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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Room-compensated
The speed of the heating circuit pump is calculated based on the heat request from the
room controller. The greater the demand for heat, the higher the pump speed. The
lowest pump speed is limited by the parameterized minimum, the highest by the
parameterized maximum.
If the heat request drops below the parameterized heating limit for the room controller
(Heating limit room controller (761)), the pump will be deactivated on completion of the
parameterized overrun time.
(Example heating circuit 1)
Line no. Operating line
761 Heating limit room controller
882 Pump speed min
883 Pump speed max
885 Pump speed min OEM
886 Pump speed max OEM
Temp differential nominal
When this option is selected, the speed of the heating circuit pump is adjusted to the
set nominal increase (Temp differential nominal (2317)).
The pump speed is modulated so that a temperature differential equal to the set
nominal increase is established in the boiler.
If the current temperature differential in the boiler is greater than this, the pump speed
is increased.
If it is not, the pump speed is reduced.
The pump speed for the heating circuit pump is controlled by a PID controller.
This involves using the controller coefficients that have been set for the boiler pump
(Speed Xp (2324), Speed Tn (2325), Speed Tv (2326)).
The pump speed limit is based on the minimum and maximum speeds set for the
heating circuit pump.
If this modulation mode is set for multiple heating circuit pumps, the modulation of all
these pumps is synchronized within the set minimum and maximum speeds.
When DHW operation is active, the heating circuit pump is controlled using the set
minimum speed.
When the floor curing function is active, the heating circuit pump is controlled using the
set maximum speed.
Note!
If this function is used, limitation of the boiler temperature differential must be
deactivated (Temp differential max (2316) = OSV).
Note!
This modulation mode is not suitable for cascade applications.
Line no. Operating line
2324
Speed Xp
2325
Speed Tn
2326
Speed Tv
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