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[MBA_NKBD_EN] Rev.: 10/2015
No liability accepted for translation or printing errors. Subject to changes in dimensions, weights and other technical data.
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BOGA GmbH
• Werkstraße 16 • D-59494 Soest • Fon: +49 2921 96943-0 • Fax: +49 2921 96943-29 • [email protected] • www.airwin.net
19. Protection against overvoltage peaks
To secure the electronic devices of the NKBD against transient overvoltage
peaks, a suppressor diode was soldered onto the bottom of the control board.
Suppressor diodes are components to protect inputs and outputs of electronic circuits against short-term
overvoltage peaks that may occur due to switching operations in the network or close to lightning.
In case of long-term overvoltage peaks or major performance-based overvoltage peaks, the diode will switch
to permanent short circuit which will then trigger the FI switch in the system.
For a restart of the humidifier, the diode must be replaced (no. 46 exploded diagram on page 36).
20. Care
It is essential that the NKBD is easy to inspect and easily accessible on site.
Good accessibility and exchangeability of the NKBD save costs!
Prior to opening the NKBD, it must be disconnected from the electricity and water supply.
Then remove the body duct support. In case of pollution, the fluid tank of the NKBD must be cleaned by
using a clean, medium hard brush and clean water. The transducers must be wiped clean with a soft,
scratch-free cloth. Incrustations or solid deposits on the transducers must be carefully removed. For that
purpose, it is recommended to use 20 % formic acid.
Deposits are a direct consequence of inadequate water quality!
The care intervals depend on the respective degree of contamination of the humidifier. It depends directly on
the cleanliness of the intake air and the feed water quality. It may be necessary to perform care at shorter in-
tervals.
The performance of the ultrasonic transducers decreases with actual operating hours. The life time of the
ultrasonic transducers will be shortened by unfavourable operating conditions e.g. water and air pollution or
overvoltage.
