VALLOX 252 D
10
PRESSURE DIFFERENT SWITCH
Setting the pressure difference switch
You can test the function of the factory set pressure difference switch and, if
needed, adjust it as follows:
1.
Turn the ventilation unit on and adjust ventilation capacity according
to the planned volume. Note! The doors of the ventilation unit have to
be mounted.
2.
If the filter guard symbol ( ) does not appear in the main display of the
control panel, follow the steps 3...5. If the symbol appears, proceed to
step 6.
3.
If you want to test the pressure difference switch of the supply air
ductwork, cover about half of the supply air filter (EU7) with a piece of
cardboard. If you want to test the pressure difference switch of the
extract air ductwork, cover about half of the extract air filter (EU5).
4.
Restart the ventilation unit and adjust ventilation capacity according to
planned air volumes. Note! The doors of the ventilation unit have to be
mounted.
5.
If the filter guard symbol appears in the main display of the control
panel, proceed to step 7. If it does not appear, proceed to step 6.
6.
You can increase the setpoint of the pressure difference switch as
follows:
Disconnect VALLOX 252 D from the network by switching off power supply on the
distribution panel, for instance.
• Remove the doors of the unit (upper door first).
• Remove the bottom cover of the electrical connection box inside
the unit.
• Remove the cover of the pressure difference switch and turn the
adjusting wheel, increasing the setpoint (see the adjoining picture).
• Put the covers and the door in place, restart VALLOX and adjust
ventilation capacity according to planned air volumes.
• Proceed to step 2.
7.
The pressure difference switch unit is now adjusted: if pressure
difference in the ductwork increases (e.g. clogged filter or grate), the
filter guard symbol ( ) lights up in the main display of the control panel
and the points of the fault signal relay close.
Note! Remove any filter covers used during the adjustment!
