Vallox DIGIT2 SE VKL Specification sheet

• 1.09.395E
• 9.2.2011
• Code 3550 SE
© VALLOX
INSTRUCTIONS FOR USE AND MAINTENANCE
DIGIT SED
ELECTRONIC CONTROLLER
WITH LCD DISPLAY
MODELS:
VALLOX DIGIT2 SE
VALLOX DIGIT2 SE VKL
VALLOX DIGIT2 SE MLV VKL
VALLOX DIGIT2 SE MLV electric
© VALLOX • We reserve the right to make changes without prior notice.
Vallox
SE
2Digit

VALLOX DIGIT2 SE models
Code: 3550 SE
Models: VALLOX DIGIT2 SE, VALLOX DIGIT2 SE VKL,
VALLOX DIGIT2 SE MLV VKL, VALLOX DIGIT2 SE MLV electric
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: liquid radiator
VALLOX DIGIT2 SE has been initially adjusted
for normal circumstances in your home. Venti-
lation adjustment is needed mainly in the
following circumstances:
1. THREE QUESTIONS ABOUT VENTILATION
1.1. Why is air replaced in dwellings? ................................................. p. 3
1.2. What are the characteristics of adequate ventilation? ...................... p. 3
1.3. How much air is replaced? ........................................................... p. 3
2. INSTRUCTIONS FOR USING VALLOX DIGIT2 SE
2.1. Making the unit ready for operation ............................................... p. 4
2.2. Ventilation control ........................................................................ p. 4
2.3. Ventilation control with control panel .............................................. p. 4
2.4. Ventilation control with carbon dioxide sensor ................................. p. 5
2.5. Ventilation control with humidity sensor .......................................... p. 5
2.6. Ventilation control with voltage or current signal .............................. p. 6
2.7. Ventilation control with remote monitoring system ............................ p. 6
2.8. Post-heating ................................................................................ p. 6
2.9. Supply air constant temperature control .......................................... p. 6
2.10. Supply air cascade control ........................................................... p. 6
2.11. Heat recovery bypass function ...................................................... p. 6
2.12. Heat recovery antifrost function ..................................................... p. 7
2.13. Maintenance reminder ................................................................. p. 7
2.14. Filter guard function ..................................................................... p. 7
2.15. Antifreeze function in water-circulating post-heating unit ................... p. 7
2.16. Fireplace/booster switch ............................................................. p. 8
2.17. Fault signal relay ......................................................................... p. 8
2.18. Air filtering ................................................................................. p. 8
3. CONTROL PANEL
3.1. Instructions for use ....................................................................... p. 9
3.2. Operating menu .......................................................................... p. 9
3.3. Settings menu .............................................................................. p. 10
3.4. Week clock control ...................................................................... p. 12
3.5. Factory settings ........................................................................... p. 12
4. MAINTENANCE INSTRUCTIONS
4.1. Filters ......................................................................................... p. 13
4.2. Fans and post-heating radiator ...................................................... p. 14
4.3. Filter guard ................................................................................. p. 14
4.4. Condensing water ....................................................................... p. 14
5. TROUBLESHOOTING ...................................................................................p. 15
VALLOX DIGIT2 SE
TABLE OF CONTENTS
2
2© VALLOX • We reserve the right to make changes without prior notice.
EVERYDAY QUICK GUIDE
NOTE!
Never switch ventilation off,
because ventilation keeps indoor air
quality uniform and removes gases
and dust emanating from the
structures.
• Taking a bath:
Boost ventilation in bathing and washing
facilities in order to ensure that the rooms
get dry as quickly as possible. It is advisab-
le to have boosted ventilation on for 2 to 3
hours after taking a sauna bath, unless au-
tomatic adjustment based on humidity con-
tent is used.
• Washing and drying clothes:
Boost ventilation in washing and drying
rooms during the activity, unless automatic
adjustment based on humidity content is
used.
• Sleeping:
Ventilation in a bedroom has to be suffi-
cient throughout the night. The level is cor-
rect when air does not smell fusty when
you enter the room in the morning. If the
carbon dioxide content of a room is moni-
tored and ventilation is adjusted according-
ly, air will always be fresh.
• Empty dwelling:
To save energy, ventilation can be adjusted
to the minimum level.
• Cooking:
If the ventilation unit is connected to a coo-
ker hood, boost ventilation during cooking.
The most common way to abate coo-
king fumes is to have a separate
cooker hood.
VALLOX DIGIT2 SE MLV VKL
• Preheating radiator: liquid radiator
• Post-heating radiator: liquid radiator
VALLOX DIGIT2 SE MLV electric
• Preheating radiator: liquid radiator
• Post-heating radiator: electric, 1200 W

