Gas Pressure - Riello C9337401 Installation, Use And Maintenance Instructions

4.12.1 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. 31), with:
• combustion chamber at 0" WC
• burner operating at maximum output
• Combustion head adjusted as indicated in diagram (Fig. 22)
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. 31).
– Find the nearest pressure value to your result in Fig. 30.
– Read off the corresponding output on the left.
Example
• Maximum output operation
• Natural gas
• Gas pressure at test point 1)(Fig. 31)
• Pressure in combustion chamber
7.2 - 1.2
A maximum output of 6500 MBtu/hr shown in diagram corresponds
to 6.0" WC pressure.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
kW MBtu/hr
930
996
1099
1202
1400
1500
1600
1700
1861
2051
* The values are referred to the butterfly gas valve.
= 7.2" WC
= 1.2" WC
= 6.0" WC
p ("WC)
2*
3175 0.35
3400 0.39
3750 0.50
4100 0.63
4780 0.86
5120 1.00
5460 1.15
5800 1.30
6350 1.50
7000 1.65
Installation
D3188
25
GB
Burner output
1
D2441
Fig. 30
2
Fig. 31
20026897