2.14. Filter guard function
• If DIGIT 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 points 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; the setting can be
changed if needed. With clean filters, the symbol should light up at speeds 7 and 8.
2.15. Anti-freeze function in water-circulating post-heating unit
• The anti-freeze 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 falls 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.
2.16. Fireplace switch / boosting function
Fireplace switch function
• The fireplace switch stops the extract air fan for 15 minutes and causes overpressure in
the ventilation zone. This facilitates lighting up the fireplace, for instance.
• The function is activated by pressing a self-resetting push-button switch. On each pressing
of the switch, the stopping function goes on for 15 minutes.
• During the function, the fireplace/booster switch symbol (
) is visible in the main display
of the control panel.
Note! When the extract air fan starts, the draft in the fireplace may get weaker!
In cold winter, the anti-freezing and defrosting functions may start when cool air flows to the
extract air ducts. If the post-heating radiator does not contain any non-freezing liquid, there
is a risk of freezing. The situation will get back to normal some time after the function has
stopped.
Booster switch function
• The booster switch raises fan speed to the preset maximum fan speed for 45 minutes.
• The function is activated by pressing a self-resetting push-button switch. On each pressing
of the switch, the stopping function goes on for 45 minutes.
• During the function, the fireplace/booster switch symbol (
) is visible in the main display
of the control panel.
• The function is selected on the control panel.
© VALLOX • We reserve the right to make changes without prior notification.
2.17. Fault signalling relay (remote monitoring)
• The fault signalling relay has potential free points (24VDC, 1A).
• The points provide information on failure modes of the ventilation unit.
• During water radiator defrosting, the points of the relay close and
open at 10- second intervals.
• High carbon dioxide content alarm switches the relay every second.
• In other failure situations, the points are closed.
2.18. Air filtration
DIGIT SE VALLOX DIGIT SE features coarse filtering of both extract and
supply air before the fans. The unit has a F7 class (B) fine filter and a G3
class (A) coarse filter on the supply side, and a G3 class (C) coarse filter
on the extract side. The filters need to be in place in the unit whenever
ventilation is in operation.
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