pag.20
B
LB 381
BLU 500 -1400 PR / MD
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 pres-
sure port E, until reaching 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
SHIFTING FROM NAT. GAS TO L.P.G.: Remove the front disk from the firing head
SHIFTING FROM L.P.G. TO NAT. GAS: Fit the front disk to the firing head
POSITIONING THE DISK FOR NATURAL GAS AND L.P.G.
13 mm.
1200
13 mm.
1400
1200
1400
Open
Closesd
NATURAL GAS
L.P.G.
Per trasformare il bruciatore da metano a G.P.L. eseguire le seguenti opera-
zioni (come indicato in figura):
-
Eseguire filettatura M6 su tre fori Ø 5.
-
Tappare i tre fori filettati con viti M6.
M6
TRASFORMAZIONE DA METANO A G.P.L. BLU 500
