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14 - MAINTENANCE
Air fi lters in the grids of the electrical cabinet
■ The appearance of the fi lters located
inside of the grids must be examined
periodically, because the clogged fi lters
impede good ventilation.
■ Cleaning can be done with a household
vacuum cleaner. Replace them
regularly.
115 x 115 mm G2 fi lters.
Air fi lters in the recovery module
■ The inside of the heat recovery unit module is accessed via the
left-hand panel (front view), for maintenance tasks concerning
the fi lters and the condensate pan. This panel features dual
locks.
The access panels to the fi lters are secured using M4 Allen
screws. The procedure for cleaning the fi lters is described In
the preceding paragraph.
Note: gravimetric fi lters G4 on the fresh air intake can be
replaced by G4 with low pressure drop (l.p.d.) or G4 + M6.
Left-hand panel
Drain
connection
Filters on
the exhaust
air outlet
Access panel to fi lters,
M4 Allen screws
Wheel
Filters on the
fresh air intake
Air fi lters
■ Depending on the installation conditions, the fi lter aspect must
be examined to defi ne the cleaning or replacing periodicity.
Spare parts should be planned for.
The pressure drop data of the technical catalogue are given for
clean fi lters. Cleaning the fi lters is very important to maintain
the required available pressure of the unit.
On units with fi lter fouling detection with diff erential pressure
switch, an alarm is triggered on the electronic control when the
factory-set clogging threshold is exceeded depending on the
combination of fi lters selected.
■ Gravimetric fi lters (G4):
- Cleaning can be done with a household vacuum cleaner.
Replace them regularly.
■ Creased opacimetric fi lters (M6, F7, F8 and F9):
- It is necessary to replace them.
■ The access panel to the fi lters features dual
locks which can serve as a hinge or can be used
to remove the panel. Check that the locks are
not blocked. Open the locks with a 4 mm Allen
key (in an anticlockwise direction).
Filter removal:
Caution: pay attention when opening the panel to avoid any
damage to the siphon of the condensate drain.
■ The thickness of the frames is 25 mm for the G4 standard type
and 50 mm for the G4 low pressure drop and all opacimetric
fi lters.
Filters supplied from the factory can be replaced on site by
other types of fi lters with diff erent thickness.
The filter holder structure supports the following filter
combinations: 25 mm, 25 mm + 50 mm, 50 mm + 50 mm.
■ The fi lter holder structure incorporates a tensioner that can be
moved along a guide to adjust the width according to the chosen
combination. With the help of a locking knob, the position of
the frames is locked after placement.
To extract the frames from each row, simply slide the tab.
Tab for displacement
of the frames
Tensioner
Locking knob for
the tensioner
Guide
Centrifugal fan (optional)
■ Verify that the turbine and the motor remain clean.
■ Foresee having a spare belt set for the fans.
■ The motors and the fans have bearings that have been
lubricated and sealed and, thus, do not need further lubrication.
Mixing boxes (optional)
In units with mixing box assemblies, it is advisable to check the
condition of the servomotors of the motorised dampers.
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