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MAINTENANCE INSTRUCTIONS
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.
Led blinks Problem
1
Supply air sensor after the HR cell is faulty
2
Extract air sensor is faulty
3
Supply air sensor is faulty
4
Exhaust air sensor is faulty
5
Outdoor air sensor is faulty
6
Supply air fan has stopped
7
Extract air fan has stopped
8
EEPROM faulty
MAINTENANCE
Before starting maintenance operations
When you open the VALLOX 90MC unit, the safety switch of the door
(T) turns power off from the unit. In spite of that, always disconnect
the plug of the VALLOX 90 MC unit before starting maintenance
operations.
Fans
When the maintenance reminder gives an alarm, the cleanliness of
the fans must be checked. Outdoor air is fi ltered in the unit with two
kinds of fi lters. A coarse fi lter (A) fi lters off insects, heavy pollen and
other dust. An F7 class fi ne fi lter (B) fi lters off fi ne dust invisible to the
eye. Extract air is fi ltered with a coarse fi lter (C).
By using original Vallox fi lters you ensure good operation of the
ventilation unit and the best fi ltering result. The replacement interval
of fi lters 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
When you replace the fi lters, you are also advised to check the
cleanliness of the heat recovery (HR) cell (D) approximately every
two years. The sealing ledge (E) above the HR cell must be pulled
off before the cell can be detached. When the sealing ledge has
been removed, the HR cell can be pulled out of the unit. Note! The
laminas of the HR cell are very thin and get easily damaged. The
correct way of removing the HR cell is to put your hands behind the
HR cell and slowly pull it off. If the HR cell is dirty, wash it by putting
it in a solution of water with washing-up liquid. Rinse the HR cell
clean with a jet of water. When water has drained from between the
laminas, you can push the HR cell back in place. Finally, push the
sealing ledge in place.
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
Repair
Check the sensor and conductors, replace if needed
Check the sensor and conductors, replace if needed
Check the sensor and conductors, replace if needed
Check the sensor and conductors, replace if needed
Check the sensor and conductors, replace if needed
Check the wiring of the fan, replace the fan if needed
Check the wiring of the fan, replace the fan if needed
Replace the circuit board of the unit with a new one
VALLOX 90 MC fi lters and heat recovery cell
The units are available as right- and left-handed models. In a right-handed
(model R) model, outdoor air comes to the unit from the right side of the
centre line, as shown in the instructions. In a left-handed (model L) unit,
outdoor comes from the left side of the unit. The fi lters, summer/winter
damper and heating radiator also change places correspondingly.
Vallox
90
MC
3
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