The control box starts the burner
fan, to carry out the prepurging of
the combustion chamber, and
cheks the vent air pressure through
the air pressure switch. At the end
of prepurging, the ignition tran-
sformer cuts-in and generates a
spark between the electrodes. At
the same time the two gas valves
open (Vs safety valve and Vl working valve). The total safety, in case of missed ignition or casual burner's flame-out,
is granted 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.
LANDIS & STAEFA, Model LFL1.622 OPERATING CYCLE
+
–
C
AIR EXCESS (%)
AIR FACTOR
THERMAL POWER (kW)
10
10
20
30
40 50 60
70
80
90
100
200
300 400
500
600
700
800
900
1000
1,1
1,15
1,2
1,2
1,2
1,25
1,3
15
20
25
30
2000
3000
5000
4000
6000
Natural Gas
CO
2
9,6%
CO
<100 ppm
Ref. Description
t1
Duration Waiting time for confirmation
t2
of air pressure
t3
Preventilation time
t4
Safety time
t5
Pressurizing time
Time for enabling operation of the
main gas valve on minimum capacity
t6
Time for enabling operation of the
main gas valve on maximum capacity
Duration
8”
66”
2”
4”
10”
10”
Rivelazione
di fiamma
Spia di blocco
Valvola gas
Serranda aria
Serranda gas
Trasformatore
di accensione
Pressostato aria
Motore ventilatore
Pressostato gas
0
min
100%
t1
t2
t4
t3
t6
t5
Ciclo di funzionamento normale
Ciclo di funzionamento
in mancanza di fiamma all'accensione
t1
t2
t4
t3
Consenso
min./max. potenza
Gas manostat
Fan motor
Air Switch
Ignition transformer
Gas valve
Min/max capacity
enabling device
Air damper
Gas damper
Flame detector
Cut-out pilot lamp
Normal operating cycle
Operating cycle in the event of
ignition failureNormal operating cycle
ADJUSTING THE PRESSURE REGULATOR
The pressure regulator, complete with its incorporated filter, must be installed to avoid contaminants
reaching the gas valve. It is important to ensure certain conditions: The pressure of the gas must not
exceed the established maximum pressure. To increase the pressure of the gas supply, tighten screw
C; to reduce the pressure, loosen screw C. After making any adjustments, put the cap back in place.
CALCULATING THE BURNER CAPACITY
To calculate the burner's capacity in kW, proceed as follows: Check the gas flow rate (in liters)
on the counter and the time of the reading in seconds.
Proceed with the calculation using the following formula: x f = kW
e
sec
e
= Litres gas
sec = Time in second
G20 = 34,02
G30 = 116
G31 = 88
f
pag.4
techniques for energy saving
LB1203
MULTICALOR 300.1÷400.1
ADJUSTING THE COMBUSTION PROCESS
IMPORTANT:
to obtain the right adjustment of the combustion and thermal capacity it is important to analyze the reducts of
combustion with the aid of suitable instruments. The combustion and thermal capacity adjustment is done simultaneously,
together with the analysis of the products of combustion, making sure that the measured values are suitable and that they com-
ply with current safety standards. On this matter, please refer to the table and figure below.
THESE OPERATIONS MUST BE DONE BY PROFESSIONALLY-QUALIFIED TECHNICIANS.
NOTE:
ALL SAFETY DEVICES (AIR PRESSURE SWITCH, MINIMUM GAS PRESSURE SWITCH, GAS SOLENOID
VALVES AND GAS GOVERNOR) SHALL BE DULY SEALED AFTER CALIBRATION AND BURNER START UP BY
ECOFLAM’S TECHNICIANS.
case of no ignition the burner goes to lock-out within two seconds. Now the burner is operating at the min. firing rate (about
30% of the max. firing rate). The air servocontrol runs at the Low Flame position and in case the temperature control has to be
set at the max. output it goes to a fully open position of air damper and butterfly valve. During the burner-off periods the air
dumper closes up fully.
