WEGER WALTER GMBH DIWER EVO DP80 Series, Installation And Operating Manual

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Installation and Operating Manual Page
51
Printed: 02/2015
7.5. Humidifier
The water fed to the humidifier must meet the microbiological quality requirements laid down
in the Drinking Water Regulations. Ensure that the water can under no circumstances be fed
back to the drinking water distribution network.
It is not permissible to connect water drains directly to the waste water system
The humidifier must be automatically shut down as soon as the air handling unit is switched
off or is otherwise de-energized.
A supply line control system must ensure that the humidifier chamber is run dry before the
humidifier is shut down.
In units with humidifiers, ensure that no condensate is produced downstream of the
humidifiers in the event of an air handling unit failure or if there is insufficient supply air flow.
In such a case, the relative air humidity in the supply line system must not exceed 90%.
7
.
5.1. Surface humidifier
Pump
The pump is maintenance-free. Defective pumps must be replaced. For a long service life of
the pump, ensure the following:
- Never let the pump run dry.
- Prevent solids from entering the pump.
- Avoid prolonged standstill.
- We recommend switching on the pump every 2 days for approx. 2 minutes.
If the unit is to be shut down for more than 48 hours, the surface humidifier must be emptied
and cleaned.
The fresh water supply must be adjusted so that the volumetric flow rate is lower than the
maximum overflow rate at all times and under all operating conditions.
7.5.2. Steam humidifier
For the maintenance of the steam humidifiers, follow the instructions of the manufacturer. In
general, these devices are virtually maintenance-free, requiring only regular checks of the
demister and the tray.
Take suitable measures to ensure that there is no condensation even in the event of a failure
of the air handling unit or if the supply air flow rate is too low.
To prevent condensation in the air duct system, configure the supply fan to run with
sufficiently long lead-in and Run-on times before/after switching the humidifier on/off
(recommended time: 10 minutes).