Miele CVA 615 - Manual (Page 12)

Determining the water
hardness
The hardness of the water (tap or
bottled) used in the coffee system must
be determined and programmed into
the appliance. The water hardness will
determine how frequently the unit must
be descaled to maintain the coffee
system properly. The machine monitors
the volume of water passing through it
in conjunction with the hardness of the
water and will indicate when descaling
is necessary. Your local water authority
can tell you the hardness of your tap
water or you can measure the hardness
yourself using the enclosed test strip.
^ Dip the strip in your drinking water for
one second, then shake off excess
water.
The result will be evident after a minute.
If the water hardness is greater than
40 gr/gal (700 ppm), the water
must
be mixed in equal parts with
non-carbonated mineral water to
prevent excessive limescale
build-up.
Never use distilled water.
Program
setting Water
Hardness
gr/gal ppm
Hardness 1 1 (soft) 0 - 3 0 - 130
Hardness 2 1 (soft) 4 - 7 130 - 250
Hardness 3 2 (medium) 7 - 14 250 - 380
Hardness 4 3 (hard)
4 (very hard)
14 - 21
over 21
over 380
Programming
12