Landis & Staefa Division
CC1N7421E
December 04, 1998
9/16
LMG21... / LMG25...
LMG22...
A
Start command (switching on by «R»)
B-B´
Interval for establishment of flame
C
Operating position of burner reached
C-D
Burner operation
D
Controlled shutdown by «R»
•
Burner is immediately shut down
•
Burner control is immediately ready
for new startup
AL
Fault status signal (alarm)
M
Fan motor
BV...
Fuel valve
R
Control thermostat / pressurestat
EK2
Remote reset button
SA
Actuators
FS
Flame signal
SB
Safety limit thermostat
GP
Gas pressure monitor
W
Limit thermostat / pressure monitor
LP
Air pressure monitor
Z
Ignition transformer
LR
Load controller
•
Burner control is reset
•
All contacts in the line are closed
•
Fan motor «M» or AGK25 is connected
•
Air pressure monitor «LP» is in idle position
•
No undervoltage
Safety shutdown in the event
–
the mains voltage is lower than typically AC 160 V
–
a restart is made when the mains voltage exceeds AC 195 V
After no more than 24 hours of continuous operation, the burner control initiates a safety
shutdown, followed by a restart.
If the connections of line (terminal 12) and neutral (terminal 2) have been exchanged,
the burner control will initiate lockout at the end of «TSA».
•
If a fault occurs, all outputs will immediately be deactivated (< 1 s)
•
On restoration of power, a restart will be made with the full program sequence
•
If the operating voltage drops below the undervoltage threshold (for threshold, refer to
«Functions»), a restart will be made with the full program sequence
•
If there is a premature faulty flame signal during «t1»
⇒
Lockout
•
If the contact of the air pressure monitor «LP» has welded in the working position:
prevention of startup and, after 8.5 seconds, lockout
•
If the contact of the air pressure monitor «LP» has welded in the idle position: lockout
at the end of «t10»
•
If there is no air pressure on completion of «t10»
⇒
Lockout
•
If the burner does not ignite by the end of «TSA»
⇒
Lockout
•
If flame is lost during operation
⇒
LMG21... / LMG22...
lockout
⇒
LMG25...
three repetitions
When lockout occurs, the burner control can immediately be reset! In that case, keep
lockout reset button depressed for a minimum of 0.5 seconds and a maximum of 3
seconds!
Functions
S B / R / W / G P
A L
M
L P
B V 1
B V 2
Z
FS
tw
t1
t3 n
T S A
t4
7
4
21
d
0
5/
04
9
8
t1 0
E K 2
12
1 0
3
7
4
5
1 1
1
8
t3
A
B
B´
C
D
4 0 0 m s
S B / R / W / G P
A L
M
LP
S A
B V 1
(L R ) B V 2
Z
F S
tw
t1
t3 n
T S A
t4
7 42 1 d 0 6 /1 0 9 8
t1 0 + t1 1
t1 2
E K 2
1 2
1 0
3
7
4
5
1 1
1
8
A
B
B´
C
D
9
4 0 0 m s
t3
Legend
Prerequisites for startup
Undervoltage
Checked intermittent
operation
Reversed polarity
protection
Control program in the
event of fault
Resetting the LMG2...
