The Landis control box starts the fan and begins the pre-purging of the combustion chamber. The air pressure switch
controls the correct operation. At the end of the pre-purging phase, the ignition transformer cuts-in followed by the
opening of the gas valves. In case of missed ignition or accidental shutdown, the ionisation probe cuts-in and set the
burner in lockout mode within the safety time.
Gas pressure switch
Motor
Air pressure switch
Transformer
Gas valve
High flame ON/OFF
Flame detection
ock out lamp
CALCULATION OF WORKING OUTPUT OF THE BURNER
To calculate the burner's working output, in kW, proceed as follows:
- Check at the meter the quantity of supplied litres and the duration,
in seconds, of the reading, then calculate the burner's output through
the following formula:
1 - PUMP
2 - SAFETY OIL VALVE
3 - LOW FLAME OIL VALVE
4 - HIGH FLAME OIL VALVE
5 - LOW FLAME NOZZLE
6 - HIGH FLAME NOZZLE
7 - GAS PRESSURE SWITCH
8 - SAFETY GAS VALVE
9 - LOW FLAME GAS VALVE
10 - HIGH FLAME GAS VALVE
CONTROL BOXES LANDIS & STAEFA LGB21/LGB22
t2
t3
t1
t5
t6
GAS CIRCUIT
SUCTION
RETURN
SUCTION
RETURN
t4
Description
t1 pressure switch control time-out
t2 time-out for air pressure confirmation
t3 prewashing time
t4 safety time
t5 preignition time
t6 time-out to enable fuel 2nd valve
e x f = kW
s
VgS
1
2
1° STADIO GAS
VGS
8
7
VgS
1
2
2° STADIO GAS
VGS
8
7
13
420010350301 Multicalor 45 ÷ 140
9"
3"
30"
3"
3"
8"
e =
Litres of gas
s =
Time in seconds
G20 = 34,02
G25 = 29,25
f
G30 = 116
G31 = 88
Vg1
5
3
Vg2
4
VG1
6
10
VG2
9
Vg1
5
3
Vg2
4
VG1
6
10
VG2
9
EN