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Combustin head size 5
kW
1
2
120
0,6
0,1
200
1,4
0,2
300
2,7
0,3
400
4,5
0,4
500
6,7
0,5
600
9,4
0,6
720
13,2
0,7
Combustion head size 6
kW
1
2
150
0,6
0,1
200
1,0
0,1
300
1,9
0,2
400
3,1
0,3
500
4,5
0,4
600
6,2
0,5
700
8,3
0,6
800
10,6
0,7
900
13,2
0,8
(A)
(B)
GAS BURNERS AND RELEVANT GAS TRAINS APPROVED ACCORDING TO EN 676
GAS TRAIN
Ø
Code
1-1/4"
3970256
MB-DLE 412 B01 S52
1-1/2"
3970262
MB-DLE 415 B01 S22
2"
3970263
MB-DLE 420 B01 S22
(C)
∆p (mbar)
3
Ø 1-1/4"
Ø 1-1/2"
3970256
3970262
2,3
3,2
4,6
3,2
8,8
5
14,3
7,5
20,1
10,2
27,1
13,3
35
17
∆p (mbar)
3
Ø 1-1/4"
Ø 1-1/2"
3970256
3970262
2,5
3,2
4,6
3,2
8,8
5
14,3
7,5
20,1
10,2
27,1
13,3
34,4
16,6
42
20,1
-
24,1
COMBUSTION HEAD
Model
Size 5
•
•
•
Ø 2"
3970263
-
3,2
3,4
5,2
7,1
9,6
12,5
Ø 2"
3970263
-
3,2
3,4
5,2
7,1
9,6
12,2
15
17,9
D8866
A
Size 6
Code
•
3000843
•
3000843
•
7
GAS PRESSURE (A)
The adjacent tables show minimum pr essure
losses along the gas supply line depending on
the maximum burner output operation.
Column 1
Combustion head load loss.
Column 2
Load loss at gas butte rfly va lve with maximum
opening: 90°.
Column 3
Load loss a t gas train includ ing: adjustment
valve VR, safety valve V
S ( both fully open) ,
pressure adjuster R, filter F.
The values shown in the various tables refer to:
Natural gas G 20 PCS 11.1kWh/Nm
With:
Natural gas G 25 multiply the values of the tables
by 1.3.
Calculate the approximate maximum output of
the burner in this way:
-
subtract the combustion ch amber pr essure
from the gas pressure measured at test point
3)(A)p.4.
-
Find the nearest pressu
re value to your
result in colu mn 1 of
the ta ble for t he
required burner.
-
Read off the corresponding output on the left.
To c alculate th e required g as pr essure at test
point 3)(A)p.4, set the MAX output required from
the burner operation:
-
find the nearest output value in the table for
the burner in question.
-
Read off the pr essure at test point 3) (A)p.4
on the right in column 1.
-
Add this va lue to the e stimated pr essure in
the combustion chamber.
GAS FEEDING LINE
• The gas tra in is connected to the gas att ach-
ment, with the flange, fixed to the pipe cou-
pling 28)(A)p.4.
• Make sure that the pr essure regulator adjust-
ment r ange ( colour of th e spring) comprises
the pressure required by the burner.
GAS TRAIN (B)
It is type-approved according to EN 676 Regula-
tions.
KEY (B)
F
-
Filter
PG -
Minimum gas pressure switch
R
-
Pressure regulator
VF -
Butterfly valve
VP -
Pilot solenoids
VR -
Adjustment solenoid
VS -
Safety solenoid
KEY (C)
A
-
Gas train/burner adaptor.
Supplied separately from the
optional gas train.
3
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