1. THREE QUESTIONS ABOUT VENTILATION
1.1. Why is air replaced in dwellings?
Good ventilation promotes healthy living for both residents and the building. Air in a dwelling needs to
be replaced in order to remove humidity brought about by living as well as impurities
emanating from structures and human bodies. Impurities of indoor air include carbon
dioxide, formaldehyde, radon and other gases as well as dust.
Mechanical ventilation is needed in order to be able to adjust air circulation as needed by
the residents. In a tightly sealed house, air does not circulate sufficiently by natural means.
Even in a poorly sealed house air is only replaced because of differences between indoor
and outdoor air temperatures, or because of winds. This means that ventilation is dependent
on weather conditions and cannot be regulated.
It is especially important that humidity and carbon dioxide content of the indoor air stay at a
healthy level. Recommended humidity content of good indoor air is approximately 45%.
Humidity content is lower in winter and higher in summer and autumn. Dust mites thrive in
indoor air if humidity exceeds 50%, and if humidity stays at over 60% for a long time in
winter, water condenses in the cold structures of the house and mould starts to form.
The recommended maximum carbon dioxide content in good indoor air is circa 1,000 ppm.
1.2. What are the characteristics of adequate ventilation?
• Indoor air stays fresh in all the rooms of the dwelling, also in bedrooms during night.
Without adequate ventilation, carbon dioxide content tends to rise high especially in
bedrooms.
• The bathroom and the sauna get dry quickly.
• During the heating season, the windows and other outer wall structures remain dry.
• Humidity in indoor air is not condensed in the ventilation ducts.
• Air is fresh in the toilet as well.
1.3. How much air is replaced?
For air to be clean to breathe, it has to be replaced with outdoor air every two hours.
In a new and a renovated house, air needs to be circulated continually, at least once an
hour. During the first year in a new and a renovated house, air needs to be circulated even
more efficiently in order to remove harmful gases and structural humidity. In buildings that
are more than a year old and dry, ventilation can be regulated as needed. Ventilation is
boosted during for instance a sauna bath, clothes washing and cooking, and reduced during
very cold periods or when there is nobody at home. Carbon dioxide and humidity sensors
adjust ventilation in the rooms automatically as needed.
SEASONAL CALENDAR
NOTE!
For further details, see inner pages.
Autumn
• Wash or change the coarse filter and clean
or change the fine filter if needed. The
recommendation is approximately once a
year.
• Check that the heat recovery cell is clean.
• Check that the condensing water outlet is
not clogged.
• Switch the post-heating radiator on.
Spring
• Wash or change the coarse filter and clean
or change the fine filter if needed.
• Clean the fan blades and the post-heating
unit if needed.
• Check that summer ventilation is in
operation.
• Switch the post-heating radiator off.
VALLOX DIGIT2 SE
3
VALLOX DIGIT2 SE, order of duct outlets
1. Supply air to rooms
2. Extract air to the unit
3. Outdoor air to the unit
4. Exhaust air outside
R MODEL
1. Supply air to rooms
2. Extract air to the unit
3. Outdoor air to the unit
4. Exhaust air outside
L MODEL
© VALLOX • We reserve the right to make changes without prior notice.
THREE QUESTIONS ABOUT VENTILATION
1234 43 1 2

Wireless remote control
and receiver (option)
Fixed controller (standard)
VALLOX DIGIT2 SE
SPEED
Living area (m2)
Air flow (l/s)
Total electricity consumption of fans (W)
1
55
20
40
2
100
35
60
3
140
50
90
4
175
62
125
5
215
75
160
6
245
85
200
7
275
97
235
8
314
110
305
Remember!
Never turn VALLOX off, or else
you'll risk catching a cough!
4
INSTRUCTIONS FOR USE
2. Instructions for using VALLOX DIGIT2 SE
Also get acquainted with the technical specification. It gives a broader description of the
parts and functioning of the unit.
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.
2.1. Making the unit ready for operation
1. Connect the plug to the mains supply. VALLOX DIGIT2 SE is now ready for operation.
2. Turn the unit on and choose a suitable ventilation power at the control panel. There
are either one or more control panels. See the instructions for using the control panel
in Sections 3.2.1. and 3.2.2. A wireless remote control may also be in use.
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 also takes care of demand controlled ventilation.
2.2. Ventilation control
The unit can be fully controlled with the control panel delivered with the unit, with a wireless
controller (option) or with a LON converter (option).
The standard week clock control can be used to control the fan power of the unit and the
setpoint for supply air temperature. (This function is not available in the wireless remote control.)
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 or current signal.
2.3. Ventilation control with control panel
The control panel can be used for the following ventilation control functions:
2.3.1. Functions for adjusting ventilation power
• Starting and stopping.
• Power adjustment (8 positions).
• Setting the base fan speed and the 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 (if the limitation only exists with adjustments, see the
Settings menu, Section 3.3.6).
2.3.2. Supply air temperature adjustment functions
• Switching the electric post-heating unit on/off.
• Setting the desired supply air temperature (+10 °C...+30 °C).
• Selecting the desired method for controlling supply air temperature
2.3.3. Preheating
• Setting the control temperature for the electric preheating unit (-6 °C...+15 °C exhaust air).
• Changing the setpoints.
There may be three control panels at most. When more than one control panel are used, the
most recent control function is valid.
© VALLOX • We reserve the right to make changes without prior notice.
DIGIT SED
ELECTRONIC CONTROLLER
WITH LCD DISPLAY
Plug
LON converter
Carbon dioxide sensor
Control panel
Humidity sensor
If no precise measurement data is available, the table below shows the speed which is
sufficient for basic ventilation in dwellings of different sizes. The table also shows how much
the fans of the unit consume electricity at various speeds.

