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e-MovAir-IOM-20.04-EN
complete block of the unit. Failures can be divided as follow:
COMPONENT TO BE INSPECTED AND PROCEDURE
AIR MIXING DAMPERS
The extruded aluminium dampers with nylon gears, not having parts subject to
rust, do not require special maintenance, but rather simply normal cleaning.
AIR MIXING DAMPERS
The galvanised steel dampers with movement levers must be cleaned and greased
at the pins and the levers.
AIR MIXING DAMPERS
The dampers located outside require more frequent maintenance.
FILTERING SECTIONS
The pressure drop of the filters increases proportionally as they become
fouled, and therefore the filters must be cleaned or replaced according to the
concentration of dust or pollutants in the air. This operation is simplified if the unit
is fitted with a differential pressure gauge to visually or audibly signal the pressure
drop, otherwise proceed empirically based on experience, establishing, on a case-
by-case basis, the frequency of the operations. The unit must not be operated
without filters. Pay special attention when reassembling the filters, so as to avoid
the unwanted "bypass" of air.
REGENERABLE PLEATED SYNTHETIC PRE-FILTERS (G3/ G4)
Cleaning is performed:
by simply shaking,
with compressed air or a vacuum cleaner,
by washing with a jet of water.
Replacement is left to the judgement of the maintenance personnel, however
it is recommended when the filter, after cleaning, remains dark in colour and the
layer is no longer transparent when held up to the light.
NON-RIGID AND RIGID BAG FILTERS (EPM10 50% / EPM1 85%)
These filters are not regenerable and, after cleaning them a few times by shaking,
should be replaced, checking the gasket that must be integral and ensure perfect
seal, and therefore replaced if necessary. The fastening springs must prevent the
bypass of air.
The filters should be replaced when the pressure differential exceeds 250 Pa
(average value).
When removing the dirty bags, close the inlet side so as to avoid spilling the dust
contained inside. In this regard, the normal assembly of the filter allows the removal
of the dirty bag from the air inlet side, except in cases where the configuration of
the unit or the size limits do not allow.
CONDENSATE COLLECTION PANS
The water collection pans, always installed below the cooling coil sections, must
be periodically washed to remove any deposits and dirt.
An excessive accumulation of dirt may cause corrosion that attacks the internal
insulation of the pan and, consequently, the metal.
e-MovAir-IOM-20.04-EN
22
AVERAGE
FREQUENCY
Yearly
Yearly
Quarterly
Monthly or
fortnightly for
especially dirty
air
Monthly
Monthly
According to
limit DP
Monthly
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