Siemens LMS14 User Manual

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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
6.7.5 Priority
Line no. Operating line
1630 Charging priority
Absolute
Shifting
None
MC shifting, PC absolute
When both space heating and DHW heating call for heat, the DHW priority function
ensures that while DHW charging is in progress, the boiler’s capacity is used primarily
for DHW heating.
Note!
On applications with diverting valves, the function is automatically deactivated.
Absolute
Mixing and pump heating circuits stay locked until DHW heating is completed.
Shifting
If the capacity of the heat source is not sufficient, the mixing and pump heating circuits
will be restricted until the DHW is heated up.
None
DHW heating and space heating take place at the same time. In the case of tightly
sized boilers and mixing heating circuits, the DHW setpoint may not be reached if
space heating calls for considerable amounts of heat.
MC shifting, PC absolute
The pump heating circuits stay locked until the DHW storage tank is heated up. If the
capacity of the heat source is not sufficient, the mixing heating circuits will be restricted
also.
6.7.6 Locking signals
Locking signals are used by the heat source to reduce or prevent heat consumption by
the consumers.
If the locking signal exceeds 50%, the DHW charging pump is deactivated. It will be
activated again when the locking signal drops below the threshold value of 50%.
Also, the heat source can calculate a critical locking signal based on a parameterized
maintained boiler return temperature. The impact on the DHW charging pump is the
same as with locking signal Boiler protection.
6.7.7 Forced signals
If required, the heat source can send forced signals to its consumers. When the heat
source delivers a valid forced signal, the DHW setpoint is set to the Legionella setpoint
and – if the DHW temperature is lower – the charging pump is activated. When the
forced signal becomes invalid, the charging pump is deactivated again and the DHW
setpoint will be reset to the normal setpoint.
Charging priority

Siemens LMS14 Specifications

General

Brand	Siemens
Model	LMS14
Category	Control Unit
Language	English