Vallox DIGIT2 SE VKL Owner's manual

Low-energy ventilation unit
with heat recovery
© Vallox
1.09.391 E
Valid from:
1.9.2014
1 Extract air fan
210 W/0.92 A,
alternating current (AC)
2 Supply air fan
210 W/0.92 A,
alternating current (AC)
3 Electrical quick-connect terminal
for fan
4 Preheating unit
(electric 1.2 kW, or liquid)
5 Post-heating unit
(electric 1.2 kW, or water)
6 Heat recovery cell
7 Outdoor air filter F7
8 Outdoor and extract air prefilter
G4
9 Summer/winter damper
10 Maintenance switch
11 Connection box cover plate
12 Self-actuated one-way dampers
(only in VKL and MLV models)
13 Plug 1.8 m
14 Control panel
15 Humidity sensor (option)
16 CO2sensor (option)
17 LON converter (option)
18 Air flow measurement outlets
(behind cover plate)
19 Water radiator actuator/valve
20 Connection ø12
21 MLV connection ø10 Cu
Code
A3550 SE
Models
VALLOX Digit2 SE R
VALLOX Digit2 SE L
Operating, maintenance and technical instructions
14
15 16
17
4
21
18
8
11
7
10
3
13
2
9
4
1
6
20
5
19
12
The letter L or R after the name of the unit indicates whether the unit is left- or right-handed.
The figure shows the R model of VALLOX DIGIT2 SE (electric radiator model).
VKL/MLV units:
Vallox
SE
Digit2
VALLOX DIGIT2 SE models
Code: A3550 SE
VALLOX DIGIT2 SE
• Preheating radiator: electric, 1200 W
• Post-heating radiator: electric, 1200 W
VALLOX DIGIT2 SE VKL
• Preheating radiator: electric, 1200 W
• Post-heating radiator: VKL water radiator
VALLOX DIGIT2 SE MLV VKL
• Preheating radiator: MLV liquid radiator
• Post-heating radiator: VKL water radiator
VALLOX DIGIT2 SE MLV electric
• Preheating radiator: MLV liquid radiator
• Post-heating radiator: electric, 1200 W
5

2
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
OPERATING INSTRUCTIONS
Operating instructions
VALLOX Digit2 SE
For indoor air to stay healthy and beneficial also for the structures
of the dwelling, ventilation has to be in operation continuously. It is
not advisable to stop ventilation even for longer holidays because
it makes indoor air stuffy. Also, during the heating season indoor
air humidity may condense in the ducts and structures and therefore
cause humidity damage. The sensors automatically adjust ventilation
to an optimal level even if the dwelling is empty.
Making the unit ready for operation
1. Connect the plug to the mains supply. VALLOX Digit2 SE is now
ready for operation.
2. Start the unit and choose a suitable ventilation power at the
control panel. There is either one or more control panels. See
the operating instructions for control panel.
In normal conditions basic ventilation, with a change of air every
two hours, is sufficient in living areas. Boosting is needed during for
example sauna baths, cooking, clothes washing or family parties.
If carbon dioxide and/or humidity sensors have been installed in
the system, VALLOX Digit2 SE automatically takes care of demand-
controlled ventilation.
Ventilation control
The unit can be controlled with a control panel. The standard week-
clock control can be used to control the fan power of the unit and
the setpoint for supply air temperature.
Furthermore, demand-controlled ventilation can be adjusted with
optional carbon dioxide and humidity sensors.
The fan power of the unit can also be controlled with a voltage
signal.
Controlling ventilation with
Vallox Digit SED control panel
The control panel can be used for the
following ventilation control functions:
Functions for adjusting ventilation
power
• Starting and stopping.
• Power adjustment (8 positions).
• Setting of base fan speed and maximum fan
speed.
Ventilation power cannot be set lower than the base fan speed.
When carbon dioxide and/or relative humidity adjustments are
activated, power cannot be adjusted higher than the maximum fan
speed. When humidity and carbon dioxide adjustments have been
switched off, fan speed can be raised to speed 8.
Controlling ventilation with voltage signal
• VALLOX Digit2 SE fan power can be controlled with a voltage
signal coming from remote monitoring.
• The signal can be used to select speeds 0 to 8. However,
if carbon dioxide or humidity adjustment is enabled, the
maximum fan speed cannot be exceeded.
• The signal changes the base fan speed.
• The signal does not lock fan speed. In other words, fan speed
can be changed at the control panel within the limits set.
Carbon dioxide and humidity adjustment also operate within
the limits set.
Voltage signal values
Voltage values for each fan speed:
0 0.20...1.25 VDC
1 1.75...2.25 VDC
2 2.75...3.25 VDC
3 3.75...4.25 VDC
4 4.75...5.25 VDC
5 5.75...6.25 VDC
6 6.75...7.25 VDC
7 7.75...8.25 VDC
8 8.75...10.00 VDC
Electrical connection 230 V, 50 Hz
Degree of protection provided by enclosures IP 34
Fans Extract air 210 W, 0.91 A (AC) 120 dm3/s (120 Pa)
Supply air 210 W, 0.91 A (AC) 110 dm3/s (100 Pa)
Heat recovery Cross- flow heat recovery cell, > 60%
VALLOX DIGIT2 SE 2.7 kW, 12.0 A
Preheating unit Electric, 1200 W, 5.2 A
Post-heating unit Electric, 1200 W, 5.2 A
VALLOX DIGIT2 SE VKL 1.55 kW, 6.7 A
Preheating unit Electric, 1200 W, 5.2 A
Post-heating unit VKL water radiator
VALLOX DIGIT2 SE MLV VKL 0.35 kW, 1.5 A
Preheating unit MLV liquid radiator
Post-heating unit VKL water radiator
VALLOX DIGIT2 SE MLV electric 1.55 kW, 6.7 A
Preheating unit MLV liquid radiator
Post-heating unit Electric, 1200 W, 5.2 A
Filters Supply air G4 and F7
Extract air G4
Weight 71 kg
Ventilation adjustment options Control panel control
Week-clock control
CO2and %RH control (option)
Options CO2sensor
%RH sensor
Filter guard (supply and/or extract air)
LON converter
Ceiling mounting
Attic floor penetration
Silencer unit
VKL expansion tank + stand
VKL heat exchanger pipe
TECHNICAL DATA

