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Info/diagnostics
Additional parameters
348/617
Building Technologies Division
6.20.3 Stratification storage tank with direct control to the DHW
charging temperature
This variant is activated by switching the setpoint compensation off. For this, parameter
Flow setp compensation delay (5142) is used to set the delay for setpoint
compensation to OSV (---).
Control to the charging temperature allows the storage tank to be charged to the
required DHW setpoint.
This type of control requires a sensor B36 to be configured and connected to one of the
multifunctional sensor inputs.
Full charging with B36 (5146) can be used to define whether full charging shall be
ended when the DHW charging temperature rises. Otherwise, full charging is ended via
sensor B31 at the bottom.
The pump in the primary circuit (boiler pump (Q1) or DHW charging pump (Q3)) can be
a PWM pump. During full charging, this pump is constantly controlled with the
parameterized Pump speed min (5101), during recharging, with the parameterized
Pump speed max (5102).
Note!
If the DHW intermediate circuit pump (Q33) is configured as a modulating pump, it is
always controlled with the parameterized minimum speed, regardless of the type of
charging.
The DHW intermediate circuit pump (Q33) can be activated with a delay in relation to
the pump in the primary circuit. The delay is dependent on the rate of boiler
temperature increase. For this, Min start temp diff Q33 (5148) can be used to set a
temperature differential. The DHW intermediate circuit pump (Q33) is activated when
the boiler temperature reaches the level of current DHW setpoint minus the value set
here (in the case of a negative value), or when the boiler temperature exceeds the
current DHW setpoint by the value set here (in the case of a positive value).
ON
Boiler temp (8310) > DHW temp setpoint (8831) + Min start temp diff Q33 (5148)
If, subsequently, the boiler temperature drops below this limit, the intermediate circuit
pump still remains activated.
The temperature differential can be parameterized in the range from -20 °C to +20 °C. If
the temperature differential is set to OSV (---), the intermediate circuit pump is activated
with no delay in relation to the pump in the primary circuit.
When the Legionella function is active, the parameterized Legionella funct setpoint
(1645) is used as the DHW setpoint.
Line no.
Operating line
Boiler temp
8310
DHW temp setpoint
8831
Line no.
Operating line
Legionella funct setpoint
1645
Pump speed min
5101
Pump speed max
5102
Flow setp compensation delay
5142
Full charging with B36
5146
Min start temp diff Q33
5148
User Manual LMS14...
6 The settings in detail
CC1U7471en
28.01.2015
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