EbV Product documentation THETA NORM/UNIT
8-50
Start-up protection: Buffer start-up protection (only with charging control)
In buffer operation there is no start-up protection for the heat generator acting on the
heating circuits. The start-up protection only acts on the buffer loading pump. When
buffer start-up protection is switched on and the buffer tank temperature drops below
the minimum temperature limit, all consumer circuits are separated hydraulically
(pumps are switched off). The buffer start-up protection is disabled (pumps are
switched on again) when the buffer tank temperature exceeds the buffer minimum
temperature plus half of he buffer switching differential. All consumer circuits remain
in operation when buffer start-up protection is switched off.
Discharge
protection: Buffer discharge protection (only charging control)
Buffer discharge protection disables the buffer loading pump until the heat generator
temperature has risen to more than 5 K above the buffer nominal temperature.
This measure prevents any rear buffer discharge through the heat generator. The
buffer loading pump is disabled again as soon as the temperature difference
between the heat generator and the buffer tank has dropped to less than 2 K.
Buffer sensor 2: Buffer sensor 2 (BU 2)
The buffer tank can be equipped with a second sensor (BU2) for unmixed storage
tank loading and discharge. Loading starts if the highest of both temperatures falls
below the setpoint. Loading is finished if the lowest of both temperatures exceeds the
setpoint plus buffer switching differential. [stratified discharge]
Operation buffer parameters:
Note on operation Key / parameter tree Parameter
Buffer sensor 2 (bottom) HYDRAULIC PARAMETER 08
or
PARAMETER 09
or
PARAMETER 10
Minimum temperature BUFFER PARAMETER 01
Maximum temperature BUFFER PARAMETER 02
Temperature excess H-GEN BUFFER PARAMETER 03
Switching differential BUFFER PARAMETER 04
Forced heat dissipation BUFFER PARAMETER 05
Drain function switch-on differential BUFFER PARAMETER 06
Drain function switch-off differential BUFFER PARAMETER 07
Start-up protection BUFFER PARAMETER 08
Discharge protection BUFFER PARAMETER 09
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