3
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
OPERATING INSTRUCTIONS
Adjustment of supply air temperature and
summer/winter function
The temperature of air coming to the dwelling can be adjusted
between circa +10 °C and +30 °C. When there is a light on the
post-heating indicator (see picture below), post-heating is activated
and the unit heats air as needed. The need for heating depends on
the setpoint of supply air temperature.
When there is no light on the post-heating indicator, post-heating
is off. This means that the summer function is activated for the
ventilation unit. The unit has a motorised summer/winter function.
When the summer function is on, the heat recovery cell is bypassed
as soon as outdoor air temperature has risen above the setpoint.
See the setpoint for cell bypass; factory setting is +12 ºC. When
outdoor air temperature goes below the setpoint (factory setting
+12 °C), the unit starts to recover heat. If there is water-circulating
post-heating in the unit, supply air finds the desired value very slowly.
It takes hours for the unit to reach the correct setpoint. The amount
of time depends on the temperature of the liquid circulating in the
post-heating radiator.
Two different kinds of supply air temperature adjustment can be
chosen at the unit: constant temperature control or cascade control.
In constant temperature control, the unit controls the temperature of
supply air directly in accordance with the measurement information
on the temperature of supply air blown to the ventilation area. In
cascade control, the unit controls supply air temperature according
to the temperature of air extracted from the ventilation area. The unit
calculates the difference between the air extracted and the setpoint
for supply air and uses this difference to control the need for post-
heating.
Remember!
Switch post-heating off when it starts to get too warm in the
dwelling because of warm weathers.
Switch post-heating on again when it gets cooler in autumn.
Post-heating indicator light
Maintenance reminder
symbol
Maintenance reminder
• The maintenance reminder switches on the maintenance
reminder symbol ( ) on the main display of the control
panel at defined intervals. The factory setting is 4 months.
• The maintenance reminder symbol is acknowledged at
the main display of the control panel. (See the operating
instructions for control panel, section 3.1.)
• The interval can be set between 1 and 15 months at the
control panel.
Ventilation control with carbon dioxide sensor
(option)
• In carbon dioxide control, VALLOX Digit2 SE adjusts fan speed
so as to keep carbon dioxide content in the ventilation zone
below the setpoint. When two or more sensors are used, fan
speed is adjusted according to the highest measuring result.
• 1...5 carbon dioxide sensors can be connected as options to
the VALLOX Digit2 SE unit.
• The adjustment is switched on/off and, if needed, the setpoint
(500...2000 ppm) is set at the control panel. The factory
setting is 900 ppm. The recommended maximum carbon
dioxide content in good indoor air is circa 1,000 ppm.
• When this control is on, the control panel may be used to raise
fan speed to the maximum fan speed and to decrease it to the
base fan speed. In carbon dioxide control, maximum fan speed
limitation is enabled.
Controlling ventilation with humidity sensor
(option)
There are two modes of adjusting fan speed.
1 Automatic humidity setting, which is suitable for controlling
humidity for instance in washing rooms.
The program records current humidity level and selects it as
the setpoint, which it then uses as the target for drying air
for instance after a shower in the bathroom. The setpoint
automatically varies for instance according to season and is
always at the right level. This setting is factory selected.
2 Humidity level can also be set fixed. The setting can range
between 1 and 99 %RH and is set at the control panel. This
can be used for instance in public saunas and swimming pools.
The program aims at keeping humidity at the setpoint. The
setpoint can be changed if needed. The mode of adjustment
is chosen at the controller. Recommended humidity content of
good indoor air is approximately 45%.
• When this control is on, the control panel may be used to raise
fan speed to the maximum fan speed and to decrease it to the
base fan speed.
• In humidity control, fan speed varies between the base and
maximum fan speeds selected.
• When the unit is  rst taken into use with automatic setpoint
search enabled (factory setting), it takes 3 to 10 hours for
the program to define the value. During this time, humidity
adjustment is not enabled (because the first value, selected at
the factory, is 100%).
• Automatic search is enabled even if humidity control is not
selected.

4
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
Liquid-circulating preheating and
precooling
• Setting control temperature (-6 °C... + 15 °C, outdoor air)
for the heating function in the liquid-circulating preheating unit
(MLV model). The function is on when outdoor temperature
goes below the setpoint temperature and when post-heating
is on (see the operating instructions for control panel, section
3.19.).
The temperature value must be lower than the temperature
of the liquid coming from the ground collector. When this is
the case, the liquid is used to heat outdoor air. If preheating
cannot keep exhaust air temperature warmer than the stopping
temperature, the outdoor air fan stops.
• Setting control temperature (+10 °C...+30 °C, supply air) for
cooling in the liquid-circulating preheating unit (MLV model).
The cooling function starts when the post-heating radiator has
been switched off and the temperature of air coming from the
unit to the dwelling exceeds the setpoint for supply air. (See the
operating instructions for control panel, section 2.6.). When
choosing the setpoint for supply air, care must be taken so as
not to bring too cold air into the duct, which causes humidity
damage. The risk is small when the ground collectors of the
heat pump are situated in the ground or in a water system and
the liquid received from them is warmer in summer than the
liquid circulating in a drilled well.
If the duct is not insulated against condensation indoors, the
temperature of air travelling in it must be confined to below the
dew point, which depends on the ambient temperature and
relative humidity. In hot weather, supply air temperature should
not go below +16…+20 °C.
Fireplace switch function/boosting
Fireplace switch function
• The  replace switch stops the extract air fan for 15 minutes and
produces overpressure in the ventilation zone. This makes it
easier to for instance light a fireplace.
• The function is started on the main display of the control panel
by simultaneously pressing and holding down the + and -
buttons for 2 seconds.
• The function can also be started at a separate auto-reset push-
button switch, wired from the connection box of the unit for
example to a wall in the fireplace room. Upon each pressing,
the stopping function continues for 15 minutes (the switch is not
included in the delivery).
• During the function, the  replace/booster switch symbol ( ) is
visible in the main display of the control panel.
NOTE! The starting of the extract air fan may weaken draught in the
fireplace! In winter, this situation may disturb the winter function of the
unit. The situation will normalise in a while, after the fireplace function
stops.
Boosting switch function
• The booster switch function raises fan speed to the set maximum
fan speed for 45 minutes.
• The function is started on the main display of the control panel
by simultaneously pressing and holding down the + and -
buttons for 2 seconds.
• The function can also be started at a separate auto-reset push-
button switch, wired from the connection box of the unit to
for instance a wall in a classroom. Upon each pressing, the
boosting function continues for 45 minutes.
• During the function, the  replace/booster switch symbol () is
visible in the main display of the control panel.
• The function is chosen at the control panel.
Fireplace/booster switch
symbol
Fault signal relay (remote monitoring)
• The fault signal relay has potential-free contacts (24 VDC,
1 A).
• The contacts provide information on faulty states of the unit.
• Alarm of high carbon dioxide content switches the relay at
1-second intervals.
• In other fault situations, the contacts are closed.
OPERATING INSTRUCTIONS

5
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
OPERATING INSTRUCTIONS FOR CONTROL PANEL
Start button
Press the button to turn the ventilation unit on and off.
When the indicator is lit, the unit is on.
Carbon dioxide adjustment
Press the button to turn carbon dioxide adjustment on
and off. When the indicator is lit, the adjustment is on.
Humidity adjustment
Press the button to turn humidity adjustment on and off.
When the indicator is lit, the adjustment is on.
Post-heating
Press the button to turn post-heating on and off. The
summer function is on when the indicator is not lit.
Scrolling up
With this button you can scroll the displays upward.
Scrolling down
With this button you can scroll the displays downward.
Increase button
Use this button to increase values.
Decrease button
Use this button to decrease values.
3
4
15
6
7
8
1.1 Keyboard
2
Power failure
After a power failure, the unit starts at minimum fan
speed. The adjustments and setpoints chosen will remain
in the memory of the unit in spite of the power failure.
Main display
Fan speed (3).
Supply air temperature (21°C).
Time.
Filter guard alarm.
Maintenance reminder alarm.
Fireplace/booster switch on. The fireplace/booster switch is
activated in this display by simultaneously pressing down the
+ and – buttons for 2 seconds.
Week-clock control on.
Fan speed can be changed in this display with the + and –
buttons (see section 1.1, figure items 7 and 8).
3
21
10:20
Ventilation operating menus
Main display
2.1. Main display and change of fan speed 2.2 Moving to the Settings menu
To settings menu
see manual
I
n order to move to the Settings menu,
press the + and – buttons simultaneous-
ly. In the Settings menu you can chan-
ge setpoints for the ventilation unit.
2.3 Week-clock control
Week program
on
Week-clock control can be switched
on with the + button and off with the –
button. Week-clock control is on when
the week-clock control symbol is in the
main display. In week clock control,
the base fan speed and supply air
temperature of the unit are adjusted in
accordance with the programme as
described in section 4.1.
2.4 Content display
RH 35% RH2 40%
CO2 0821 PPM
The content display shows humidity
and carbon dioxide content. The
corresponding sensors are required
(options).
2.5 Temperature display
Out 20 in 20
Sup. 20 Exh. 20
The temperature display shows the
temperatures of outdoor air, indoor
air, supply air and exhaust air. The
accuracy of the temperature sensors
is ±2 °C.
2.6 Setting supply air temperature
Temp. setting
20C
Supply air temperature is changed
with the + and – buttons.
1. Control panel operation
2. Operating menu
3. Settings menu You can move to the Settings menu from the Operating menu as described in section 2.2
The displays of the Settings menu (sections 3.1–3.29) can be scrolled with the scrolling buttons (see section 1.,
items 5 and 6 in the figure).
3.1 Resetting maintenance reminder
Mainten. reset
Press + and –
The maintenance reminder is reset
by pressing the + and – buttons
simultaneously. This turns out the
maintenance reminder symbol ( ) in
the main display.
3.2 Choosing maintenance reminder interval
Maintenance rem.
04
The interval for the maintenance
reminder is selected with the + and
– buttons. The maintenance reminder
interval refers to months.
1
21C 10:20
The displays of the Operating menu (sections 2.1–2.6) can be scrolled with the scrolling buttons
(see section 1, figure items 5 and 6).

