production is next needed, the water is thus warmer than ambient temperature and consequently
production will start faster.
Index Parameter Description
Eb02 Enable preheating
Enable preheat
Set the water temperature to maintain
Set water temperature offset
Default:
Preheating disabled
Water temp. set point in the boiler = 70°C (176°F)
Offset = 3% rH (3°C/5.4°F)
Set point range: 50-80°C (122-194°F)
Offset range: 2-20%rH (0-20°C/32-68°F)
The water temperature in the boiler is read by the passive NTC temperature probe in contact with the
boiler. The operating principle of the preheat function is described in the following graphs, the first for
control with probes, the second for control by external signal.
Preheat with autonomous modulating control with probes
The preheating function, if active, overlaps the control diagram and modulates the power delivered to
the heaters in relation to the water temperature and the preheating set point.
Fig.7.j
Key
Steam_pr Steam production
Pmax Max production
Pmin Min production
St Set point
%rH Humidity measurement
hy Activation hysteresis
BP Proportional band
Tab.7.b
Preheat with control by external signal
The preheating function, if active, shifts the control diagram by a value equal to the “offset”. The preheat
function modulates the power delivered to the heaters in relation to the water temperature and the
preheating set point.
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