The latest generation of ventilation units with heat recovery
CoolingFilteringHeatingVentilation
Service and recommendations
The latest heat recovery range from Zehnder is called ComfoAir XL.
This range provides a healthy and pleasant indoor climate especially for use in commercial buildings and
apartment blocks.
There are numerous options with regard to the range of versions, control system technology, options and
accessories. You can also arrange your unit combinations yourself. We are pleased to help you achieve your
optimal ventilation system.
We would be delighted to support you:
■ Detailed recommendations based on a special operating point/with price details
■ Support in the project (draft and implementation)
■ Instructions on ventilation systems
■ Telephone/personal assistance
People in a perfect indoor climate: for a nicer living area, work area and living environment.
We give you our word.
Zehnder ‘always around you’.
All rights reserved.
Utmost care and attention has been taken to create this document; however, the publisher cannot be held liable
for any damage arising from missing or incorrect representation of information in this document. In the case of
dispute, the Dutch version of the text shall have priority.
2
Table of contents
1. General ......................................................................................................................................................................4
1.1 Important features ............................................................................................................................................... 4
1.2 Passive house certification.................................................................................................................................. 4
1.3 ComfoAir XL series and options ......................................................................................................................... 4
3 Control unit ............................................................................................................................................................. 10
4.1 Cod i n g ............................................................................................................................................................... 11
6. Technical data ........................................................................................................................................................ 16
6.1 Technical data ComfoAir XL 800 ....................................................................................................................... 16
6.2 Technical data ComfoAir XL 1500 ..................................................................................................................... 18
6.3 Technical data ComfoAir XL 2200 ..................................................................................................................... 20
6.4 Technical data ComfoAir XL 3300 ..................................................................................................................... 22
6.5 Technical data ComfoAir XL 4400 ..................................................................................................................... 24
6.6 Technical data ComfoAir XL 6000 ..................................................................................................................... 26
The ComfoAir XL series is a new generation of heat
recovery units, which is suitable for use in commercial
buildings and/or in apartment buildings. The ComfoAir XL
series covers 6 different capacities from 800 to 6000 m³/h.
1.1 Important features
■ Heat recovery of approx. 90 %
■ Capacity up to 6000 m³/h
■ Equipped with 100 % bypass
■ Passive house certification
■ Renewed controller (ModBus communication)
■ Constant volume and pressure control possible
■ Unique, air-tight housing
■ Renewed filter concept
■ Filter monitoring with pressure sensors
■ Easily accessible connection PCB
■ Unit easy to configure at specific operating point
■ Diaphragm siphon installed as standard
1.2 Passive house certification
The ComfoAir XL units were
designed in cooperation with
the Passive House Institute
(PHI) and in accordance with its
directives. The units have
passive house certification.
This means that they satisfy the
stringent requirements applied
by the Passive House Institute, whereby this series
achieves greater energy savings (25 %) than the
previous generation. The specific SFP value (specific
fan output) is less than 0.34 W/(m³/h).
Air direction:
■ Left (L)
■ Right (R)
Air direction for left-side version
The intake opening for the outside air is located at
the top right and the outlet opening for the used air
is located at the top left. The extract air is located at
the bottom right and the air supply at the bottom left.
1
EHA
2
SUP
Air direction for right-side version
The intake opening for the outside air is located at
the top left and the outlet opening for the used air is
located at the top right. The extract air is located at
the bottom left and the air supply at the bottom right.
3
ODA
4
ETA
Filter:
■ Cellular filter F7/G4 (PF)
■ Bag filter F7/G4 (BF)
ODA
ETA
EHA
SUP
3
4
1
2
1.3 ComfoAir XL series and options
The ComfoAir XL series is available in a variety of
versions and with numerous options. The focus was
placed on the smallest possible dimensions during
development of the units.
