Siemens LME7 Series Basic Documentation page 49

Key to phases
Building Technologies Division
Infrastructure & Cities Sector
Phase Function
number
LOC Lockout shutdown phase
OFF Standby, waiting for heat request
oP1/oP:P1 Operation of first stage
oP2/oP:P2 Operation of 2nd stage
10 Home run
21 Safety valve ON, air pressure switch in no-load position
Check if POC is closed
22 Part 1: Fan motor ON
Part 2: Specified time air pressure switch
Message (timeout), stabilization of air pressure switch
30 Part 1: Prepurge time without flame simulation test
Part 2: Prepurge time with flame simulation test (2.1 seconds)
38 Preignition time
40 Postignition time, parameter 257 + 0.3 seconds
42 Flame detection
44 Interval: End of ignition safety time and release of load controller
74 Postpurge time
90 Pressure switch-min open → safety shutdown
Basic Documentation LME7...
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CC1P7105en
29.11.2011