asset-technical-specification-zehnder-comfoair-7027617Zehnder ComfoAir 70
Technical specification for decentralised comfort ventilation unit
Decorative radiators Comfortable indoor ventilation Heating and cooling ceiling systems Clean air solutions
COMFOAIR 70
2
General
Zehnder ComfoAir 70 is a decentralised comfort ventilation
unit with heat and humidity recovery using synchronous
supply and extract air operation. It is often used in apartment
renovations as well as in new residential builds. The comfort
ventilation unit is particularly suited for one- and two-room
apartments, vacation and student apartments.
An additional room can be connected to the adjoining room
connections for supply or extract air using Zehnder air
distribution (optional). An enthalpy exchanger, which ensures
a high degree of heat and humidity recovery, is standard on
the unit, which has a positive effect on the room humidity and
therefore provides a comfortable indoor climate.
Zehnder ComfoAir 70 can be installed with various outside
wall hoods or a reveal module for almost invisible integration
of the external and exhaust air ducts in the window reveal.
ComfoAir 70
with white aluminium outside
wall panel
ComfoAir 70
with plastic
outside wall panel
ComfoAir 70
with stainless steel outside
wall panel
Zehnder ComfoLED electronic
control panel
Benefits
■Exceptionally good indoor climate, high energy efficiency and
maximum hygiene due to washable enthalpy exchanger
■Quiet operation for maximum living comfort, even in inner-city
residential areas, due to high-quality radial fans and good
insulation, which ensure excellent acoustic protection values
(standard sound level difference up to 46 dB)
■Maximum climate comfort thanks to synchronous supply
air/extract air operation for continuous heat and humidity
recovery and demand control using optional humidity, CO2
and VOC sensor boards
■Maximum flexibility in planning thanks to optional
components such as adjoining room connection, reveal
module and sensor control
■Simple and quick installation with minimal intrusion into the
living space
■Attractive and discreet appearance: The plastic outside wall
panel can be painted over to match the colour of the wall.
Alternatively, if the reveal module is used, the outside and
exhaust air ducts disappear almost invisibly into the window
reveal, so that the appearance of the facade is not affected
■Clean operation, as no condensate disposal is necessary
due to the enthalpy exchanger
■Intuitive and extended operating convenience due to
integrated control panel and/or external control panel
Zehnder ComfoLED
Technical data
Zehnder ComfoAir 70
Unit dimensions
Inside wall panel (W x H x D)
outside wall panel (W x H x D)
440 x 660 x 145 mm
380 x 376 x 50 mm
Outside wall thickness Min. 275 to 900 mm
Wall mounting pipe Ø 250 mm
Length 600 mm (optionally 900 mm)
Core hole drilling Ø approx. 270 mm
Fans DC radial fan
Filter class Supply/extract air ISO Coarse ≥ 70%
(G4) (optionally supply air ISO ePM10
≥ 60% (F7))
Heat emitter Cross-counterflow enthalpy exchanger
Casing Powder-coated aluminium, RAL 9016,
fine structure, matt
Unit core Expanded polypropylene (EPP)
Electrical connection 230 VAC/50–60 Hz
Max. current draw 0.15 A
Power consumption 4 W to 17 W (standby: < 1 W)
Protection class II (protective insulation)
Degree of protection IP20
Volume flow 15 - 25 - 40 - 60 m³/h
Energy efficiency Up to 90% heat recovery
Up to 84% humidity recovery
Weight 22 kg (unit) / 3.8 kg (reveal)
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* Depending on the unit
configuration chosen.
Detailed information on page 6.
ComfoAir 70
with reveal module
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COMFOAIR 70
3
Zehnder ComfoAir 70
Application -20 °C to 40 °C
Frost protection From -5 to -15 °C, unit then switches to
standby mode
Control 4 fan speeds, standby, filter and fault
message, shutters seal automatically in
standby mode, optional sensor control
by means of humidity, VOC and CO2
sensor
Leakage
(in acc. with DIN 13141
Part 8 – 2006)
Internal: 0.1%
External: 0.9%
DiBT
Product Zehnder ComfoAir 70
and ComfoAir 70
with adjoining room
connection
Approval number Z-51.3-396
Extract air volume flow Vab [m³/h]15 ≤ V.Ab ≤ 60
Heat recovery efficiency ηWRG [-]72%
Specific electric power consumption
рel [W/(m³/h)]
0.21
“Passivhaus” certification
Component ID 0826vs03
Application [m³/h]20 - 40
Heat recovery efficiency ηWRG [-]85%
Specific electric power consumption
рel,spec [W/(m³/h)]
0.24
Humidity recovery ηX [-]64%
EU Energy Consumption Label
Energy efficiency class *
Maximum air volume flow [m³/h]50–60
Sound power level LWA [dB(A)]34–47
Energy figures
* Depending on the unit configuration chosen.
