by the ComfoClime accordingly to the outdoor
conditions and the chosen comfort profile.
In cooling mode the ComfoClime doesn’t control the humidity in an active way but accordingly to
the whole system capability. The ComfoAir Q, only when fitted with the enthalpy cube, balances the
humidity between the outdoor air and the exhaust air; afterwards the ComfoClime heat pump, based
on the operating mode (heating or cooling mode), will reduce the absolute humidity.
For example:
- In heating mode the ComfoClime raises the air temperature reducing automatically the relative
humidity without condensation;
- In cooling mode the ComfoClime cools down the air reducing the relative humidity through
condensation.
2.10 Maintenance - Service
The ComfoClime doesn’t require any ordinary maintenance activity.
A general accurate and deep cleaning is requested every 2 years at least. Please contact Zehnder
Service for it or refer to the Service Manual.
WARNING!
Before every operation over the unit please disconnect the electric power.
CAUTION!
For others maintenance operations please refer to the Service manual. Only Zehnder
authorised personnel should open on the unit.