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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.21.7 Speed-controlled pump
Pump Q34 of the instantaneous water heater can be a speed-controlled pump.
When DHW is consumed, speed control of Q34 is ensured by a PID controller. The
speed of this pump is calculated such that the water temperature reached at sensor
B38 represents the setpoint at the tap. If the temperature acquired by B38 exceeds the
setpoint required at the tap, the speed is reduced, otherwise it is increased.
The controller coefficients are ready set. The neutral zone is ±0.4 K.
In Keep hot operation, the speed of the instantaneous water heater pump is maintained
at the parameterized minimum level.
The resulting speed is delivered according to the configuration made at PWM output P1
(Function output P1 (6085)).
In the case of hydraulic systems with diverting valve and speed-controlled boiler pump,
the speed calculated for the instantaneous water heater pump can be used for
controlling the boiler pump. For that, modulation mode Demand must be selected for
the boiler pump (refer to Pump modulation (2320)) and PWM output P1 (Function
output P1 (6085)) must be configured for use with the boiler pump.
Also, in that case, the speed limitations for the instantaneous water heater pump are
used for the control of the boiler pump.
Line no. Operating line
5530 Pump speed min
Minimum speed limit for the pump of the instantaneous water heater (heating expert).
Line no. Operating line
5531 Pump speed max
Maximum speed for the instantaneous water heater pump (heating expert).
Line no. Operating line
5535 Pump speed min OEM
Lower speed limit for the pump of the instantaneous water heater (OEM).
Line no. Operating line
5536 Pump speed max OEM
Upper speed limit for the pump of the instantaneous water heater (OEM).
Line no. Operating line
5537 Starting speed
Speed of pump of the instantaneous water heater for the start kick.
Pump speed min
Pump speed max
Pump speed min OEM
Pump speed max OEM
Starting speed
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