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APPENDIX: COMPONENTS CHARACTERISTICS 26
LANDIS LMG21/22/25 FLAME CONTROLLER
FEATURES
The series of equipment LMG.. is interchangeable with the series
LGB.., all diagrams and accessories are interchangeable, the main
features are:
Protection against overvoltage:
with voltages lower than160V ~ (with input 230V ~) the equipment
stops, when the voltage overcome 195V ~ (with input 230V ~) the
equipment starts again and repeats the starting cycle;
Indications of error codes by a signalling red light in the release
button;
Programmer times fix for the digital management of signals.
In case of lack of the flame during working the model LMG 25.33
doesn’t stop but repeat the starting cycle
maximum 3 times), if the problem persists, after the fourth starting
the equipment stops .
Comparative table
Conditions for startup
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
Undervoltage
Safety shutdown in the event the mains voltage is lower than typi-
cally AC 160V;
a restart is made when the mains voltage exceeds AC 195V
Reversed polarity protection
If the connections of line (terminal 12) and neutral (terminal 2) have
been exchanged, the burner control will initiatelockout at the end of
"TSA"
Operations key
BV Fuel valve
FS Flame presence signal
GP Gas detection pressure switch
LP Air pressure switch
LR Burner's output regulation
M Fan motor
R Safety thermostat or pressure switch
SB Safety limit
W Regulation thermostat or pressure switch
Z Ignition transformer
tw Waiting time
t1 Pre-ventilation time
TSA Ignition safety time
t3 Pre-ignition time
t3n Ignition time during “TSA”
t4 Interval BV-BV2 or BV1-LR
t10 Specified time for air pressure signal
t11 Programmed opening time for actuator SA
t12 Programmed closing time for actuator SA
Startup program
A Start-up, controlled by LR
-fan command after the waiting time tw for LMG21/25, or after the
period t11 for LMG22.
tw Waiting time.
During this time the air pressure switch and the flame relay are tested
for correct contact position.
t1 Pre-purgue time.
Purguing of the combustion chamber and the secondary heating sur-
faces with low-load combustion head for LMG21/25, or with fully load
combustion air for LMG22. The affective pre-purgue time comprises
the interval between the end of tw and the start of t3.
TSA Ignition safety time.
Opening of fuel valve BV1; the flame signal must be present at the
terminal 1 up tho the end of TSA.
t3 Pre-ignition time.
Ignition time until the opening of BV1.
t3n Ignition time during "TSA".
Interval between the start of TSA and the shut-off of ignition transfor-
mer Z. The transformer is shut-off 400ms before the end of TSA.
t4 Interval BV-BV2 or BV1-LR.
Interval between the end of TSA and the consent to the second fuel
valve BV2 or to the load regulator LR.
t10 Specified time for the air pressure signal.
When this time has elapsed, the set value of air pressure must have
built up, else a lock-out is initiated.
t11 Programmed time for the opening of the servocontrol SA,
only with LMG22. The servocontrol SA moves to the low flame posi-
tion.
B-B’ Interval for the flame establishment.
C Operating position of the burner.
C-D Burner operation (heat production)
D Controlled shut-down by LR.
The burner is shut-off immediately and the flame control device is
ready for a new start.
FUNCTIONS
LMG21.../LMG25...
LMG22...
Old series LGB New series LMG
--- LMG 25.33
LGB 21.33 LMG 21.33
LGB 22.33 LMG 22.33