Vallox 125 MV User manual

Manual
Model
Vallox 125 MV
Type
3765
Document
D11328
Valid from
01.09.2023
Updated
21.09.2023
Ventilation unit
MANUAL

2
INTRODUCTION............................... . . . . . 2
Safety ...................................................... . . . .3
Installation ............................................. . . . . . . .3
Warranty.................................................... . . . .3
Intended use ................................................ . . . .3
Disposal of the ventilation unit ................................ . . . . 3
Safety signs used in the instructions ........................... . . . .4
Installation options........................................... . . . .4
System description .......................................... . . . .4
Ventilation unit control ....................................... . . . .5
Ventilation unit control options. .......................... . . . . . . .5
Filter reminder ......................................... . . . . . . .5
Ventilation unit setup without a control panel .............. . . . . . . .5
Connecting the ventilation unit to the cloud service ........ . . . . . . .5
Main parts .................................................. . . . .6
INSTALLATION.................................. . . . . . 7
Mounting on the wall ......................................... . . . . 7
Mounting on the ceiling ...................................... . . . .8
Installing the ventilation unit to the ceiling mounting plate . . . . . . . . .8
Attic floor penetration plate.............................. . . . . . . .8
Removal of condensing water ................................. . . . .9
Dimensioning figures and space required for installation of the
Vallox Silent Klick siphon ................................ . . . . . . .9
Space required by the alternative Vallox Silent Klick siphon
installation method (elbow) .............................. . . . . . . .9
Measuring and adjusting the air flows of the ventilation unit ...... . . . .9
MAINTENANCE ................................ . . . 12
Before beginning maintenance work........................... . . . 12
Replacing the filters .......................................... . . . 12
Cleaning the heat recovery cell ............................... . . . 13
Condensing water ........................................... . . . 13
Cleaning the fans ............................................ . . . 14
TECHNICAL SPECIFICATIONS .... . . . 15
Internal electrical connection ................................. . . . 17
External electrical connection................................. . . . 18
External electrical connection for controlling the MLV duct radiator . . 19
Duct radiator operation....................................... . . 20
Duct radiator operation chart ................................. . . . 21
In the outdoor air duct .................................. . . . . . . 21
In the supply air duct.................................... . . . . . . 21
Exploded view and spare parts list ............................ . . 22
Conformity certificates ....................................... . . .23
NOTE
You can register your
Vallox MV ventilation
unit with the MyVallox
Cloud service and sign
in into your MyVallox
Cloud account at
www.myvallox.com.
CONTENTS
INTRODUCTION

3© Vallox Oy - All rights reserved
WARNING
The unit is not intended
for use by children
under 8 or by persons
with reduced sensory,
physical or mental
capabilities, or whose
lack of knowledge
and experience do not
ensure safe operation
of the unit.
Such persons can
use the unit under
supervision, or
by following the
instructions of someone
who is responsible for
their safety.
Children must be
supervised and not be
allowed to play with the
device.
SAFETY
Safe and appropriate handling requires knowledge of the basic
safety regulations, and of the intended use of the ventilation system.
Read this manual before operating the ventilation unit. Please keep
the manual for later reference. If you lose the manual, it can be
downloaded from our website.
This user manual contains all the information necessary for safe
operation of the system. All persons who operate and maintain
the ventilation system must follow the instructions provided in this
manual. Furthermore, all local accident prevention regulations must be
observed.
Installation
Installation and setup should only be carried out by a qualified
specialist. Electrical installations and connections must be carried out
only by an electrician and in compliance with local regulations.
WARRANTY
The guarantee and liability exclude damage resulting from:
• Inappropriate use of the ventilation system or the control unit
• Incorrect or inappropriate installation, setup or use
• Neglect of instructions concerning transportation, installation, use,
or maintenance
• Structural or electronic modifications or changes made to the
software
INTENDED USE
All Vallox ventilation units have been designed to provide appropriate
and continuous ventilation so as to present no threat to health and to
maintain structures in good condition.
IMPORTANT
In order to ensure that the indoor air presents no harm to
health and remains optimal also for the structures of the
building, ventilation must be kept on without disruptions. It is
recommended that ventilation be left turned on during long
holidays also. This keeps the indoor air fresh and prevents
humidity from condensing in the ventilation ducts and structures.
It also reduces the risk of moisture damage.
DISPOSAL OF THE VENTILATION UNIT
Do not dispose of electronic devices with household waste. Follow
local laws and regulations on safe and ecological disposal of the
product.
NOTE
For further information,
go to www.vallox.com
INTRODUCTION

