7.4.4 Maximum number of evaporation cycles between drain to
dilute cycles settable by the user (Installer menu)
The “Evaporation cycles before drain” parameter is used to manually set the maximum number of
evaporation cycles allowed between two drain to dilute cycles. The number of evaporation cycles
between two successive drain to dilute cycles can also be calculated internally, based on feedwater
conductivity. To use the automatic formula, set “Evaporation cycles before drain” = “Auto”. The number of
evaporation cycles used by the controller will be the lower of the value set manually by the user and
calculated automatically.
Index Parameter Description
Ec11
Number of evaporation
cycles before drain
Set the number of evaporation cycles between two drain to dilute
cycles.
Default: number of cycles: Auto;
Possible settings: Auto (automatic management according to
feedwater conductivity); 1 to 40
7.4.5 Duration of the fill and drain to dilute cycles settable by the
user (Installer menu)
On screen Ec12, the duration of the fill time after the evaporation cycle and the duration of the drain to
dilute cycle can be set in relation to the default parameter values.
Index Parameter Description
Ec12
Variation in fill and
drain time
Set the fill after evaporation and drain to dilute times in relation to the
default values
Default:
variation in fill time: 100%
variation in drain time: 100%
Possible settings:
variation in fill time: 20-100%
variation in drain time: 0-190%
The duration of the drain to dilute cycle is set using the “variation in drain time” parameter, which
defines the time as a% of the default value:
new drain time = (default drain time × variation in drain time)/100
Example: if the default time is 10 s and “variation in drain time” = 50%, then the new time will be = 10 s
x 50/100 = 5 s.
The same also applies to the fill time after the evaporation cycle, in this case using the “variation in fill
time” parameter:
new fill time = (default fill time × variation in fill time)/100
Note: if the drain to dilute time is very short, there may be the RISK OF FOAM/CORROSION due to
increased internal conductivity. Low values should be set for the “variation in drain time” parameter
only after having carefully evaluated the water quality and the consequences.
Warning: RISK OF FOAM FORMING WHEN “variation in drain time” IS TOO LOW FOR THE WATER
QUALITY.
“variation in drain time” = 100 % means that the default value will be used.
“variation in drain time”< 100 % means that the drain time will be less than the default, consequently
introducing less fresh water when next refilling, reducing the negative impact on steam production
(important in high-precision applications).
Setting the “variation in drain time” for precise %RH control: the “variation in drain time” must be set as
low as possible, without however causing formation of foam/corrosion. Proceed by trial and error so as to
find the most suitable value.
Note: the duration of the water fill cycle can be used to offset water pressure upstream of the
humidifier. Decrease the fill time in the case of high pressure and vice-versa. Nonetheless, feedwater
pressure must be within the range of pressure values specified in “General characteristics and models”
(1-8 bars)
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