VALLOX DIGIT2 SE
INSTRUCTIONS FOR USE
5© VALLOX • We reserve the right to make changes without prior notice.
2.3.4. Liquid-circulating preheating and precooling
• Setting the control temperature (-6 °C... +15 °C, outdoor air) for the heating function in a
liquid-circulating preheating unit (MLV model). The function is on when outdoor air
temperature goes below the set temperature and post-heating has been switched on (see
the instructions for using the control panel, Section 3.3.24.).
When the temperature value is lower than the temperature of the liquid coming from the
ground collector, the liquid is used to heat outdoor air. If preheating cannot keep exhaust
air temperature warmer than the stopping temperature is, the outdoor air fan stops.
• Setting the control temperature (+10 °C... +30 °C, supply air) for cooling in the liquid-
circulating preheating unit (MLV model). The cooling function starts whe the post-heating
radiator has been switched off and the temperature of air coming from the unit to the
dwelling exceeds the setpoint temperature of supply air (see the instructions for using the
control panel, Section 3.2.6.).
When choosing the setpoint temperature for supply air, care must be taken so as not to
bring too cold air into the duct, which may cause 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 the 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.
2.4. 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.
• Carbon dioxide control is anticipatory. When carbon dioxide content is on the rise, it
raises speed up to speed 4 even if the setpoint were not exceeded.
• 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 1,000 ppm.
• When 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.
2.5. Ventilation control with humidity sensor (option)
There are two methods for adjusting fan speed.
1Automatic humidity setting, which is suitable for controlling humidity in washing rooms, for
instance. The program records current humidity level and selects it as the setpoint, which it
then uses as the target for drying air in a bathroom e.g. after a shower. The setpoint
automatically varies according to season, for instance, 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...99 %RH and is set
at the control panel. This can be used in public saunas and swimming pools, for instance.
The program aims at keeping humidity at the setpoint. The setpoint can be changed if
needed.
Mode of adjustment is selected at the controller (see the Settings menu, Section 3.3.19.).
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 basic and maximum fan speeds
selected.
• When the unit is first 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.
Carbon dioxide sensor (CO
2
)
Humidity sensor (RH)
2.4. 2.5.

2.6. Ventilation control with voltage or current signal
• VALLOX DIGIT2 SE fan power can be controlled with a voltage or current 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, i.e. fan speed can be changed at the control panel within
the set limits. Carbon dioxide and humidity adjustment also operate within the set limits.
2.7. Ventilation control with remote monitoring system (option)
• With an optional LON converter, VALLOX DIGIT2 SE can be connected to the remote
monitoring system.
• When VALLOX DIGIT2 SE is connected to the remote monitoring system, compatibility
between the two needs to be ensured.
• The remote monitoring system can control the same functions as the control panel does.
• The remote monitoring system works in parallel with the control panel as well as carbon
dioxide and humidity sensors.
2.8. Post-heating
For most of the year, heat recovered from the air being extracted is enough to warm the cold air
coming from the outside to a suitable temperature. If the heat of extract air is not enough, air
coming from the outside may be heated further with an electric radiator, available as an option
for the unit. Post-heating is switched on at the control panel (see the instructions for using the
control panel, Section 3.1.). When heating has been switched on, the unit automatically adjusts
the selected supply air temperature.
2.9. Supply air constant temperature control
• Post-heating control in VALLOX DIGIT2 SE is relative; when the temperature selected exceeds
supply air temperature by more than 2.5 °C, the radiator is on 100%, and when the
temperature difference gets smaller, the period of active heating is automatically reduced in
two-minute sequences. The adjustment range of heating is 10...30 °C.
• The heating radiator is on when the ( ) sign is displayed.
• Temperature control is only active when post-heating has been switched on.
2.10. Supply air cascade control
• Supply air temperature control can be changed into cascade control.
• It changes the controlling principle of the post-heating radiator. The temperature of air blown
to the ventilation zone is controlled on the basis of extract air.
• The program tries to keep supply air temperature at a value determined by the difference
between extract air and the setpoint as follows: If extract air is warmer than the setpoint,
supply air temperature is lower than the setpoint by the difference. If extract air is colder,
supply air is higher than the setpoint by the difference.
If the temperature in the room is 25 °C and the setpoint is 24 °C, the aim is to blow 23 °C air
to the ventilation zone. If the temperature in the ventilation zone is 24 °C and the setpoint is
25 °C, the aim is to blow 26 °C air to the ventilation zone.
• The aim is to keep the temperature of air blown to the ventilation zone always within the
range of 10...30°C.
• Cascade control can be selected at the control panel, and it is active when post-heating has
been switched on.
• The heating radiator is on when the ( ) sign is displayed.
2.11. Heat recovery bypass function
• The bypass function tries to get as cool supply air as possible to the ventilation zone by
comparing the measuring results of the outdoor air and extract air sensors.
• The heat recovery cell is bypassed when post-heating is switched off, outdoor air temperature
is two degrees more than the setpoint and extract air is warmer than outdoor air.
• The setpoint can be changed between 0 and +25 °C. (Factory setting 12 °C).
VALLOX DIGIT2 SE
6
INSTRUCTIONS FOR USE
© VALLOX • We reserve the right to make changes without prior notice.
2.8.
LON converter

