Pellas X S.Control, Operation And Installation Manual, Page: 11 / 48

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The controller determines the burner power
to be used by the boiler depending on the
preset boiler temperature and the pre-
defined hysteresis values
H2 hysteresis and
H1 hysteresis , Pic. 7.
It is possible to configure H1 and H2 values
so that the modulation will be done with no
intermediate level, i.e. by changing the level
from 100% directly to 30% and skipping the
50% power value (right part of the
illustration).
H1 hysteresis and H2 hysteresis are available
in:
Boiler settings
→
Power modulation
Pic. 7 Hystereses H1 and H2 of power modulation
Operation in Fuzzy Logic mode
In Fuzzy Logic mode the controller
automatically regulates burner power to
allow boiler operation in such a way to
maintain its temperature on preset level. The
controller uses power levels defined in
Standard mode. In this mode the parameters
Hysteresis H2 and Hysteresis H1 do not have
to be set.
The Fuzzy Logic mode unlike the Standard
mode is not faulty in respect of failing to
reach the preset boiler temperature due to
incorrect adjustment of
Hysteresis H2 and
Hysteresis H. It also allows for quicker reach
the preset temperature.
Attention: If the boiler operates
without heat buffer and controller is
switched into SUMMER mode than
Standard mode operation of the
controller is recommended.
After exceeding the preset temperature by 5
degrees C the controller switches into
SUPERVISION mode.
8.6 SUPERVISION
SUPERVISION mode is applicable either in
regulation in STANDARD and Fuzzy Logic
mode.
The controller switches into SUPERVISION
mode
automatically without user’s
intervention: - in Standard regulation mode
-
after reaching the boiler preset
temperature, - in Fuzzy Logic steering – after
exceeding boiler preset temperature by 5
degrees C.
In SUPERVISION mode the controller
oversees the furnace, keeping it from
burning off. To do so, the burner operates
with very low power, what together with
properly adjusted parameters do not cause
further increase in temperature. Burner’s
power in SUPERVISION mode and other
parameters of Supervision are grouped in
menu:
Service settings
→
Burner settings
→
Supervision
Maximum time of boiler’s operating in
supervision mode is defined in parameter
Supervision time . If after this time (in
Supervision mode) there is no need to
restart the boiler then the controller starts
the process of boiler’s burning off.
For setting Supervision time = 0
the controller omits SUPERVISION
mode and goes directly to BURNING
OFF.
8.7 BURNING OFF
The maximum boiler operation time in the
supervision mode can be defined in the
Supervision time parameter. If after that
time, counted from the moment the
controller entered the supervision mode, the
boiler operation is no longer necessary, the
boiler deactivation process is started.