Gas Pressure - Riello RX 2500 S/E Installation, Use And Maintenance Instructions

4.12 Gas pressure

shows minimum load losses at combustion head (p1) and gas
butterfly valve (p2) depending on the maximum burner output op-
eration with natural gas and LPG.
p1 - Gas pressure is measured at the test point 1)(Fig. 22), with:
– combustion chamber at 0 mbar
– burner working at maximum output
p2 - Load loss at gas butterfly valve 2)(Fig. 22) 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. 22);
– find, in the the pressure value closest to the result you want;
– read the corresponding output on the left.
Example for RX 2500 with natural gas:
– Maximum output operation
– Gas pressure at test point 1)(Fig. 22)
– Pressure in combustion chamber
4 - 1
A maximum output of 9.000 Btu/hr shown in corresponds to 3 "WC
pressure.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
20140257
Installation
MBtu/hr
= 4 "WC
3.400
= 1 "WC
3.900
= 3 "WC
5.000
6.000
7.000
8.000
9.000
10.000
10.500
11.500
3.400
3.900
5.000
6.000
7.000
8.000
9.000
10.000
10.500
11.500
WARNING
24 GB
D2441
p1 ("WC)
0.4
0.6
1.0
1.5
2.0
2.6
3.0
3.7
4.3
-
-
0.4
0.7
1.0
1.3
1.7
2.1
2.6
2.9
3.5
The heat output and gas pressure in the head
data refer to operating with the gas butterfly
valve fully open (90°).
1
2
Fig. 22
p2 ("WC)
0.02
0.03
0.07
0.15
0.20
0.35
0.50
0.55
0.60
0.80
0.02
0.03
0.07
0.15
0.20
0.35
0.50
0.55
0.60
0.80
Tab. K