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11.11 Reduced fills to restore water level after evaporation
When, during the steam production, the upper floater switches because the water level has decreased, a
fill starts for restoring the water level.
The duration of the fill can be decreased through the new user parameter bA which defines the new
duration as a % of the internally set default duration: new duration= default duration x bA / 100. Note
that, regardless the value entered into bA, the water level will be always restored up to the upper floater.
Parameter bA:
20 to 100 %
100 %
10 %
bA= 100 % means that the default duration will be used
bA< 100 % means that the duration is < default duration: a smaller amount
of fresh water is introduced into the cylinder, thus with a smaller impact on
the steam production (good for high precision applications); on the other side,
however, the fill valve will open more frequently
ENGLISH
Range
Default
Step
Remarks
11.12 PWM fills after dilution and high-level/foam drains
After a dilution or high-level/foam drain, water is filled into to restore the water level up to the upper
floater.
The filled fresh water disturbs the steam production because it decreases the average temperature of
the water inside the boiler: in order to reduce the negative influence of the fresh water on the steam
production, the user can enable the PWM fills after the dilution and high-level/foam drain.
PWM fills work as follows:
1. the mass of fresh water required to restore the water level is divided into smaller masses of fresh
water;
2. by keeping the partial fills as farther apart as possible from each other, each partial mass of fresh
water is given the maximum possible time for heating up before the next one arrives, thus reducing
the effect of the fresh water on the steam production.
The duration of each fill can be defined in seconds by the new user parameter bE:
Range
Default
Step
1…199 seconds
5 seconds
1 second
heaterSteam +030222011 - rel. 2.4 - 31.10.2012
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