DE / 06-2016 / 1000687
© STULZ GmbH, Hamburg
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72
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Maintenance
STULZ UltraSonic -System for duct humidification ENS 14 A - 18 A-
11.2. Checklist for hygiene checks
Checklist for hygiene checks
Job to be performed
Necessary measures
Inspection interval*
Plant
operator
Visual inspection as follows:
When required:
1x
week
3
months
6
months
• Check mist outlets for deposits
Clean
X
• Check transducer for deposits
Inspect, replace if necessary
X
• Check drain/drainage valve
Clean and service
X
• Check integrated ENS
water tray for impurities,
damage, microbial
growth and corrosion
Rinse and dry tray, disinfect, check quality of
supplied water
X
Indicative measurement of colony count
Dip slide test as per VDI 6022 Page1< 10
2
CFU/ml
X
Specialist engineer
1)
Determination of total colony count of
Legionella, Pseudomonas aeruginosa
Qualified sampling
1)
as per VDI 6022 Page1
Colony count < 150 CFU/ml
Legionella < 100 CFU/100ml
Pseudomonas aeruginosa < 100 CFU/100ml
X
1)
Qualified sampling within the meaning of the Directive refers to sampling for the purpose of risk assessment at the system boundary to the room. It must entail
expert microbial sampling in accordance with Objective G or DIN EN ISO 19458. If further sampling points
are required (e.g. after reverse osmosis). If microbial sampling to assess the water-bearing system must be performed in accordance with Objective B
as per DIN EN ISO 19458. A sampling tap will be required for this purpose.
CAUTION
Separate logbook.
All tests and measurements must be documented in a separate logbook.
Note
CAUTION
Shortened inspection intervals.
If the specified recommended values are exceeded, the inspection intervals described here must be
halved until the results of inspections are no longer critical and remain so over the long term.
Note
CAUTION
Adjustment of inspection intervals.
If the recommended values are met over a period of at least one year, the inspection intervals can
then gradually be adapted.
Note
CAUTION
Measuring sensor and control unit.
Ultrasonic humidifiers distributed around the room must generally be equipped with a control unit.
Note
CAUTION
H
ygiene
.
Also see "4.10. Use in conformity with VDI 6022" on page 22.
Note
Summary of Contents for ENS 14 A
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