Detailed information on page 6.
Article numbers
Description Article number
Zehnder ComfoAir 70, white aluminium outside
wall panel, without wall installation tube
527 007 230
Zehnder ComfoAir 70, plastic outside wall panel,
without wall installation tube
527 007 240
Zehnder ComfoAir 70, stainless steel outside
wall panel, without wall installation tube
527 007 250
Zehnder ComfoAir 70 with built-in humidity
sensor board, plastic outside wall panel,
without wall mounting pipe
527 008 780
Zehnder ComfoAir 70 for installation with
reveal module, without outside wall panel and
wall mounting pipe
527 008 590
Accessories Article number
Reveal module for ComfoAir 70 527 008 670
Round wall mounting pipe made of plastic,
Ø 250 mm, length = 600 mm
527 005 200
Round wall mounting pipe made of plastic,
Ø 250 mm, length = 900 mm
527 009 120
Square wall mounting pipe made of EPP,
268 x 268 (W x H), length = 600 mm
527 005 800
Extension set for ComfoAir 70, made of EPP,
external diameter 250 mm, length = 300 mm
527 009 140
Sealing tape for Zehnder ComfoAir 70,
for an adjoining room connection
521 000 580
Zehnder ComfoLED electronic control panel 527 007 290
Humidity sensor board 527 007 260
Humidity and VOC sensor board 527 007 270
Humidity and CO2 sensor board 527 007 280
Filter set for Zehnder ComfoAir 70
ISO Coarse ≥ 70% (G4)
(contents 2 pieces)
527 005 180
Filter set for Zehnder ComfoAir 70
ISO Coarse ≥ 70% / ISO ePM10 ≥ 60% (G4 / F7)
(contents 2 pieces)
527 005 190
Filter set for Zehnder ComfoAir 70
ISO Coarse ≥ 70% (G4)
(contents 10 pieces)
527 005 160
Filter set for Zehnder ComfoAir 70
ISO Coarse ≥ 70% / ISO ePM10 ≥ 60% (G4 / F7)
(contents 10 pieces)
527 005 170
Scope of delivery
To install Zehnder ComfoAir 70 into the wall, a wall mounting
pipe is required, which must be ordered separately. The unit
is delivered ready to install with the chosen outside wall panel
and power supply for a 230 VAC connection. For installation
of Zehnder ComfoAir 70 with reveal module, the unit must be
ordered without outside wall panel and wall mounting pipe.
The reveal module with fixed round wall mounting pipe (length =
580 mm) for Zehnder ComfoAir 70 with external wall grilles
must be ordered separately.
Level of efficiency
The generously proportioned enthalpy exchanger, the core of
the ventilation unit, functions particularly energy-efficiently. It
uses both the sensitive and the latent energy in the extract air.
Heat recovery of up to 90% and humidity recovery of up to
84% are possible. Using humidity recovery, the unit functions
at temperatures as low as -5 °C without the need for a pre-
heater or frost protection. This also saves energy and provides
a comfortable indoor climate.
COMFOAIR 70
4
The comfort ventilation unit has automatic frost protection.
The optional external Zehnder ComfoLED electronic control
panel allows Zehnder ComfoAir 70 to be conveniently
operated remotely. The functions of the external electronic
control panel correspond to those on the integrated control
panel. If an external control panel is installed, the internal
control panel supplied as standard remains fully functional.
As an option, sensor boards to control humidity, VOC or CO2
can also be used. In the automatic function, the ventilation
unit's control panel checks the measurement results of
the sensors and controls the unit's fan speeds to ensure
maximum living comfort.
Maintenance
Routine maintenance of Zehnder ComfoAir 70 is easy to
carry out and should be performed regularly to keep the
ventilation unit operating in a flawlessly hygienic manner.
After the cover is removed, the filters can be pulled out of
the housing without tools. The enthalpy exchanger can be
removed from the housing after the upper insulation element
is taken off. The enthalpy exchanger can be washed out
with water. Please see the user manual for information about
servicing tasks.
Frost protection
Using the enthalpy exchanger for humidity recovery, the unit
functions at temperatures as low as -5 °C without the need
for a pre-heater. Should the outside temperature fall below
that level, frost protection is activated to regulate the supply
of cold outdoor air. If the outside temperature falls further,
the unit switches to standby mode at -15 °C. Unit operation
is regulated by a temperature sensor. The unit begins to work
automatically when the outside temperature rises again.