4
SAFETY SIGNS USED IN THE INSTRUCTIONS
INSTALLATION OPTIONS
• Vallox 125 MV can be mounted either on the wall, or on the ceiling
by using a mounting plate (optional).
NOTE
The standard
equipment and
available accessories
vary from country to
country.
DANGER
Indicates a hazard that
will result in death or
serious injury if not
avoided.
WARNING
Indicates a hazard that
can result in death or
serious injury if not
avoided.
IMPORTANT
Indicates a hazard that
can result in damage to
property or loss of data
if not avoided.
CAUTION
Indicates a hazard that
can result in minor or
moderate injury if not
avoided.
NOTE
Indicates essential
information about the
product.
TIP
Provides additional
information about the
use of the product and
its benefits.
INTRODUCTION
SYSTEM DESCRIPTION
1. Internet
2. WLAN
3. Router
4. WLAN/LAN
5. Additional switch
6. Sensors MyVallox Cloud
MyVallox Home
Vallox MV
MyVallox control panel
Modbus KNX
KNX bus
module
1
23
4
5
6

5© Vallox Oy - All rights reserved
INTRODUCTION
IMPORTANT
Apartment-specific
ventilation units allows
residents to adjust the
ventilation eciency.
Ventilation is controlled
based on the need e.g.
through the cooker
hood, ventilation
control panel, or a
separate control centre.
In order to ensure that
the indoor air presents
no harm to health and
remains optimal also
for the structures of the
building, ventilation
must be kept on
without disruptions.
It is recommended
that ventilation be
left turned on during
long holidays also.
This keeps the
indoor air fresh and
prevents humidity
from condensing in
the ventilation ducts
and structures. It also
reduces the risk of
moisture damage.
NOTE
For the MyVallox Cloud/
Home instructions,
please go to
vallox.techmanuals.info/
ValloxMV/ENG/help/
webhelp
IMPORTANT
Prolonged overpressure
can result in damage
to the structures of the
building.
VENTILATION UNIT CONTROL
Ventilation unit control options
Operation of the Vallox ventilation unit can be controlled by the following
means:
• Through a MyVallox control panel installed in the building.
• Through the MyVallox Home local area network connection and the
MyVallox Home/Cloud user interface.
• Through the MyVallox Cloud service and the MyVallox Home/Cloud
user interface.
• Through a remote monitoring service or building automation that
uses voltage signals or Modbus messages.
In addition to the integrated humidity and carbon dioxide sensor,
ventilation can also be adjusted automatically by using the optional
carbon dioxide, humidity, or VOC (air quality) sensor. When these are
used, ventilation remains optimal even when the dwelling is unoccupied.
Each user can use the week clock to adjust the ventilation to fit their
individual lifestyle.
The ventilation unit’s integrated humidity and carbon dioxide sensors
adjust ventilation automatically according to the need. In addition,
ventilation can be automated by using optional carbon dioxide, humidity
or air quality (VOC) sensors.
Filter reminder
The unit reminds of the need to change filters in the popup window of
the compatible MyVallox control panel, in the MyVallox Home/Cloud user
interface and by changing the relay status, provided that a signal light
has been connected to the relay connectors and Maintenance reminder
has been chosen as the relay setting.
The filter reminder can be acknowledged by the following means:
• from the MyVallox control panel
• from the MyVallox Home/Cloud user interface
• with the Vallox Delico PTD EC and Vallox Capto PTC EC cooker
hoods — Push the damper position button four times at less than
one second intervals, starting from the Damper closed position.
Ventilation unit setup without a control panel
The ventilation unit setup can also be completed without a control panel.
For instructions, please go to
https://vallox.techmanuals.info/ValloxMV/ENG/help/webhelp
See instructions provided in the section Connecting the ventilation unit
to the computer.
Connecting the ventilation unit to the cloud service
The ventilation unit can be connected to the MyVallox Cloud service. The
cloud service allows for controlling ventilation remotely also, using e.g.
a smartphone or tablet. Also the unit software is updated automatically
through the cloud service. To connect to the cloud service, the
ventilation unit must be connected to the Internet via LAN and registered
with the cloud service. At the same time you create a MyVallox Cloud
account for yourself. Read more about the service at www.myvallox.com.