6
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
OPERATING INSTRUCTIONS FOR CONTROL PANEL
3.3 Choosing language version
Kieli / Language
English
The desired language is chosen with
the + and – buttons.
3.4 Adjusting time
Adjust time
Press + and -
You can adjust time by simultaneously
pressing the + and – buttons. See
separate instructions in 4.2.
3.5 Week programme programming
Adjust wk. prog.
Press + and -
To go to the week-clock programme
programming mode press the +
and – buttons simultaneously. See the
instructions in 4.1.
3.6 Erasing week programme
Erase wk. prog.
Press + and -
You can totally erase the week
programme by pressing the + and –
buttons simultaneously.
3.7 Choosing basic humidity level
Rh-level setting
automatic
The basic humidity level can be
chosen as either automatic or manual.
The selection is done with the + and
– buttons.
3.8 Basic humidity level setpoint
Basic %RH level
40%
The desired setpoint is chosen with
the + and – buttons when manual
adjustment has been selected as
the Rh level setting (humidity setting,
section 3.7).
3.9 Changing setpoint for carbon dioxide adjustment
CO2 setting
0900 PPM
The setpoint for CO2adjustment is
chosen with the + and – buttons.
3.10 Adjustment interval
Adjust interval
10
The adjustment interval for humidity
and carbon dioxide adjustments is
selected with the + and – buttons. The
adjustment interval refers to minutes.
3.11 Changing operating temperature of
heat recovery cell bypass
Cell bypass
10C
The desired cell bypass temperature
is selected with the + and – buttons.
If outdoor temperature is lower than
cell bypass temperature, the summer/
winter damper is in the winter position.
3.12 Mode of operation of fireplace/booster switch
Switch type
fireplace switch
The mode of operation of the switch
(either fireplace or booster switch) is
selected with the + and – buttons.
3.13 Address of control panel
Panel address
1
The address of the control panel is
changed with the + and – buttons. Two
control panels cannot have the same
address. If control panels have the
same address, they go to bus fault state
and do not work.
3.14 Contrast of control panel display
Display contrast
05
The contrast setting for the control panel
display is changed with the + and –
buttons.
3.15 Restoring factory settings
Factory settings
see manual
The general factory settings can be
restored by pressing the + and – buttons
simultaneously. Remember to ensure that
the setpoints are in accordance with the
factory settings for this unit.
3.16 Choosing cascade adjustment for supply air temperature
Cascade adjust
off
Cascade adjustment is chosen to be on
or off with the + and – buttons.
3.17 Choosing post-heating for the unit
Radiator type
Electric rad.
A water or electric radiator is selected
with the + and – buttons, depending on
the type of post-heating radiator the unit
is equipped with.
Note! Choosing the wrong type of
post-heating may cause a faulty post-
heating function.
3.18 Choosing additional heater for unit
Extraheater type
MLV radiator
An electric or MLV radiator is chosen
according to ventilation unit type with
the + and – buttons.
3.19. Selection of setpoints for preheating resistor or MLV radiator
Preheater
07 C
MLV winter temp
DC
Electric model
The temperature of the preheating
resistor for the antifrost function in the
heat recovery cell is chosen with the +
and – buttons.
MLV model
Choose a suitable outdoor temperature
in which the preheating radiator is on.
(Note! temperature < temperature of the
liquid circulating in the radiator).
3.20. Choosing melting mode
Defrost mode
fan stop
NOTE! The FAN STOPPING
FUNCTION must be always ON in a
Vallox Digit2 SE unit. MELTING MODE
MUST NOT BE CHANGED.
3.21. Stopping temperature of supply air fan for antifrost
function in heat recovery cell
Supply fan stop
05 C
The stopping temperature of supply air
fan for the antifrost function in the heat
recovery cell is chosen with the + and
– buttons.
3.22. Hysteresis of antifrost function in heat recovery cell
Hysteresis
03 C
The hysteresis of the antifrost function in
the heat recovery cell is selected with
the + and – buttons.
3.23 Setting base fan speed
MIN speed
1
The desired base fan speed (minimum
fan speed) is chosen with the + and
– buttons. Active when week-clock
control is not on. Week-clock control
changes this speed.
3.24 Choosing maximum fan speed
MAX speed
8
The desired maximum fan speed is
selected with the + and – buttons.
Maximum fan speed is on either with
adjustments or always. See section
3.25. Mode of operation of maximum
speed setting.

