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4
Function
The water to be treated flows through the stainless
steel radiation chamber, past the UV emitter. The
UV emitter generates UVC rays at a wavelength
of 254nm, which is particularly effective for disin
-
fection. This UVC radiation kills the germs in the
water safely.
A agitator is built in to the radiation chamber to
ensure that the radiation spreads equally to all
parts of the water.
The unit is controlled and monitored via an operation
monitoring window (10) and running time meter.
4�1
Design of UV units
UV unit design is primarily based on the following
parameters:
● Maximum flow (m3/h)
● UV absorption of the water to be treated at 254
nm:
Listed as SSK-254 nm (1/m) or UV transmission
based on a defined layer thickness (e.g. %/cm).
5
Installation conditions
5�1
General
Observe all applicable local installation regulations,
general guidelines and technical specifications.
The unit must be installed as described in the in
-
stallation/operating instructions in compliance with
AVB Wasser V, §12 (general requirements for the
supply of water in Germany) by a qualified water
supply company or by a party registered in the water
supply company’s index of fitters.
5�2
Installation site and environment
The installation site must be protected against
frost and kept free of chemicals, paint, solvents
and fumes. Neither the ambient temperature nor
the radiation temperature may exceed 40°C in the
immediate vicinity.
The floor of the installation site must have a suffici
-
ent load-bearing capacity if the unit is to be installed
on the floor.
There must be a clearance above the unit to facili-
tate emitter replacement (see dimensions).
If the cable length between the UV emitters and the
ballast unit is longer than 6 m, please consult our
technical department.
The emission of interference by the surrounding
electrical systems (voltage peaks, high-frequency
electromagnetic fields, interference voltages, volta
-
ge fluctuations, etc.) must not exceed the maximum
values specified in EN 61000-6-4.
5�3
Feed water
The hydraulic conditions must be such that a vacu
-
um can never form in the UV unit.
The Bewades unit has been designed and built
primarily for static loads.
Avoid pressure surges and fluctuating loads (e.g.
from pumps starting, pressure booster pulsation,
quickly closing valves, etc.).
Suitable installations for avoiding pressure surges
or fluctuating loads (e.g. expansion vessels, com
-
pressed air chambers, slowly closing valves, etc.)
must be installed externally.
5�4
Installation
Use corrosion-resistant pipe materials for installa
-
tion. Take corrosion-causing chemical properties
into consideration when different pipe materials are
combined (mixed installation).
A protective filter must always be installed upstream
from the unit to protect it from foreign particles.
In certain circumstances, the water must be pre-
treated. Depending on the operating conditions and
water quality, the water may be partially softened
to prevent deposits on the emitter casing tubes.
The emitter connection cable must be made as short
as possible. It may not be laid in loops.
5�5
Operation
In order to guarantee fault-free, safe operation of
the Bewades UV unit, technical consultation is re
-
quired before installation. During the consultation,
the rated transmission of the water to be treated
will be determined and the operating parameters
required will be set.
