Nortec Air Humidification System BS - Manual (Page 17)

25.05.05-A page 17 of 30
NOTE:
If the water hardness is higher then 20°dH (German hardness) it is recommended to use a water
softener. Please contact the Nortec sales man if you have questions.
4.3.2 Requirements regarding water treatment
The operator shall ensure that the following requirements are met on a permanent basis.
- A three-stage water treatment system has to be used
- Water softening (<0.1 °dH at the outlet)
- Filtering (mechanical filter 5u + activated-carbon filter)
- Demineralisation by reverse osmosis (inorganic membrane)
- Water values at the outlet of the water treatment system
Î Water hardness < 0.1 °dH
Î Conductivity 5-10 µS
Î Water temperature 6-25 °C (43-77°F)
Î Flow pressure 2-3 bar (43-58psi)
- 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 authorised for the food industry (plastic, stainless
steel). Do not use copper or brass tubes!
- The treated water has to be free from organic substances.
4.4 Notes on compressed air supply
The operator shall ensure that the following requirements are met on a permanent basis.
- The compressed air must have respiratory air quality and be free from contamination
(residual oil content < 0.003 mg/m
3 , dust, water, etc.).
- The admissible inlet pressure on the wall brackets is max. 6 bar (without pressure
fluctuations and pressure blows).
- When dimensioning the compressor and/or the outlet pressure, possible losses via the tube
network have to be taken into consideration.
- It is recommended to install a micro filter and an activated carbon filter.
- When an manometer and a pressure-relief device are installed in the compressed air feed, the
performance of the system can be assessed more easily.
- Important! The compressed air line has to be blown out before it is connected.