Siemens AVS75.39 Series User Manual page 111

Switching diff off
Locking time
Control sensor
Type of heat source
Siemens
Building Technologies
If the common flow temperature exceeds the flow temperature setpoint by the
amount of the switch-off differential, switching off takes place immediately,
independent of the switching integral of the supplementary source (K32), and the
request for heat (K27) is aborted on completion of the overrun time.
The function requires a control sensor (common flow sensor B10 or buffer storage
tank sensor B4).
The locking time enables the internal controller heat source to reach a stable
operating state before the supplementary source is allowed to switch on.
The supplementary source is released only when the locking time has elapsed.
The locking time starts as soon as a valid flow temperature setpoint is available.
Calculation of the release integral starts only when the locking time has elapsed.
TVwSch
TVxSch
t
A
K27
TVxSch Actual value of common flow temperature
TVwSch Setpoint of common flow temperature
A Request
K27 Release output K27
No consideration is given to the locking time, if the controller internal heat source
malfunctions or is locked, or if the supplementary source must end DHW charging.
Setting "- - -" can be used to deactivate the function.
The supplementary source is controlled based on measured temperature on the
defined sensor here (common flow temperature B10 or buffer storage tank
temperature B4).
Line no. Operating line
3750 Source type
Other ¦ Solid fuel boiler ¦ Heat pump ¦ Oil/gas boiler
Defines the type of producer of the supplementary source.
Hence, operating units supporting this function can display the type of
supplementary source currently in operation.
User manual RVS43.345
The settings in detail
111 / 239
CE1U2354en_021
2013-09-02