Siemens Albatros Zone Controler CE1U2353en01a - Manual (Page 20)

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Siemens Schweiz AG User Manual OEM CE1U2353en01a
HVAC Products The settings in detail 22. November 2006
When DHW heating is released for the first time in a 24-hour period, forced charging
will be initiated. DHW charging is also started when the DHW temperature lies within
the switching differential, provided it does not lie less than 1 K below the setpoint.
Charging time limitation
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 (operating line 1630) and the type of hydraulic circuit. For
this reason, it is often practical to set a time limit to DHW charging.
- - -
Charging time limitation is deactivated. The DHW is heated up to the nominal setpoint,
even if space heating temporarily obtains too little heat.
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 is repeated 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.
Discharging protection
Line no. Operating line
5040 Discharging protection
This function ensures that the DHW charging pump (Q3) will be activated only when the
boiler temperature is sufficiently high.
• With sensor
The charging pump will be activated only when the boiler temperature reaches the
level of the DHW temperature plus half the charging boost. 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).
• With thermostat
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
Function is deactivated.
Always
The function is always active.
Automatic
The function is active only if the heat source is unable to deliver heat, or is not available
(fault, heat generation lock).
Charging time limitation
Discharging protection