342/617
Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.20.2 Stratification storage tank with control to the DHW
charging temperature via setpoint compensation
Control to the charging temperature allows the entire content of 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. In addition, setpoint compensation for DHW charging is to
be activated via parameter Flow setp compensation delay (5142), which means that the
parameter is not allowed to be OSV (---).
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.
If the pump in the primary circuit (boiler pump (Q1) or DHW charging pump (Q3)) is
configured as a modulating pump, the speed of that pump is modulated in a way that
the temperature maintained at sensor B36 is the charging setpoint. The pump’s speed
is increased as long as the temperature acquired by sensor B36 lies below the charging
setpoint; otherwise, the pump’s speed is reduced.
If the DHW intermediate circuit pump (Q33) is configured as a modulating pump, the
speed of that pump is modulated in a way that the temperature maintained at sensor
B36 is the charging setpoint. The speed of the intermediate circuit pump is reduced
until the temperature acquired by sensor B36 lies below the charging setpoint;
otherwise, the pump’s speed is increased.
The speed of the pump is modulated between the parameterized minimum Pump
speed min (5101) and the parameterized maximum Pump speed max (5102). The
pump’s speed is controlled via the controller coefficient for the DHW pump (Speed Xp
(5103), Speed Tn (5104), and Speed Tv (5105)).
The DHW intermediate circuit pump (Q33) can be activated with a delay in relation to
the pump in the primary circuit. The delay depends on the rate of boiler temperature
increase. For this, Min start temp diff Q33 (5148) can be used to set a temperature
differential. The intermediate circuit pump 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 switched
on 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.
To Next Page
Loading...
Need help?
General
