© VALLOX • We reserve the right to make changes without prior notice.
1.09.221E/04.0703/PDF/Mainos T
unttunen Oy
Vallox Oy FIN-32200 Loimaa Phone +358 2 7636 300 Fax +358 2 7631 539
Internet: www.vallox.com
VALLOX 252 D
MAINTENANCE INSTRUCTIONS
General
• The door of the unit has two parts. The fixing screw of the upper door - in
the upper corner, on the same side as the electricity lead-throughs - is also
the service switch of the unit. When loosened, this screw with the door
switch cuts off power supply. Always detach the upper door first, and
attach it last.
When attaching the upper door, remember to turn the screw far enough
in order to switch on power supply.
• When only filters are serviced, it is only necessary to detach the upper
door. For other service operations, both doors must be detached.
Always detach the upper door first, and attach it last.
Filters
• The unit includes an EU3 rough filter for outdoor and extract air; an EU7
fine filter for supply air, and an EU3 and EU5 fine filter for extract air. The
filters must be cleaned and replaced at regular intervals (once or twice a
year), and depending on their contamination.
• If the unit is equipped with pressure difference switch units, they give an
indication with the symbol ( ) appearing in the main display of the con-
trol panel or in the remote monitoring units, when the filters need clea-
ning or replacing if needed. In this context, you should also control if
there are any other factors which increase pressure difference in the duct-
work (e.g. a clogged grate or exhaust unit).
• Servicing filters:
– Open the fixing screws of the upper door.
– Lift the door off.
– Check the cleanliness of the filter.
– An EU3 (blue-white) filter can be washed with +25…30˚C warm water
and washing-up liquid. Do not wash or dry the filter with force, but
press them smoothly. When this is done properly, filters can be cleaned
4…5 times.
– EU5 and EU7 filters (fibre filters) are not washable, but they can be
cleaned with pressure air, carefully blowing against the direction of
contamination. When needed, replace the filters with new ones.
The recommended interval for filter change is one year, depending on
the circumstances.
Other cleaning
• In connection with maintenan-
ce, also check the internal
cleanliness of the unit: prehea-
ting and post-heating units, bot-
tom reservoir and internal ca-
sing. Remove dirt with a
vacuum-cleaner, brush, damp
cloth, etc.
• Do not let water flow to the elec-
tric devices!
Upper door
EU 3
EU 7
EU 5
Heat recovery
cell
Fan
Connector
Heat recovery cells
• The heat recovery cells of the unit can be contaminated in spite of filters. Therefore the cleanliness of
the cells must be checked regularly, approximately once a year. It is recommended to check the cells
whenever the filters are serviced.
• The cells can be detached by pulling out the ears on the end plates. Contaminated cells can be
washed with spraying some washing-up liquid inside them, or soaking them in the solution of water
and washing-up liquid. After that, rinse the cells with a jet of water. Let the cells drain and remount
them. When mounting, note the "this side up" labels in the cells.
Fans
• It is advisable to check the cleanliness of the fans in connection with the maintenance of the filters and
heat recovery cells. When needed, clean the fans.
• You can detach the fans by loosening the finger nuts and electric connections (see the instruction label
on the fan hood). The fan impeller can be cleaned by cautiously blowing compressed air to it, by
brushing it, or by wiping it with damp cloth. Each impeller has to be so clean that the fan will stay
balanced. The fan hoods must be cleaned, too.
• Do not let water flow to the fan motor!
Condensing water outlets
• In connection with maintenance also check the bottom reservoir with condensing water outlets.
• Condensing water outlets become visible when the base plate is detached. Pull forward the conden-
sing water reservoir - if there is one - and detach it for emptying and cleaning.
• If a condensing water outlet is in use, check it and ensure that it is not clogged.