Versions:
■ ComfoAir XL 800
■ ComfoAir XL 1500
■ ComfoAir XL 2200
■ ComfoAir XL 3300
■ ComfoAir XL 4400
■ ComfoAir XL 6000
Mounting:
■ Indoor installation (I)
■ Outdoor installation (A)
4
Options:
■ Bypass:
- Bypass open/closed (B)
- Bypass modulating (BM)
■ Pre-heater (PRH)
■ Post-heater (POH)
■ Cooler (CL)
■ Outside air flap (DMP-ODA)
■ Exhaust air flap (DMP-EHA)
1
EHA = Exhaust air
2
SUP = Supply air
3
ODA = Outdoor air
4
ETA = Extract air
1.4 Block diagram
- Filter
- Heater
- Cooler
- Heat exchanger
- Fan
- Temperature sensor
- Bypass
- Flap
ODA - Outside air
EHA - Exhaust air
ETA - Extract air
SUP - Supply air
5
2. Set-up
2.1 Air-tight housing
The housing of the ComfoAir XL has a unique quality.
The double seals on the panels ensure that the
housing is perfectly air tight. The housing comprises
a self-supporting structure that is made from doublewalled panels with internal insulation that is 44 mm
thick. The panels are produced from sendzimir sheet
with a weatherproof Plastisol coating (Goosewing
Grey – RAL 7044) applied to the outside. A special
polyester coating (RAL 7035) is applied to the inside.
These panels are free from thermal bridges and
guarantee excellent insulation of the housing. The
draft focusses on compliance with the Passive House
Directive (internal and external leaks lower than 3 %).
An overview of the specifications is provided below.
FeatureClass
Mechanical strength2A
Internal leak (at 40 0 Pa)< 3 % of the nominal volume
External leak (at 400 Pa)< 3 % of the nominal volume
Thermal insulationT2 (0,51 Wm2/K )
Thermal bridge factorTB1
Fire resistantB
Angled profile
1. Foam
2. Sendzimir sheet 0.7 mm with Plasticol coat
RAL 7044
3. Sendzimir sheet 1.0 mm with powder coating
RAL 7035
The ComfoAir XL series consists of directly driven,
energy-saving EC fans with backward-curved blades.
These fans achieve an energy saving of more than
25% compared to conventional AC fans. These fans
are mounted vibration-free onto a mounting bracket.
This obviates the need for flexible sleeves to ensure
a vibration-free connection of the air ducts.
Error message
An alarm function is included in the control board as
standard. This alarm function is activated if a fan
fails. The error message can also be activated by
measuring the pressure difference via the supply air
filter if desired.
2.3 High-performance plate heat
exchanger
The HR cross-counterflow heat exchanger (HR plate
heat exchanger) is made of high-grade aluminium
and has a thermal efficiency of approx. 90 %
depending on the outside temperature and the air
humidity in the rooms. The exchanger is corrosionfree and resistant to seawater and can be fully
recycled.
Benefits of a high-performance plate heat exchanger:
■ No wear
■ Easy to maintain
■ 100 % separate air streams
■ Low risk of contamination
Frost protection
Under certain circumstances, condensate can freeze.
To prevent this, frost protection is incorporated. This
shuts down the supply fan when there is a risk of
frost and can deactivate it for a short period.
2.4 Siphon
A siphon is installed to remove condensate that
forms in the plate heat exchanger.
An external diaphragm siphon must be connected to
remove the condensate that forms on the cooler. The
siphon can be kept frost-free by using an insulated
ribbon heating element. The contact for supply and
control can be set in the software.
2.5 Bypass
ComfoAir XL is equipped with a 100 % bypass. The
control unit of the ComfoAir XL automatically brings
the bypass valve to the closed and open positions.
This bypass is located near the heat exchanger and
is controlled by a counter-rotating bypass valve,
which is controlled automatically by a servo motor.
When the bypass valve opens, the extract air flows
around the high-performance plate heat exchanger
and no thermal transfer takes place. The filter system
continues to work, however. In this way, it is possible
to use what is referred to as 'free cooling' or night
ventilation in the evening and during the night.
Please also refer to the block diagram in chapter 1,
section 4 for details of bypass operation.
Outside air
Extract
air
Exhaust
air
Supply air
Open/closed or modulating bypass
ComfoAir XL can be equipped with an open/closed
or modulating bypass. The servomotor regulates the
modulating bypass and ensures that the temperature
of the supply air is constant. This is particularly
important when the unit has a cooling battery.
