Vitrifrigo MACS Serie Manual página 90

18. ORDINARY MAINTENANCE OF THE SYSTEM
Here are the maintenance operations to be carried out on the various components of the air conditioning
system.
Return air grille
First, ensure that the return air grille is not obstructed by any kind of object.
The air filter (located on the face of the AC unit's heat exchanger or behind a return air grille) should be
periodically checked, cleaned or replaced. The frequency of its maintenance depends of the AC unit running-
time and the quality of the air.
Cleaning the return air filter is fundamentally for the right operation of the AC unit. In fact, a dirt air filter can
cause a decreasing AC unit efficiency in cooling mode, and even the block of the system in heating mode, as
a result of a too high cond. pressure due to the lack of air flow through the heat exchanger. In any case, we
recommend to clean or replace the filter every time you start your air conditioner after a long period of
inactivity.
If a return air filter grille is used, please remove the filter on the AC unit (if present).
Air distribution grille(s)
If in the air distribution circuit there is only one supply grille (and it has adjustable fins to guide the flow),
verify that it is never closed during AC unit operation.
If there are more air supplies (one primary and the other secondary), please ensure that main supply grille is
always open. The other grilles, which could generally be placed outside of the main room, can be closed if
you want to have a greater airflow into the main cabin.
Sometimes the closure of one or more supply grilles, thus reducing the airflow, can cause ice formation on
AC unit heat exchanger in cooling mode, or an high pressure alarm in heating mode.
Condensate collection and drain system
In the stainless-steel basin or in the condensate drain pipes can be algae or other impurities than can block
the condensate drain system, preventing the proper condensation-water flow. Therefore, it's necessary to
periodically check the status of the basin; if it contains a significant amount of water, this can mean that the
drain lines were not placed correctly or that they are obstructed. In this case, clean basin and pipes, eg. using
a solution of water and bleach.
Sea water filter
The sea water strainer on the pump suction line is used to prevent that algae, leaves and other objects in the
sea water come into the pipes, pump or heat exchanger, causing possible failures.
A low sea-water flow (resulting from strainer clogging) can cause the block of AC unit in cooling mode (due
to high cond. pressure) or a lower efficiency in heating mode.
To avoid these potential problems, make sure that water flow in the sea water circuit is always appropriate,
and clean strainer frequently. The frequency of its maintenance depends on the running-time of the AC unit
and the quality of the sea-water.
Sea water pump
Generally, the sea-water pump is not self-priming, so it must be primed after installation. If correctly installed,
you have not to re-prime the pump, unless there is an interruption of the water-flow.
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