W.Tech RAA Series Installation And Maintenance Manual - page 13
Pag 11
Fig. 10
7.1.6
Coil
The coil has to be observed regularly. It has to be considered that this is a key element in the performance of the tower.
Therefore, due to the possibilities of scaling, a monthly check is recommended and a daily purge of part of the spraying water.
7.2
In the air flow system
The airflow system does not require any special attention, due to its strength. Nevertheless, like any other moving element it has to be
regularly checked, following the instructions below.
7.2.1
Motors
Motor maintenance is essentially limited to keeping winding and cooling ducts clean, as well as attending bearings. If the
motor has grease-lubricated bearings, also perform this lubrication.
The casing temperature that can reached approximately to 90 or 100°C, a temperature that the hand cannot resist might lead
one to think that the motor is not operating correctly. It is not necessary, as was the custom in the past, to take the casing
temperature as the only indicator to determine correct motor operation.
7.2.2
Fans
A monthly inspection has to be carried out, in order to remove any paper, leaves or any other elements which could enter the
impellers.
7.3
Casing and water collection basin maintenance
The tower has to be checked and cleaned twice at year at least. The basin needs cleaning periodically, since otherwise the drain
outlets, overflows, valves and circulation pumps would become blocked.
We recommend draining and cleaning each month, or as often as necessary, in accordance with the legislation in force, so as to
prevent the build-up of sediment.
At least twice a year the casing will be checked, as well as cleaning the tower external and internally.
If any corrosion is appreciated, proceed in the following way :
1
Clean the affected zone by means of a steel brush.
2
A zinc layer has to be applied
3
Apply an Aluminium layer over the zinc layer.
7.4
Drift eliminator
A general cleaning should be carried out twice a year at least, proceeding to its substitution if necessary.