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

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Installation and Operating Manual Page
52
Printed: 02/2015
7.5.3. Air washer
For the maintenance of the air washers, follow the instructions of the manufacturer.
7.5.4. Commissioning of contact humidifier
1. Recirculating water model (standard model)
The
WEGER surface humidifier is equipped with a tray (V2A) that feeds the water to the drain.
The water is fed to the humidifier through a mechanical float valve (2). The external ½" fresh
water connection (1) must be equipped with a ball valve. We recommend installing a water
filter in the supply line. The float valve is designed for an operating pressure of 1 to 3 bar.
At the pressure side of the pump, install the following manual control valves: one valve for the
control of the supply flow rate to the humidifier tube (6), one valve for the desludging (4) and
one valve serving as a bypass (13) for pump cooling.
The level switch (12) prevents dry-running of the pump.
Depending on the water quality, surface humidifiers should be emptied and cleaned regularly.
We recommend emptying the surface humidifiers once a day. Only refill the humidifiers when
humidification is actually required.
Water quality:
As water evaporates, mineral deposits consisting mainly of calcium and magnesium are formed
on the humidifier cells. Over time, these deposits might block the cells and contaminate the
tray.
Mechanical float valve (2):
Prior to commissioning, adjust the float valve as follows: Turn the adjusting screw to lower or
lift the floater. Adjust the floater position so that the float valve is opened before the water
level drops below the pump intake piece.
The float valve must close before the water level reaches the overflow level.
Pump (3):
Refer to the pump manual supplied with the unit.
Never let the pump run dry.
Dry-run protection - level switch (12):
The level switch must be configured to ensure that the pump is instantly stopped when it
starts to run dry.
Manual control valve for flow control (6):
The evaporation rate depends directly on the quality of the supply air. This determines of
course how much water is evaporated.
Adjust the evaporation rate so that the humidifier cells are well soaked. There must however
be no visible run-off at the cell surface.
Manual control valve in bypass (13):
This valve is used to control the pump cooling and should be opened by approx. 30% so that
there is sufficient cooling water recirculation. Proper cooling prolongs the service life of the
pump.