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4.12.2 Gas pressure
The adjacent diagram is used to calculate manifold pressure taking
into account combustion chamber pressure.
Gas manifold pressure measured at test point 1)(Fig. 27), with:
•
combustion chamber at 0 " WC
•
burner operating at maximum output
•
Combustion head adjusted as indicated in diagram (Fig. 19)
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. 27).
–
Find the nearest pressure value to your result in Fig. 26.
–
Read off the corresponding output on the left.
Example RLS 100/EV:
•
Maximum output operation
•
Natural gas
•
Gas pressure at test point 1)(Fig. 27)
•
Pressure in combustion chamber
4.41 - 0.79
A maximum output of 3616 MBtu/hr shown in Tab. K corresponds
to 3.62" WC pressure, column 1, natural gas.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
MBtu/h
1767
1957
2147
2337
2527
2717
2907
3093
2646
2878
3125
3371
3616
3863
4109
4396
= 4.41" WC
= 0.79" WC
= 3.62" WC
p 1 ("WC)
p 2 ("WC)
2.17
0.2
2.20
0.3
2.24
0.4
2.28
0.4
2.32
0.5
2.36
0.5
2.40
0.5
2.44
0.6
3.15
0.3
3.27
0.4
3.39
0.4
3.50
0.5
3.62
0.5
3.70
0.7
3.82
0.7
3.94
0.9
Installation
RLS 70/EV
RLS 100/EV
D10091
Tab. K
27
GB
D11955
Burner output
D11172
Burner output
Fig. 26
1
2
Fig. 27
20036932
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