6
Extract air fan
3a
Supply air fan 3c
Fine filter for supply air 4a
Heat recovery cell
2a
Bypass damper of the HR cell
5a
Coarse filter for supply air
4b
Coarse filter for extract air 4c
Post-heating resistor
(in front of the supply air fan) 6a
MAIN PARTS
Additional heating resistor 6b
Safety switch 7a
Internal carbon dioxide
and humidity sensor 11a
Ceiling bushing for electric wires 9a
Control panel
10b
Carbon dioxide sensor (optional) 11c
Humidity sensor (optional) 11d
VOC sensor (Optional) 11e
INTRODUCTION
JOHDANTO
5a
11d
11e
10a
11c
2a
3c 3a
4c
6a
6b
11a
7a
9a
4a
4b
10b
Vallox 125A R model is shown in the figure.
In the L model, the parts are mirrored.
10a

7© Vallox Oy - All rights reserved
MOUNTING ON THE WALL
NOTE
Avoid mounting the unit on a hollow, echoing partition wall
or on a bedroom wall, or prevent the conduction of sound.
The minimum distance between the top of the unit and the
finished ceiling surface is 30 mm. Note that during mounting
the unit rises 10 mm higher than the final height.
Mount the ventilation unit on the wall with a mounting plate, as
shown in the figures below. Make sure that the unit is horizontally
level after mounting.
INSTALLATION
INSTALLATION
NOTE
When installing the unit,
reserve a space of at
least 500mm in front
of the unit for servicing
purposes.
NOTE
Mount the ventilation
unit in a place where
the temperature does
not fall below +10°C.

8
INSTALLATION
MOUNTING ON THE CEILING
The Vallox 125 MV units (excluding model B) can be equipped
with an optional ceiling mounting plate.
Installing the ventilation unit to the ceiling
mounting plate
CAUTION
The ventilation unit is very heavy. Do not perform this
procedure alone. Use appropriate lifting equipment,
where necessary.
1. Check that the condensate insulation rings are in place in
the outlet collars below the ceiling mounting plate.
2. Pull the operating levers (A) out and lock them by turning
them towards the outer sides of the unit.
3. Remove the door before installing the ventilation unit to the
ceiling mounting plate.
4. Lift the ventilation unit close to the ceiling mounting plate
and feed the cables and the connection box through the
hole in the ceiling mounting plate on top of the ceiling.
NOTE
Remember to make a service door in the ceiling so that
the cables and the connection box can be accessed.
The distance between the service door and the ceiling
mounting plate must be around 500mm.
Alternatively, the cables can be fed to the rear wall between
the ceiling mounting plate and the ventilation unit. Lift
the ventilation unit up against the ceiling mounting plate
by releasing the locking of the levers (A) by turning them
towards the center of the unit; the levers will lock the unit
to the ceiling mounting plate. Where needed, guide the
mounting hooks on the ceiling mounting plate (B) to the
grooves on the side panels of the ventilation unit. In the
locked position, the levers are at the same level as the front
edge of the ceiling mounting plate.
5. Where required, the unit can be detached from the ceiling
mounting plate. Remove the door of the unit, lift the unit
slightly upwards, pull out both operating levers (A) and lock
them (see section 2).
Attic floor penetration plate
The attic floor penetration plate (D) is optional. When an
insulated attic floor penetration plate is used, the airtightness of
the vapour barrier must be ensured.
The attic floor penetration plate is installed at the same level as
the rear wall of the ventilation unit. The minimum distance of the
attic floor penetration plate from the rear wall is 10 mm and from
the finished side walls 15 mm.
B
B
2
A
D
A
1
3
5
4

