Installation
21
20160778
GB
4.9.3
Gas pressure
The Tab. G is used to calculate manifold pressure taking into ac-
count combustion chamber pressure.
Column 1
Gas manifold pressure measured at test point 1)(Fig. 19), with:
•
Combustion chamber at 0 “WC
•
Burner operating at maximum output
•
Gas ring 2)(Fig. 11, page 17) adjusted as indicated in diagram
(Fig. 12, page 17).
Column 2
•
pressure loss at gas butterfly valve
Calculate the approximate maximum output of the burner as fol-
lows:
subtract the combustion chamber pressure from the gas pres-
sure measured at test point 1)(Fig. 19).
Find the nearest pressure value to your result in column 1 of
the table for the burner in question.
Read off the corresponding output on the left.
Example - RS 100/M:
•
Maximum output operation
•
Natural gas
•
Gas ring Fig. 11, page 17 adjusted as indicated in diagram
(Fig. 12)
•
Gas pressure at test point 1)(Fig. 19)
=
3.15 “WC
•
Pressure in combustion chamber
=
1.18 “WC
3.15 - 1.18
=
1.97 “WC
A maximum output of 3125 MBtu/hr shown in Tab. G corresponds
to 1.97 “WC pressure, column 1.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
Tab. G
WARNING
The heat output and gas pressure data in the
head refer to operation with gas butterfly valve
fully open (90°).
Model
MBtu/hr
kW
p (“ WC)
1
2
RS 70
/M
1761
516
1.65
0.2
1952
572
1.89
0.3
2139
627
2.20
0.4
2330
683
2.52
0.4
2518
738
2.87
0.5
2709
794
3.27
0.5
2897
849
3.66
0.5
3084
904
4.06
0.6
RS 100/M
2631
771
1.46
0.3
2880
844
1.65
0.4
3125
916
1.97
0.4
3371
988
2.28
0.5
3617
1060
2.56
0.5
3862
1132
2.87
0.7
4108
1204
3.27
0.7
4405
1291
3.66
0.9
RS 130
/M
3521
1032
1.50
0.6
3825
1121
1.77
0.7
4129
1210
2.01
0.9
4432
1299
2.28
1.0
4736
1388
2.56
1.1
5036
1476
2.83
1.3
5340
1565
3.11
1.4
5545
1625
3.20
1.6
1
2
Fig. 19
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