2.6 Filter
Two types of filters are available for filtering the
supply and exhaust air flows: one cellular filter and a
bag filter. The supply air flow is equipped with a F7
filter as standard, the exhaust air flow is equipped
with a G4 filter. With the newly developed filter
clamps, the filters are mounted onto the filter frame,
which minimises leaks. The units are equipped with a
filter monitor as standard. This is achieved with
pressure sensors that measure the resistance via a
filter to issue dirt notification.
7
2.7 Batteries
The ComfoAir XL series can optionally be equipped
with a pre-heater and post-heater or cooler.
The battery connections are attached outside the
unit. The control unit for these batteries is set up to
be equipped with several power relays (230 V) and
0-10-volt outputs via the connection board of the
unit. The connection board issues a 0-10 V signal to
control the two-way valve. The power relay (230 V) is
used to supply the circulation pump.
The batteries must be connected to an externally fed
cold and/or hot water supply. All batteries must be
selected on a project-related basis.
Pre-heater
A pre-heater can be attached to
pre-heat the cold outside air in winter.
This heating battery is positioned in
front of the heat exchanger and can be
used as a frost protection system. The
preheater is calculated on the basis of
the water/glycol medium to prevent the
battery from freezing.
Cooling battery
A cooling battery is used to cool
the supply air. This battery is
positioned behind the heat
exchanger like the post-heater.
The cooling battery is mounted on
the drain plate to collect
condensate. A polypropylene
droplet catcher that runs to the
drain plate is positioned behind
the cooling battery in the direction
of air flow.
2.8 Flaps
Flaps can be used to protect the unit
against outside influences when it is
not in operation. The intake can be
equipped with a lockable flap either
for the outside air or the exhaust air.
Post-heater
The post-heater increases the
temperature of the supply air. In this
way, air can be blown in at a higher
comfort temperature. The post-heater
is located behind the heat exchanger
in the direction of the air flow.
8
2.9 Design
J
L
QQK
H
EF
C
II
J
ComfoAir XL is equipped with the following components as standard:
■ A: Plate heat exchanger with high-performance heat recovery
■ B: Drain plate below the plate heat exchanger with siphon
■ C: Two EC fans with backward-curved blades
■ D: Main board
■ E: Connection PCB
■ F: Operating switch
ComfoAir XL is equipped with the following components as standard for mounting indoors:
■ G: Metal support frame
ComfoAir XL is equipped with the following components as standard for mounting outdoors:
■ G: Support frame made of galvanised metal
■ H: Coated metallic cover
■ I: Two droplet catchers
Options:
■ J: Panel or bag filter, filter class 7 for outside air and G4 for extract air
■ K: Bypass valve open/closed or equipped with modulating servomotor
■ L: Pre-heater to ensure controlled ventilation
■ M: Post-heater for enhanced comfort
■ N: Chiller for dehumidifying and cooling the supply air
- O: Droplet catcher behind the cooler to collect moisture
- P: Drain plate with condensate drain below the chiller
■ Q: Flap with servomotor
G
ABC
D
MNOP
9
3 Control unit
3.1 Controller
ComfoAir XL is equipped with a multifunctional
controller. The control unit comprises two different
PCBs. The main board, to which all internal
components can be connected, is located inside the
unit. All external functions are bundled at the
connection PCB. This is located behind the designer
front panel and is easily accessible to implement
numerous connections. The units have an automatic
frost-protection.
Essential features:
■ Connection to the building technology via ModBus communication
■ Constant Air Flow: to set fixed capacities
■ Filter monitoring: Pressure sensors measure the resistance via the filter
■ The unit software is equipped with a timeswitch as standard
■ Control via external sensor: CO
■ Various connections: 230 V, power relay
■ Generation of summer night cooling via digital input
■ Compatible with fire alarm system via digital input
■ Summer night cooling: activation via an external signal
■ Frost protection for the high-performance plate heat exchanger:
the supply fan is shut down when there is a risk of frost
, pressure, relative air humidity
2
ComfoAir XL is easy to change over from constant air
volume control to pressure control. This type of
control requires a pressure sensor to measure the
pressure in the supply air or extract air duct.