9© Vallox Oy - All rights reserved
INSTALLATION
REMOVAL OF CONDENSING WATER
Dimensioning figures and space required for
installation of the Vallox Silent Klick siphon
MEASURING AND ADJUSTING THE AIR
FLOWS OF THE VENTILATION UNIT
The accessories delivered with the unit include four (4) air flow
measuring tubes. These can be inserted in the ducts to allow for
easier ventilation adjustment.
NOTE
The Vallox Silent Klick
siphon package is
delivered with the unit.
Installation instructions
for the siphon are
enclosed with the
packaging, and can
also be found online at
www.vallox.com. When
the alternative siphon
installation method is
used, the ring seal and
the locking part must
be moved to the pipe
connection part that is
mounted on the wall.
Space required by the alternative Vallox Silent Klick
siphon installation method (elbow)
92
1
Ø6
16
598
525
51
576
170 170
294 294
L R
75
38

10
153
378
493
211
387
105
522
1
2
4
3
160
L
105
153
378
493
211
387
105
522
1
2 3
4
160
R
Dimensions and duct outlets
INSTALLATION
L-model R-model
125B
L-model R-model
82
227
372
517
400
230
522
123 4
123 4
125
493
105
82
227
372
517
400
230
522
1 2 34
1 2 34
125
85
230
372
512
299
131
215
522
493
12
3 4
12
125
125A
105
601
512
367
224
85
131
299
215
522
1 2
34
1 2
125
601
525
L-model R-model
598
525
51
602
17
26
598
525
51
602
26
17
Duct outlets
The inner diameter
of the female outlet
collar is 125 or 160
mm, depending on
the model.
1. Supply air from
the unit to the
apartment
2. Extract air from
the apartment to
the unit
3. Exhaust air
flowing outdoors
from the unit
4. Outdoor air to
the unit
R-modelL-model
125C

11 © Vallox Oy - All rights reserved
R
91
241
346
496
252
102
522
105
1 2
43
125
125
L
102
252
357
507
252
102
522
493
1
2
4
3
INSTALLATION
L-model R-model
125E
L-model R-model
125F
L-model R-model
125D
492
361
236
105
173
384
522
4
3
160
493
2
1
105
492
361
236
105
173
384
522
1
2 3
4
160
122
242
501
381
217
97
522
1
2
3
4
125
493
105
122
242
501
381
217
97
522
1
2
3
4
125
96
358
491
222
404
310
230
148
522
493
1
2
3
4
160
105
160
502
376
240
107
230
148
404 310
522
1
2
3
4
L-model
125G
R-model

12
BEFORE BEGINNING
MAINTENANCE WORK
The safety switch (S) automatically turns o the power
when the door of the unit is opened.
WARNING
Always disconnect the power plug before starting
the ventilation unit maintenance.
There is a left-handed (L) and right-handed (R) version of
each model. The figure shows the right-handed model.
REPLACING THE FILTERS
When the maintenance reminder becomes activated,
check the cleanliness of the filters and replace them if
required.
The Vallox ventilation unit has three air filters:
• Coarse filter for supply air filters insects, heavy pollen
and other relatively large foreign objects out of the
outdoor air.
• Fine filter for supply air filters microscopic pollen and
dust particles out of the supply air.
• Coarse filter for extract air filters the extract air and
keeps the heat recovery cell clean.
The filter replacement interval depends on the ambient
particle concentration. It is recommended that the filters
be replaced every spring and autumn, or, at the very least,
once a year.
To replace the filters:
1. Disconnect the ventilation unit from the mains
electricity supply.
2. Lift o the door cover panel. Undo the unit’s mounting
screws (4 mm hexagon).
3. Lift the door o.
4. Remove the old filters (A, B, C) and discard them.
CAUTION
The door is heavy.
5. Install the new filters (A, B, C).
6. Close the door of the unit. Ensure that the safety
switch catch of the door is engaged (S), allowing the
unit to be turned on.
7. Plug the ventilation unit back into the mains.
The filters have now been successfully replaced.
TIP
Using original Vallox
filters ensures that the
ventilation unit remains
in top condition,
giving the best results.
Selection and ordering
of filter packages:
filters.vallox.com
MAINTENANCE
MAINTENANCE
NOTE
The service space in
front of the ventilation
unit must be at least
500 mm.
IMPORTANT
If the power cord
is damaged, the
manufacturer, its
service representative
or other person with
similar qualifications
must replace it to avoid
danger.
B
A
C
S

