Solid Fuel Loading Pump (Sfp) - Rotex Controller Series Product Documentation

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Solid Fuel Loading Pump (SFP)

NOTE: This function is only enabled, if a variable output is assigned to a solid fuel pump.
The following sensors can be used for this function:
•
•
•
If the solid fuel sensor is defective, the solid fuel loading pump is always ON.
Function: The solid fuel function enables the addition of a solid fuel boiler to the system in a
supporting role (usually in combination with a buffer tank) and to control it according
to the following different switching conditions.
Operation: Activation of the function and sensor assignment:
Minimum
temperature: Minimum temperature limit solid fuel boiler
If the temperature of the solid fuel boiler is 10 K higher than the low limit, the solid
fuel loading pump will be switched on.
If it falls below the low limit, it will be switched off.
Maximum
temperature: Maximum temperature limit solid fuel boiler
If the temperature of the solid fuel boiler is higher than the high limit, the solid fuel
loading pump will be forced to switch on. The excess heat will then be dissipated into
the selected (see menue buffer tank) circuits.
This forced operation will be finished and the temperature difference control enabled
when the solid fuel boiler temperature falls more than 10K below the high limit.
Switch-on
differential: Switch-on differential solid fuel boiler buffer tank (SD ON)
If the solid fuel boiler temperature increases above the buffertank plus adjusted
switch on temperature difference, the normal buffertank loading process can start
again.
SFS for the solid fuel boiler sensor
The connection is made according to the assignment to VI1 or VI2.
BU for the buffer sensor (optional)
The connection is made according to the assignment to a free variable input VI1
- VI3.
If no BU is connected, the value of the SPBU (own sensor input) is accepted as
a buffer sensor. In this way the SPBU input can be used as a sensor input for
several uncontrolled heat generators (e.g. solar or solid-fuel).
Note on operation
Activation solid fuel charging pump
Solid fuel boiler sensor is
permanently assigned to
corresponding VI
Optional buffer sensor (solid fuel)
Product documentation THETA NORM/UNIT
Key / parameter tree
HYDRAULIC
HYDRAULIC
Parameter
PARAMETER 08
or
PARAMETER 07
PARAMETER 08
or
PARAMETER 09
or
PARAMETER 10
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