Nortec ME Control - Manual (Page 57)

57 Maintenance
6.8 Cleaning and disinfection
Before commencing cleaning and disinfection:
At initial commissioning we recommend the use of DISIFIN XL disinfection chemical. 1 sachet per 2 m
(6.6 ft) width of tank should be placed in the tank, allowed to dissolve and circulated around the system.
DISIFIN XL is 100% biodegradable, non-toxic and environmentally friendly and may be left to dissolve
and naturally flush away from the Nortec ME Control after commissioning.
Note: If your system is equipped with the optional conductivity monitoring the conductivity measuring must
be deactivated via “Disifin” function in the service menu (see chapter 5.5.2 – Performing maintenance
functions – “Service” submenu). Otherwise you may get a conductivity fault message, since DISIFIN XL
disinfection chemical increase the conductivity in the tank.
For systems in operation or where the water quality or air quality is poor, it is recommended to dismantle
and scrub the system clean, to carry out a disinfection with a minimum of 50ppm chlorine or an appropri-
ate disinfection solution circulated for 1 hour minimum or appropriate time. 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 Control .
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 initial commissioning (for brand new systems use DISIFIN XL disinfection chemical).
• 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 6.7 – Rou-
tine water sampling and testing) or outbreak or suspected outbreak of Legionellosis.