Evaporative Cooling Humidifier
Installation Instructions and User Manual
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Record and evaluate the results obtained during verifications, servicing and microbiological testing in order to
improve the control plan.
If the SKV Evaporative Cooling Humidifier is stopped for extended periods (over 24 hours), make sure the tank at the
bottom of the unit and the water supply hose to the unit are drained; unless there is a regular renewal of the water system.
Contamination of the water system can cause the development of Legionella bacteria that can be fatal.
Table 9 - Proposed plan of control and disinfection according to results of microbiological testing of water
Aerobic Heterotrophic Count (CFU/ml)
Required Action
10,000 or less
Acceptable control. No remedial action required.
More than 10,000 and up to 100,000
Run a disinfection cycle with chlorine dioxide; perform another microbiological test of
the water after the disinfection cycle. If the result is not reduced below 10,000 CFU /
ml or less, then perform a manual cleaning and disinfection and review the control
programming before restarting the Evaporative Cooling Humidifier.
More than 100,000
Immediately stop the machine, unmount the Evaporative Cooling Humidifier, perform a
manual cleaning and disinfection, and review the control programming before
restarting the unit. Corrective action should be undertaken to reassess the level of
hygiene control and a new risk analysis of the water network and system.
Disinfection
Before commencing a disinfection cycle, perform the following functions:
Assess the situation for any security risk with the person responsible for health and safety of the building.
Check records, namely, sample results of microbiological testing of water.
If possible, carry out disinfection when the building is unoccupied.
All surfaces that require disinfection or cleaning must be in contact with the same concentration of disinfection solution for
same amount of time. Ensure that the disinfection solution reaches all the ends of lines of the pipe-work. It may also be
necessary to disinfect the supply water system pipe-work or water treatment systems. Neptronic recommends routine
disinfection of the humidifier in the following situations:
At initial commissioning.
Depending on the results of the microbiological water testing and monitoring plan and sampling adopted (see
Table 9
above).
If the system or part of it has been shutdown and/or substantially altered, creating a risk of contamination.
During or following an outbreak, or suspected outbreak of Legionellosis.
Recommended Disinfection Equipment
Chlorine
dioxide
Chlorine
Disinfection Method Statement
Step 1 - Preparation
Refer to the
manufacturer's recommendations
for concentrations
for
applying
and
the method of preparation
of the solution.
o
When using chlorine dioxide, do
not
exceed
a
concentration
of
2.5mg
per liter of
water to be
disinfected
.
The
chlorine dioxide
is
effective
regardless of the
water’s PH level
.
o
When using
chlorine
, do not
exceed
a concentration of
0.5mg
per liter of
water to be disinfected
.
Note
the
concentration
of
chlorine
depends upon the
optimal
pH
of
the
water
.
Make sure that
the air system (
central air
or
ventilation system
)
is stopped
Make sure
the SKV Evaporative Cooling Humidifier
is stopped
.
