Nortec ME Direct Feed - Manual (Page 31)

31 Maintenance
5.8 Cleaning and Disinfection
Before commencing cleaning and disinfection:
For systems in operation or where the water quality or air quality is poor, it is recommended to disman-
tle and scrub the system clean, to carry out a disinfection of all parts of the evaporative module with
a minimum of 50ppm chlorine or an appropriate disinfection solution. Please refer to the cleaning and
disinfection and method statement section to ensure that the relevant chemicals, equipment and Personal
Protective Equipment are available to carry out disinfection.
1. Risk assess the situation. This should include but is not limited to observance of local regulations
and the use of PPE, working from heights and ensuring a full understanding of the Nortec ME Direct
Feed .
2. Coordinate with relevant responsible persons.
3. Check records (i.e sample results of microbiological control) for system history.
4. If possible, disinfection should be carried out when the building is unoccupied, with air flow off.
Evaporative humidifiers must be regularly cleaned and maintained, to prevent contamination especially
in industrial environments.
All surfaces requiring disinfection or cleaning must be in contact with the appropriate concentration of
disinfection solution for the correct contact period. The method statement for disinfection may need to
be adapted depending on the layout of the humidifier pipework. Additional procedures will be required
for supply water system pipework or water treatment systems prior to the humidifier.
Nortec Humidity Ltd. recommends that routine disinfection should take place in the following situations:
• At six monthly intervals as part of the maintenance regime.
• If the system or part of it has been shutdown and/or substantially altered creating a risk of contami-
nation.
• During or following any increase of bacterial activity (as per recommendations in chapter 5.7 – Rou-
tine Water Sampling and Testing) or outbreak or suspected outbreak of Legionellosis.
Recommended Disinfection Equipment
– Disinfection solution in accordance with manufacturers guidelines.
– Disinfection neutraliser (only if necessary).
– Disinfection solution test kit (to measure strength).
– Bucket of fresh water.
– Cleaning equipment.
– Mixing vessel / Measuring container.
– Risk assessment / test record sheets. Appropriate report/record
– Standard tools
– Appropriate PPE
– COSHH risk assessment / MSDS