4
1
2
3
L1
4
1
2
5
3
P3
L1
(A)
BURNERS AND RELEVANT GAS TRAINS APPROVED ACCORDING TO EN 676
GAS TRAINS - L
Code
Model
3970181
MBD 420
3970182
MBD 420 CT
3970221
MBC-1200-SE-50
3970225
MBC-1200-SE-50 CT
3970222
MBC-1900-SE-65 FC
3970226
MBC-1900-SE-65 FC CT
3970223
MBC-3100-SE-80 FC
3970227
MBC-3100-SE-80 FC CT
(B)
7
11
8
P2
6A
L
7
8
11
P2
6B
L
Ø
C.T.
2"
-
2"
2"
-
2"
DN 65
-
DN 65
DN 80
-
DN 80
P1
12
10
13
P1
12
10
9
13
D3735
8
13
Code
Code
3010123
-
-
-
3010123
-
-
-
3010123
3000825
-
3000825
3010123
3000826
-
3000826
8
GAS LINE
• The gas train can enter the burner from the
right or left side, depending on which is the
most convenient.
• Gas valves must be as close as possible to the
burner to ensure gas reaches the combustion
head within the safety time range of 3 s.
• Make sure that the pressure governor calibra-
tion range (colour of the spring) comprises the
pressure required by the burner.
GAS TRAIN (A)
It is type-approved according to EN 676 Stand-
ards and is supplied separately from the burner
with the code indicated in Table (B).
KEY (A)
1 - Gas input pipe
2 - Manual valve
3 - Vibration damping joint
4 - Pressure gauge with pushbutton cock
5 - Filter
6A - Threaded" Multibloc including:
- filter (replaceable)
- functioning valve
- pressure governor
6B - Flanged" Multibloc including:
- safety valve
- functioning valve
- pressure governor
7 - Minimum gas pressure switch
8 - Gas valve leak detection control device.
In accordance with EN 676 Standards,
gas valve leak detection control devices
are compulsory for burners with maximum
outputs of more than 1200 kW.
9 - Gasket
10 - Standard issue burner gasket
11 - Gas adjustment butterfly valve
12 - Maximum gas pressure switch
13 - Gas train/burner adaptor
- supplied with burner
- supplied on requested separately with the
gas ramp for flanged versions
P1 - Pressure at combustion head
P2 - Up-line pressure valve/adjuster
P3 - Pressure up-line from the filter
L - Gas train supplied separately with the code
indicated in Table (B)
L1 - The responsibility of the installer
KEY TO TABLE (B)
C.T.= Gas valves leak detection control devic-
es:
- = Gas train without gas valve leak de-
tection control device; device that can
be ordered separately and assem-
bled subsequently (see column 8).
= Gas train with assembled VPS valve
leak detection control device.
8
= VPS valve leak detection control de-
vice.
Supplied separately from gas train on
request.
13 = Gas train/burner adaptor.
Supplied separately from gas train on
request.
Note
See the accompanying instructions for the ad-
justment of the gas train.