13 © Vallox Oy - All rights reserved
CLEANING THE HEAT RECOVERY CELL
Check that the heat recovery cell is clean roughly once a year,
or whenever the filters are being replaced. Clean by washing
as required.
To check and clean the heat recovery cell:
1. Disconnect the ventilation unit from the mains electricity
supply.
2. Lift o the door cover panel. Undo the unit’s mounting
screws (4 mm hexagon).
3. Lift the door o.
CAUTION
The door is heavy.
4. Turn the upper support of the cell (A) to the upper position
(the R model: clockwise; the L model: anti-clockwise).
5. Remove the extract air filter (B).
6. Lift and pull the HR cell (D) out of the unit.
7. If the cell is dirty, clean it by immersing it in warm water, to
which a small amount of a mild detergent has been added.
8. Rinse the cell clean with a water spray. Do not use a high-
pressure cleaner.
9. When all the water has drained from between the layers,
reassemble the ventilation unit as follows:
10. Ensure that the lower support (C) is in place against the
knobs at the bottom of the unit.
11. Lift the HR cell in place.
12. Turn the upper support (A) against the cell. Ensure that the
upper support is properly nestled against the cell (remains
upright).
13. Install the extract air filter (B) in place.
14. Close the door. Ensure that the safety switch catch of the
door is touching the safety switch.
15. Plug the ventilation unit back into the mains.
The heat recovery cell has now been checked and
cleaned.
MAINTENANCE
IMPORTANT
Handle the cell
carefully! For example,
do not lift the cell by the
layers. The cell layers
are very thin and easily
damaged.
CONDENSING WATER
In the heating season, the extract air humidity condenses to
water. In new buildings, the volume of condensing water can be
high. Condensed water must be able to freely leave the unit.
At some time before the heating season begins (e.g. during
autumn maintenance), check that the siphon or the condensing
water outlet in the bottom pool are not clogged. To check this,
pour some water into the pool. Clean as required.
NOTE
Some condensing water
may have accumulated
in the bottom pool
of the unit; this is
normal and requires no
corrective action.
WARNING
Water must at all times
be kept out of the
electrical system.
B
A
D
C

14
CLEANING THE FANS
Check the cleanliness of the fans when servicing the filters
and the heat recovery cell. Clean the fans as required.
You can clean the fan blades with compressed air (wear
protective goggles) or by brushing them gently. Do not
remove or move the fan blade balancing weights.
To clean the fan:
1. Disconnect the ventilation unit from the mains electricity
supply.
2. Lift o the door cover panel. Undo the unit’s mounting
screws (4 mm hexagon).
3. Lift the door o.
CAUTION
The door is heavy.
4. Remove the filters and the heat recovery cell. See
chapters “Replacing the filters” and “Cleaning the heat
recovery cell”.
5. Remove the support plate (F) by undoing the screws (E).
6. Detach the bypass module (G) cable from the connector
(found in front of the extract fan (P)). Pull the bypass
module (G) out of the unit.
7. Remove the plastic nuts used to fasten the fans (J) (2 per
fan). Remove the two wing screws (I) of the post-heating
resistor (H) (only when changing the supply air fan) and
remove the cable of the resistor (H) from the connector.
8. Remove the fan from the unit by lowering it before
turning the fan anti-clockwise, whilst tilting it. Remove the
control grille by undoing the screws (4 pcs).
9. You can now clean the fan. Put the control grille (S) back
in place after cleaning.
10. Reassemble in reverse order after cleaning. After
reassembling the fan, ensure that the rubber feedthrough
(M) is in place.
11. Close the door. Ensure that the safety switch catch of the
door is touching the safety switch.
12. Plug the ventilation unit back into the mains.
The fan has now been checked and cleaned.
MAINTENANCE
H
J
S
T
M
P
I

