13
061629 •
Ver
sion
1
.0 •
25.0
2.200
9
Preventive maintenance
Introduction
To keep the heat exchanger fit to meet the specifications, preventive maintenance has
to be carried out.
The unit needs preventive maintenance with specific intervals to avoid breakdown or
inefficient operation and to maximize the lifetime. It is important to notice that interval
between maintenance can vary depending on the specific environment.
The following parts need preventive maintenance:
•
Heat exchanger
•
Fans
The maintenance instructions are listed later in this section.
Caution
•
Only trained and certified technicians are allowed to service the fans
•
Switch of both the DC and AC supply before working on the unit
•
Make sure that all work has been performed before switching on the power again
Intervals
The recommended preventive maintenance intervals should not exceed 6 months.
Preventive main-
tenance
Please follow this procedure to carry out the preventive maintenance:
Step
Action
1
Clean the fans, either vacuum clean or use compressed air with caution
2
Check the fans and the fan blades for cracks and abnormal noise – ex-
change if necessary
Clean the fan blades with compressed air or with a brush. Each blade has to
be so clean that the fan stays balanced. Take care not to remove the balanc-
ing pieces attached to the fan blades.
3
Clean the cross heat exchanger:
If the cell is contaminated clean with a brush and a vacuum cleaner
4
Switch on the power again.
In case of an alarm signal, please see section “Fault finding guide”, page 21
Drip tray
Make sure that the water outlet is not clogged.
Condition for war-
ranty
The factory warranty is only valid if documented preventive maintenance has been car-
ried out with an interval of maximum 6 months. The documentation could be in form of
a written log.