Frost protection prevents the unit from freezing.
Adjoining room connection
Adjoining room connections (optional) can be mounted on
the back (in-wall) or on the side of Zehnder ComfoAir 70. An
additional room is connected to the supply or extract air with
joining piece ComfoTube 90 flat 51 and thus integrated into
the ventilation system. In order to minimise pressure losses,
distances should be kept to a minimum. For instance, the
unit can be installed in the bathroom and fresh air supplied
to the living or sleeping areas. The unit emits no noise in the
living/sleeping areas and the rooms are optimally supplied
with fresh air.
Fans
Supply and extractor fans are driven by energy-efficient EC
direct-current motors. The radial fans are resistant to wind loads.
The unit operates very quietly due to the arrangement of the fans
in the wall opening and the use of a special insulation material.
The fans can be set to any of four speeds.
Filters
Standard equipment on ComfoAir 70 includes supply and
extract air filters ISO Coarse ≥ 70% (G4).
After the expiry of a certain interval, an indicator on the
control panel indicates that the filter must be replaced. The
filters should then be replaced as soon as possible. A Class
ISO ePM10 ≥ 60% (F7) pollen filter can be installed in the
supply air inlet as an option.
Installation
The comfort ventilation unit is installed in an outside wall.
No condensate forms in the unit, therefore there is no
condensate drain. The facade of the house always remains
clean and dry, as no dirt can form due to condensate
dripping down.
Installation of the unit is quick and easy. A round wall
mounting pipe is available, which is inserted into the
core hole of the outside wall during renovations. For new
buildings, a square wall mounting pipe can be walled in as
an alternative. The Zehnder ComfoAir 70 is then inserted from
inside the room and screwed into place. A 230 VAC mains
power supply is connected behind the wall mounting system
of the unit. After the insulated tube is adjusted, the weather-
resistant outside wall panel is fixed to the outside wall. It is
that easy to install the unit and have it ready for operation
without great intrusion into the living space.
In addition, the outside and exhaust air can be ducted via
the window reveal. A reveal module, which is integrated into
the thermal insulation composite system, is available for this
purpose.
Operation
The built-in control panel on the front of the unit facilitates
easy, uncomplicated operation of the Zehnder ComfoAir 70
comfort ventilation unit. By briefly pressing the plus/minus
buttons, 4 fan speeds can be set or the unit can be switched
to standby mode. Fault messages are displayed and an
indicator lets you know when it is time to replace the filter.
The automatic function can be set by briefly pressing the
plus button from fan speed 4. Visualisation is implemented
by a separate LED. In standby mode, the built-in shutters
automatically seal off the outdoor and exhaust air openings
on the ventilation unit.
COMFOAIR 70
5
Tender specification
Zehnder ComfoAir 70 is a decentralised, compact comfort
ventilation unit with heat recovery and a large enthalpy
exchanger. The ventilation unit is perfectly suited for use in
the renovation of one- and two-room apartments, student
and vacation apartments, and for new builds. The housing is
made of powder-coated aluminium and is designed without
thermal bridges. The interior lining is made of expanded
polypropylene (EPP) to provide heat and sound insulation.
The outside wall panel is made of high-quality plastic and can
be painted over to match the colour of the wall. Alternatively,
the outside wall panel is available in stainless steel and white
aluminium.
In addition, the outside and exhaust air can be ducted via
the window reveal. A reveal module, which is integrated into
the thermal insulation composite system, is available for this
purpose.
Radial fans with direct-current motors are particularly
resistant to wind loads and allow economical operation with
a high degree of electrical efficiency. Supply and extractor
fans can be controlled separately and, in connection with an
adjoining room connection, can be precisely adjusted to the
balance air volume.
The core of Zehnder ComfoAir 70 is its generously
proportioned plastic cross-counterflow enthalpy exchanger.
With heat recovery of up to 90% and humidity recovery of
up to 84%, it ensures the maximum in energy recovery. No
condensate forms in the unit. It functions at temperatures
as low as -5 °C without the need for a pre-heater or frost
protection.
The unit is controlled by means of a built-in control panel on
the front of the unit. Four fan speeds, the automatic function
and standby mode can be set. The display shows fault
messages and lets you know when it is time to replace the
filter. The ventilation unit can also be controlled remotely with
the optional ComfoLED control panel.
