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What the units include can vary depending on the sales area.
Vallox
121
SE
OPERATING INSTRUCTIONS
Operating instructions VALLOX 121 SE
For indoor air to stay healthy and benefi cial 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 121 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 the control panel.
In normal conditions basic ventilation, with a change of air every
two hours, is suffi cient 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 121 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 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.
Ventilation control with carbon dioxide sensor
(option)
• In carbon dioxide control, VALLOX 121 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 121 SE unit.
• The adjustment is switched on/off and, if needed, the setpoint
(500...2000 ppm) is set at the control panel. The factory set-
ting is 900 ppm. The recommended maximum carbon dioxide
content in good indoor air is circa 1,000 ppm.
• During control, the control panel can 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 in for example washing rooms.
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, for instance after a shower. The setpoint automatical-
ly 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 fi xed. The setting can range
between 1...99 %RH and is set at the control panel. This can
be used in for example public saunas and swimming pools. The
program aims at keeping humidity at the setpoint. The setpoint
can be changed if needed. The mode of adjusting is chosen at
the controller. Recommended humidity content of good indoor
air is approximately 45%.
• During this control, the control panel can 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 fi rst taken into use with automatic setpoint
search enabled (factory setting), it takes 3 to 10 hours for the
program to defi ne the value. During this time, humidity adjust-
ment is not enabled (because the fi rst value, selected at the
factory, is 100%).
• Automatic search is enabled even if humidity control is not
selected.
Controlling ventilation with voltage signal
• VALLOX 121 SE fan power can be controlled with a voltage
signal coming from remote monitoring.
• The signal can be used to select speeds 0–8. 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 dioxi-
de and humidity adjustment also operate within the set limits.
Carbon dioxide and
humidity sensors
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
