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MAINTENANCE
Maintenace
IMPORTANT. BEFORE CARRYING OUT ANY CLEANING OR MAINTENANCE OPERATIONS ON THE UNIT MAKE SURE
THE POWER IS DISCONNECTED. ANY ROUTINE OR EXTRAORDINARY MAINTENANCE OPERATIONS GIVEN BELOW
MUST BE CARRIED OUT BY SPECIALISED AND AUTHORISED PERSONNEL IN ORDER TO ENSURE COMPLIANCE WITH
THE CURRENT SAFETY REGULATIONS.
This section is extremely important for lasting efficiency of the unit. Just a few operations performed periodically can prevent
having to resort to interventions by specialised personnel. The operations to be carried out do not require particular technical
knowledge and consist of simple checks of the unit's components.
Heat exchangers
Accidental contact with the exchanger fins can cause small cuts. Use special gloves to carry out the operations described below.
The exchangers must be able to ensure maximum heat exchange, therefore their surfaces must always be free of dirt or dust
which could form on them due to the action of the fans. Use a brush to remove all the impurities deposited on the surface of the
exchanger. Use a compressed air jet to clean the aluminium surface of the exchanger, making sure to keep the jet parallel to the
direction of the fins so as to avoid possible damage. If the aluminium fins have been bent, "comb" the exchanger with a special
tool to eliminate any damage.
External fans
Before every seasonal start-up, check the fixing of the fans and respective grilles to the vibration-damping mounts and that these
are properly secured to the structure of the unit. Insofar as possible, check any unbalance in the electric axial fan indicated by
anomalous vibrations and noise.
Structure
To prevent possible anomalous vibrations and noise, make sure the various steel parts are secured and that the various inspection
panels are properly fixed to the unit by means of the special ¼ turn closures.
In case oxidation, treat the relevant parts of the unit with paints suitable for eliminating or reducing the problem. Periodical cleaning
of all the internal metal surfaces in contact with the treated air is also advisable to limit the risk of Legionella.
Electrical part
Make sure there are no cuts, cracks or alternations on the power cable connecting the unit to the distribution board, that could
compromise its insulation. Contact an authorised assistance centre if maintenance is necessary. Carefully check the tightness of
all the electrical connections after an initial period of operation from first start-up and at every seasonal start-up or stop.
Air ducts
Make sure the fixing screws of the air ducts and the relevant structures are not loose. Loose screws are the source of vibrations
and therefore noise. Check any vibration-damping systems installed on the air ducts to prevent the transmission of vibrations.
Internal exchanger condensate discharges
It is advisable to periodically check the state of the condensate drain tray and connections of the direct expansion coil and the
collection tray and union present with the optional drip separator or the water coil. Dirt or deposits could give rise to dangerous
clogging. Periodical cleaning of all these components in contact with the treated air is also advisable.
External exchanger condensate discharges
In winter operation, defrosting of the external exchanger through reversing the refrigerating cycle occurs periodically. During this
phase make sure the water dripping from the finned pack can flow down regularly under the level of the machine and in particular
that the drain union, fitted standard on all units, is not blocked. If the downflow is not correct, with particularly rigid temperatures a
layer of ice could form over the base and compromise operation of the entire system.
Water coil (optional)
In the winter period always empty the water present in the finned-pack exchanger, when not used, by means of the special drain
valves located at the bottom of the manifold and the exchanger itself. This operation prevents ice forming with consequent brea-
kage in case of particularly low outside temperatures.
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