7
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
OPERATING INSTRUCTIONS FOR CONTROL PANEL
4. Week-clock control
4.1 Week programme programming
The week programme can be used to set the desired fan speed (base fan
speed) and supply air temperature for each hour of the day on seven days
a week. The week programme overrides manual adjustments.
Carbon dioxide and humidity adjustment can increase fan speed but never
decrease it below the base fan speed set in the week programme.
Example: Monday
It is the intention to decrease fan speed to speed 2 and supply air tempera-
ture to 17 ºC between 07:00 (7 a.m.) and 16:00 (4 p.m.). After that, fan
speed is raised to speed 4 and supply air temperature to 20 ºC. For the
evening, fan speed is boosted to speed 6 between 19:00 and 21:00 (7
p.m. and 9 p.m.), after which fan speed is lowered back to 4.
4.2 Adjusting time
5. Factory settings
Base fan speed = 1
Maximum fan speed = 8
Carbon dioxide adjustment (CO2) = 900 ppm CO2
Basic humidity level = automatic or manual selection
Adjustment interval = 10 min.
Stopping of supply air fan (cell) = 5 °C
Freezing protection hysteresis = 3 °C
Preheating setting = 0 °C
Maintenance reminder = 4 months
Cell bypass = 12 °C
Cascade adjustment = not in use
Humidity level (Rh level) setting = automatic
Switch type = fireplace switch
Supply air setting = 10 °C
(MLV and VKL models 18 °C)
Speed steps are not in use in Vallox Digit2 models
3.25 Mode of operation of maximum speed setting
MAX speed limit
with adjustments
The maximum fan speed setting can
be selected to be active either only in
connection with (carbon dioxide and
humidity) sensor adjustments or perma-
nently. The selection is done with the +
and – buttons.
3.26 Adjusting fan on the supply air side
DC fan, supply
100%
Not in use in Digit2 SE.
3.27 Adjusting fan on the extract air side
DC fan, exhaust
100%
Not in use in Digit2 SE.
Move the cursor with the arrow keys and
change values with the + and – buttons.
Note that to exit and save when the
programming is finished, move the cursor
below the word Exit and press + or –.
Changes in fan speed (sp.) and supply
air temperature (temp.) are only made for
the hours desired; in other cases, use N
(no change to previous).
Monday (d=1), 07:00 (h=7), fan speed
2 (sp. = 2), supply air temperature 17 °C
(temp =17).
Move the cursor to the following hour.
Monday (d=1), 16:00 (h=16), fan speed
4 (sp. = 4), supply air temperature 20 °C
(temp =20).
Move the cursor to the following hour.
Monday (d=1), 19:00 (h=19), fan speed
6 (sp.=6), supply air temperature no
change (temp=N).
Move the cursor to the following hour.
Monday (d=1), 21:00 (h=21), fan speed
4 (sp.=4), supply air temperature no
change (temp=N).
Move the cursor to the following hour.
3.28 Fan speed level adjustment
Speed 1 level
15%
In Vallox Digit2 SE, it is not possible to
adjust fan speed levels.
3.29 Moving to Operating menu
To Main menu
press + and –
To move back to the Operating menu,
press the + and – buttons simultaneous-
ly.
Similar changes have to be made separately for each day. Finally, exit the
programming mode by selecting Exit. If you wish, you can erase the week
programme as indicated in section 3.6. You can then start programming
from the start. You can see the settings programmed by choosing a day and
by scrolling the hours with the + or – button.
Move the cursor with the arrow keys
and change values with the + and
– buttons. Exit and save when the
programming is finished.
Monday (d=1), hours 15 (h=15),
minutes (M=30)
Time is maintained even though there is
a power failure. (See section 1.1, figure
items 5 and 6).
d hr sp tmp
10 N N Exit
d hr sp tmp
17 2 17 Exit
d hr sp tmp
116 4 20 Exit
d hr sp tmp
119 6 N Exit
d hr sp tmp
121 4 N Exit
Cursor
D Day 1…7
1 = Monday, 2 = Tuesday etc.
H Hour
0…23
Sp. Fan speed
1…8
Temp Supply air temperature
10…30°C
Exit Save the setting and exit
N No change to previous hour setting
Cursor
D Day 1…7
1 = Monday, 2 = Tuesday etc.
H Hour, 0…23
M Minutes, 0…60
Exit Save the setting and exit
STARTING POINT
day hour min
115 30 Exit
7
This appliance can be used by children aged from 8 years and
above and persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in a
safe way and understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by
children without supervision.

8
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
Filters
When the maintenance reminder or filter guard lights up the indicator,
check if the filters are clean. Outdoor air is filtered with two kinds of
filters in the unit. A G4-class coarse filter (A) filters off insects, rough
pollen and other dust. An F7-class fine filter (B) filters off fine dust
invisible to the eye. Extract air is filtered with a similar G4-class filter
to that used for filtering outdoor air.
Clean the coarse filters (A) when needed, for instance by vacuuming
them 2 to 4 times a year and whenever the maintenance reminder
or filter guard notifies of the need for maintenance. When you open
the door of DIGIT2 SE, the safety switch (T) turns power off from the
unit. You can also wash the filters with circa +25…30 °C warm
water and washing-up liquid, pressing them smoothly. Do not handle
the filters with force. When washing is done properly, filters stand
cleaning a few times. In other words, you have to replace them at
least once a year or when needed.
The fine filter (B) is not washable. Clean it at the same time as G4-class
filters, using the brush nozzle of a vacuum cleaner. When cleaning,
be careful not to break filter material. To ensure good supply air
quality, replace the filter when needed, at least at one-year intervals,
depending on local air quality. It is recommended to replace filters
in autumn. This way the filters stay cleaner throughout the winter and
can effectively filter off dust in the following spring.
When you clean the filters, you are also advised to check the
cleanliness of the heat recovery cell (C) approximately every two
years. Pull the cell out of the unit by holding the ears at the end of the
unit. If the cell is dirty, soak it in a solution of water and washing-up
liquid. Rinse the cell clean with a jet of water. When the water has
drained from between the laminas, push the cell back so that the
seals next to the sliding surfaces are in place and the ”up” sticker
at the end of the cell points to the corner next to the upper support.
VALLOX DIGIT2 SE filters and heat recovery cell. The units are available as
right- and left-handed models.
In a right-handed (model R) model, outdoor air comes to the unit from the
right side of the centre line, as shown in the instructions.
In a left-handed (model L) unit, outdoor comes from the left side of the
centre line of the unit. The filters, summer/winter damper and heating
radiator also change places correspondingly.
REMEMBER!
Clean the filters at least twice a year. Set the maintenance remin-
der interval as needed; see section 3.2. (The setting depends on
the cleanliness of outdoor and indoor air.)
MAINTENANCE

9
Vallox
SE
Digit2
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What the units include can vary depending on the sales area.
9
Fans and post-heating radiator
The supply and extract air fans (D and E) have been fastened with
rubber collars (F). When removing the fans for maintenance remove
the one-way dampers (L) from the VKL model, open the ear (K) which
is bent over the rubber collar (F). Then lift the rubber collar off and
turn the fan away from above the lower support (M) made of rubber.
Next take off the electrical connector (G).
Clean the fan blades with compressed air or with a brush. Each
propeller has to be equally clean so that the fans stay balanced. Take
care not to remove the balancing pieces attached to the propellers.
If you use water for cleaning the unit or parts of it, do not let it enter
the electrical parts.
Radiators
I Post-heating radiator: Electric
J Preheating radiator: Electric
H Post-heating radiator and actuator: Liquid
P Preheating radiator: Liquid
Detaching and attaching of self-actuated one-way
damper (vacuum damper), MLV and VKL models
A Put the hook of the damper (Y) rim under the side edge of
the fastening collar (K) of the fan (F). Then push the damper
downwards so that the guide edges of the valve go inside the
rubber collar.
B Push the other side of the collar with a finger.
C Put the hook on the other side edge of the damper below the
front edge of the collar. Detaching takes place in the opposite
order.
Filter guard
DIGIT SE can be equipped with a
filter guard as an option. The filter
guard symbol ( ) lights up in the main
display of the control panel normally
at fan speeds 7 and 8 when the
filters are clean, and this does not
require any maintenance activities. If
the symbol does not light up at speed
8, the pressure in the ventilation
ductwork of the building differs from
the factory setting.
If this is the case, adjust the filter guard setpoint lower inside the
unit. If the filter guard symbol lights up at fan speed 4 or 5, the filters
probably need cleaning. If the filters are clean, the lighting up may
be caused by too dense a mosquito net in the external grille or by
the closing of the supply air valves in the rooms. If, after checking
these things, the symbol continues to light up at small speeds, adjust
the setpoint greater.
Condensing water
During the heating season, humidity of extract air condenses into
condensing water. Water formation may be abundant in new
buildings or if ventilation is low compared to the humidity build-up
caused by the residents. Condensing water needs to flow out from
the ventilation unit without hindrance. In carrying out maintenance,
for instance in autumn before the beginning of the heating season,
make sure that the condensing water outlet (L) in the bottom tank is
not clogged. You can check it by pouring a little water in the tank.
Clean if needed.
Do not let water flow into electrical devices.
HFL
I
J
L
F
K
G
G
K
D
M Q
D
M
Q
P
Y
K
F
MAINTENANCE