3.2 Supply
An integrated operating switch is located at
the operating side of the ComfoAir XL unit.
The connection terminals and connection board are
located behind the designer front panel. The board is
equipped with a display as standard, which can be
used easily to set the desired operating point.
The power supply is connected to the operating
switch. All versions, except for ComfoAir XL 6000,
are equipped with a 230 V/50 Hz/1~ power supply.
ComfoAir XL 6000 must be equipped with a
400 V/50 Hz/3~ power supply.
10
4. Quick selection
4.1 Coding
ComfoAir XL 800 CFE R B I PF CL PRH POH DMP-ODA
DMP ODA = Outside air flap
DMP EHA = Exhaust air flap
POH = Post-heater
PRH = Pre-heater
CL = Cooler
PF = Cellular filter
BF = Bag filter
I = Indoor installation
O = Outdoor installation
B = Bypass open/closed
BM = Bypass modulating
4.2 Selection schematic
Overview of air capacity
Type
R = Right-handed version
L = Left-handed version
CFE= Counterflow plate heat exchanger
Product type designation
(air volume in m³/h)
Product family name
: Capacity according to Passive House Directive
: Total capacity, reported at least 200 Pa.
11
4.3 Selection chart
Typ e
Air volume m³/sm³/s
Air volume m³/hm³/h
External static pressure (in connection with cooler, pre-heater and post-heater)Pa
Max. consumed power (excluding cooler, pre-heater and post-heater)kW
VoltageVAC
Max. consumed power (excluding cooler, pre-heater and post-heater)A
FrequencyHz
Cos π-
Protection systemFuse
HE AT RECOVE RY
- Outside air conditions°C/RH
- Extract air conditions°C/RH
- Total heat recovery pe rformance: %
- Total heat recovery pe rformance according to NEN 5138:2004 %
COLD RECOVERY
- Outside air conditions°C/RH
- Extract air conditions°C/RH
- Temperature efficiency (perceptible performance)%
The dimensions refer to the above-mentioned standard unit, version with cellular filter (PF).
For these dimensions, a post-heater (POH) can be used as standard.
Typ e
ComfoAir XL 800 175 0700116 8525 x 395235-275
ComfoAir XL 1500175 0105 01168875 x 395310 -3 40
ComfoAir XL 220025147001500612 x 612450 -600
ComfoAir XL 3300251410 501500962 x 612600 -750
ComfoAir XL 44002514140015001312 x 6 12750-900
ComfoAir XL 600025141750150 01662 x 612900 -10 5 0
L
[mm]
B
[mm]
H
[mm]
Air connection
[mm]
Weight
[kg]
The following dimensions refer to the additional length of the optional components.
Option
Bag filter (BF) or pre-heater (PRH)* or empty section350
Cooler (CL) or empt y section350
Additional length
[mm]
* ComfoAir XL 800 and ComfoAir XL 1500 do not require an additional length;
a pre-heater (PRH) fits as standard here.
14
5.2 Exterior mounting
The dimensions refer to the above-mentioned standard unit, version with cellular filter (PF).
For these dimensions, a post-heater (POH) can be used as standard.
Typ e
ComfoAir XL 800 175 0700116 8525 x 395335-385
ComfoAir XL 1500175 0105 01168875 x 395420-460
ComfoAir XL 220025147001500612 x 612560-75 0
ComfoAir XL 3300251410 501500962 x 612730-920
ComfoAir XL 44002514140015001312 x 6 12900-1090
ComfoAir XL 600025141750150 01662 x 612107 0-128 0
L
[mm]
B
[mm]
H
[mm]
Air connection
[mm]
Weight
[kg]
The following dimensions refer to the additional length of the optional components.
Option
Bag filter (BF) or pre-heater (PRH)* or empty section350
Cooler (CL) or empt y section350
Additional length
[mm]
* ComfoAir XL 800 and ComfoAir XL 1500 do not require an additional length for the PRH;
a pre-heater (PRH) fits as standard here.
