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© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
Vallox
121
SE
MAINTENANCE INSTRUCTIONS
MAINTENANCE
Before starting maintenance operations
Disconnect the plug of the VALLOX 121 SE unit before starting
maintenance operations. When you open the VALLOX 121 SE unit,
the security switch (S) turns voltage off. In spite of this, disconnect the
plug of the unit.
When the maintenance reminder gives an alarm, the cleanliness of
the fans must be checked.
Outdoor air is filtered in the unit with two kinds of filters. A coarse
filter (A) filters off insects, heavy pollen and other dust. An F7 class
fine filter (B) filters off fine dust invisible to the eye. Extract air is filtered
with a coarse filter (C).
By using original Vallox filters you ensure good operation of the
ventilation unit and the best filtering result. The replacement interval
of filters depends on dust content in ambient air. It is recommended to
replace fans in spring and autumn, but at least once a year.
Heat recovery cell
Check the cleanliness of the heat recovery cell D at one-year intervals.
NOTE! The laminas of the cell are very thin and get easily damaged.
The correct way of removing the cell is to put your hands behind
the cell and slowly pull it off. If the cell is dirty, soak it in a solution
of water and washing-up liquid. Rinse the cell clean with a jet of
water. When all the water has drained from between the laminas,
the cell can be remounted to the unit. Before mounting check the
seals. Check that the seal does not start “rolling” with the cell when
you push the cell in place.
A
C
B
D
S
Fans
Check the cleanliness of the fans when carrying out maintenance
for a filter and the heat recovery cell. Clean the fans if needed. The
fans can be removed from the unit for cleaning. The fan blades can
be cleaned with compressed air or with a brush. Do not remove or
move the balancing pieces on the fan blade.
Removing supply fan (T)
Before removing the supply fan, remove the HR cell (D) by pulling
carefully. Place a thin sheet board or paper under the fan in order
to prevent the bottom tank from being scratched when removing the
fan. Unfasten the fixing screw of the fan (H, hex socket head cap
screw AV 4 mm) and place the fan on the bottom tank. Rotate the fan
(R model anticlockwise, L model clockwise) and slide the fan along
the bottom tank. Unfasten the quick couplings of the fan wires and lift
the fan off. Check that the collar rubber is in place before mounting
the fan back in place.
Removing extract air fan (E)
Before removing the extract air fan take out the coarse filter (C),
fine filter (B) and HR cell (D) by carefully pulling them and remove
the maintenance door (F), fixed with two screws. Place a thin sheet
board or paper under the fan in order to prevent the bottom tank
from being scratched when removing the fan. Unfasten the fixing
screw of the fan (H, hex socket-head cap screw AV 4 mm) and place
the fan on the bottom tank. Rotate the fan (R model anticlockwise, L
model clockwise) and slide the fan along the bottom tank. Unfasten
the quick couplings of the fan wires and lift the fan off. Check that
the collar rubber is in place before mounting the fan back in place.
Filters
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During the heating season, humidity of extract air condenses into
condensing water. Water formation may be abundant in new
buildings or if ventilation is low compared to the humidity build-up
caused by the residents. Condensing water needs to flow out from
the ventilation unit without hindrance. In carrying out maintenance,
for instance in autumn before the beginning of the heating season,
make sure that the condensing water outlet (L) in the bottom tank is
not clogged. You can check it by pouring a little water in the tank.
Clean if needed. Do not let water flow into electrical devices.
First remove the HR cell (D) from the unit by pulling it carefully.
Remove the NTC sensor from the cover lid (C) by pulling. Open
the fastening screws of the cover lid (C) and remove the lid. Open
the fastening screw (G) of the post-heating radiator, lift the post-
heating radiator out of its holder and take it out through the cover
lid. Assembling takes place in the opposite order.
Condensing water outlet
Replacing post-heating radiator
T
T
E
E
