TCF Termoventilatori Condizionatori Felsinea Srl
40057 Cadriano di Granarolo Emilia (Bologna), via Giuseppe di Vittorio 5
www.tcf.it
10
5.
MAINTENANCE
5.1
FOREWORD
TCF recommends that its customers carry out PREVENTIVE
MAINTENANCE on the air-conditioning units in order to
ensure a long-term efficiency.
Such air-conditioning units require little maintenance and
have been designed to make each operation as easy and safe
as possible.
5.2
FILTRATING SECTIONS
The filtrating sections require the most frequent maintenance
in order to:
-
ensure that the air is filtered with the required
efficiency in the treated environment;
-
prevent the components of the air-conditioning unit
from damaging
5.2.1
Reconditionable synthetic filters
These are cells measuring 50 or 100mm in thickness, also
known as PREFILTERS, which offer the advantage of being
reconditionable.
The RECONDITIONING may be performed using two different
methods, depending on the type of dust to be treated:
-
in case of DRY DUSTS, a compressed air jet has to be
directed against the filter in the opposite direction
to normal operation
-
in case of WET DUSTS, the filtration diaphragm has
to be washed (without removing it from the frame),
if necessary using domestic detergents. To avoid
damaging the filter, the temperature of the water
must not exceed 50°C. Do not use solvents or caustic
soda. Let the diaphragm dry by evaporation and
refit it only when it is perfectly dry.
TCF recommends TO CHECK THE CONDITION OF THE
FILTERS ON A WEEKLY BASIS.
THE PREFILTERS MUST BE RECONDITIONED EVERY 7-20
DAYS depending on the type of environment being treated.
After 7 to 10 reconditioning operations, the diaphragms will
tend to deteriorate and its original characteristics will be
impaired; it should therefore be replaced.
5.2.2
Non-reconditionable bag filters
These are filters with an efficiency between EU5 and EU9.
They CANNOT BE RECONDITIONED as this would damage
their dirt accumulation capacity and efficiency.
In order to preserve the filtration diaphragm as long as
possible, the condition of the prefilters must be carefully
monitored.
Moreover, TCF recommends to check the state of the gaskets
of the frame and the springs every week, to prevent air from
by-passing the bag without being filtered.
5.2.2.1
Replacement load loss chart
TABLE 2. Pressure drop to substitute the filters
5.3
HEAT EXCHANGERS
5.3.1
Water heat exchangers
In order to maintain an optimum water/air heat exchange,
the following MAINTENANCE OPERATIONS must be
performed regularly on the exchangers:
-
At the beginning of each operating season, remove
the air present in the heat exchanger circuit using
the relevant air relief valve;
-
At the beginning of each operating season, remove
dust and deposits from the finned pack. Proceed as
follows:
1.
use a jet of compressed air in the opposite direction
to the air flow during normal unit operation, or
2.
wash the finned pack with water, non-corrosive
components and a wire brush
-
Remove any deposit from the condensate drain pan.
This operation must be repeated every month in
order to prevent flooding of the machine and of the
room where it is installed.
To avoid causing irreparable damage to the heat exchangers,
you must make sure that the primary fluid will not freeze
when winter comes. For this purpose TCF recommends the
following steps:
-
in case of prolonged standstill of the heat exchanger
circuits, they should be completely drained
-
where an anti-freeze system based on heating
elements is provided, to protect the exchanger,
make sure that the control board is constantly
powered;
-
on systems operating with anti-freeze mixture,
check their efficiency and fill them up or replace if
necessary
ANTI-FREEZE
LIQUID
MUST
NEVER
BE
INTRODUCED INTO A CIRCUIT NOT SPECIFICALLY
SIEZED FOR THIS PURPOSE as it would jeopardize
the correct operation of the pump and the efficiency
of the heat exchanger.
5.3.2
Extraction of the heat exchangers
Frequently insufficient space in the room makes it often
impossible to carry out the necessary maintenance on the
heat exchanger while installed inside the unit.
In these cases it is necessary to extract the exchanger, an
operation which calls for the utmost care.
To remove the exchanger you must: