Cuenod C 120 Instrucciones De Montaje página 37

Start-up
Description and 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 herebelow.
Burner C 120 B 517/8
Gas :
VEF 412
pressure(s)
G20:20-25-40-50 V
G25:25
N
G20:100,150,300 V 1,25
0
N
G31:37
V
N
G31:148 V 1,25
N 0
Burner C160 B 517/8
G20:40,50,100,150
V
N
G20:300 V 1,25
G25:300
N 0
G31:37 V
N
G31:148
V 1,25
N 0
Burner C210 B 517/8
G20:50 V
N
G20:100,150
V
N
G20:300 V 1,25
G25:300
N 0
G31:148 V 1,25
N 0
420 425
1,25
0
1,25
0
1,25
0
1,25
0
V
1,25
0
1,25
0
05/2006 - Art. Nr. 13 013 500B
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.
Setting regulator
All settings are performed with burner
on.
· Use 2.5-mm hex key to turn both
N
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.
EN
37