3
Vallox
121
MC
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
Led
blinks Problem
Repair
1
Supply air sensor after the HR cell is
faulty
Check the sensor and conductors, replace if needed
2
Extract air sensor is faulty
Check the sensor and conductors, replace if needed
3
Supply air sensor is faulty
Check the sensor and conductors, replace if needed
4
Exhaust air sensor is faulty
Check the sensor and conductors, replace if needed
5
Outdoor air sensor is faulty
Check the sensor and conductors, replace if needed
6
Supply air fan has stopped
Check the wiring of the fan, replace the fan if needed
7
Extract air fan has stopped
Check the wiring of the fan, replace the fan if needed
8
EEPROM faulty
Replace the circuit board of the unit with a new one
Troubleshooting
When a fault described in the table
appears, the unit indicates of the fault
with a fault signal relay, indicator light
and LED on the circuit board. The
number of blinks reveals the fault in
question
OPERATING INSTRUCTIONS
MAINTENANCE
Before starting maintenance operations
Disconnect the plug of the VALLOX 121 MC unit before starting maintenance operations.
When you open the VALLOX 121 MC 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 (model R
anticlockwise, model L 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 (P)
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 (model R clockwise, model L anticlockwise)
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
