Siemens LMS14 User Manual page 481

Boiler temp alarm
Key
Building Technologies Division
Line no. Operating line
6743 Boiler temp alarm
This function monitors the boiler temperature when the burner is in operation and – in
the event of fault – sets off an alarm.
When the burner is switched on, or when the boiler load increases while the burner is
running, the boiler temperature might continue to drop somewhat further. From this
lowest temperature level, the boiler temperature must increase by the minimum amount
of (y = 4 K) within the parameterized alarm time. Otherwise, a boiler alarm is triggered.
If no request for heat is active, or if the current setpoint is reached, no alarm is
delivered.
T
TKw
Not ok
Stat
ok
AT
1
BR
0
1
A
0
Figure 99: Error message functions – boiler temperature alarm
Line no. Meaning
8310 Current boiler temperature
A Alarm (0 = Off, 1 = On)
AT Alarm timer
BR Burner (0 = Off, 1 = On)
Stat State (not ok/ok)
T Temperature
t Time
tKA Time boiler alarm
TKw Boiler temperature setpoint
y Minimum increase after burner On
User Manual LMS14...
6 The settings in detail
BZ 8310
y
tKA
y
t
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CC1U7471en
28.01.2015