10
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SE
Digit2
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What the units include can vary depending on the sales area.
MAINTENANCE
Symptom Cause Do this
1Outdoor air coming to the
dwelling is cold.
• Air cools down in the attic ducts.
• The heat recovery cell is frozen, which is why extract air
cannot heat outdoor air.
• The post-heating radiator does not work.
• The extract air lter or cell is clogged.
• The initial adjustment of ventilation has not been done.
• Check the insulation of the attic ducts.
• Check the cleanliness of the lters and heat recovery cell.
2The maintenance reminder
symbol ( ) is displayed
and the unit operates
otherwise normally.
• The maintenance reminder lights up the maintenance
reminder symbol in the main display of the control panel at
an interval of circa 4 months (factory setting).
• You may change the interval (see the operating instructions
for control panel, section 3.2).
• Check the cleanliness of the lters and the unit. If needed, clean or
replace the filters. Also check the external grille.
• Reset the maintenance reminder symbol (see the operating
instructions for control panel, section 3.1.).
3“Exh air sensor faulty”
message is displayed and
the unit is stopped.
• There is a fault in the freezing protection sensor. • Contact a maintenance company. Sensor mounting needs to be
checked and the sensor has to be replaced if necessary.
4“Sup. air sensor faulty”
message is displayed and
the unit is stopped.
• There is a fault in the supply air sensor. • Contact a maintenance company. Sensor mounting needs to be
checked and the sensor has to be replaced if necessary.
5“Ind. air sensor faulty”
message is displayed and
the unit is stopped.
• There is a fault in the extract air sensor. • Contact a maintenance company. Sensor mounting needs to be
checked and the sensor has to be replaced if necessary.
6“Out. air sensor faulty”
message is displayed and
the unit is stopped.
• There is a fault in the outdoor air sensor. • Contact a maintenance company. Sensor mounting needs to be
checked and the sensor has to be replaced if necessary.
7“Cell sensor faulty”
message is displayed and
the unit is stopped.
• There is a fault in the sensor of the heat recovery cell. • Contact a maintenance company. Sensor mounting needs to be
checked and corrected if necessary.
8"Bus fault" message is
displayed and the unit
operates at speed 1 (check
the fan speed).
• Wiring fault in the carbon dioxide sensor, in the control
panel or in the humidity sensor, or the cable is of the wrong
type.
• Contact a maintenance company. The connections have to be
checked and corrected if necessary.
9“Freezing alert” message
is displayed and the unit is
stopped.
• Antifreeze of the water-circulating radiator is active.
NOTE! If there is no non-freezing solution in the water of
the radiator, the radiator is at risk of freezing.
• Immediately troubleshoot the situation. Consult a maintenance
company to find out if there is any non-freezing solution in the
radiator. Check if the circulation pump is broken, the boiler out of
operation etc. The situation may pass by itself as soon as supply air
temperature exceeds 10 degrees, but do not wait till it happens.
10 The desired automatic
adjustment does not stay
on.
• There is a fault in the humidity or carbon dioxide sensor.
One of the sensors is broken or missing.
• Contact a maintenance company. Sensor mounting and connections
have to be checked. (Sensors are options.)
11 The fans are not running
and no indicator light is lit
at the control panel.
• Door switch may be broken or the door is not quite closed.
• The unit is out of power, for instance because a fuse has
blown.
• The glass tube fuse (located in the control card behind a
protecting plate) protecting the electronics inside the unit
may have blown.
• Check the door switch and fuses. The unit has a T800 mA glass-tube
fuse.
• If needed, contact a maintenance company (for instance to check
the glass tube fuse).
12 The unit does not obey the
control panel.
• Disconnect the plug of the unit from the wall socket, wait for 30
seconds and put the plug back. If this does not help, contact a
maintenance company.
13 “Carbon dioxide alarm”
message is displayed and
the unit is stopped.
• Carbon dioxide alarm. Carbon dioxide content has
exceeded 5000 PPM for two minutes. May be caused by
for instance a fire.
• If there is a re, take the necessary steps.
• You can make the unit operational by disconnecting the plug from
the wall socket, waiting for 30 seconds and putting the plug back.
14 Filter guard symbol
() is displayed and the
unit operates
otherwise normally.
• The pressure in the lter guard (pressure difference switch)
has risen above the adjustment value or speed is 7 or 8
(option).
• Check the cleanliness of the lters and the unit. If needed, clean or
replace the filters. Also check the external grille.
Troubleshooting

11
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SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
Dimensions and duct outlets
Measuring points
Measuring points after the connection outlet. Fan curves
indicate the total pressure available for duct losses.
Air flow measurement outlets
The fixed air flow measurement outlets of the unit are
located behind the cover plate.
You can measure the total pressure of the supply and extract
air ductwork at the measurement outlets, using a pressure
gauge. Pressure readings and air volume curves show air
flow rates at various adjustment positions.
The red measurement hose corresponds to the supply air fan
curve and the black hose to the extract air fan curve. Take
into account the unit model and setting (summer or winter).
TECHNICAL DATA
Duct outlets
Inner diameter of female outlet collar
160 mm
1 Supply air
2. Extract air
3. Outdoor air
4. Exhaust air
A supply water to VKL unit
B return water from VKL unit
C supply liquid to MLV unit
D return liquid from MLV unit
NOTE!
When the system is being adjusted, post-heating must be
selected (winter setting).
1
2
3
4
104131
125
131
104
173211
54 19
41 28 4128
19
54
596
B
616
17541
569 15
1
C
2
D
52
A
3
4
104
131
125
131
104
173211
C
D
596
A
B
SFP 2.5 kW/m3/s
12345678
dm
3
/s
m
3
/h
10 20 30 40 50 60 70 80 90 100
50
110 130
100 150 200 250 300 400 450 500
120
350
100
50
150
200
250
300
350
0
100
50
150
200
250
300
350
10 20 30 40 50 60 70 80
090 100
50
110 120 130
400 450 500
SFP 2.5 kW/m3/s
dm
3
/s
m
3
/h
100 150 200 250 300 350
Air flows/DIGIT2 SE (electric radiator unit, winter setting)
Air flows/DIGIT2 SE VKL (liquid radiator unit, winter setting)
Model R
Model L
Supply air Extract air
S E
E = Extract air fan
S = Supply air fan
E = Extract air fan
S = Supply air fan
EK and SK are examples of
pressure losses in supply and
extract ducts.
EK and SK are examples of
pressure losses in supply and
extract ducts.
S
S
S
S
S
S
S
S
1S 1E 2S
2E
3S
3E
4S
4E
5S 5E
6S
6E
7S
7E
8E
8S
E
E
E
E
E
E
E
E
Input power (total) (W)
Air flow (max.) (dm3/s)
SFP =
Input power (total) (W)
Air flow (max.) (dm3/s)
SFP =
Pressure loss in ducts. Total pressure.Pressure loss in ducts. Total pressure.
EK
EK
SK
SK
Recommended
operating range
Recommended
operating range
At a lower total pressure, SFP
will be smaller at this speed.
At a lower total pressure, SFP
will be smaller at this speed.
Volume flow rate
Volume flow rate
SFP (Specific Fan Power) recom-
mended value <2.5 (kW m3/s)
SFP (Specific Fan Power) recom-
mended value <2.5 (kW m3/s)

