Gas Pressure - Riello RLS 190/E Installation, Use And Maintenance Instructions

4.12.2 Gas pressure

The adjacent diagrams are used to calculate manifold pressure
taking into account combustion chamber pressure.
Gas manifold pressure measured at test point 1)(Fig. 29), with:
• combustion chamber at 0" WC
• burner operating at maximum output
• combustion head adjusted as indicated in diagram (Fig. 20)
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. 29).
– Find the nearest pressure value to your result in Fig. 28.
– Read off the corresponding output on the left.
Example
• Maximum output operation
• Natural gas
• Gas pressure at test point 1)(Fig. 29)
• Pressure in combustion chamber
8.0 - 1.2
A maximum output of 6500 MBtu/hr shown in diagram corresponds
to 6.8" WC pressure.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
MBtu/hr kW
3553 1100
4095 1200
4435 1300
4775 1400
5120 1500
5460 1600
5800 1700
6140 1800
6480 1900
6874 2000
7560 2150
* The values are referred to the butterfly gas valve.
20095074
Installation
= 8.0" WC
= 1.2" WC
= 6.8" WC
p ("WC)
1 2*
3.04 0.4
4.00 0.6
4.60 0.7
5.20 0.8
5.90 0.9
6.60 1.0
7.40 1.1
7.80 1.2
8.04 1.3
9.42 1.3
10.50 1.5
26 GB
Burner output
1
D2441
D11133
Fig. 28
2
Fig. 29