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SwiDiff Tret>Tflow
Numbr err, Tr>Tf 24h
TempBoilerMaxSLTSec
TempRetMaxSLTSec
SLT supervisory
functions (return
temperature > flow
temperature) and
temperature gradient
Building Technologies Division
Line no.
Operating line
[3923.1]
SwiDiff Tret>Tflow
Switch-off threshold for the difference of return temperature minus flow temperature
(temperature limitation).
Line no.
Operating line
[3924.1]
Numbr err, Tr>Tf 24h
Counter limit for triggering lockout in the event of error resulting from return temperature
above flow temperature.
Line no.
Operating line
[3639.1]
TempBoilerMaxSLTSec
Triggering value for temperature limitation through boiler flow.
Line no.
Operating line
[3925.1]
TempRetMaxSLTSec
Triggering value for temperature limitation via boiler return.
In certain situations, supervision of the temperature gradient and checking the
plausibility of flow and return temperature (return temperature > flow temperature) can
be deactivated for a certain period of time.
Assuming that – at first – no request for heat is active, the Don't care transition is
started when there is a request for DHW or space heating to be active for the
parameterized period of time. During the time the Don't care transition is active, the
SLT supervisory functions (plausibility flow/return and temperature gradient of flow) are
disabled. At the end of the Don't care transition, the supervisory functions are enabled
for at least 3 times the Don't care transition time. During this period of time, any request
for heat from the controller (DHW or space heating) can trigger the supervisory
functions and lead to safety shutdown or even lockout of the LMS14...
The Don't care transition can be reactivated only when the sum of the elapsed time
represents 4 times the Don't care transition time.
The supervisory functions are active only when the burner is in operation.
The Don't care transition is used both for checking the plausibility of flow and return
temperature and for monitoring the temperature gradient. With the latter, the Don't care
transition can be separately deactivated and its time of action is separately adjustable.
User Manual LMS14...
6 The settings in detail
253/617
CC1U7471en
28.01.2015
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