15 © Vallox Oy - All rights reserved
036 72 108 144 180 216 252 288 324 360 396 432 468
0
100
200
300
400
500
020 40 60 80 100 120
m ³/ h
dm³/s (l/s)
100%
80%
70%
60%
50%
40%
30%
20%
10%
SFP 1,8
SFP 1,5
SFP 1,2
SFP 1,0
036 72 108 144 180 216 252 288 324 360 396 432 468
0
50
100
150
200
250
300
350
020 40 60 80 100 120
m ³/ h
dm³/s (l/s)
100%
80%
70%
60%
50%
40%
30%
20%
10%
TECHNICAL SPECIFICATIONS
THE FAN’S SUPPLY AND EXTRACT AIR VOLUMES AND SPECIFIC ELECTRICITY CONSUMPTION
Input power (total) (W)
Air flow (max) (dm3/s)
SFP =
SFP rate (Specific Fan Power)
recommended value <1.8 (kW m3/s)
extract air
supply air
Volume flow rate
Pressure loss in the ducts. Total pressure (Pa)
Volume flow rate (dm3/s)
Power (W)
FAN INPUT POWER
TECHNICAL SPECIFICATIONS
Product title
Vallox 125 MV R
Vallox 125 MV L
Air volumes
Supply air
Extract air
111 dm3/s, 100 Pa
127 dm3/s, 100 Pa
Fans
Supply air
Extract air
0.165 kW 1.35 A EC
0.165 kW 1.35 A EC
Post-heating Electrical resistor, 900 W Electrical connection 230 V, 50 Hz 9.3 A power plug
Pre-heating –Enclosure protection class IP 34
Additional heating Electrical resistor, 900 W Heat recovery bypass Automatic
Filters
Supply air
Extract air
ISO Coarse > 75 % + ISO ePM₁
ISO Coarse > 75 %
Specific energy consumption (SEC)
in a cold climate
in a temperate climate
A+
A
Operating eciencies*
Annual eciency
Supply air eciency
Specific Fan Power (SFP)
74 %
76 %
1.52 kW/m3/h (77 dm3/s)
Dimensions (w x h x d) 598 x 525 x 601 mm Weight 58.5 kg
*Working point defined in the Ecodesign Directive (2009/125/EC), Southern Finland, Helsinki-Vantaa TRY year 2012.

16
TECHNICAL SPECIFICATIONS
You can calculate the sound values for each operating point with the Vallox MySelecta software.
Sound power level in the supply air duct (one duct)
by octave band Lw, dB
Sound power level in the extract air duct (one duct)
by octave band Lw, dB
Adjustment position Adjustment position
Adjustment position (%) 10 20 30 40 50 60 70 80 100 10 20 30 40 50 60 70 80 100
Medium
frequency
of the
octave band
Hz
63 84 84 81 80 79 73 73 68 61 82 82 81 79 78 74 69 66 56
125 81 80 74 72 71 68 65 64 57 78 78 72 69 67 64 62 58 48
250 74 74 73 71 69 67 65 71 57 68 68 67 66 64 61 58 55 46
500 76 75 70 64 62 60 63 58 43 56 56 54 52 56 49 46 43 30
1000 70 70 67 67 64 61 58 54 43 50 50 48 47 45 42 39 35 24
2000 64 64 62 59 57 54 51 47 33 44 44 43 41 39 35 32 27 16
4000 59 59 57 55 53 49 45 40 23 37 37 36 34 31 28 24 20 16
8000 55 55 53 50 47 43 38 32 21 32 32 30 28 25 23 21 20 20
LW,dB
LWA, dB(A)
87 86 82 81 81 76 75 73 64 84 83 82 80 78 75 70 67 57
76 75 72 70 68 65 64 64 51 65 65 62 60 59 56 53 49 40
Sound pressure level coming through the envelope of the unit in the room in which it is installed (10m² sound absorption)
Adjustment position
Adjustment position (%) 10 20 30 40 50 60 70 80 100
LpA, dB (A) 26 30 36 41 43 44 45 47 47
SOUND VALUES

