Configuration parameter
[BufferFlex] function block
19
5.1.2.2
BufferFlex with oil or gas auxiliary
boiler
Settings for log boiler with PufferFlex and
additional oil and gas auxiliary boiler
If an oil or gas auxiliary boiler is installed, additional
parameters can be set.
Explanation of [Buffer off]
This sets the shutdown temperature for the buffer
charge through the boiler. If the temperature sensor in
the buffer has exceeded the shutdown temperature,
charging of the buffer by the boiler is stopped.
The value should be at least 5 - 10 °C above the
average return temperature of the consumers,
but no more than 70 °C. A high shutdown temperature
reduces the number of boiler starts and improves
boiler running time.
Explanation of the [Extra charge] function
With this function a daily point in time is defined
(=[Start time]) and an upper limit for the outdoor
temperature (=[Charging under outside temperature])
to additionally charge the buffer. This buffer charging is
done independently of the actual consumer require-
ments and independently of the set time windows.
A separate minimum temperature [Charge buffer min
extra] and shutdown temperature [Charge buffer from
extra] can be set for this charge. Charging ends as
soon as the buffer reaches these temperatures.
The function is turned on or off with the parameter
[Activate time programme?].
For an immediate start, the [Immediately charge]
parameter must be set to [On].
Explanation of [Desired charging time]
This parameter defines the time required by the boilers
to charge the buffer to the required target temperature
[Buffer target].
In cascade systems (several boilers charge one
buffer), adjusting this parameter may be helpful
for faster buffer charging. Shortening this time causes
other boilers to fire up sooner to help charge the buffer.
Lengthening the time would extend the running time of
an individual boiler.
Explanation of [Buffer off]
This sets the shutdown temperature for the buffer
charge when the consumer is in operation while
requesting heat from the buffer.
If the temperature sensor in the buffer has exceeded
the shutdown temperature, charging of the buffer ends
and the buffer is charged.
If several consumer levels are configured, a
different shutdown temperature can be set for
each level.
Settings
Buffer off
Buffer
Boiler/buffer producer
Starting after additional criteria
Extra charge
Activate time programme?
Start time
Immediately charge
Charge buffer min extra
Charge buffer from extra
Output regulation
Desired charging time
Consumers
a
a. Only visible with a single consumer level
Buffer off
Consumer levels
b
b. Only visible with multiple consumer levels
Consumer 1 (top)
(applies also to [Consumer 2] and
[Consumer 3])
Buffer off