VALLOX DIGIT2 SE
7
INSTRUCTIONS FOR USE
© VALLOX • We reserve the right to make changes without prior notice.
Remember!
Switch post-heating off when it starts
to get too warm in the dwelling becau-
se of warm weathers.
Switch post-heating on again when it
gets cooler in autumn.
2.12. Heat recovery antifrost function and preheating
• Antifrost prevents the heat recovery cell from freezing, thus ensuring proper ventilation even in
cold periods.
• According to the factory setting antifrost is implemented in units with an electric preheating
radiator by stopping the supply air fan. The stopping function is controlled on the basis of the
data given by the temperature sensor measuring the temperature sensor of exhaust air after
the heat recovery cell.
• T he supply air fan stops when exhaust air temperature falls to the setpoint (factory setting
+4 °C) and starts when exhaust air temperature has risen to the value set (by the amount of the
hysteresis setting, factory setting +3 °C).
Preheating
• The unit is equipped either with an electric preheating radiator or a liquid-circulating
preheating radiator (MLV model). The purpose of using the radiator is to minimise momentary
stopping of the supply air fan. This ensures a maximally even supply air flow through the unit.
• An electric preheating radiator is taken into use by using the Settings menu, adjusting switch-
on temperature to be higher than the value for “supply fan Stop”. The difference could be
2 °C, for example.The radiator switches on when exhaust air temperature falls to the setpoint
and switches off when exhaust air temperature has risen to the value set (by the amount of the
hysteresis setting, factory setting +3 °C).
If radiator power is not sufficient in extreme conditions, the supply fan starts to stop as exhaust
air temperature goes down to the “supply fan Stop” value. The setpoint for preheating could
be +6 °C, for instance; the factory setting for “fan Stop” is +4 °C.
• The liquid-circulating preheating radiator (MLV model) starts when post-heating has been
switched on and outdoor air temperature is below the preheating setpoint. The setpoint
temperature must be lower than the temperature of the liquid in the ground collector (factory
setting +0 °C). The automatic control system of the unit switches on the circulation pump and
opens the solenoid valve of the radiator (see the Technical specification).
2.13. Maintenance reminder
• The maintenance reminder switches on the maintenance reminder symbol ( ) in the main
display of the control panel at defined intervals, the factory setting being 4 months.
• The maintenance reminder symbol is reset at the control panel (see the instructions for using
the control panel, Section 3.3.10.).
• The interval can be set between 1 and 15 months at the control panel.
2.14. Filter guard function
• If DIGIT2 SE is equipped with a pressure difference switch for the supply and/or extract air
ductwork, the switch monitors the pressure difference in the whole ductwork. When pressure
has risen (e.g. because of a clogged filter), the filter guard symbol ( ) in the main display of
the control panel is lit up.
• The filter guard closes the contacts of the fault signal relay, and the filter guard symbol ( ) is
seen in the main display.
• The maintenance reminder is on even during this function.
• The operation threshold for the pressure difference switch is adjusted at the pressure
difference switch regulator (0...500 Pa). Factory setting is ca. 260 Pa, and the setting can be
changed if needed. With clean filters, the symbol should light up at speeds 7 and 8.
2.15. Antifreeze function in water-circulating post-heating unit
• The antifreeze function aims at preventing a water-circulating post-heating unit from freezing.
The automatic function stops the supply and extract air fans as soon as outdoor air
temperature falls below 0 °C and supply air temperature below +7 °C. At the same time, the
self-actuated dampers of the fans close and the control valve becomes wide open. The control
panel displays the fault message FREEZING ALERT, irrespective of display.
• The fans start automatically and the dampers open as soon as supply air temperature exceeds
10 °C.
Pressure difference switch

VALLOX DIGIT2 SE
INSTRUCTIONS FOR USE
8© VALLOX • We reserve the right to make changes without prior notice.
2.16. Fireplace switch function/boosting
Fireplace switch function
• The fireplace switch stops the extract air fan for 15 minutes and produces overpressure in the
ventilation zone. This makes it easier to light a fireplace, for instance.
• The function is started in 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 a wall in the fireplace room, for instance. Upon each pressing, the
stopping function continues for 15 minutes (the switch is not included in the delivery).
• During the function, the fireplace/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.
During cold winter periods, the flowing of cold air to the extract ducts may cause the antifreeze and antifrost functions
to start. The situation will normalise in a while, after the functions stops.
Booster switch function
• The booster switch raises the fan speed to the set maximum speed for 45 minutes.
• The function is started in 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 a wall in a classroom, for instance. Upon each pressing, the booster
function continues for 45 minutes.
• During the function, the fireplace/booster switch symbol ( ) is visible in the main display of the
control panel.
• The function is chosen at the control panel (is alternative to the fireplace switch function, see
Section 3.3.17.).
2.17. Fault signal relay (remote monitoring)
• The fault signal relay has potential-free contacts (24 VDC, 1 A).
• The contacts provide information on various failure modes of the unit.
• When the antifreeze function of the water-circulating radiator is on, the
contacts of the relay close and open at a 10-second interval.
• Alarm of high carbon dioxide content switches the relay at 1-second in-
tervals.
• In other fault situations, the contacts are closed.
2.18. Air filtering
VALLOX DIGIT2 SE has an F7 class fine filter (B) and a G3 class coarse filter
(A) on the supply air side as well as a G3 class coarse filter (C) on the extract
air side. The filters need to be in place in the unit whenever ventilation is in
operation.
B
C
A
Heat recovery
cell

