Water Hardness - Miele DGC 7840 HC Pro Operating And Installation Instructions

Water hardness

To ensure that the steam combination oven works correctly and to ensure that
descaling is carried out at the correct interval, it must be set to the local water
hardness level. The harder the water is, the more frequently the steam combination
oven needs to be descaled. Contact your local water supplier to find out your local
water hardness range if necessary.
If you are using an on-site water softener, match the setting on the steam
combination oven to the value set on the water softener.
If you are using an on-site system to fully demineralise the water (e.g. a reverse
osmosis system), the system must be set so the conductivity of the treated water
is at least 100 μS/cm. In the case of most water qualities, this can be achieved by
setting a water hardness of at least 0.54 mmol/l (3 °dH) rather than fully
demineralising the water. The conductivity is required for the fill level detection in
the steam generator. Match the setting on the steam combination oven to the value
set on the full demineralisation system.
If you are using bottled water, it must comply with the relevant national
regulations for drinking water quality. Do not use mineral water or carbonated
water. Adjust the setting on the steam combination oven depending on the
calcium content. The calcium content is specified on the label of the bottle in
2+
mg/l Ca or ppm (mg/l CaCO
Water hardness
°dH °fH
1 1.8
2 3.6
3 5.4
4 7.1
5 8.9
6 10.7
7 12.5
8 14.3
9 16.0
10 17.9
11 19.6
12 21.4
13 23.2
14 25.0
).
3
Calcium content
mg/l Ca
mmol/l
0.18
0.36 14
0.54 21
0.72 29
0.90 36
1.07 43
1.25 50
1.43 57
1.61 64
1.79 71
1.97 79
2.15 86
2.33 93
2.51 100
Calcium
2+ carbonate
content
ppm (mg/l CaCO
7 18
36
54
71
89
107
125
143
161
179
196
214
232
250
Settings
Setting on steam
combination oven
)
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
47