Nortec NHDI - Manual (Page 22)

Note: The heating elements do not have to be entirely
free from scale.
Then rinse heating elements thoroughly with fresh
water.
Warning! Ensure that the electrical connections
remain dry.
Warning! Do not remove scale coating on the
heating elements with tools (screwdriver, scraper, etc.)
or by striking. This could damage the heating
elements.
Cleaning the interior of the unit
Wipe down components inside the unit with a
damp cloth (clean water). Severely scaled
components, e.g. the inlet funnel and the blow-off
pump, should be cleaned using commercially available
cleaning and descaling agents.
Warning! The electrical connections and
electronic components must remain dry.
Notes on Cleaning Agents
Warning! Formic acid is harmless to the skin but it
attacks the mucous membranes. Protect the eyes and
respiratory tracts from contact with the acid and its
vapor (wear goggles and work in a well ventilated
room or outside).
The use of disinfectants is only permitted if they
leave no toxic residues. The components must be
rinsed thoroughly with water after cleaning in all cases.
Caution! Do not use any solvents, aromatized
or halogenized hydrocarbons, or other aggressive
substances for cleaning purposes.
The information and instructions regarding
cleaning agents are to be strictly observed and
implemented. In particular: Information relating to the
protection of personnel, environmental conservation
and restrictions regarding usage should be adhered to.
In all cases, local regulations relating to
environmental protection must be implemented.
To reset the maintenance indication
When maintenance work has been completed, the
maintenance display can be reset as follows:
Turn on the service switches in the main supply
line.
With the unit switched off depress and hold the
drain switch.
Turn on the humidifier with the unit switch.
Continue to depress the blow-off pushbutton until
the system test has finished (approx. 10 seconds).
FAULT ELIMINATION
Fault indication
In case of malfunction during operation, the
humidifier control checks whether there is a temporary
problem (e.g. water supply interrupted for a short time)
or whether it can resolve the problem by taking
necessary measures. Such malfunctions set the unit
into the “Alarm” status (fault elimination). The red
LED flashes and an alarm message appears in the
display alternating with the notice “recovering -
please wait”.
Note: If the cause of the malfunction disappears of
its own accord or if the controls can repair the
malfunction, the alarm message will automatically
switch off.
Note: If the unit is in display or setting level the
alarm message in the display will be suppressed.
If the controller, after several attempts, fails to
solve the problem (number of attempts depends on the
type of malfunction) or if the problem obstructs further
operation, the heating voltage is interrupted via the
main contactor. The red LED stays lit and an error
message appears in the display alternating with the
notice “Please turn off unit”.
Note: If the unit is in the display or setting level the
error message in the display will be suppressed.
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