12
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SE
Digit2
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What the units include can vary depending on the sales area.
TECHNICAL DATA
100
50
150
200
250
300
350
dm3/s
m3/h
10 12
20 30 40 60 70 80
34567
090
50
8
110 130
100 150 200 250 300 350 400 450 500
50 100 120
Extract air flow in heat recovery bypass situation (summer setting)
PK is an example of pressure losses in the extract ductwork
Fan input power
Fan speed Adjusting
voltage (V)
Fan input
power W
1 60 42
2 80 67
3 100 97
4 120 130
5 140 167
6 160 205
7 180 242
8 230 315
Sound values Digit2 SE
Sound power level in supply air duct
(one duct) by octave band LW. dB
Sound power level in extract air duct
(one duct) by octave band LW. dB
ADJUSTMENT POSITION/AIR FLOW dm3/s ADJUSTMENT POSITION/AIR FLOW dm3/s
Adjustment position 1234567812345678
Air flow dm3/s 15.2 25.8 36.1 48.3 59.2 70.5 79.1 89.8 23.7 33.3 42.2 54.5 68.5 82.7 92.1 109.0
Medium
frequency
of the
octave
band Hz
63 64.1 68.7 71.2 74.4 73.3 77.0 77.2 78.2 50.3 56.3 63.4 66.8 66.3 64.1 70.2 70.4
125 52.3 58.4 62.6 68.0 68.3 69.5 70.6 72.8 39.4 50.0 56.7 61.4 62.9 63.4 65.2 66.9
250 42.8 49.7 54.8 58.1 61.1 63.7 65.3 67.5 31.6 39.8 47.0 52.1 55.4 59.9 60.0 62.2
500 42.8 46.6 51.0 54.0 56.8 59.1 61.0 63.5 30.3 34.3 40.2 44.2 46.7 48.7 50.6 52.9
1000 39.8 51.1 52.9 55.6 58.0 59.2 60.3 61.8 25.9 34.2 39.4 42.7 45.0 46.8 48.1 50.2
2000 29.4 37.3 43.8 48.1 51.6 55.0 58.4 61.0 17.4 27.0 33.9 38.9 42.3 45.0 47.1 49.5
4000 24.6 32.9 39.4 43.8 47.0 49.9 51.9 54.3 25.2 31.5 34.4 37.1 39.2 41.9
8000 23.2 31.5 39.4 42.8 45.8 47.9 50.7 24.3 26.5 32.5 36.3
LW.dB
LWA. dB(A)
64.4 69.2 71.9 75.5 74.9 78.0 78.5 79.8 50.8 57.3 64.4 68.0 68.2 69.1 71.8 72.5
44.7 52.6 55.9 59.3 61.7 63.7 65.5 67.6 32.1 39.5 45.9 50.1 52.5 54.2 56.1 58.2
Sound pressure level dB (A) coming from the unit through the envelope in the rooms where the unit has been installed
(10m2sound absorption)
ADJUSTMENT POSITION/AIR FLOW dm3/s
12345678
20.3 / 23.2 32.1 / 35.1 44.5 / 47.8 56.8 / 61.2 68.4 / 74.4 78.4 / 86.2 86.2 / 95.7 97.3 / 109.0
LpA. dB (A) 11.8 23.7 28.9 32.8 36.2 38.5 40.7 42.9
Pressure loss in ducts. Total pressure.
Recommended
operating range
Volume flow rate
EK

13
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SE
Digit2
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What the units include can vary depending on the sales area.
TECHNICAL DATA
VALLOX silencer unit + Digit2 SE (winter setting)
Sound values Digit2 E + silencer unit
Sound power level in supply air duct
(one duct) by octave band LW, dB
Sound power level in extract air duct
(one duct) by octave band LW, dB
ADJUSTMENT POSITION/AIR FLOW dm3/s ADJUSTMENT POSITION/AIR FLOW dm3/s
Adjustment position 123456781234567 8
Air flow dm3/s 16/24 25/47 36/70 48/90 58/104 68/116 75/131 87/148 25/7 38/7 46/46 59/69 72/79 82/106 92/112 104/141
Medium
frequency
of the
octave
band Hz
63 64 67 69 72 72 74 77 76 54 61 65 68 69 71 71 74
125 51 57 61 66 69 68 69 70 * 40 52 56 59 60 63 65
250 39 45 49 53 56 58 60 62 22 34 42 47 51 54 56 59
500 25 31 35 38 41 43 45 48 * 18 26 32 37 40 42 45
1000 10 21 21 24 26 29 31 34 * * 11 21 28 32 36 39
2000 * * * 13 11 17 18 21 * * * * 12 18 23 28
4000 * * * * 14 19 22 24 * * ** * * * 16
8000 *******23* * ***** *
LW,dB
LWA, dB(A)
64 67 70 73 74 75 77 77 54 61 65 68 70 71 72 74
37 43 46 50 53 54 55 56 24 32 39 43 46 48 50 53
Sound pressure level dB (A) coming from the unit through the envelope in the rooms where the unit has been installed
(10m2sound absorption)
ADJUSTMENT POSITION/AIR FLOW dm3/s
1 2 3 4 5 6 7 8
20/25 31/37 43/50 55/64 66/77 76/89 84/99 95/112
LpA, dB (A) 20 26 31 34 37 40 41 44
596
569
min. 1234
616
SFP 2.5 kW/m3/s
100
50
150
200
250
300
350
dm
3
/s
m
3
/h
10
12
20 30 40 50 60 70 80
34567
0
90 100
50
8
110 120 130
100 150 200 250 300 350 400 450 500
Silencer unit
VALLOX DIGIT 2 SE
EK
SK
E = Extract air fan
S = Supply air fan
EK and SK are examples of
pressure losses in supply and
extract ducts.
Pressure loss in ducts. Total pressure.
Recommended
operating range
At a lower total pressure, SFP
will be smaller at this speed.
Volume flow rate
1S
1E 2S
2E 3S
3E 4S
5S
6S
7S
8S
6E 7E
8E
4E
5E

14
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SE
Digit2
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What the units include can vary depending on the sales area.
14
© VALLOX • We reserve the right to make changes without prior notice.
TECHNICAL DATA
Internal electrical connection Vallox Digit2 SE, code A3550 SE
T Supply air fan
P Extract air fan
M Autotransformer with protective
voltage coil
K Capacitor
H Interference suppressor
L Earthed cord
TK Safety switch
V Water radiator actuator/valve
T1 Overheat protection, automatic
T2 Overheat protection, 2 pcs,
manually reset
R1 Post-heating radiator
R2 Preheating radiator
PM Damper motor 21 V DC
P1 Filter guard, option (supply)
P2 Filter guard, option (extract)
Wire colours
s = blue
m = black
r = brown
vi = green
ke = yellow
pu = red
ro = rose
va = white
ha = grey
vio = violet
H
TK
U1 U3
L2 N4
3
pu/s
FAULT SIGNAL
L
NC
Post-heating
electric radiator
40°C
CONNECTION BOX (inside the unit)
ke-vi
80°C
4
80°C
R1
SFIREPLACE SWITCH
T1
5
m
3R
CONNECTION BOX (on top of the unit)
+
S
SREMOTE MONITORING
GND
m
-
FREEZING PROTECTION (EXHAUST AIR)
SUPPLY AIR TO DWELLING
OUTDOOR AIR TO UNIT
EXTRACT AIR FROM DWELLING
+
A B
PWM1 PWM2
S PRESSURE SWITCH
S RH2
T2
S RH1
L
N
NO
N
230 V
180 V 160 V
RH1
L
NO
Electric
preheater radiator
140 V 120 V
100 V
80 V
60 V
30°C
55°C
M
3L
RH2
55°C
N
1
L
2
S+S
ke s
L1
R2
A-+ +
pu
N
T1
T2
L N
+ S 2 1 S GND
m
M
B
vio ha
rva ro vi
N
L2
Water radiator
actuator
(VKL models)
V
H
RS-485BUS
PM
P1
P2
NC
NTC SENSORS
MOTHERBOARD
FUSE
FAULT SIGNAL
FAULT SIGNAL
16x0.25mm²
1 2
234
REMOTE MONITORING CONTROL
ha/ro
L
6
0-10V DC
7
FIREPLACE SWITCH
6
va/vi va/ke
R
ke/r
r/vi
7
5
2
1
N
K
K
12
r
s
m
r
2 N 12 N 1
3R = R model
3L = L model
8 x 1s
ha r
ha r
Damper motor connection
P
T
m
s
ke-vi
SUPPLY AIR FROM CELL
51
234 95 678 110234 95 678 110