15
6. Technical data
6.1 Technical data, ComfoAir XL 800
Specific fan power, pressure loss and sound level
■ Supply air max. line ■ Extract air max. line
■ Cooler supply air, pre-heater and post-heater ● Sound level
16
Operating pointSound, supply air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
13635272.66 6.758.358.959. 250.365
262515073.572 .163.463 .163.655.970
381826074.478.369.267. 968.662.375
Operating pointSound, extract air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
13635256.846.23 7.538.031.822.445
262515060.652.443.042.636 .127. 849
381826064.959.349.24 7. 940.933.955
Operating pointHousing radiation
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
13635246.050.341. 339.644.318.848
262515046.855.746.543.848.724.453
*
wA
*
wA
*
wA
381826047.861. 852.348.65 3.730.858
* ref L
w,0
-12
= 10
W; 0 m distance.
17
6.2 Technical data, ComfoAir XL 1500
Specific fan power, pressure loss and sound level
■ Supply air max. line ■ Extract air max. line
■ Cooler supply air, pre-heater and post-heater ● Sound level
18
Operating pointSound, supply air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
18818668.476.566.364.966 .160 .773
2111913969.376.968.767.068.163.074
3152826071.37 7. 774.071.872.768.278
Operating pointSound, extract air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
18818661.059.555.249.645.937. 657
2111913 961.861.75 7. 451.54 7. 639.659
315282606 3.766.662.355.851.444.263
Operating pointHousing radiation
Q
v
[m3/h]
P
[Pa]
188186
2111913 9
31528260
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
53.562.049.345.252.330.157
54.362.351.647. 354.332.359
56.363.25 7. 052.058.83 7. 562
L
dB(A)
*
wA
*
wA
*
wA
* ref L
w,0
-12
= 10
W; 0 m distance.
19
6.3 Technical data, ComfoAir XL 2200
Specific fan power, pressure loss and sound level
■ Supply air max. line ■ Extract air max. line
■ Cooler supply air, pre-heater and post-heater ● Sound level
20
Operating pointSound, supply air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
19865069.372.559.262.663.056.069
2149 811672.076.869.871.071. 065.277
3218724775.782.684.282.381.77 7. 688
Operating pointSound, extract air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
19865060.163.649.549.341.433.857
2149 811665.366.059.758.049.442.263
3218724772.469.373.469.660.253.674
Operating pointHousing radiation
Q
v
[m3/h]
P
[Pa]
198650
2149 8116
32187247
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
54.663.447. 346.350.729 .1
57. 367.757.954.758.638.3
60.973.572.366.069.350.8
[dB]
L
dB(A)
57
64
74
*
wA
*
wA
*
wA
* ref L
w,0
-12
= 10
W; 0 m distance.
21
6.4 Technical data, ComfoAir XL 3300
Specific fan power, pressure loss and sound level
■ Supply air max. line ■ Extract air max. line
■ Cooler supply air, pre-heater and post-heater ● Sound level
22
Operating pointSound, supply air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
2000 Hz
[dB]
4000 Hz
[dB]
L
dB(A)
1178 87372.68 2.172.074 . 072.76 7. 679
226231587 7.08 7. 579 .181.079.574.786
3333425580.792.28 5 .186.985.280.892
Operating pointSound, extract air
Q
v
[m3/h]
P
[Pa]
125 Hz
[dB]
250Hz
[dB]
500 Hz
[dB]
1000 Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
L
dB(A)
1178 87364.564.659.349.246.638.360
2262315866.472.467. 456.553.045.468
3333425568.07 9 .174.46 2.758.451. 474
Operating pointHousing radiation
Q
v
[m3/h]
P
[Pa]
1178 873
22623158
33334255
125 Hz
[dB]
250Hz
[dB]
500 Hz
[dB]
1000Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
55.35 7. 950.252.749.634.557
59.763.357. 259.656.341.663
63.468.063.265.662.047. 669
L
dB(A)
*
wA
*
wA
*
wA
* ref L
w,0
-12
= 10
W; 0 m distance.
