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8 - MAINTENANCE
8.8 ROTARY FILTERS
Every 6 months clean and lubricate the gear mechanisms and
check the tension of the gearing chain.
The filter is always fitted with a differential pressure switch and
electrical panel, for the "filter depleted" signal.
CAUTION: the access door to the filter zone is fitted with a
microswitch that cuts off power. See the safety standards.
8.9 RIGID AND NON-RIGID BAG FILTERS
The synthetic pre-filter bags are not regenerable, and can
thus be cleaned only a few times by shaking, after which
they must be replaced.
The high-efficiency bags, being non-regenerable, must be
replaced. To extend their duration, fit them with a cell pre-
filter.
The gasket, which must be intact and ensure a perfect
seal, should be controlled each time the filters are
changed, and replaced in the event of anomalies.
The four fastening springs must all be functional, as a fault
in even one of these may cause air by-pass.
When removing the bag full of dust take care to close the
air inlet side (for example, with a sheet of paper) so as to
avoid spilling the contents.
The bag filters are installed for operation in metal counter-
frames (galvanised - aluminium - stainless steel).
The counter-frame is fitted with a gasket glued to the lip of the
filter support, so as to ensure perfect air-tightness and
prevent any by-pass.
The filtering cell is fastened to the counter-frame using
"removable" springs, as shown.
8.10 ABSOLUTE FILTERS
The absolute filters fitted with gaskets are installed in special
metal counter-frames.
They are fastened using four tie rods with hand screws.
The tie rods can be removed: see the figure.
8.11 HEAT RECOVERY UNITS
The exchanger must be cleaned delicately and with care, as
the fins are rather fragile.
Clean using brushes, a vacuum cleaner or jets of water.
In the rotary recovery unit, also:
check the transmission belt (degree of wear and tension).
check the gear motor.
grease the supports.
8.12 WATER COIL
Completely discharge the air contained in the pipe through the
relief valve, repeating the operation periodically.
Wash the exchanger with jets of water at the start of both
seasons, so as to prevent deposits.
For best results in removing deposits, use brushes or suitable
chemicals, with great care.
This operation, which involves a number of difficulties, must
be performed with maximum care and without haste.
Check and periodically clean the condensate collection basins
and humidification tanks.
Clean the corresponding drain traps and check that they
always contain water.
8.13 TANKS
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