Fan speed (3).
Supply air temperature (21 °C).
Post-heating is on.
Time.
Filter guard alert.
Maintenance reminder alert.
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.
21 C
10:20
VALLOX DIGIT2 SE
9
INSTRUCTIONS FOR USING THE CONTROL PANEL
© VALLOX • We reserve the right to make changes without prior notice.
3. Control panel
Separate instructions for use and installation instructions are delivered with a wireless remote control.
1 2 3 4
5 6 7 8
3.2. Operating menu
3.2.1. Main display and change of fan speed
Fan speed can be changed in this display with the + and – buttons
(see Section 3.1., items 7 and 8 in the figure).
The displays of the operating menu (sections 3.2.1.–3.2.6.) can be scrolled with the scrolling buttons
(see section 3.1., items 5 and 6 in the figure).
5Scrolling up
With this button you can scroll the displays upward.
6Scrolling down
With this button you can scroll the displays downward.
7Increase button
With this button you can increase values.
8Decrease button
With this button you can decrease values.
2Carbon dioxide adjustment
Press this button to switch carbon dioxide
adjustment on and off. When the indicator is
lit, the adjustment is on.
3Humidity adjustment
Press this button to switch humidity adjustment
on and off. When the indicator is lit, the
adjustment is on.
4Post-heating
Press this button to switch post-heating on and
off. When the indicator is lit, post-heating is on.
The summer function is active when the indicator
is not lit.
3.1. Keyboard
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.
1Start button
Use this button for switching the unit on and off.
When the indicator is lit, the unit is on.
3
21 C
3
10:20
In order to move the control panel to the settings menu, press the + and – buttons simultaneously.
In the Settings menu you can change setpoints for the ventilation unit.
The content display shows humidity and carbon dioxide content. The corresponding
sensors are required (options).
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.
Supply air temperature setting is changed with the + and – buttons. In the MLV model the cooling
function of the MLV radiator starts when supply air temperature exceeds the supply air setpoint
temperature. NOTE! When choosing temperature make sure that there is not too cold air in the supply
air duct (risk of condensation grows as temperature goes below 20 °C).
3.2.2. Moving to the settings menu
3.2.4. Content display
3.2.5. Temperature display
3.2.6. Setting supply air temperature
To settings menu
See manual
RH1 35% RH2 40%
CO2 0821 PPM
Out 20 In 20
Sup. 20 Exh. 20
Temp. setting
20C
Week clock control can be activated by pressing the + button and deactivated by pressing the –
button. Week clock control is on when the symbol of week clock control is shown 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 3.3.4.
3.2.3. Week clock control
Week program
on

VALLOX DIGIT2 SE
INSTRUCTIONS FOR USING THE CONTROL PANEL
10 © VALLOX • We reserve the right to make changes without prior notice.
3.3. Settings menu
You can reach the Settings menu from the Operating menu as indicated in section 3.2.2. The displays of the Settings menu
(Sections 3.3.1.–3.3.26.) can be scrolled with the scrolling buttons. (See Section 3.1., items 5 and 6 in the figure.)
3.3.1. Setting base fan speed
The desired base fan speed (minimum fan speed) is selected with the + and – buttons.
Active when week clock control is not on. Week clock control changes this speed.
MIN speed
1
3.3.2. Moving to the operating menu
You can return to the operating menu by pressing the + and – buttons simultaneously.
To main menu
Press + and -
The maximum fan speed setting can be selected to be active either in connection with (carbon dioxide
and humidity) adjustments or permanently. The selection is done with the + and – buttons.
3.3.6. Mode of operation of the maximum speed setting
MAX Speed limit
with adjustments
Select the desired language (German, English, Swedish, French or Finnish) with the + and – buttons.
3.3.7. Choosing language version
Kieli / Language
English
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.
Especially, check the unit model (electricity/water) and change if needed as stated in Section 3.3.20.
3.3.8. Restoring factory settings
Factory settings
see manual
The adjustment interval for humidity and carbon dioxide adjustments is selected with the + and –
buttons. The adjustment interval refers to minutes.
3.3.9. Adjustment interval
Adjust interval
10
The maintenance reminder is reset by pressing the + and – buttons simultaneously. This
turns off the maintenance reminder symbol ( ) on the main display.
3.3.10. Resetting the service reminder
Mainten. reset
Press + and -
The contrast setting for the control panel display is changed with the + and – buttons.
3.3.11. Contrast of the control panel display
Display contrast
05
The week programme can be totally erased by simultaneously pressing the + and – buttons.
3.3.3. Erasing the week programme
Erase week prog.
Press + and -
You can access the programming mode for the week clock programme by simultaneously pressing
the + and – buttons. See Section 3.4.1.
3.3.4. Week programme programming
Adjust week prog.
Press + and -
You can adjust time by simultaneously pressing the + and – buttons. For more details, see Section
3.4.2.
3.3.5. Adjusting time
Adjust time
Press + and -
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.
3.3.12. Address of the control panel
Panel address
1
The desired adjustment value for the direct current fan is selected with the + and – buttons. The
rotation speed of the extract air fan can be decreased by decreasing the percentage. If the unit has
alternating current fans, this adjustment has no impact on the functioning of the unit.
3.3.13. Controlling the direct-current fan on extract air side (does not apply to VALLOX DIGIT2 SE as it has an AC fan)
DC fan exhaust
100%

