EN - 18
Dismantling the fan
Shim the housing, unbolt and remove the front wall, then remove the cone.
Remove the screw from the end of the shaft in order to remove the turbine. If necessary, use a hub puller.
Separate the housing from the seat and remove the bearing caps.
Loosen the bearings and remove the shaft. Unbolt the bearing base and separate it from the stand.
2. WATER TREATMENT
Water hardness
Water that is hard is excessively charged with calcium ions and magnesium ions.
Water’s calcium or magnesium salt content determines its hardness level.
In this document, hardness is expressed as French degrees (°f).
Each degree refers to a concentration of 4 mg/litre of calcium and of 2.43 mg/litre of magnesium, or 10 g of calcium carbonate (CaCO3) per m
3
.
Example:
The evaporation of 1 m
3
of water of 30°f hardness will cause the formation of a deposit of 30 x 10 = 300 g of calcium carbonate.
IMPORTANT
Water hardness (°f) should not be confused with the acidity or alkalinity of water, which is expressed as pH (hydrogen potential) and varies from 0 to 14.
Water pH
pH is the measure of water’s alkalinity or acidity.
Water with a pH < 7 is acidic (its alkalinity is reduced) and therefore corrosive.
Water with a pH of 7 is neutral.
Water with a pH
PH
0
14
Water pH
Acidic water
Neutral water
Alkaline water
CORROSION
SCALING
Water hardness
Water hardness<7°
Water hardness<15°
Water hardness<30°
Water hardness>30°
Water hardness
Generally SOFT WATER
HARD WATER
SCALE-FORMING HARD
WATER
VERY HARD WATER
