US
ER
G
ENER
A
L
S
PE
CI
A
LI
S
T PER
S
O
NNEL
9
EN
EN
KWL Hygrobox KWL HB.. EH/WW
Installation and Operating Instructions
7. Functional description
The air humidification unit works on
the natural evaporation principle and
ensures a constant relative air humidity,
adjustable in the range from 40 % to 60
% relative humidity. The unit works auto-
matically and the humidity is electroni-
cally monitored in the device. Thus, the
indoor air cannot be over-humidified.
The air humidification unit KWL HB
250is dimensioned for a maximum
operating air volume flow of 250 m³/h,
and the KWL HB 500 is dimensioned for
a maximum operating air volume flow
of 500 m³/h. The water tank is supplied
with drinking water from the central
water supply. Based on the evapora-
tive power, a maximum of 2.5 litres of
water, which is continuously replaced, is
located in the tank for KWL HB 250 and
a maximum of 15 litres of water for KWL
HB 500.
The maximum filling level is limited
using a floating switch and mechani-
cal overflow. The water in the tank is
continuously disinfected using UVC light,
whereby the UVC pipe illuminates the
complete water tank and evaporation
surface. The UVC pipe has a radiant po-
wer of 4.3 watt at a wavelength of 253.7
nm. For safety reasons, the UVC pipe is
monitored by UV diode. This monitoring
process can detect a failure, contamina-
tion or line breakage in the disinfection
unit. If the radiant power is too low, the
water is drained and an error message
is output. The unit is automatically shut
down in case the UVC pipe malfunctions.
To prevent deposits during operation,
especially scale deposits on the bladed
rotary evaporator and the water tank,
the standard version of the air humidi-
fication unit is equipped with a reverse
osmosis unit. In the standard design, the
reverse osmosis unit is integrated into
the water inlet pipe between the soleno-
id valve and the water tank.
7.1 WORKING PRINCIPLE
6. Design variants
KWL-HB with warm water heater battery
(left version)
KWL-HB with warm water heater battery
(right version)
KWL-HB with electric heater battery
(right version)
KWL-HB with electric heater battery
(left version)
