Vasco DX4 Manuel D'installation Et D'utilisation page 116

7 MALFUNCTION
WARNING
Ventilation unit runs at a higher
speed than when first put into
service.
Led indication lights "2 x orange"
when the switch is operated.
Ventilation unit goes to high
speed - desired flow rate is not
met.
Periodically there is only
exhaust and no supply of air.
Odor nuisance near the device.
Bubbling noise near
Undesirable odors from fresh
supply air.
Condensation water is coming
out of the unit.
30 MALFUNCTION
POSSIBLE CAUSE
Filters dirty.
Filters life span reached.
Air flow blocked. Constant flow
control allows automatic adjust-
ment of speed if obstructions
restrict air flow.
Automatic frost protection is
active (unit defrost cycle).
Siphon is dry.
Suction opening ventilation unit is
too close to a discharge opening
contaminated air (fume hood,
chimney, discharge opening
ventilation unit, ....).
The air ducts are not connected
properly.
The condensate drain is not
connected properly.
The unit is not hanging level.
The siphon is dry.
SOLUTION
Cleaning filters
(See user manual (page 6).
Replace the filters and reset the
error signal (see page 19).
Check:
- Whether all channels are
connected correctly.
- Whether no unwanted parts
entered the ventilation unit
(during the construction phase).
- no sharp bends, crushed
channels, etc. are present in
the risers.
This is the normal operation of
the unit where periodically, the
ventilation unit is heated with
warm indoor air. If this is not
desirable, you can balance venti-
lation up to outside temperatures
of 15°C by using the EVVE.
Fill the siphon with water.
During installation, always
ensure that the fresh air intake
opening is located sufficiently far
from polluted air discharge
openings.
If this is not possible, or you
cannot control the spread of
unwanted odors, you can place
an activated carbon filter in the
fresh air supply duct.
For correct operation, the supply
and drain sides must not be
confused . Check that the
connections match thode on.
Make sure the condensate drain
is properly connected.
Hang the unit level.
Fill the siphon with water.