The preheating temperature for the antifrost function of the heat recovery cell is chosen
with the + and – buttons. MLV model: Choose outdoor air temperature at which preheating
is on. (Note! Temperature < the temperature of the liquid circulating in the radiator.)
3.3.24. Pre-heating temperature for antifrost function in the heat recovery cell
Preheater
07C
VALLOX DIGIT2 SE
11
INSTRUCTIONS FOR USING THE CONTROL PANEL
© VALLOX • We reserve the right to make changes without prior notice.
The hysteresis of the antifrost function in the heat recovery cell is selected with the + and – buttons.
3.3.22. Hysteresis of antifrost function in heat recovery cell
Hysteresis
03C
The interval for the maintenance reminder is selected with the + and – buttons. The
maintenance reminder interval refers to months.
3.3.21. Choosing maintenance reminder interval
Maintenance rem.
04
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.
3.3.20. Choosing post-heating for the unit
Radiator type
electric rad.
The basic humidity level can be chosen as either automatic or manual.
The selection is done with the + and – buttons.
3.3.19. Choosing basic humidity level
Rh-level setting
automatic
The desired setpoint is chosen with the + and – buttons when manual adjustment has been selected
as the Rh level setting (humidity setting, Section 3.3.19).
3.3.16. Setpoint of the basic humidity level
Basic %RH level
40%
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.
3.3.15. Changing the operating temperature of heat recovery cell bypass
Cell bypass
10C
The desired adjustment value for the direct current fan is selected with the + and – buttons. The
rotation speed of the supply air fan can be lowered by decreasing the percentage value. If the unit
has alternating current fans, this adjustment has no impact on the functioning of the unit.
3.3.14. Controlling the direct-current fan on supply air side (does not apply to VALLOX DIGIT2 SE as it has an AC fan)
DC fan - supply
100%
The mode of operation of the switch (either fireplace or booster switch)
is selected with the + and – buttons.
3.3.17. Mode of operation of the fireplace/booster switch
Switch type
Fireplace switch
Cascade control is chosen to be on or off with the + and – buttons.
3.3.18. Choosing cascade control for supply air temperature
Cascade adjust
Off
The setpoint for CO2adjustment is chosen with the + and – buttons.
3.3.25. Changing the setpoint for carbon dioxide adjustment
CO2-setting
0900 PPM
The desired maximum fan speed is selected with the + and – buttons. Maximum fan
speed is on either with adjustments or always. See Section 3.3.6. Mode of operation
of maximum speed limitation.
3.3.26. Choosing maximum fan speed
MAX speed
8
The stopping temperature of the supply air fan for the antifrost function in the heat
recovery cell is chosen with the + and –buttons.
3.3.23. Stopping temperature of supply air fan for the antifrost function in the heat recovery cell
Supply fan stop
05C

