Franke FCS4050 - Page 36

6 | Installation Franke Kaffeemaschinen AG
36 User manual SB1200 FM CM
Water temperature <25 °C
Connection to the mains water connection G3/8" compression fitting and metal hose l=1500 mm
Only connect with the hose kit provided
– The mains water connection must meet the requirements of the technical data and comply with applicable fed-
eral, state, and local regulations.
– The mains water connection must have a backflow prevention device.
– The mains water connection must be equipped with a shut-off valve and a check valve with an upstream filter
accessible for inspection. It must be possible for the filter to be removed for cleaning.
– Water from the household decalcification system must not be used.
– Filter with at least 100 loops/inch (UL)
6.3.2 Water quality
Total hardness: 4–8° dH GH (German total hardness)
7–14° fH GH (French total hardness)
4.2–8.3GPG
70–140ppm(mg/l)
Carbonate hardness 3–6°dHKH / 50–105ppm (mg/l)
Acid content/pH value 6.5–7.5pH
Chlorine content < 0.5mg/l
Chloride content < 30mg/l
TDS (total dissolved solids) 30–150ppm(mg/l)
Electrical conductivity (measured) 50–200µS/cm (microsiemens)
Iron content < 0.3mg/l
– Color: Clear
– Taste: Fresh and pure taste
– Aroma: No perceptible aroma
– No rust particles in the water
– Reverse osmosis: The water must have a dissolved solids content of at least 30-50 ppm (30-50 mg/l) in order
to prevent the boiler being overfilled.
Evaluating the risk of corrosion
The following formula can be used for evaluation:
Calculated conductivity = measured conductivity [μS/cm] – (measured total hardness [dH GH] x constant)
– Measured conductivity in μS/cm
– Measured total hardness in dH GH
– Constant = 30 [μS/cm]/[ dH GH]
Calculated conductivity Risk of corrosion
<200 μS/cm low
200 – 500 μS/cm increased
>500μS/cm high
Calculation example:
– Measured conductivity 700 μS/cm
– Measured total hardness 18 dH GH