Zehnder ComfoAir 70 is delivered ready to connect to the
230 VAC mains power supply with outside wall panel.
The wall mounting pipe must be ordered separately (not
required for the reveal module).
Sound transmission
Weighted sound
reduction index
Rw [dB]
Weighted normalised level
difference Dn [dB]
Unit with outside wall panel
Shutter open 17 40
Shutter closed 25 48
Unit with reveal module
Shutter open 23 46
Shutter closed 23 461) Measured by an independent testing laboratory, for
Zehnder ComfoAir 70 with outside wall panel and reveal module
As standard, Zehnder ComfoAir 70 is suitable for wall
thicknesses up to 600 mm. For wall thicknesses greater than
600 mm, an extension set (length = 300 mm) is optionally
available in combination with a round wall mounting pipe
(length = 900 mm).
The filters are located at the front and can be easily replaced
by the user without tools after removing the cover.
Zehnder ComfoAir 70 is mounted on the inner side of an
outside wall and vents outdoor and exhaust air directly via an
insulated wall tube.
Control possibilities:
■Four fan speeds, manual selection
■Automatic function can be selected
■Automatic frost protection
■Automatic shutter fastener
■Time-controlled filter replacement indicator
■Fault indicator
Options
■Pollen filter of filter class ISO ePM10 ≥ 60% (F7)
■Plastic, white aluminium and stainless steel outside wall
panel
■Reveal module for ducting the outside and exhaust air in
the window reveal
■Adjoining room connection for supply or extract air
■Round wall installation tube, made of plastic, Ø 250 mm,
length = 600 mm, with 2 blanking plugs, for retrofitting
■Round wall installation tube, made of plastic, Ø 250 mm,
length = 900 mm, with 2 blanking plugs, for retrofitting
■Square wall installation tube, made of EPP, 268 x 268,
length = 600 mm, with 2 blanking plugs, for new builds
■Extension set for ComfoAir 70, made of EPP, with 2 blanking
plugs, outside diameter 250 mm, length = 300 mm. For wall
thicknesses greater than 600 mm, in combination with round
wall mounting pipe length = 900 mm
■External Zehnder ComfoLED electronic control panel
■Humidity sensor board (optionally factory-fitted), humidity
and VOC sensor board, humidity and CO2 sensor board
Sound specifications
Noise level at a distance of 3 m, open space1)
Unit without
adjoining room
connection
Unit with one
adjoining room
connection
Unit with two
adjoining room
connections
Fan speed 1 11.0 dB(A)9.2 dB(A)2.9 dB(A)
Fan speed 2 23.6 dB(A)16.3 dB(A)16.0 dB(A)
Fan speed 3 29.4 dB(A)24.3 dB(A)16.2 dB(A)
Fan speed 4 36.4 dB(A)31.2 dB(A)22.7 dB(A)
COMFOAIR 70
6
1)The control is integrated in the ventilation unit
2) Energy efficiency class applies in combination with one or two adjoining room connections.
Energy efficiency class B without adjoining room connection
Operation data
Volume flow [m³/h]Thermal efficiency [%] Humidity efficiency [%] Power consumption [W]
Standby < 1
Fan speed 1 15 90 84 4
Fan speed 2 25 83 73 5
Fan speed 3 40 76 61 9
Fan speed 4 60 71 54 17
Pressure loss graph
Energy efficiency classes
Energy efficiency classes in accordance with EU Regulation no. 1254/2014.
Energy efficiency classes
Comfort
ventilation unit
Article number Control according to site requirements Manual control1)
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ComfoSpot 50 527 007 210
527 007 220
527 008 580
527 008 770
1.2)
Volume flow (m3/h)
Level 4
Level 3
Level 2
Level 1
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COMFOAIR 70
7
Dimensional drawings
Structural shell set round L = 600 mm
(also available with L = 900 mm)
Square structural shell
600
ComfoAir 70
Reveal module
Reveal module, frontal
Square structural shell
Extension set
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Release data: 15/10/2018
1810049CA70_1DE
Product data sheet for RVUs as per EU Regulation No. 1254/2014
Contains information requirement for RVUs as per EU Regulation No. 1253/2014
Room ventilation unit Zehnder ComfoAir 70
Supplier’s name or trademark Zehnder Group Zehnder Group
Supplier’s model identifier
ComfoAir 70
(without adjoining room connection)
ComfoAir 70 sensor technology(without adjoining room connection)
SEC [kWh/(m²a)] specific energy
consumption (cold, average, warm)-66.4 -32.9 -11.1 -76.3 -40.0 -16.6
SEC class A+B E A E
Type of ventilation unit Bidirectional RVU Bidirectional RVU
Type of drive installed Multi-stage drive Speed control
Type of heat recovery system Recuperative Recuperative
Thermal efficiency [%]76 76
Maximum air volume flow rate [m³/h] 60 60
Electric power input [W]17 17
Sound power level [dB(A)]47 47
Reference air volume flow rate [m³/h]42 42
Reference pressure difference [Pa] 0 0
SPI [W/(m³/h)]0.21 0.21
Control factor and control typology 1
Manual control Control according to
site requirements
0.65
Declared maximum internal and
external leakage rates [%]
Internal: 0.1 Internal: 0.1
External: 0.9 External: 0.9
Mixing rate U1 U1
Position and description of visual filter warning Warning on the unit
display
Warning on the unit
display
Internet address for assembly and
disassembly instructions
www.zehnder-
systems.de
www.international.
