14
Hygienic requirements
General points
The requirements of the above-mentioned regula-
tions describe a minimum hygiene standard for ven-
tilation and air conditioning systems. The guideline
formulates requirements that must be met during the
planning, execution, operation and maintenance of air
handling systems in order to ensure hygienic operation.
VDI guidelines are part of the technical regula-
tions and describe the state of the art. In the event
of a dispute, these rules are used as a bench-
mark for compliance with the state of the art.
DIN 6022 applies to all air handling systems and units
and their central and decentralized components that influ-
ence the supply air quality in occupied rooms in buildings.
In developing the Klingenburg humidifier, Klingenburg
paid particular attention to ensuring that the design
was flawless from a hygienic point of view, and had
this tested and confirmed by a type examination car-
ried out by the DMT Test Center for Air Hygiene, Essen.
However, in addition to the humidifier design, the fun-
damental prerequisite for hygienically flawless op-
eration is the fulfillment of all requirements of VDI
6022 and VDI 3803 Part 1 with regard to the de-
sign, operation and maintenance of the entire air
handling system in which a humidifier is integrated.
Design of the system
All requirements of VDI 6022 and VDI 3803 Part 1 regard-
ing the design of the overall system (sequence of compo-
nents, filter classes, etc.) must be taken into account.
The air velocity must not exceed 3.5 m/s.
Controller System
The Klingenburg control unit enables periodic flushing of
the nozzle blocks and the water-carrying lines when the
humidifier is not in operation for a longer period of time.
See the Control section. In addition, the control of the sys-
tem must be designed to meet the requirements of VDI
6022.
Water supply
The feed water must at least meet the microbiologi-
cal requirements of the Drinking Water Ordinance
and the requirements of VDI 3803 (Tables A1 and A3).
Only water from reverse osmosis (permeate) between. 5
- 20 µS/cm and a water hardness <1°dH is to be used.
The water-carrying pipes are to be made of corrosion-re-
sistant materials, such as plastic or stainless steel.
The operator is responsible for ensur-
ing that the water is free of particles.
If the humidifier is shut down for more than one day,
the water treatment buffer tank must be emptied.
The humidifier tank is designed with a slope on all sides to the
drain point. The slope in the air direction is at least 50 mm/m,
against the air direction 250 mm/m and laterally 10 mm/m.
The wastewater drain is to be equipped
with a suitable siphon and an open outlet.
Biocides (e.g. hydrogen peroxide) for the disinfection of
supply water may only be used if it can be ensured that
no residues of these substances can enter the supply air.
The supply water should be test-
ed regularly (e.g. every 6 months).
If the humidifier is disinfected with biocides
or similar substances, the absence of resi-
dues must be ensured before commissioning.
Inspection
Before commissioning the entire air handling unit, an ini-
tial hygiene inspection must be carried out in accordance
with VDI 6022.
Maintenance / operation
See also the section Operation / Maintenance. To ensure
continuous hygienic operation over the entire humidifica-
tion period, the measures prescribed in VDI 6022 must
also be observed.
In particular, we refer to the checklist described in VDI
6022.( Table 8 )
Failure to observe the above points will in-
validate the humidifier’s conformity with VDI
6022 and VDI 3803 Part 1.
Hygienic requirements of ventilation and air-conditi-
oning systems according to VDI 6022 and VDI 3803
Part 1
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