APPENDIX: COMPONENTS CHARACTERISTICS
23
LANDIS LGB 21/22.. FLAME CONTROLLER
Function
The programme run is shown in the diagrams. The required and per-
missible input signals for the control part and flame supervision part
are pictured as a hatching correspondingly in the function diagrams. If
these input signals are missing, the controller interrupts the start-up
programme and initiates a lock-out at the place where the safety
regulations demand it.
The LGB types are fitted with under voltage protection, i.e. the load
relay AR is de-energized when the supply voltage falls below 140 V.
The burner control automatically attempts a new start-up when the
supply voltage again exceeds 140 V
A
Start-up command from the temperature or pressure
controller “R”
A-C
Start-up programme
C-D
Burner operation (heat production corresponding to the control
commands)
D
Controlled shut-down by “R”
LGB21
LGB22
Key for operation diagram
A
Start-up (control start-up by “R”)
B-B'
Interval for flame establishment
C
Operating position of the burner or release of the 2nd stage via
load controller LR
D
Controlled shut-down by "R"
tw
Waiting time, 8 sec. for LGB21; 9 sec. for LGB22
t1
Controlled pre-purge time, 30 sec.
t2
First safety time, 3 sec.
t3
Pre-ignition time, 2 sec. for LGB21; 3 sec. for LGB22
t4
Interval BV1- BV2 = Interval BV1- LR, 8 sec.
t10
Specified time for the air pressure signal, 5 sec. for LGB21;
3 sec for LGB22
t11
Programmed time to open the damper SA, max 12 sec.
t12
Programmed running time for air damper from OPEN to
LOW FLAME position, max 11 sec.
BV
Fuel valves
FS
Flame presence signal
GP
Gas pressure switch
LP
Air pressure switch
LR
Load controller
M
Fan motor
R
Temperature or pressure controller
W
Safety thermostat or pressure switch
Z
Ignition transformer
ZV1
Main flame ignition gas valve or BV1 for burners with main
flame supervision
1...12 Terminals of the burner flame controls on AGK11's socket
Command signal from flame control
Input signals
Conditions for starting up the burner:
The burner control must not be locked out.
The contacts of the gas pressure switch ”GP", the temperature or
pressure switch “W" and the controller “R", must be closed.
Start-up programme
A
Start-up command (controlled start-up)
The regulator "R" supplies (due to terminal 12) the mechanism; the
fan starts up for pre-purge. The actuator SA moves the air damper to
the maximum load position (after the time t11).
tw
Waiting time
During this time the air pressure switch check for correctoperation.
t11
Running time for complete damper opening (OPEN)
(only for LGB22)
The fan motor is started only after the air damper has reached the full
load position.
t10
Specified time for the air pressure signal
When this time has elapsed, the set value of air pressure must have
built up, or a lock-out is initiated.
t1
Pre-purge time
For LGB21.. purging of the combustion chamber with the nominal air
load; for LGB22.. purging of the combustion chamber with the maxi-
mum air load. During this time, the pressure switch LP must give its
consent. The real time of pre-purgue is between the end of tw and the
start of t3.
t12 Programmed time to close the damper SA (MINIMUM)
During the time t12, the air damper moves to the low flame position.
t3 Pre-ignition time
During this time, and until to the end of the safety time t2, the flame
relay is forced to close. When time t3 has elapsed, the fuel release is
initiated at terminal 4.
t2 Safety time
At the end of safety time there must be a flame signal at the input 1 of
the flame signal amplifier, which must continues uninterruptedly until
controlled shut-down occurs, or the flame relay will deenergize, and
remains blocked in the fault position.
t4 Interval
When time t4 has elapsed, the controller starts.
B - B' Interval for flame establishment
C Burner operation position
C - D Burner operation (heat production)
Operation of the burner at the maximum strenght or, with a
flame controller for the load.
D Controlled by "R" shutdown
The burner stops, waiting for the next ignition.
Summary of Contents for S10
Page 18: ...PART III MAINTENANCE 18 ELECTRICAL DIAGRAMS Electrical diagram 01 320 Rev 3...
Page 19: ...PART III MAINTENANCE 19 Electrical diagram 01 427...
Page 20: ...PART III MAINTENANCE 20 SPARE PARTS...
Page 29: ...APPENDIX COMPONENTS CHARACTERISTICS 29...
Page 30: ...APPENDIX COMPONENTS CHARACTERISTICS 30...
Page 31: ...APPENDIX COMPONENTS CHARACTERISTICS 31...
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