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7
7.7 Solid fuel boiler functions
The solar controller has three different solid fuel boiler
functions.
1. Solid fuel boiler minimum temperature
To release solid fuel boiler operation, this
temperature must be exceeded. The limit value
SolidF. temp. minimum
is allocated with a
switch hysteresis of -5K.
Example:
SolidF.temp. minimum
= 30°C
Released at 30°C; disabled at 25°C
2. Solid fuel boiler function without thermal
return flow increase via controller
The release of the boiler circuit pump PFK occurs when
the temperature differential between the solid fuel
boiler sensor ( TFK ) and the calorifier sensor
( TPU ) is greater than the
SolidF. diff. On
set.
The boiler circuit pump PFK is switched off, when the
temperature differential between the solid fuel boiler
sensor ( TFK ) and the calorifier sensor ( TPU ) is less
than the
SoldF. diff. Off
set. The speed control
attempts to maintain a minimum load temperature. The
setpoint is made up to the formula on the right.
Formula:
Minimum load temperature =
TPU +
1
/
2
x (
Diff. On
+
Diff. Off
)
3. Solid fuel boiler function with thermal
return flow increase via controller
The boiler circuit pump PFK be be released due to the
temperature increase rate at the solid fuel boiler
sensor ( TFK ).
If the temperature increase is greater than the
SolidF temp. increase
set, the boiler circuit pump
(PFK) is switched on for a minimum of 10 minutes,
irrespective of the
SolidF. temp. minimum
and the
temperature differential between TPU and TFK.
The pump switches off, if the temperature
differential between TFK and TPU is less than the
SolidF diff. Off
.
The speed control attempts to maintain a minimum load
temperature.
The setpoint is made up to the following
formula.
Formula:
Minimum load temperature =
Calorifier temp. se
1
/
2
x (
Diff. On
+
Diff. Off
)