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7.4
Solid Fuel Boilers
In some layout plans (chapter 4) an after- function for solid fuel boilers
(-SFH) is already integrated. If the layout plan you selected does not
provide this function it can be programmed with the help of three
thermostat functions (chapter 5.1). To do this you also need two
available inputs and an available output (called Tx, Ty and Rx in the
adjacent diagram).
It is also possible to "upgrade" an after-heating system (-AH) contained
in the layout plan to a after-heating system for solid fuel boilers (-SFH)
with the help of two thermostat functions (chapter 5.1). To do this you
then need only one available input (called Ty in the adjacent diagram).
Function: If the storage tank temperature (Tx) falls below a specific value, the control system
automatically checks if the solid fuel boiler has reached the set minimum temperature on the boiler
sensor (Ty). Only when this is the case will the circulating pump (Rx) be switched on. When the
"switch-off temperature" is reached on the storage tank sensor (Tx) the circulating pump is switched
off again. During the after-heating process the control system also continuously checks the
temperature of the solid fuel boiler. If the boiler exceeds its set Max or Min limit, the circulating pump
will also switch off.
Implementation: Open the menu item 'Settings' -> 'Service' -> 'Functions' -> 'thermostats' and activate
three or, to upgrade a preset"-AH", only two available thermostats (
--2sec OK-->
:
). Then under
Settings enter the desired switch-on and switch-off temperatures and also the terminal positions of the
temperature sensors (Tx and Ty) and the circulating pump.
Example:
for storage tank monitoring thermostat1:
switch-on temp. 45°C ; switch-off temp. 55°C
temp.
input:
E6 (regulator) ; output: R4 (regulator)
(this first point does not apply when upgrading a
preset "-AH")
for boiler control (Min limit) thermostat2: switch-on
temp.
50°C ; switch-off temp. 48°C
temp.
input:
E7 (regulator) ; output: R4 (regulator)
for boiler control (Max limit) thermostat3: switch-on
temp.
88°C ; switch-off temp. 90°C
temp.
input:
E7 (regulator) ; output: R4 (regulator)
Since three functions (or two functions with "NH" layout plan) now access the circulating pump, a
logical link of these functions is required (see chapter 6).
Under 'Settings -> 'Service' -> 'Link' the output used for the circulating pump (R4 (regulator) in the
above example) must now be programmed as follows:
R4 (regulator) 'on' , if:
Therm os tat 1 'on'
and
Therm os tat 2 'on' and
Therm os tat 3 'on'
R4 (regulator) 'on' , if:
Sys tem control 'on'
and
Therm os tat 1 'on' and
Therm os tat 2 'on'
without contained "AH":
upgrade a contained "AH":