17 © Vallox Oy - All rights reserved
TECHNICAL SPECIFICATIONS
INTERNAL ELECTRICAL CONNECTION
BK Black
BU Blue
BN Brown
WT White
GY Grey
YE Yellow
YEGN Yellow-green
CABLE COLOURS
AMotherboard
B
1. Extract air fan tacho (WT)
2. GND (GN)
3. Extract air fan PWM (YE)
4. Supply air fan tacho (WT)
5. GND (GN)
6. Supply air fan PWM (YE)
C
1. Extract air
2. Outdoor air
3. Supply air
4. Exhaust air
5. Supply air from the HR cell
DLAN
MB_A External Modbus A signal
MB_B External Modbus B signal
+24V +24V voltage (DC)
GND Digital and analog ground potential
RS_A Local hardware Modbus A signal
RS_B Local hardware Modbus B signal
NTC External temperature sensor connector
D/I1 Digital input 1
D/I2 Digital input 2
11V1 11.1 V operating voltage
AN/I Analog input 0-10VDC
RM/I 24V relay input
RM/O 24V relay output
TSupply air fan
PExtract air fan
MDamper motor
TK Safety switch
AHS Post-heating control
%RH Internal humidity sensor
%RH CO2Internal humidity and carbon dioxide
sensor
R1
R2
Post-heating resistor with 90°C and
130°C overheating protection
Post-heating resistor with 90°C and
130°C overheating protection
KHarmonic filter
230V 50Hz
TK
1 2 3 4 5 6
90°C
TESTER
130°C
T1
T2
R1
NTC
GND
D/I1
BN
P
T
WT
2
3
1
YEGN
YEGN
YEGN
BN
BU
BN
BU
YEGN
BU
YEGN
YE
GN
D/I2
WT
YE
GN
+11V1
RH% CO2
RH%
AHS
MB_B
MB_A MB_A
MB_B
+24V
RS_A
RS_B
GND
AN/I
GND
+24V
RS_A
RS_B
GND
RM/I
RM/O
+24V
+24V
+24V
RS_A
+24V
RS_A
RS_B
GND
RS_B
GND
YEGN
BN
BU
BN
BN
BU
BU
L
N
L
N
L
N
L
N
M
T2
T1
130°C 90°C
R2
BU
BN
1
5
4
3
2
A
D
B
C

18
TECHNICAL SPECIFICATIONS
EXTERNAL ELECTRICAL CONNECTION
3x1,5S
2x2x0,5+0,5
2x0,5
2x0,5
7028350
2014-08-29 JS
2x2x0,5+0,5
2x0,5
2x2x0,5+0,5
2x2x0,5+0,5
2x2x0,5+0,5
2x0,5
2x0,5
CAT
Analog input
two dierent
functions
Potential-free contact
data 24VDC can be
programmed to display
information such as errors
or to control the valve
and pump of the MLV
radiator.
Plug connection
1.2 m on top of the unit
REMOTE
MONITORING
Modbus RTU
VENTILATION UNIT INTERNAL
ELECTRICAL CONNECTION
MyVallox
%RH
sensor
MyVallox
CO2
sensor
External
temperature
sensor
NTC 4K7
Digital input 1
8 dierent
functions
Digital input 2
8 dierent
functions
Ethernet connection
on top of the unit
RJ45 female
0.3W
1.2W
1W
1W
MyVallox
VOC
sensor
2W MyVallox
control
panel
MyVallox
control
panel
MB_A External Modbus A signal D/I1 Digital input 1
Maximum ≤6W MB_B External Modbus B signal D/I2 Digital input 2
MyVallox Control 1W +24V +24V voltage (DC) 11V1 11.1 V operating voltage
MyVallox Touch 0.5 W. GND Digital and analog ground potential AN/I Analog input 0-10VDC
MyVallox %RH sensor 0.3W RS_A Local hardware Modbus A signal RM/I 24V relay input
MyVallox COsensor 1.2W RS_B Local hardware Modbus B signal RM/O 24V relay output
MyVallox VOC sensor 2W NTC External temperature sensor connector
Voltage 24 VDC
POWER SUPPLY

