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10. Maintenance
10.1 General
For the achievement of a long unit life span,
regular maintenance is a must. Maintenance
works to be performed refer to unit assem-
blies that underlie either mechanical or elec-
trical wear and tear, or may be impeded by
residues in their proper functioning.
The steam humidifier's performance and
maintenance intervals primarily depend on
the water quality encountered and the
amount of steam produced. A particular
water quality may shorten or lengthen main-
tenance intervals. The amount of residues
found in the steam cylinder allows for a hint
on future maintenance intervals.
Another scenario influencing the unrestricted
unit availability refers to the main contactor
that has a maximum number of switch cycles
as indicated by its manufacturer. Unit control
monitors the number of switch cycles and
produces a maintenance message as soon
as the max. number is reached.
Need for maintenance is indicated by illumi-
nation of the service icon in the unit con-
trol panel display. The reading value r16
„Service message“ then shows a „1“ (Service
Steam Amount) when a certain produced
steam amount threshold preset was
exceeded, or „2“ (Service Main Contactor
K1).
In the latter case, the main contactor should
be replaced and the counter be reset (s.
parameter „3-2“).
In case of „Service Steam Amount“, mainte-
nance work mainly encompasses checking
and cleaning all of the unit parts including the
steam cylinder inside, and a unit test run.
Steam humidifier electrodes are prone to
burn-off during steam production and must,
consequently, be replaced in a regular time
frame.
As part of the maintenance work, screw ter-
minals and plug connections must be
checked every time. If required, retightening
the teminal screws is a must as well as
ensuring tight fit of all of the plug connec-
tions.
Seals are wear parts. As such, seal integrity
checks and replacement, if required, is also a
part of the regular maintenance work.
10.1.1 Safety instructions for mainte-
nance
Risk of electrical shock!
Hazardous electrical voltage. Unit must be
switched off and protected against restart by
expert staff (electricians or expert personnel
with equivalent training) before any mainte-
nance work is commenced.
Risk of skin burning!
Hot steam cylinder during operation and for
some time afterwards.
Drain steam cylinder before any maintenance
work is commenced. After that, wait approx.
10 mins before starting maintenance work.
Check steam cylinder temperature by cau-
tious approximation with hand (do not
touch!).
Risk of scalding!
Water pumped or drained from the steam
cylinder may have a temperature of up to
95 °C (203 °F).
Wear proper PPE (Personal Protection
Equipment)!
Take care of ESD protection!
The electronic components of the humidifier
control are very sensitive to electrostatic dis-
charges. In order to protect these compo-
nents during maintenance, steps must be
taken to guard against damage from electro-
static discharge..
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