Siemens AVS75.39 Series User Manual page 135

Charging time
limitation
Charging time limitation
Protection against
discharging
Discharging protection
Application with sensor
Application with
thermostat
Siemens
Building Technologies
Line no. Operating line
5030 Charging time limitation
During DHW charging, space heating may obtain no or too little energy, depending
on the selected charging priority (line 1630) and the type of hydraulic circuit. For
this reason, it is often practical to set a time limit for DHW charging.
- - -
Charging time limitation is deactivated. The DHW is heated up to the nominal
setpoint, even if space heating cannot draw sufficient heat for a certain period of
time.
10...600
DHW charging is stopped after the set period of time in minutes and then locked for
the same time before it is resumed. During this period of time, the heat produced
by the boiler is made available for space heating. This cycle repeats itself until the
nominal DHW setpoint is reached.
When space heating is switched off (summer operation, Eco function, etc.), DHW
charging will not be stopped, independent of the selected setting.
Line no. Operating line
5040 Discharging protection
Off ¦ Always ¦ Automatically
This function ensures that the DHW charging pump (Q3) is activated only when the
temperature of the generator is sufficiently high.
The charging pump is only activated when the temperature of the heat source lies
by half the charging boost above the DHW temperature. If, during charging, the
boiler temperature drops to a level below the DHW temperature plus 1/8 the
charging boost, the charging pump will be deactivated again. If 2 DHW sensors are
parameterized for DHW charging, the lower temperature is used for the discharging
protection function (usually sensor B31).
The charging pump will be activated only when the boiler temperature lies above
the nominal DHW setpoint. If, during charging, the boiler temperature drops below
the nominal DHW temperature minus the DHW switching differential, the charging
pump will be deactivated again.
Off
The function is deactivated.
Always
The function is always active.
Automatically
The function is active only if the generator is not able to deliver heat, or is not
available (fault, heat generation lock).
User manual RVS43.345
The settings in detail
135 / 239
CE1U2354en_021
2013-09-02