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52002_A_EN_1611
Nortec AF-22
basis. They are fulfilled when a Nortec clean water system is used. The AF-22 also has to be subjected to regular
inspection and preventative maintenance on a regular basis.
Definition of terms:
Untreated water:
This kind of water is water to be subjected to water treatment. Also known as
potable water
Soft water:
See also 4.3.2. This is water that has been softened
Treated water:
This kind of water is a product of water treatment. Another term for treated water is
reverse osmosis treated water (RO water)
Despite compliance with these requirements, contamination of the system cannot be excluded. Regular
checks carried out by the operator are obligatory in order to avoid health hazards.
4.3.1
Requirements regarding untreated water (drinking water or raw water)
The operator shall ensure that the following requirements are met on a permanent basis:
The water must be free of particulates > 5µ
The water has to be free from colloids and/or organic substances as a matter of principle
Well water, rain water and VE water are not admissible
The water must have drinking water quality (e.g. quantity of organic substances)
The maximum number of germs may not exceed 1000 germs/ml
It has to be free from chemical substances/additives (e.g. chlorine, ozone, disinfectants)
No accessory devices that alter the properties of the untreated water (e.g. dosing equipment) may be
used
Water temperature
43-68°F
(6-20 °C)
Flow pressure
43-58 psi
(2-3 bar)
Requirements regarding water treatment:
A three-stage water treatment system has to be used
Water softening (<0.1 °dH at the outlet)
Filtering (mechanical filter 5 µm + activated-carbon filter)
Demineralization by reverse osmosis (inorganic membrane)
Water values at the outlet of the water treatment system:
o
Water hardness
< 0.1 °dH
o
Conductivity
5-10 µS
o
Water temperature
6-25°C
(43-77 °F)
o
Flow pressure
2-3 bar
(43-58 psi)
The product has to be conducted in a closed system up to point where it exits the nozzle and it may not
get in contact with the air in the room any time
No water tanks with float control may be used. Closed membrane tanks made of stainless steel
or plastic have to be used for intermediate storage of the product (pressure control) instead
Fittings and tubes have to be made of materials authorized for the food industry (plastic, stainless
steel). Do not use copper or brass tubes!
The treated water has to be free from organic substances
WARNING!