Vallox DIGIT2 SE, DIGIT2 SE MLV VKL, DIGIT2 SE MLV electric Instructions For Use And Maintenance Manual
• 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. Ventilation 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 advisable to have boosted ventilation on for 2 to 3
hours after taking a sauna bath, unless automatic adjustment based on humidity content 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 sufficient throughout the night. The level is correct when air does not smell fusty when
you enter the room in the morning. If the
carbon dioxide content of a room is monitored and ventilation is adjusted accordingly, 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 cooker hood, boost ventilation during cooking.
The most common way to abate cooking 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
1
2
3
4
4
3 1
2
Wireless remote control
and receiver (option)
Fixed controller (standard)
VALLOX DIGIT2 SE
SPEED
Living area (m
2
)
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 liquidcirculating 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.
1 Automatic 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 (CO2)
Humidity sensor (RH)
2.4. 2.5.
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