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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.19 Storage tank systems
6.19.1 Control of storage tank with sensor
For storage tank control with sensor, at least one sensor is required: Sensor B3 at the
top of the tank. Optionally, temperature sensor B31 at the bottom can be used. If Full
charging is selected as the Type of charging (5022), the sensor at the bottom is also
used for starting or ending the storage tank charging process. If only sensor B3 at the
top is installed and Full charging is selected as the Type of charging (5022), the unit
behaves as if Recharging was selected as the Type of charging (5022).
Legionella function active:
When the Legionella function is active, the parameterized Legionella funct setpoint
(1645) is used as the DHW temperature setpoint.
Triggering a DHW request:
In the case of recharging, storage tank charging is triggered when the temperature
acquired by the sensor at the top lies by at least the parameterized Switching diff
(5024) below the DHW temperature setpoint.
ON
DHW temp 1 (8830) < DHW temp setpoint (8831) – Switching diff (5024)
In the case of full charging, storage tank charging is triggered when the temperature
acquired by both sensors lies by at least the parameterized Switching diff (5024) below
the DHW temperature setpoint.
ON
DHW temp 1 (8830) < DHW temp setpoint (8831) – Switching diff (5024)
and
DHW temp 2 (8832) < DHW temp setpoint (8831) – Switching diff (5024)
Ending a DHW request:
In the case of recharging, storage tank charging is ended when the temperature
acquired by the sensor at the top reaches the current DHW setpoint.
OFF
DHW temp 1 (8830) > DHW temp setpoint (8831)
In the case of full charging, storage tank charging is ended when the temperature
acquired by both sensors reaches the current DHW setpoint.
OFF
DHW temp 1 (8830) > DHW temp setpoint (8831)
and
DHW temp 2 (8832) > DHW temp setpoint (8831)
The burner is switched on when the boiler temperature lies by at least the
parameterized Switching diff on DHW (2460) below the Boiler setpoint (8311). It is
switched off when the boiler temperature lies by at least the parameterized Switching
diff off min DHW (2461)/Switching diff off max DHW (2462) above the Boiler setpoint
(8311).
The output request to the burner is controlled between Required speed LF (9524) and
Required speed HF (9529).
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