EbV Product documentation THETA NORM/UNIT
8-48
* only if hot water loading is not active
** H-GEN is not available if
• an external heat generator disable is connected to a VI
• inhibition H-GEN by parameterisation in solid fuel menu tree is active
• inhibition H-GEN by parameterisation in solar menu tree is active
• no H-GEN is in the system
Table 1: Correlations between operating mode and buffer functions
Loading control
The supply of energy from a controlled heat generator to the heating circuits is
realized through loading the buffer tank. The buffer control ensures that the buffer
is supplied with sufficient energy from the heat generator, via the buffer loading
pump.
Discharge control 1
The heating circuits are supplied with energy either from the buffer through
discharging the buffer tank via BULP, provided the buffer tank contains sufficient
energy, or through direct supply from the heat generator.
Discharge control 2
The heating circuits are always supplied with energy from the heat generator. As
long as the buffer contains sufficient energy, the heat generator will be heated via the
buffer loading pump instead of the burner. If the energy in the buffer is not sufficient,
the burner will be started.
Set temperature: Buffer set temperature
The buffer set temperature is the temperature which the buffer tank must supply for
the connected heating circuits. This is the temperature of the highest demand in the
heating system.
Example:
• Demand value MC-1 = 45 °C
• Demand value MC-2 = 55 °C
• Demand value DHW = 65 °C
=> Buffer set temperature = 65 °C
A required excess value (e.g. hot-water load temperature excess) has already been
taken into consideration in the demand value of the heating circuits.
Minimum
temperature limit: Buffer minimum temperature limit
If there is a heat demand from heating circuits or DHW then the buffer tank
temperature is maintained on this adjustable limit. If the temperature drops below this
limit, the buffer tank is loaded again by the heat generator.
Operation buffer parameters:
Note on operation Key / parameter tree Parameter
Buffer operating mode BUFFER PARAMETER 10
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