Siemens LMS14 User Manual

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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.18.9 Discharging protection
Line no. Operating line
5040 Discharging protection
Off
Always
Automatically
This function ensures that the DHW charging pump (Q3) is activated only when the
heat source temperature is high enough.
 Application with sensor:
The charging pump is activated only when the heat source temperature lies at a
level half the charging boost above the DHW temperature. When, during the
charging process, the boiler temperature drops to a level below the DHW
temperature plus 1/8 the charging boost, the charging pump is deactivated again. If
2 DHW sensors are parameterized for DHW charging, the lower temperature is
considered for the Discharging protection function (usually sensor B31).
 Application with thermostat:
The charging pump is activated only when the boiler temperature lies above the
Nominal DHW setpoint. When, during the charging process, the boiler temperature
drops to a level below the Nominal DHW temperature setpoint minus the DHW
switching differential, the charging pump is deactivated again.
Off
Function is deactivated.
Always
Function is always active.
Automatically
The function is active only if the heat source is not able to supply heat or if it is not
available (fault, heat generation lock).
After charging
When the DHW setpoint is reached, pump overrun starts. If the boiler temperature or
the common flow temperature falls below the DHW storage tank temperature during the
pump overrun time, pump overrun is ended. If 2 DHW sensors are used, the higher
sensor value is taken into consideration.
Discharging protection

Siemens LMS14 Specifications

General

Brand	Siemens
Model	LMS14
Category	Control Unit
Language	English