Cuenod C 280 B 517/8 Manual De Utilización página 36

Start up
Description and adjustment
MB-VEF gas valve
MB VEF valve
MB VEF valve...is a compact assembly
including the following :
A built-in or pocket filter, adjustable
pressure switch, non-adjustable
quick-acting safety valve, proportional
regulator-controlled main valve which
can be adjusted on opening (V and N).
It ensures a constant gas flow/air flow
ratio and is quick-acting.
The regulator also takes into account
combustion chamber pF pressure or
atmospheric pressure.
The valve is delivered preset according
to table here below.
Burner C 280 B 517/8
Gas P VEF 412
V
G20 300
N
V
G25 300
N
V
G31 148
N
Burner C 285 B 517/8
Gas P VEF 412
V
G20 150
N
V
G20 300
N
V
G25 300
N
Burner C 330 B 517/8
Gas P VEF 412
V
G20 150
N
V
G20 300
N
V
G25 300
N
Burners C 380-430 B 517/8
Gas P VEF 412
V
G20 300
N
V
G25 300
N
36
420
3
0
3
0
3
0
420
3
0
3
0
3
0
420
3
V
0
3
0
3
0
420
3
0
3
0
11/2003 - Art. Nr. 13 013 506A
1 Pressure switch electrical
connection (DIN 43650)
2 Solenoid electrical connection
(DIN 43650)
3 Pressure switch
4 Intake flange
5 Pressure take-off G 1/8 before
possible filter on either side
6 Filter under the cover
7 Identification plate
8 Air pressure pL G 1/8
connection
9 V ratio adjusting screw
10 Pressure take-off pe G 1/8 both
sides
11 Gas pressure take-off pBr
M4 (V2)
12 Adjusting screw for correction of
zero point N
13 Connection G 1/8 for
combustion chamber
pressure pF
14 Connection G 1/8 for gas
pressure pBr
15 Outlet flange
16 Pressure pa take-off after V1
both side
17 On indicator V1, V2 (optional)
18 pBr - pL - pF pressure take-off
tubes
Air pressure switch setting
· Remove the transparent cover.
The unit includes a x index and a
movable graduated disk.
· Provisionally set the pressure switch
at the minimum value shown on the
graduated disk.
Regulator setting
All settings are carried out with the
burner working:
· Use 2,5mm hex key to turn the
N
screws 9 and 12.
Screw V gives the gas/air ratio,
graduated 0,75 to 3,0.
Screw N is used to adjust air
excess, graduated - 2 to + 2.