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4.13 Gas train
Explosion danger due to fuel leaks in the presence
of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure that the fuel interception tap is closed
before performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
It must be type-approved according to UL Standards and is sup-
plied separately from the burner.
Legend (Fig. 22)
1
Gas input pipe
2
Manual valve
3
Pressure regulator
4
Minimum gas pressure switch
4.14 Gas pressure
The adjacent tables are used to calculate manifold pressure taking
into account combustion chamber pressure.
Gas manifold pressure measured at test point 1)(Fig. 23), with:
•
Combustion chamber at 0" WC
•
Burner operating at high fire
•
column 1: pressure loss at the combustion head;
•
Natural gas
Calculate the approximate high fire output of the burner as follows:
–
subtract the combustion chamber pressure from the gas pres-
sure measured at test point 1)(Fig. 23).
–
Find the nearest pressure value to your result in the table for
the burner in question.
–
Read off the corresponding output on the left.
Example
High fire operation
Natural gas
Gas pressure at test point 1)(Fig. 23)
Pressure in combustion chamber
5.24 - 0.79
A high fire ouput of 1704 MBtu/hr shown in Tab. K corresponds to
4.45" WC pressure.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
RLS 38/E
MBtu/hr
882
985
1098
1212
1325
1440
1553
1666
20027066
Installation
=
5.24" WC
=
0.79" WC
=
4.45" WC
∆p (" WC)
Natural gas
3.46
3.58
3.70
3.86
4.09
4.37
4.65
5.11
Tab. J
24
5
Safety solenoid
6
2nd safety shutt-off valve
7
Standard issue burner gasket with flange
8
Gas adjustment butterfly valve
9
Burner
D10471
RLS 50/E
MBtu/hr
1092
1250
1401
1553
1704
1856
2007
2198
GB
Fig. 22
∆p (" WC)
Natural gas
3.94
4.02
4.13
4.25
4.45
4.61
5.00
5.51
Tab. K
D2545
Fig. 23
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