zehnder-systems.com
Airflow sensitivity to pressure variations [%]< 10 < 10
Indoor/outdoor air tightness [m³/h]to the outside: 5.2
to the inside: 6.9
to the outside: 5.2
to the inside: 6.9
AEC [kWh/a] annual electricity
consumption (cold, average, warm)871 334 289 704 167 122
AHS [kWh/a] annual heating saved
(cold, average, warm) 7,941 4,060 1,836 8,517 4,354 1,969
www.zehnder-
systems.de
www.international.
zehnder-systems.com
A+
ComfoAir 70 Declaration of Performance
COMFOAIR 70
Release data: 15/10/2018
1810049CA70_2DE
Product data sheet for RVUs as per EU Regulation No. 1254/2014
Contains information requirement for RVUs as per EU Regulation No. 1253/2014
Room ventilation unit Zehnder ComfoAir 70
Supplier’s name or trademark Zehnder Group Zehnder Group Ze hnder Group Zehnder Group
Supplier’s model identifier
ComfoAir 70
(1 adjoining room connection)
ComfoAir 70
sensor technology
(1 adjoining room connection)
ComfoAir 70
(2 adjoining room connection)
ComfoAir 70 sensor technology
SEC [kWh/(m²a)] specific energy
consumption (cold, average, warm)-68.5 -34.3 -12.1 -77.5 -40.8 -17.1 -68.5 -34.3 -12.1 -77.5 -40.8 -17.1
SEC class A+A E A A A E
Type of ventilation unit Bidirectional RVU
Type of drive installed Multi-stage drive Speed control Multi-stage drive Variable speed drive
Type of heat recovery system Recuperative
Thermal efficiency [%]76
Maximum air volume flow rate [m³/h] 50
Electric power input [W]17
Sound power level [dB(A)]42
Reference air volume flow rate [m³/h]36
Reference pressure difference [Pa] 50
SPI [W/(m³/h)]0.21 0.21 0.21 0.21
Control factor and control typology 1
Manual control
0,65Control according to
site requirements
1
Manual control
0.65
Declared maximum internal and
external leakage rates [%]
Internal: 0.1 Internal: 0.1 In
External: 0.9 External: 0.9
Mixing rate - - - -
Position and description of visual
filter warning
Warning on the unit display
Internet address for assembly and
disassembly instructions
Airflow sensitivity to pressure
variations [%]- - - -
Indoor/outdoor air tightness [m³/h]- - - -
AEC [kWh/a] annual electricity
consumption (cold, average, warm)845 308 263 693 156 111 845 308 263 693 156 111
AHS [kWh/a] annual heating saved
(cold, average, warm) 8,091 4,136 1,870 8,614 4404 1,991 8,091 4,136 1,870 8,614 4,404 1,991
Bidirectional RVU Bidirectional RVU Bidirectional RVU
Control according to
site requirements
Warning on the unit display Warning on the unit display Warning on the unit display
www.zehnder-
systems.de
www.international.
zehnder-systems.com
www.zehnder-
systems.de
www.international.
zehnder-systems.com
www.zehnder-
systems.de
www.international.
zehnder-systems.com
www.zehnder-
systems.de
www.international.
zehnder-systems.com
(2 adjoining room connection)
A+E A+E A+
Recuperative Recuperative Recuperative
76
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34
36
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36
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Internal: 0.1 Internal: 0.1 In
External: 0.9 External: 0.9
ComfoAir 70 Declaration of Performance
Zehnder America
6 Merrill Industrial Drive Unit 7
Hampton, NH 03842
603-601-8544 - info@zehnderamerica.com
www.zehnderamerica.com
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