23
6.5 Technical data, ComfoAir XL 4400
Specific fan power, pressure loss and sound level
■ Supply air max. line ■ Extract air max. line
■ Cooler supply air, pre-heater and post-heater ● Sound level
24
Operating pointSound, supply air
Q
v
[m3/h]
P
[Pa]
125Hz
[dB]
250Hz
[dB]
500 Hz
[dB]
1000Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
L
dB(A)
122286479.961.26 2.164.660.551.669
2326113782.387. 081.583.580.474.887
3445325679.69 1.885.586.984.679.791
Operating pointSound, extract air
Q
v
[m3/h]
P
[Pa]
125Hz
[dB]
250Hz
[dB]
500 Hz
[dB]
1000Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
L
dB(A)
122286465.459 .153.449.947. 337. 257
2326113774. 27 7.76 7. 864.863 .155.973
3445325675.383.772.669.969 .163.278
Operating pointHousing radiation
Q
v
[m3/h]
P
[Pa]
1222864
23261137
34453256
125Hz
[dB]
250Hz
[dB]
500 Hz
[dB]
1000Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
72.647. 545.546.844.820.457
74. 973.364.965.764.743.671
72.378 .168.86 9 .168.848.575
L
dB(A)
*
wA
*
wA
*
wA
* ref L
w,0
-12
= 10
W; 0 m distance.
25
6.6 Technical data, ComfoAir XL 6000
Specific fan power, pressure loss and sound level
■ Supply air max. line ■ Extract air max. line
■ Cooler supply air, pre-heater and post-heater ● Sound level
26
Operating pointSound, supply air
Q
v
[m3/h]
P
[Pa]
125Hz
[dB]
250Hz
[dB]
500 Hz
[dB]
1000Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
L
dB(A)
131056783.475.070.872.468.361.776
2459214683.88 5.179.380.876.470.585
3589924283.69 4.18 7. 088.48 3.778.392
Operating pointSound, extract air
Q
v
[m3/h]
P
[Pa]
125Hz
[dB]
250 Hz
[dB]
500 Hz
[dB]
1000Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
L
dB(A)
131056770.672.060.456.652.542. 266
2459214675.478.868.26 5.161.251. 973
3589924279.685.47 5.172.869. 260.980
Operating pointHousing radiation
Q
v
[m3/h]
P
[Pa]
1310567
24592146
35899242
125Hz
[dB]
250Hz
[dB]
500 Hz
[dB]
1000Hz
[dB]
200 0Hz
[dB]
400 0Hz
[dB]
78 .165.557. 557. 656.730.465
78.575.665.966.064.839.272
78.384.673.673.672.14 7. 080
L
dB(A)
*
wA
*
wA
*
wA
* ref L
w,0
-12
= 10
W; 0 m distance.
27
7. Accessories
SAG 0-3V
ComfoAir XL keeps the air volume constant. Output
can be programmed in three air volume stages via a
display. The SAG 0-3 CV switch can then be used to
select the stages high, medium and low.
The housing is white (RAL 9010) and ideal for
installation in a fitted housing with a depth of 40 mm.
A surface-mounted housing is available for mounting.
CO
sensor
2/s
ComfoAir XL can also be controlled using a CO
sensor. A CO2 sensor measures the CO2
concentration in the ambient air at the position to
which it is attached. The CO
vent stage on the basis of the ventilation requirement
in the room. If the CO
2
ventilation stage is increased automatically. If the
CO
concentration is low, the ventilation stage is
2
reduced automatically.
Diaphragm siphon
A diaphragm siphon does not have a gooseneck;
instead it comprises a non-return valve made of
silicone rubber, which opens as soon as water
presses against the membrane and closes again due
to the vacuum in the unit. The siphon can be
equipped on request with a heating cable to protect
against frost or the formation of ice.
sensor selects the air
2
concentration is high, the
2
Siphon heater
Siphons are sensitive to frost. Siphon heating
reduces the risk of frost damage.
Joining piece
All units are delivered with rectangular connections
and tubtaras. They can be used to connect a drain
from rectangular to round.
28
Zehnder Group Deutschland GmbH · Sales International · Almweg 34 · 77933 Lahr · Germany