Cuenod C.120 GX 507 T2 [10/56] Description and settings mbvef gas valve

Cuenod C.120 GX 507 T2 [10/56] Description and settings mbvef gas valve
03/2008 - Art. Nr. 13 013 477C10
Start-up
Description and settings
MBVEF gas valve
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 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 correcting
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 sides
17 On indicator V1, V2 (optional)
18 pBr - pL - pF pressure take-off
pipes
MB VEF valve
MB VEF valve … is a compact
assembly including the following:
A screen, 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.
The valve is delivered preset
according to table herebelow.
Setting gas pressure switch
• Remove transparent cover. Unit
includes a index and graduated
mobile disk.
• Provisionally set pressure switch to
the minimum value shown on
graduated disk.
Setting regulator
All settings are performed with burner
on.
• Use 2.5 mm-hex key to turn both
following screws :
- Screw V provides gas/air ratio;
graduated 0.75 to 3.0
- Screw N enables to adjust excess
air to minimal flow; graduated -2 to
+2.
Gas : pressure(s) VEF 412 420 425
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
V
1,25
N
0
G31:148
G20:100,150
G20:300
G25:300
Burner C 210 GX 507/8
G20:50
G31:37
G31:148
G20:300
G25:300
Burner C 160 GX 507/8
G20:40,50,100,150
G20:20,25,40,50
G25:25
G31:37
G31:148
Burner C 120 GX 507/8
G20:100,150,300

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