VALLOX DIGIT2 SE
12
INSTRUCTIONS FOR USING THE CONTROL PANEL
© VALLOX • We reserve the right to make changes without prior notice.
Base fan speed = 1
Maximum fan speed = 8
Carbon dioxide adjustment (CO2) = 900 ppm CO2
Basic humidity level = automatic
Adjustment interval = 10 min.
Freezing protection (cell) = 5 °C
Freezing protection hysteresis = 3 °C
Preheating setting = 0 °C
Maintenance reminder = 4 months
Cell bypass = 12 °C
Cascade control = not used
Humidity level (RH level) adjustment = automatic
Switch type = fireplace switch
Supply air setpoint = 10 °C (MLV and VKL models 18 °C)
3.5. Factory settings
VALLOX DIGIT2 SE has the following factory settings
3.4. Week clock control
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.
3.4.1. Week programme programming
D Hr Sp Tmp
1 12 5 20 Exit
Cursor
D Day 1…7
1 = Monday, 2 = Tuesday, etc.
Hr Hours, 0…23
Sp Fan speed, 1…8
Tmp Supply air temperature, 10...30 ºC
Exit Save the setting and exit
N No change to previous
Example: Monday
Fan speed is decreased to speed 2 and supply air temperature to 17 ˚C between 7:00 (7 a.m.)
and 16:00 (4 p.m.). After that, fan speed is raised to speed 4 and supply air temperature to 20 ˚C.
For the evening, fan speed is boosted to speed 6 between 19:00 and 21:00 (7 p.m. and 9 p.m.)
for the period when a sauna bath is taken, after which fan speed is lowered back to 4.
Move the cursor with the arrow keys and change values with the + and – buttons. Note that Exit
and saving are done when the programming is finished by moving the cursor below the word Exit
and pressing + or –.
Changes in fan speed (Speed) and supply air temperature (Temp.) are only made for the hours
desired; in other cases, use N (no change to previous).
Monday (D=1), time 07:00 (H=7), fan speed 2 (Speed=2), supply air temperature 17 °C
(Tmp.=17). Move the cursor to the following hour.
Monday (D=1), time 16:00 (H=16), fan speed 4 (Speed=4), supply air temperature 20 °C
(Tmp.=20). Move the cursor to the following hour.
Monday (D=1), time 19:00 (H=19), fan speed 6 (Speed=6), no change in supply air temperature
(Tmp.=N).
Move the cursor to the following hour.
Monday (D=1), time 21:00 (H=21), fan speed 4 (Speed=4), no change in supply air temperature
(Tmp.=N).
Move the cursor to the following day.
D Hr Sp Tmp
1 7 2 17 Exit
D Hr Sp Tmp
1 16 4 20 Exit
D Hr Sp Tmp
1 19 6 N Exit
D Hr Sp Tmp
1 21 4 N Exit
Move the cursor with the arrow keys and change values with the + and – buttons. Exit
and saving are done when the programming is finished.
Monday (D=1), time 15 (H=15), minutes (M=30).
Time is maintained even though there is a power failure.
3.4.2. Adjusting time
day hour min
1 15 30 Exit
day Day 1…7
1 = Monday, 2 = Tuesday, etc.
hour Hours, 0…23.
min Minutes, 0…60
Exit Save the setting and exit
Cursor
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 3.3.3. 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.

VALLOX DIGIT2 SE
MAINTENANCE INSTRUCTIONS
13
REMEMBER!
Clean the filters at least twice a year. Set the
maintenance reminder interval as needed. See
Section 3.3.21. (The setting depends on the
cleanliness of outdoor and indoor air).
When cleaning the filters, it is also advisable to check the cleanliness of the heat recovery
cell (C) every two years or so. Grab the ears at the ends of the cell and pull the cell out
of the unit. If the cell is contaminated, soak it in a solution of water and washing-up liquid.
Rinse the cell clean with a jet of water. When all 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.
4. Maintenance instructions
4.1. Filters
When the maintenance reminder or filter guard lights up the indicator
lamp, check filter cleanliness. Outdoor air is filtered in the unit with two
kinds of filters. A G3 class coarse filter (A) filters off insects, heavy 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 G3 class filter as outside air.
Clean the coarse filters (A) by e.g. vacuuming them 2 to 4 times a year
and whenever the maintenance reminder or filter guard. indicates a need
for maintenance. When you open the door of DIGIT2 SE, the security
switch (T) turns voltage off. The filters can also be washed with +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 the G3 class
filters by vacuuming it with a brush nozzle. When cleaning, be careful no
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
through the winter and can effectively filter off dust in the following spring.
VALLOX DIGIT2 SE filters and heat
recovery cell. The units are
available in right and left handed
models.
In the right handed model (model R)
outdoor air comes to the unit from
the right side of the centre line as
shown in the instructions.
In the left handed model (model L)
outdoor air comes in from the left
side of the unit. The filters,
summer/winter damper and the
heating radiator change places
correspondingly.
© VALLOX • We reserve the right to make changes without prior notice.
B
A
A
C
T

VALLOX DIGIT2 SE
14
MAINTENANCE INSTRUCTIONS
4.2. 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 off from above
the lower support (M) made of rubber. Then disconnect the electric connector
(G).
Clean the fan blades with compressed air or with a brush. Each blade has
to be equally clean so that the fans stay balanced. Take care not to remove
the balancing pieces attached to the fan blades.
If you use water in cleaning the unit or its parts, do not let it flow into the
electrical parts.
4.2.1. Radiators
I Post-heating radiator: electricity
J Preheating radiator: electricity
H Post-heating radiator and actuator: liquid
P Preheating radiator: liquid
4.2.2. 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 back edge of the fastening
collar (K) of the fan (F). Then push the damper downwards until the
steering edges of the valve go inside the rubber collar.
B Push the other side of the collar with a finger.
C Put the hook of the front edge of the damper below the front edge of the
collar.
To detach the damper take the same steps in the opposite order.
4.3. Filter guard
DIGIT2 SE can be equipped with an optional filter guard. The filter guard symbol ( ) normally
lights up in the main display at 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. In that case, adjust
the filter guard setpoint lower in the inside of the unit (see Section 2.14). If the filter guard
symbol lights up at fan speed 4 or 5, the filters need cleaning. If they are clean, the lighting
up may be caused by too dense a mosquito net installed in the external grille, contrary to
what is said in the installation instructions, 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 to a higher value.
4.4. 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 connection with maintenance, e.g. 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 may check it by pouring a little water in the tank. Clean if necessary.
Do not let water flow into electrical devices.
© VALLOX • We reserve the right to make changes without prior notice.
L
A B C
Y
K
F
Y
K
F
Y
K
F
L
G
D
F
M
L
F
G
K
D
M
K
Y
K
F
I
J
Q
Q
H
P

