Siemens LMS14 User Manual

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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.15.9 Recooling
It makes sense to use recooling together with overtemperature protection. If the DHW
storage tank has already reached the maximum storage tank temperature level, which
means that overtemperature protection for the collector is no longer possible, recooling
can again lower the storage tank’s temperature level (typically during the night).
Recooling of the storage tank can be accomplished via the collector’s surface or the
heat source and space heating.
Note!
Cooling mode is canceled if the DHW storage tank must be recooled during Cooling
mode.
The surplus energy held by the storage tank can be released to the environment by
circulating the water through the cold collector.
The collector pump is activated if the lower storage tank temperature at sensor
B31/B41 is at least 2 K above the recooling setpoint and higher than the collector
temperature by at least the parameterized charging switching differential.
(Storage tank temperature > recooling temperature +2 K and storage tank temperature
> collector temperature + switching difference).
The collector pump is switched off if the collector temperature comes within 2 K of the
storage tank temperature (collector temperature > storage tank temperature –2 K)
The function is ended if the recooling temperature within 1 K of the room temperature
setpoint for cooling (Storage tank temperature < recooling temperature +1 K)
The function can be deactivated. In addition, it is possible to select whether it should be
active throughout the year or only in the summer.
T
t
Q5
SDRü
B6
B3/B31
OFF
ON OFF
ON
TRKw
2 K
OFF
B4/B41
7471d25e/1214
Figure 62: Recooling – recooling via the collector's surfaces
Key
Line no. Meaning
B3/B31 DHW storage tank sensors
B4/B41 Buffer sensors
B6 Collector sensor
Q5 Collector pump (On/Off)
t Time
T Temperature
SdRü Switching differential for recooling
TRKW Recooling temperature
Recooling via the
collector’s surface

Siemens LMS14 Specifications

General

Brand	Siemens
Model	LMS14
Category	Control Unit
Language	English