EWS ES 2070 SV, Instruction Manual, Page: 8 / 44

ES2070 SV Changing and indication of program values 5
Changing and indication
of program values.
The most important program values can be recalled and, changed if required, by pressing a key.
Hardness of the water supply.
Press the "Hardness" key, indicated by the symbol , to display the supply water hardness.
Should it be necessary to change the programmed value; the arrow key "
8
" may be used to move the
flashing cursor to the digit to be changed, and the Number key "#" to make the change.
A desired unit of hardness measurement may be selected (section 7 of the programming instructions),
the following are available :-
Hardness units Programmable range
°D
°F
°E
mg/l CaCO
3
gpg
German hardness degrees
French hardness degrees
English hardness degrees
Milligrams per litre as CaCO
3
Grains per gallon
2 - 99
4 - 199
2 - 99
40 - 1990
2 - 99
The controller automatically recalculates the capacity between regeneration’s using the new value, at the
initiation of the next regeneration cycle, as follows :-
Important Note! If a hard water blending by pass is used so that the water meter indicates the blended
water capacity, it is essential to subtract the final, blended, water hardness from the value to be inserted.
Example:
supply water hardness = 300 mg/l CaCO
3
, blended water hardness = 120 mg/l CaCO
3
Thus a value of 180 mg/l CaCO
3
(300 mg/l CaCO
3
- 120 mg/l CaCO
3
) must be programmed into the
control.
Water hardness:
220mg/l
Column capacity [ mg/l CaCO
3
/m
3
of resin x m
3
of resin]
=Softened Water Capacity [m
3
]
Supply Water Hardness [mg/l ~ CaCO
3
]