15
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Digit2
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15
TECHNICAL DATA
Mounting, removing and wiring of the control panel
The control panel is wired straight from the electrical connection box. The control
panel can also be connected in series with a CO2sensor or another control
panel. (See External electrical connection.)
Control panel addresses
If two or more control panels are connected to the system, the addresses of the
control panels have to be changed.
For example 3 control panels.
• Connect the  rst control panel to the unit and change its address to 3.
• Connect the second control panel to the unit and change its address to 2.
• Connect the third control panel and make sure that its address is 1.
If control panels have the same address, they go to bus fault state. In this case,
remove one of the control panels and change the address of the other panel.
The above mentioned situation can arise in connection with the later installation
of an additional control panel.
External electrical
connection METAL = M
WHITE 2 = B
ORANGE 2 = A
WHITE 1 = -
ORANGE 1 = +
NOTE!
Faulty connection of
the + wire DESTROYS
CONTROL PANEL
LON CONVERTER
OPTION
NOTE!
Faulty connection of the +
wire DESTROYS THE SENSOR
CONTROL PANEL 1
ONE OR MORE
1 INCLUDED AS STANDARD
CO2SENSOR 1
ONE OR MORE
OPTION
FAULT SIGNAL
MAX. 1A, 24 V DC
(POTENTIAL-FREE CONTACTS)
FIREPLACE SWITCH
Button switch
(self-resetting contact)
THE FIRST HUMIDITY SENSOR IS
CONNECTED TO REPLACE THE R6k8
RESISTOR
HUMIDITY SENSOR %RH1
OPTION
HUMIDITY SENSOR %RH2
OPTION
0...10 VDC
REMOTE MONITORING
SHORT-CIRCUIT WIRE
HAS TO BE REMOVED
BEFORE CONNECTION
RS-485 BUSFAN CONTROL FIREPLACE
SWITCH FAULT SIGNAL
CONNECTION BOX (on top of the unit)
PLUG CONNECTION 10 A/16 A
16 A WHEN THE UNIT IS EQUIPPED WITH
ELECTRIC PRE- AND POST-HEATING
1.8 m FROM TOP OF THE UNIT
CONTROLLING EXTERNAL SOLENOID VALVE
AND CIRCULATION PUMP IN MLV UNIT
SOLENOID VALVE
CIRCULATION PUMP
Width 90 mm
Height 110 mm
Depth 23 mm

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16
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MLV radiator control
POST-HEATING OFF
SUPPLY AIR TEMPERATURE < 20 °C
OUTDOOR AIR TEMPERATURE > 0 °C
SUPPLY AIR TEMPERATURE > 20 °C
OUTDOOR AIR TEMPERATURE < 7 °C
TEMPERATURE SETTING 20 °C
COOLING OFF
PREHEATING OFF
COOLING ON
PREHEATING ON
POST-HEATING ON MLV WINTER SETTING 0 °C
Patterista lähtevän ilman lämpötila °C
-2
-4
0
2
4
Maalämpönesteen lämpötila °C
-6
90
68 10
4
2
0
70
30
50
/s
ilmavirta, dm
3
/s
ilmavirta, dm
3
70
Patterista lähtevän ilman lämpötila °C
17
16
Maalämpönesteen lämpötila °C
18
19
20
30
21
22
6
4
2
0
50
90
810
Patterin painehäviö, kPa
10
5
15
20
25
0
0,06
nestevirta, dm3/s
30
0,08
0,04
0,02
0
35
30
-6
-8
-4
-2
0
70
2
4
2
0
-2
-4
6
8
30
46
70
VALLOX DIGIT2 SE MLV heating/cooling radiator performance
MLV RADIATOR HEATING POWER
Ethanol 30% Flow 0.07 dm3/s
Incoming air -12 °C
MLV radiator pressure loss
MLV RADIATOR COOLING POWER
(1.5...2.5 kW)
Ethanol 30% Flow 0.07 dm3/s
Incoming air 28 °C Relative humidity RH 60%
COOLING OF MLV RADIATOR GEOTHERMAL LIQUID
Ethanol 30% Flow 0.07 dm3/s
Incoming air -12 °C
Incoming air -30 °C
TECHNICAL DATA
Temperature of air from radiator °CRadiator pressure loss, Pa Temperature of air from radiator °C
Temperature of geothermal liquid from radiator °C
Geothermal liquid temperature °C
Liquid flow, dm3/s
Geothermal liquid temperature °C
Temperature of geothermal liquid to radiator °C
Air flow dm3/s
Air flow dm3/s
Air flow dm3/s

17
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17
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VALLOX DIGIT2 SE VKL post-heating radiator performance
Temperature of air coming to radiator 12 °C
liquid flow 0.05 dm
3
/s
liquid flow 0.03 dm
3
/s
VKL water radiator power VKL radiator pressure loss
Radiator pressure loss, kPa
10
5
15
20
25
0
0.06
Water flow, dm
3
/s
30
0.08
0.04
0.02
0
Valve pressure loss
0.3 0.4
Liquid flow dm
3
/s
0.20.02 0.03 0.04 0.05 0.06 0.08 0.10.01
1 2 3 4 5 6 7
0.25 0.5 0.75 1.00 1.25 1.45 1.55 1.7
17.5=open
Adjustment
position
kv value
Pressure loss p kPa
Cooling of water in radiator
0.5
0.25
0.75
1.0
1.25
0
15
10
5
0
Cooling of water in radiator °C
Radiator total power kW
50 dm
3
/s
0.5
0.25
0.75
90 dm
3
/s
Air flow
1.0
1.25
0
25 30 20
15
12
30 dm
3
/s
70 dm
3
/s
Temperature of air from unit °C
Radiator total power kW
45 °C
35 °C
25 °C
Temperature of
water coming to
radiator
Temperature of air coming to radiator 12 °C
liquid flow 0.05 dm
3
/s
liquid flow 0.03 dm
3
/s
TECHNICAL DATA

18
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
MOUNTING/Ceiling and wall mounting
DIGIT2 SE location
Mount DIGIT2 SE in a place where temperature does not go below +10 °C. Without protective
enclosure, the unit must be located in a place with no acoustic disturbance, such as storerooms
or technical rooms. DIGIT2 SE can also be located in a damp room, but not in a bathroom
next to a sauna bath.
Ceiling mounting
VALLOX DIGIT2 SE unit can be equipped with an easy-to-use ceiling mounting plate as an
option (pat. pending). The ceiling mounting plate is fastened to the ceiling with M8 thread
bars. Fix the bars so that they stand the weight of the unit (circa 71 kg). The ceiling mounting
plate has to be fixed horizontally in order to ensure that the unit will be straight. The outdoor air
duct must be insulated against condensation, also between the unit and the ceiling mounting
plate.
Mounting
Lift the unit straight upward, till the locking wings on the sides of the mounting plate lock into
the side plates of the unit. You can detach the unit from the mounting plate by releasing the
locking wings from the side plates. To facilitate mounting, you may use a lubricant, such as
O-ring grease, in the collar seals. Mounting accessories include rubber silencers, base plates
and nuts. Thread bars are not included in the delivery.
Wall mounting
DIGIT2 SE is mounted on the wall with a mounting plate as shown in the adjacent figure.
Wall construction
Pay attention to the wall construction when mounting the unit. Avoid mounting the unit on a
hollow, echoing dividing wall and on a bedroom wall because of sound conduction, or prevent
sound conduction.
Condensing water
The delivery includes a water seal. By connecting a pipe to the water seal the water condensing
from extract air can be led to a floor drain. The pipe must never be connected directly to the
drain. The condensing water pipe must have a downward slope. The unit comes with separate
instructions for mounting and using the water seal.
MOUNTING
15
25
back edge
of unit
side plate
back edge of
ceiling mounting
plate
DET1
1:2
596
548
458
569 15
25
DET1
1. Nut M8
2. Washer
3. Rubber vibration damper
4. Thread bar M8
DET 2
3
1
2
1
45
-0.0
+3.0
top edge
of DIGIT2
side plate
bottom edge
of ceiling
mounting plate
23
4
17.5
42
30 17.5
32
487.5
450
1616
SPACE BETWEEN TOP AND BOTTOM BRACKET
Space between wall and
unit = 4
After the unit has been
mounted, the space
between the wall and
unit can be shortened
by tightening the top
bracket.
2
Note!
Space between
straight-line wing
and wall is 2 mm.
VALLOX DIGIT2 SE
ceiling mounting
Ceiling mounting plate before fastening
Top part of wall bracket
Bottom part of wall bracket
Wall bracket mounted
LOCKING WINGS
4 x ø160 female
WEIGHT OF UNIT CIRCA 71 kg
VALLOX DIGIT2 SE
wall mounting
Wing
Wall mounting
bottom bracket
Wall mounting
top bracket

