Gas Pressure - Riello RS 160/E Installation, Use And Maintenance Instructions

4.10 Gas pressure

The Tab. J shows minimum load losses at combustion head (p1)
and gas butterfly valve (p2) depending on the maximum burner
output operation with natural gas and LPG.
p1 - Gas pressure is measured at the test point 1)(Fig. 21), with:
– combustion chamber at 0 mbar
– burner working at maximum output
– combustion head adjustment as indicated in Fig. 16, page 21.
p2 - Load loss at gas butterfly valve 2)(Fig. 21) with maximum
opening: 90°.
NOTE
To know the approximate output at which the burner is operating at
its maximum:
– subtract the combustion chamber pressure from the gas pres-
sure measured at test point 1)(Fig. 21);
– find, in the Tab. J the pressure value closest to the result you
want;
– read the corresponding output on the left.
Example with natural gas:
– Maximum output operation
– Gas pressure at test point 1)(Fig. 21)
– Pressure in combustion chamber
4.09 - 1.14
A maximum output of 4166 MBtu/hr shown in Tab. J corresponds
to 2.95" WC pressure.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
Installation
Mbtu/hr
= 4.09" WC
= 1.14" WC 3522
= 2.95" WC
3787
4166
4545
4924
5302
5681
6060
6438
6817
7044
23 GB
D2441
p1 ("WC) p1 ("WC) p2 ("WC) p2 ("WC)
Natural Gas LPG Natural Gas
2.20 0.82
2.52 0.93
2.95 1.09
3.39 1.25
3.82 1.41
4.25 1.57
4.69 1.73
5.12 1.89
5.75 2.13
6.50 2.40
6.97 2.58
1
2
Fig. 21
LPG
0.39 0.15
0.43 0.16
0.51 0.19
0.63 0.23
0.75 0.28
0.87 0.32
0.98 0.36
1.10 0.41
1.26 0.47
1.42 0.52
1.50 0.55
Tab. J
20069791