pag.20
B
LB 1377
MULTICALOR 170.1 -200.1 PR / MD
LANDIS LGB 22 UP-CYCLE
The control box starts the
burner fan, to carry out
the prepurging of the com-
bustion chamber, and
cheks the vent air pressure
through the air pressure
switch. At the end of pre-
purging, the ignition tran-
sformer cuts-in and gene-
rates a spark between the
electrodes. At the same
time the two gas valves open (Vs safety valve and Vl Low flame working valve).
The total safety, in case of missed ignition or casual burner's flame-out, is gran-
ted by a ionisation probe which cuts-in and sets the burner shutdown within
the safety time. In case of gas lack or a major pressure drop, the minimum air
pressure switch shuts down the burner.
t1
t2
t3
t2
t3
t5
t4
t6
t1
t5
t4
Lock out lamp
Flame detection
Gas valve
High flame ON/OFF
Transformer
Air pressure switch
Motor
Gas pressure switch
Normal operative cycle ignition
Operative cycle with flameless
Description
t1 pressure switch control time-out
9"
t2 time-out for air pressure confirmation 3"
t3 prewashing time
30"
t4 safety time
3"
t5 preignition time
3"
t6 time-out to enable fuel 2nd valve
8"
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:
CALCULATION OF WORKING OUTPUT OF THE BURNER
e x f = kW
s
e
=
Litres of gas
s
=
Time in seconds
G20 = 34,02
G25 = 29,25
G30 = 116
G31 = 88
f
ADJUSTMENT OF GAS MINIMUM PRESSURE SWITCH
Unscrew off and remove cover M. - Set regulator N to a value equal to 60% of gas nominal feed pres-
sure (i.e. for nat. gas nom. pressure = 20 mbar, set regulator to a value of 12 mbar; for L.P.G. nom.
pressure of G30/G31- 30/37 mbar, set regulator to a value of 18 mbar).Screw up cover M
ADJUSTMENT OF THE AIR PRESSURE SWITCH
Unscrew screws A and B and remove cover C.- Set the pressure switch to the minimum by tur-
ning regulator D to position 1.
- Start the burner and keep in low flame running, while checking that combustion is correct.
Through a small cardboard, progressively obstruct the air intake until to obtain a CO2 increa-
se of 0,5÷0,8% or else, if a pressure gauge is available, connected to pressure port E, until rea-
ching a pressure drop of 1 mbar (10 mm of W.G.). - Slowly increase the adjustment value of
the air pressure switch until to have the burner lockout. Remove the obstruction from the air
intake, screw on the cover C and start the burner by pressing the control box rearm button.
Note: The pressure measured at pressure port E must be within the limits of the pressure
switch working range. If not, loose the locking nut of screw F and gradually turn the same:
clockwise to reduce the pressure; counterclockwise to increase. At the end tighten the
locking nut.
2,5
5
10
15
50
25
35
30
40
45
20
0,4
0,6
0,9
3,0
1
,5
2,1
1,8
2,4
2,7
1,2
I
L
M
N
A
B
C
D
E
F
G
H
gas pressure
switch
air pressure switch
ASPIRAZIONE
RITORNO
VgS
Vg
VG
VGS
1
2
3
4
7
6
5
GAS CIRCUIT
1 -
PUMP
2 -
SAFETY OIL VALVE
3 -
OIL VALVE
4 -
NOZZLE
5 -
GAS PRESSURE SWITCH
6 -
SAFETY GAS VALVE
7 -
GAS VALVE
SUCTION
RETURN
