77
ENG
User menu and unit confi guration
g0300122EN rel. 1.0 - 01.12.2021
12.5.5
D
uration of the fi ll and drain to dilute cycles settable by the user (Installer menu)
On screen Ec12, the duration of the fi ll 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 fi ll and
drain time
Set the fi ll after evaporation and drain to dilute times in relation to the default values
Default:
variation in fi ll time: 100%
variation in drain time: 100%
Possible settings:
variation in fi ll time: 20-100%
variation in drain time: 0-190%
Tab. 12.ad
The duration of the drain to dilute cycle is set using the “variation in drain time” parameter, which defi nes 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 fi ll time after the evaporation cycle, in this case using the “variation in fi ll time” parameter:
new fi ll time = (default fi ll time × variation in fi ll time)/100
IMPORTANT:
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.
IMPORTANT:
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 refi lling, 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 fi nd the most suitable value.
Notice:
the duration of the water fi ll cycle can be used to off set water pressure upstream of the humidifi er. Decrease the
fi ll time in the case of high pressure and vice-versa. Nonetheless, feedwater pressure must be within the range of pressure values
specifi ed in “General characteristics and models” (1-8 bars)
12.5.6
S
et feedwater hardness (Installer menu)
To read feedwater hardness, an analysis kit is available (P/N: KITTH00000). The “Water hardness” parameter defi nes the mainte-
nance alarm for cleaning the boiler and the heat exchanger.
Index
Parameter
Description
Ec13
Water hardness
Set the feedwater hardness
Possible settings:
Hardness: Auto, Manual
Manual setting: demineralised, 0-10°f, 10-20°f, 20-30°f, 30-40°f.
Remarks: if the value is set to Auto, the water hardness is estimated by the controller based on the con-
ductivity value.
Tab. 12.ae
If water hardness is not set, the controller independently manages the type of water based on the conductivity reading. Al-
though there is no reliable relationship between water hardness and conductivity, a hardness of 40°f is typically equivalent to a
conductivity of approximately 900-1000 μS/cm at 20°C. See “Boiler operating hours” for information on the maintenance alarm
times in relation to water hardness or conductivity.