Siemens LME39 Series - Functions and Operation; Burner Startup Preconditions; Undervoltage and Intermittent Operation; Fault Control Sequence

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Building Technologies CC1N7106en
HVAC Products 20.02.2008
Functions
• Burner control must be reset
• All contacts in the line are closed, request for heat
• No undervoltage
• Air pressure switch «LP» or CPI must be in its no-load position, or DBR2 is connected
• Fuel valve «BV1» is connected
• Fan motor or AGK25 is connected
• Flame detector is darkened and there is no extraneous light
• Safety shutdown from the operating position takes place should mains voltage drop
below about AC 85 V (at U
N = AC 120 V)
• Restart is initiated when mains voltage exceeds about AC 90 V (at U
N = AC 120 V)
• Safety shutdown from the operating position takes place should mains voltage drop
below about AC 175 V (at U
N = AC 230 V)
• Restart is initiated when mains voltage exceeds about AC 185 V (at U
N = AC 230 V)
After no more than 24 hours of continuous operation, the burner control initiates automatic
controlled shutdown followed by a restart.
If the connections of live conductor (terminal 12) and neutral conductor (terminal 2) are
mixed up, the burner control initiates lockout at the end of «TSA».
If lockout occurs, the outputs for the fuel valves, the burner motor and the ignition equip-
ment are immediately deactivated (<1 second).
Cause Response
Mains failure
Restart
Voltage below undervoltage threshold
Safety shutdown
Voltage above undervoltage threshold
Restart
Extraneous light during «t1» Lockout
Extraneous light during «tw» Prevention of startup, lockout after 30 sec-
onds at the latest
No flame at the end of «TSA» Factory setting:
Lockout at the end of «TSA»
Can be parameterized:
Max. 3 repetitions, followed by lockout at the
end of «TSA»
Loss of flame during operation Factory setting:
Lockout
Can be parameterized:
• Establishment of flame at the end of
«TSA»
→ Max. 3 repetitions
• No establishment of flame at the end of
«TSA»
→ Lockout
«LP» welded in working position Prevention of startup, lockout after max. 65
seconds at the latest
«LP» welded in normal position Lockout on completion of «t10»
No air pressure signal after completion «t10» Lockout
«CPI» contact is open during «tw» Prevention of startup, lockout after 60 sec-
onds at the latest
In the event of lockout, the LME39… remains locked and the red signal lamp (LED) lights up.
The burner control can immediately be reset. This state is also maintained in the case of
mains failure.
Preconditions for
burner startup
Undervoltage
Controlled intermittent
operation
Reversed polarity
protection with
ionization
Control sequence in the
event of fault