Siemens AVS75.39 Series User Manual page 123

Frost protection
"Residual heat"
function
Residual heat function
duration max
Residual heat function
trigger
Speed control
Pump speed min /max
Siemens
Building Technologies
Line no. Operating line
4170 Frost prot plant boiler pump
The solid fuel boiler pump is activated depending on the current outside
temperature, even if there is no request for heat.
Soild fuel boiler frost protection only works if plant frost protection on line 6120 is
switched on.
Outside temperature
...-4 °C
-5...1.5°C
1.5 °C...
ON
-6 -5 -4 -3
4190 Residual heat fct dur max
4192 Residual heat fct trigg
Once ¦ Several times
Overrun of the boiler pump ensures that the boiler circuit's residual heat is
dissipated. This prevents an overtemperature and any shut down by the safety limit
thermostat.
The "Residual heat" function is aborted after the set maximum time at the latest.
The residual heat function may only be conducted once or several times, as
needed.
Once
When ended, the "Residual heat" function remains deactivated.
Several times
The "Residual heat" function is resumed when the switch-on criteria are fulfilled.
Line no. Operating line
4201 Pump speed min
4202 Pump speed max
The wood-fired boiler setpoint is used for speed control, which independent of the
partial diagram, is the parameterized integration and present heat request.
The setpoint for speed control is always at least 2 K above the pump switch-off
point.
Using these settings, minimum and maximum limitation of the pump speed is
provided.
User manual RVS43.345
The settings in detail
Pump
Continuously on
On for 10 minutes at 6-hour intervals
Continuously OFF
takt
-2 -1 0 1
Diagram
ON
takt (cycle)
OFF
OFF
2 3 4
TA °C
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