19
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
19
© VALLOX • We reserve the right to make changes without prior notice.
MOUNTING
Connection of VKL post-heating radiator to underfloor heating circuit
Efforts have been made to minimise the risk of freezing caused by the connection with a number of antifreeze functions.
1. The unit stops if supply air temperature goes below the temperature set and automatically starts as soon as temperature rises.
2. When the unit stops, the self-actuated dampers (E) that have been mounted in the fans close.
3. The electric valve (T) opens when the unit becomes dead.
4. The unit also issues an alarm of freezing risk at the controller.
Operation of VKL post-heating radiator
• The temperature of heating water must be adjusted according to the temperature of outdoor air.
• No water must be led into the radiator of the unit until the system has been adjusted for operation and heating is on in the
heating network, or other measures have been taken to ensure that the radiator will not freeze.
• Water circulation in the heating network connected to the unit and the circulation pump must not be stopped during the
heating season.
• Basic adjustment of water fl ow in the VKL radiator is done by means of valves (R), which also act as stop valves when
needed (not included in the delivery).
Connection of MLV preheating/cooling radiator
ALWAYS PRIMARILY FOLLOW THE CONNECTION PLAN PREPARED BY THE HVAC PLANNER OR THE HEAT PUMP MANUFACTURER.
See the adjoining example of connecting an MLV unit to the ground collector.
The supply pipe of the MLV circuit is connected to the pipe returning from the collector. The liquid returning from the MLV circuit is
taken to the return pipe of the ground collector. If it can be presumed that the internal pressure losses of the heat pump in the ground
collector are high, it is recommended to bypass the heat pump so that the liquid will circulate when the heat pump is stopped. In this
case the pressure loss of the bypass non-return valve has to be lower than that of the heat pump.
When the requirements for starting the heating or cooling function are met, the control function of the unit opens the solenoid valve
(MV) and starts the pump (P). The components of the MLV circuit mentioned in the diagram are not included in the delivery. Observe
the freeze resistance of the liquid used in the ground collector.
The connection pipes of the MLV radiator have to insulated against condensation. If the heat pump has an open expansion tank, it
must be situated at the highest point of the network.
Note! Because of the risk of humidity damage, supply air temperature in a duct with no condensation insulation should not go below
+16...20 °C.
Vallox Digit2 SE R
Y
PIP
R
R
HEAT PUMP
T
MV
Heating water
adjustment
E
R
Supply
Supply
Y2
MLV circuit
Return
Return
RADIATOR HEATING
UNDERFLOOR HEATING
GROUND COLLECTOR
P Circulation pump (size for example 0.07
dm3/s, 60 kPa), not included in the
delivery
Because of the risk of condensing the pump
should be suitable for pumping liquid that is
colder than the ambient temperature (e.g.
Magna1 25-60 by Grundfos).
MV Solenoid valve, not included in the delivery
The valve has to be suitable for the liquid
in the ground collector (for example
ELV05006, Stig Wahlström).
T T wo-way control valve, included in the unit
delivery
Y Non-return valve, not included in the
delivery (as low pressure loss as possible)
E Self-actuated dampers
IP Air bleeder (located after the pump and at
the highest point in the system)
Y2 Non-return valve
The pressure loss of the valve has to be
lower than that of the heat pump.
Other connections
Heat can be led to the Digit2 SE VKL post-heating radiator in other ways than that
presented above. It is possible to build a separate heat transfer circuit for the radiator
in order to ensure a higher power or to eliminate the risk of freezing by means of a
non-freezing heat transfer liquid. For more information, see the instructions “VALLOX VKL
connections”. The instructions are found at the website of Vallox Oy: www.vallox.com.

20
Vallox
SE
Digit2
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
1.09.391E/1.9.2014/PDF
46
20
42
43
44
29 30
45
15
15
21
38
16
811
12
32
1
3
4
5
6
7
13
16
18
19
23
24
25
26
27
6
7
8
9
10
25
28
31
33
34
35
36
36
37
39
40
41
47
48
49
17
17
14
14
2
No. Part Code
1 Side plate 3323100
2 Wall mounting plate Upper 3347600
3 Wall mounting plate Lower 3347800
4 Door 3351700
5 Plastic water seal (klick) 3292500
6 Filter stand 3326000
7 Pre- and post-heating resistor1200 W 942190
8 Push button 948450
9 Post-heating resistor +80 °C 946025
thermal protector,
needs to be reset
10 Post-heating resistor +40 °C 946091
thermal protector, automatic
11 Preheating resistor +55 °C 946080
thermal protector, needs to be reset
12 Preheating resistor +30 °C 946085
thermal protector, automatic
13 Transformer, 9-pole 940027
14 Fan 210 W, with hood 1069100
15 Fan collar rubber 3146500
16 Fan bottom support 3146600
17 Fan motor 210 W R2E140 935170
18 Capacitor 4 μF 942035
19 Interference suppressor 942200
20 NTC sensors 946140
21 Motherboard PK 949037
23 Glass tube fuse, slow 5*20 0.8A 952484
24 Heat exchanger, 200*200*520 933090
cross-flow heat recovery cell
25 G4 filter 3327000
26 F7 fine filter 978125
27 Safety switch 948370
28 Filter guard (option) 948600
29 2-way valve (alternative) 946300
V5822A1048 DN 1.5, kv 1.0
30 Actuator MT8-230LC-NO (alternative) 946320
(open when dead)
31 Damper motor CM24 930613
32 Preheating water radiator
a Right-handed 3363200
b Left-handed 3363100
No. Part Code
33 Post-heating water radiator
a Right-handed 342980
b Left-handed 3429900
34 Preheating radiator attachment plate. 3327600
Either right- or left-handed model
has to be chosen
35 Post-heating radiator attachment plate. 3327500
Either right- or left-handed model
has to be chosen
36 Closure flap 3247900
37 Latch body 990990
38 Lever with print 990992
39 Latch Aquamid 6G40 990985
No. Part Code
40 Name plate 990991
41 SED controller 3214000
42 Cover plate 3214400
43 Cover 3214200
44 Lens 3214300
45 Circuit board 949026
46 Base 3214100
47 Humidity sensor (option) 946142
48 CO2sensor (option) 946146
49 LON converter (option) 3151600
Exploded view and
parts list VALLOX
Digit2 SE
( A3550 SE)