Tabla de contenido
Idiomas disponibles
Idiomas disponibles
B LB 472 Blu 1700.1÷2000.1 P AB
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
pressure (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
DJUSTMENT OF THE AIR PRESSURE SWITCH
Unscrew screws A and B and remove cover C.- Set the pressure switch to the minimum by
turning 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 increase
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; coun-
terclockwise to increase. At the end tighten the locking nut.
The minimum current necessary to operate the control-box is 3 µA (Landis LGB22), 1,5 µA (Satronic DMG972).
When the measurement of the current is required it is necessary to disconnect the lead to the probe and insert in its
place a microammeter for direct current (see fig. under).
POSITION OF ELECTRODES
IONIZATION CURRENT
SATRONIC DMG 972
min. 1,5 µA
1
50 µA
8 mm
1,5 mm
Elettrodo di rivelazione
Ionization probe
pag.14
2,5 mm
" "
Elettrodo di accensione
Ignition electrode
M
I
L
C
A
B
1
min. 3 µA
LANDIS LGB 22
Microamperometro
fondo scala 50 µA
N
D
H
G
E
F
Tabla de contenido
