Siemens AVS75.39 Series User Manual page 127

Generation lock inactive
Generation lock active
Frost protection for the
buffer storage tank
In heating mode
In cooling mode
Siemens
Building Technologies
The source lick is deactivated as soon as the selected buffer storage tank
sensor(s) is below the demanded flow temperature setpoint by the "Temp'diff
buffer/HC" plus "Relative T'diff buffer/HC".
The heat sources are released.
The source lick is activated as soon as the selected buffer storage tank sensor(s) is
below the demanded flow temperature setpoint by less than the "Temp'diff
buffer/HC" plus "Relative T'diff buffer/HC" minus "Auto lock source SD".
The heat sources are locked.
With B4B4 (line 4720)
4722
4728
4721 OEM
1
E
0
4721 Auto heat gen lock OEM
4722 Temp diff buffer/HC
4728 Relative T'diff buffer/HC
B4 Buffer or combi storage tank sensor at the top
B41 Buffer or combi storage tank sensor at the bottom
TVLw Flow temperature setpoint
E Generation lock (1 = active, 0 = inactive)
Frost protection for the buffer storage tank acts differently in heating and cooling
mode.
If the temperature at the coldest buffer storage tank sensor drops below 5 °C, the
frost protection function generates a temperature request to the heat sources and
puts the electric immersion heater – if present – into operation, until the storage
tank temperature has returned to a level above 10 °C.
If, in cooling mode, one of the 2 storage tank temperatures (B4 or B41) drops
below 5 °C, the cooling sources are switched off. They will be released again when
the temperature at both sensors exceeds 6 °C and the locking time of 15 minutes
has elapsed.
User manual RVS43.345
The settings in detail
With B4 and B41 / B42 (line 4720)
4722
B4
4728
4721 OEM
1
E
0
B4
B41
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CE1U2354en_021
2013-09-02