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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.20.3.2. Recharging the stratification storage tank
When recharging the stratification storage tank, only the upper section of the tank is
charged to the current DHW temperature setpoint.
Recharging is started when the temperature acquired by sensor B3 at the top lies
below the switch-on threshold:
ON
DHW temp 1 (8830) < DHW temp setpoint (8831) – Switching diff (5024)
During recharging, the burner’s output is controlled to the temperature acquired by
sensor B36. The charging setpoint is calculated from the DHW setpoint plus the
parameterized Interm circ boost recharging (5139):
Temperature charging setpoint = DHW temp setpoint (8831) + Interm circ boost recharging
(5139)
During recharging, the pump in the primary circuit (boiler pump (Q1) or DHW charging
pump (Q3)) is constantly controlled with the parameterized Pump speed max (5102).
Recharging is ended when the temperature acquired by sensor B3 at the top exceeds
the DHW setpoint:
OFF
DHW temp 1 (8830) > DHW temp setpoint (8831)
If, during charging, the temperature at sensor B36 (DHW charging temp (8836))
exceeds the charging setpoint by the current Switching diff off min DHW
(2461)/Switching diff off max DHW (2462), the burner is switched off. It is switched on
again as soon as the temperature at sensor B36 drops by the parameterized Switching
diff on DHW (2460) below the charging temperature setpoint.
The setting range for the switch-on differential starts at 0 °C.
The output request to the burner is controlled between the parameterized Required
speed LF min (9525) and the maximum output for DHW mode, Fan speed DHW max
(2444). If no maximum output for DHW mode is parameterized (OSV), the maximum
burner output, Required speed HF max (9530), is available for recharging.
If, during the time recharging is active, the enable criterion for full charging is met, the
DHW request is ended according to the criteria for full charging.
Line no. Operating line
8830
DHW temp 1
8831
DHW temp setpoint
8836
DHW charging temp
Line no. Operating line
2444
Fan speed DHW max
2460
Switching diff on DHW
2461
Switching diff off min DHW
2462
Switching diff off max DHW
5024
Switching diff
5102
Pump speed max
5139
Interm circ boost recharging
9525
Required speed LF min
9530
Required speed HF max
Info/diagnostics
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