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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Transfer sensors and temperature level
For heat transfer to start, the temperature acquired by sensor B4 at the top must lie by
at least the parameterized boost above the temperature acquired by sensor B3 or B31
in the DHW storage tank.
If the buffer storage tank temperature drops by more than 2 K below the demanded
boost, the transfer of heat is ended.
When there is a valid request for heat from the DHW storage tank, the heat source is
released if the buffer storage tank temperature falls below the transfer temperature
level currently required. To be able to switch a released heat source off again, the
buffer storage tank must lock the release via function Automatic heat generation lock.
This approach ensures that a heat source in operation can end DHW charging also
when the buffer storage tank temperature increases again due to DHW charging. This
means that the heat source is locked again only if the buffer storage tank is able to
satisfy the current request for heat.
If sensor B31 is intended for the transfer of heat, and sensor B31 is not available,
sensor B3 is automatically used. If, according to parameterization, sensor B3 shall be
used for the transfer of heat, but sensor B3 is faulty, there will be no more heat transfer.
No heat transfer takes place in applications where there is a thermostat inside the DHW
storage tank.
If no sensor B4 is connected, sensor B41 will be used, if available.
Line no. Operating line
5130 Transfer strategy
Heat transfer in connection with combi storage tanks
If a transfer pump Q11 is configured, the function is also performed when a combi
storage tank is used.
Without Q11, the heat sources receive no request during heat transfer and charging
pump Q3 is not activated. After a certain waiting time, the upper part of the storage tank
will automatically have assumed a higher temperature. If this waiting time is not
desired, the Transfer function can be deactivated.
Line no. Operating line
5021 Transfer boost
5131 Comparison temp transfer
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