Siemens AVS75.39 Series User Manual page 128

Stratification/dischargi
ng protection
128 / 239
Siemens
Building Technologies
Line no. Operating line
4739 Stratification protection
Off ¦ Always ¦ With solid fuel boiler
4740 Strat prot temp diff max
4743 Strat prot anticipation time
4744 Strat protection Tn
4746 DHW prot combi st tank
Off ¦ On
4749 Min charging setpoint solar
The buffer storage tank's "Stratification protection" function provides for hydraulic
balancing between consumers and producer without the need for additional shutoff
valves for the buffer storage tank.
When the function is active, the volume of water on the consumer side is adjusted
so that the addition of colder water from the buffer storage tank is avoided
whenever possible.
The function is active only if at least one of the heat sources delivers heat.
Off
The "Stratification protection" function is deactivated.
Always
The "Stratification protection" function is active when the heat source is in
operation.
With solid fuel boiler
Stratification protection is active when the solid fuel boiler is on.
The function requires a common flow sensor B10.
If the temperature acquired by the common flow sensor (B10 downstream from the
buffer storage tank) drops below the heat source temperature by more than the
parameterized temperature differential, the volume of water on the consumer side
is reduced via locking signals (reduction in the setpoints). If the locking signal
reaches 100% for more than 10 minutes, the locking signal is deleted and
recalculated after one minute. This ensures that the volume of water on the
consumer side is not throttled altogether in which case there would be no flow
passing sensor B10.
Note: If a primary controller is configured downstream from the buffer storage tank,
and if there is no B10 connected, the function is calculated with the connected B15.
User manual RVS43.345
The settings in detail
CE1U2354en_021
2013-09-02