2
23
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2 Boiler operation
!
!
2.1 Firing up/Damping under control of the flue gas sensor
!
2.2 Limiting the flue gas temperature
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3 Hydraulic configurations of the controller.
3.1 Configuration without the mixing valve
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The text <xx> indicates the parameter “xx” whose detailed description is in ch. 9
The controller regulates the central heating system with the fine coal boiler, in which by
controlling the efficiency of the blower the boiler temperature is changed.
The fine coal CH boiler operates in the following cykle: firing-up - operation - damping:
he controller turns on the blower. It causes firing up the fine coal and
gradual increase in temperature of the boiler. Reaching <22> TempSTOP_BOILER = 35 C
finishes the firing-up phase. The duration of the firing-up phase is limited up to 2 hours. If the
temperature doesn
’
t increase the controller switches over to the damping phase.
The controller skips the firing-up phase and automatically turns on the boiler if after switching on
the power the water temperature is above <22>.
the controller maintains the boiler temperature at the preset value. If
the boiler temperature is below the preset one the blower switches on (the rotations of the blower
are selected automatically). The increase in temperature above the preset one causes the blower
switched off. In that state the scavenges of the boiler are carried out (acc. to the settings) in order
to get rid of the combustion gas.
The temperature drop below <22> TempSTOP_BOILER=
<23> TimeSTOP_BOILER=45min the temperature doesn
’
t increase then the
blower turns off an
The given temperatures relate to the situation when the sensor of the flue gas is inactive.
After connecting the flue gas sensor the transition between the operation phases depends on the
temperature of the flue gas.
Connecting the flue gas sensor opens up the following additional functions of the controller:
Fast detection of the fired-up and damped state
Enhancing the combustion efficiency by limiting the temperature of the flue gas.
The parameters <24>, <24d> and <25> determine the fired-up and damped conditions.
The controller detects the fired-up state if the flue gas temperature is above <24>+ <24d>
(50 C+30 C=80 C)
Setting <24>=500 C turns off that function. The transition between phases is controlled by the
water temperature (<22> , <23>).
The parameters <36> , <36d>and<37> determine the limit of the flue gas temperature.
If the
temperature exceeds <36>=250 C then the blower efficiency is reduced to the
value <37>=40% (if it
’
s higher)
Temperature drop below <36>-<36d> (250 C 20 C=230 C) calls back the normal operation.
<36>=500 C turns off that function. There
’
s no reduction of the blower efficiency
The following hydraulic diagrams show the possible operation configurations of the controller.
<60>(
„
ModeMIXER
”
)=OFF
Phase I/Firing - up - t
In the phase II/Operation -
o
o
o
o
o
o
o
o
o
o
35 C starts
. If for
d the operation cycle of the boiler is completed.
The controller detects the damped state if the flue gas temperature is below <24>=50 C and
that state remains active for the time <25>=10min
flue gas
o
o
the phase III/Damping of
the Boiler
?
?
?
?
?
?
Setting
For this configuration you set
Admission
date
Realization
date
Signature
Remarks