19 © Vallox Oy - All rights reserved
TECHNICAL SPECIFICATIONS
3x1,5S
2x0,5
L
+24VDC
CAT
GND
P V
L N
1 2
N
2x0,5
Ethernet
connection
on top of the unit
RJ45 Female
Plug connection
1.2 m on top of the unit
24 VDC relay/
contactor for
controlling the pump
and solenoid valve
VENTILATION UNIT INTERNAL
ELECTRICAL CONNECTION
Distribution
board
MLV control
External
temperature
sensor
NTC 4K7
MB_A External Modbus A signal
MB_B External Modbus B signal
+24V +24V voltage (DC)
GND Digital and analog ground potential
RS_A Local hardware Modbus A signal
RS_B Local hardware Modbus B signal
NTC External temperature sensor connector
D/I1 Digital input 1
D/I2 Digital input 2
11V1 11.1 V operating voltage
AN/I Analog input 0-10VDC
RM/I 24V relay input
RM/O 24V relay output
PCirculation pump
VSolenoid valve
EXTERNAL ELECTRICAL CONNECTION
FOR CONTROLLING THE MLV DUCT
RADIATOR

20
TECHNICAL SPECIFICATIONS
Always follow first and foremost the connection diagram
provided by the HVAC designer or heat pump manufacturer.
Also read the duct radiator manual.
The accompanying figure shows an example of the
arrangement for connecting the heating/cooling radiator unit
to the heat collection circuit.
Connect the radiator output pipe to the heat collection circuit
return pipe. Direct the fluid returning from the radiator unit to
the heat collection circuit return pipe. If you know that there
is a large loss of internal pressure inside the heat pump, the
heat pump should be bypassed. If this is done, the fluid circuit
will come into operation when the heat pump comes to a halt.
When this happens the pressure loss in the one-way bypass
valve Y2 must be lower than the pressure loss in the heat
pump.
Heating: The pump starts when the outdoor air temperature
drops below the winter limit value set at the factory (-5 °C).
Cooling The supply air setpoint value for the active mode
(for example, At home) controls the pump start-up. The pump
starts when the supply air setting is below the temperature of
the supply air that is blown into the apartment.
The duct radiator can be installed in both the supply air
duct and the outdoor air duct. If the radiator is installed in
the outdoor air duct, it can be used for both preheating and
cooling. If the radiator is installed in the supply air duct, it can
be used for heating or for cooling only.
The duct radiator can be set to function either automatically or
manually.
• Automatic - In summer, the supply air temperature will
be maintained at the level specified in the temperature
setting. In winter, the duct radiator will turn on, when the
outdoor temperature falls below the winter setting.
• Manual - In summer, the duct radiator will turn on, when
the outdoor temperature rises above the summer setting.
In winter, the duct radiator will turn on, when the outdoor
temperature falls below the winter setting.
To prevent the risk of condensation in the supply air duct, you
can set the adjustment of the supply air limit to automatic or
manual.
• Automatic - The supply air limit is adjusted automatically
based on the dew point of the extract air. When the supply
air temperature falls too low, the duct radiator will turn o.
• Manual - The supply air limit can be set manually. When
the supply air temperature falls down to the set value, the
duct radiator will turn o.
If an external sensor is in use, it is selected from the settings of
the external sensor whether it is used to control the outdoor air
duct radiator or the supply air duct radiator. The temperature of
the external sensor can be read from the service menu: menu
> service menu > unit information page 5 ”External sensor”.
NOTE: If the duct
radiator is used in
the supply air duct, it
can only be used for
cooling.
NOTE: When used to
control the outdoor air
duct radiator, the exter-
nal NTC sensor is ins-
talled in the outdoor air
duct before the radiator.
When used to control
the supply air duct ra-
diator, the external NTC
sensor is installed after
the radiator.
NOTE:
When selecting the
relay (C), take account
of the maximum
allowed combined
power supply (6W) of
the circuit board in the
external MV electrical
box, if the relay power
supply comes from the
circuit board’s +24V
connector.
NOTE:
Due to the risk of humi-
dity damage, in a duct
that has not been insu-
lated for condensation
the supply air tempera-
ture must not fall below
+16 … 20 °C.
DUCT RADIATOR OPERATION