03/2008 - Art. Nr. 13 013 477C
10
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
Summary of Contents for C120 GX507/8
Page 40: ...03 2008 Art Nr 13 013 477C 40 1 pF VGD SKP 180 SKP 3 SKP 180 F D...
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Page 44: ...03 2008 Art Nr 13 013 477C 44 5 1 1 6 F 5 6 5 0 5 3 1 3 6 5 6 3 0 3...
Page 54: ...03 2008 Art Nr 13 013 477C 54 D 1 RTC 2 J1 1 RTC 1 pF 2...