Cuenod C 75 Instrucciones De Montaje página 37

Start up
Description Settings
Gas valve
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 here below.
V
Setting regulator
All settings are performed with burner
on.
· Set using a 2.5mm hex key/spider
N
wrench on two screws marked 9
and 12.
–
Screw V provides gas/air ratio;
graduated 0.75 to 3.0
–
Screw N allows adjustment of
excess air to minimal flow;
graduated -2 to +2.
06/2006 - Art. Nr. 13 013 497B
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
Setting gas pressure switch
· Remove transparent cover. Unit
includes a x index and graduated
mobile disk.
· Provisionally set pressure switch to
the minimum value shown on
graduated disk.
Burners C 75/100 B 517/8
Gas p VEF 407 412 420 425
V
20-25
G20
40-50
N
V
G25 25
N
V 1,35
G20 50-100
N -0,5
V 1,5
G20 300
N 0,5
V 1,35
G31 30-37-50
N -0,5
V 1,5
G31 148
N 0,5
EN
1,25
0
1,25
0
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