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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Speed control of DHW charging pump Q3
Storage tank with built-in heat exchanger
and sensor B36 in the return. The control
calculates the speed of the charging pump
such that the temperature at sensor B36 lies
2 K above the storage tank temperature at
sensor B3.
If the return temperature is higher, the speed
is increased, otherwise it is reduced.
Q3
B36
B3
B31
T
T
T
7471a42/0411
Storage tank with external heat exchanger
and sensor B36 in the flow (partial diagrams
22 and 23).
When setpoint compensation is active (Flow
setp compensation delay (5142) not OSV):
The control calculates the speed of the
charging pump such that the charging
temperature at sensor B36 exceeds the
DHW setpoint by the parameterized
Intermediate circuit boost (5140). If the
charging temperature is higher, the speed is
reduced.
When setpoint compensation is deactivated
(Flow setp compensation delay (5142)
OSV): In the case of full charging, the
charging pump is controlled to the
parameterized minimum speed, and in the
case of recharging to the parameterized
maximum speed.
7471a13/0109
B3
Q3
B31
B36
Q33
T
T
T
The control calculates the speed of the intermediate circuit pump such that the charging
temperature at sensor B36 exceeds the DHW setpoint by the parameterized
Intermediate circuit boost (5140). If the charging temperature is higher, the speed of the
intermediate circuit pump is increased. If no valid sensor B36 is connected, the pump is
controlled to the parameterized maximum speed.
Speed control
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