Siemens LMS14 User Manual page 365

Keep hot function after
consumption (time
limited)
Keep hot function
continuous operation
Building Technologies Division
After DHW consumption, activation of the heat exchanger's Keep hot function can be
parameterized for a certain period of time. Parameter Min cons time for keep hot (5468)
allows the Keep hot function to be activated only when the consumption time reaches
this minimum time period.
If, during the time the Keep hot function is active, there is a request for space heating,
the time the Keep hot function shall be active can be set between 0 and 30 minutes,
using parameter Keep hot time with heating (5471). If there is no request for space
heating, the period of time the Keep hot function shall be active can be set between 0
and 1,440 minutes using parameter Keep hot time wo heating (5470). If set to 1,440
minutes, continuous operation starts (see below).
If, during the time the Keep hot function is active, there is a request for space heating,
the function is stopped or aborted, if the parameterized time (space heating request
active (Keep hot time with heating) has already elapsed. If there is no more request
from space heating and the parameterized time (space heating request inactive (Keep
hot time wo heating) has not yet elapsed, the Keep hot function is resumed.
Another option to keep the heat exchanger at the required temperature level is
continuous operation. To ensure that the heat exchanger is brought to the Keep hot
setpoint not only after DHW consumption – to be kept at that level for a limited period of
time –, but always when the heat exchanger's temperature drops by one switching
differential below the Keep hot setpoint, the heat exchanger is recharged.
User Manual LMS14...
6 The settings in detail
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28.01.2015