15
TROUBLESHOOTING
VALLOX DIGIT2 SE
© VALLOX • We reserve the right to make changes without prior notice.
Outdoor air coming to
the dwelling is cold.
SYMPTOM REASON DO THIS
• 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 filter or cell is clogged.
• The initial adjustment of ventilation has not
been done.
1• Check the insulation of the attic ducts.
• If the heat recovery cell is frozen, check the setpoint for
freezing protection. The setpoint for freezing protection can
be raised by 1 or 2 °C, or the sensor can be bent closer to
the cell, in which case the supply air fan stops earlier (see
the instructions for using the control panel, Section 3.3.23).
Thaw the cell before closing the door.
• If the post-heating radiator does not operate, check to see if
overheating protection prevents it from operating: press
button Q (figure on page 14) and measure the temperature
of supply air inside the unit when the door is closed. If the
radiator does still not work, contact a maintenance compa-
ny.
• Check that the filters and the heat recovery cell are clean.
• Check the functioning of the preheating radiator in the MLV
model.
Supply air fan keeps
stopping.
• The stopping of the supply air fan is active.
NOTE! If you decrease the setpoint too much, the
cell may freeze. Compare with list item 1.
2• The fan stops more rarely and the efficiency of the heat
recovery cell gets better when the setpoint is decreased by
1 or 2 °C. (See the instructions for using the control panel,
Section 3.3.23.)
• Check the functioning of the preheating radiator in the MLV
model.
Supply air fan stops and
starts too frequently.
• The difference between the stopping and
starting temperatures is too small.
• The preheating radiator does not work.
3• Raise the difference between the stopping and starting tem-
peratures by 1 or 2 °C. It extends the period between the
stopping and starting of the supply air fan. (See the instruc-
tions for using the control panel, Section 3.3.22.)
• If the (electric) preheating radiator does not function, check
if overheating protection prevents it from operating: press
overheat protection reset button Q (figure on page 14) and
ensure that the preheating radiator has been taken into use
(see the instructions in Section 2.12. on page 7). If these
steps do not help, contact a maintenance company.
The 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 approximately 4 months (factory
setting).
• You may change the interval (see the
instructions for using the control panel,
Section 3.3.21).
4• Check the cleanliness of the filters and the unit. If needed,
clean or replace the filters. Also check the external grille.
• Reset the maintenance reminder symbol to make it
disappear. (See the instructions for using the control panel,
Section 3.3.10.)
"Exh air sensor faulty"
message is displayed and
the unit has stopped.
• There is a fault in the freezing protection
sensor.
5• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.
"Sup. air sensor faulty"
message is displayed and the
unit has stopped.
• There is a fault in the supply air sensor.
6• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.
"Inp. air sensor faulty"
message is displayed and the
unit is stopped.
• There is a fault in the extract air sensor.
7• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.
"Out air sensor faulty"
message is displayed and the
unit has stopped.
• There is a fault in the outdoor air sensor.
8• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.

"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.
9• Contact a maintenance company. The connections have
to be checked and corrected if necessary.
"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.
10 • 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.
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.
11 • Contact a maintenance company. Sensor mounting and
connections have to be checked. (The sensors are
optional.)
The unit does not work,
the fans are not running
and no indicator light is lit
in the control panel.
• The door switch may be broken, or the
door is possibly not quite closed.
• The unit is out of power, e.g. 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.
12 • Check the door switch and fuses. The unit includes a
T800 mA glass tube fuse.
• If needed, contact a maintenance company (e.g. to
check the glass tube fuse)
The unit does not obey
the control panel.
13 • 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.
"Carbon dioxide alarm"
message is displayed and
the unit has stopped.
• Carbon dioxide alarm. Carbon dioxide
content has exceeded 5000 PPM for two
minutes. May be caused by a fire.
14 • If there is a fire, 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 again.
• Check the cleanliness of the filters and the unit. If needed,
clean or replace the filters. Also check the external grille.
15 The filter guard symbol
() is displayed and the
unit operates otherwise
normally.
• The pressure in the filter guard (pressure
difference switch) has risen above the
adjustment value or speed is 7 or 8.
SYMPTOM REASON DO THIS
© VALLOX • We reserve the right to make changes without prior notice.
1.09.395E/9.2.2011/PDF
VALLOX DIGIT2 SE
TROUBLESHOOTING
Vallox Oy • Myllykyläntie 9-11• FI-32200 Loimaa • Tel. [phone] • www.vallox.com
After a power failure, the unit starts at minimum fan speed. All the other selected adjustments
and setpoints remain in the memory of the unit.