Gas Pressure - Riello RS 190/M Installation, Use And Maintenance Instructions

4.8.3

Gas pressure

The Fig. 18 is used to calculate manifold pressure taking into ac-
count combustion chamber pressure.
Gas manifold pressure measured at test point 1)(Fig. 19), with:
• combustion chamber at 0 "WC;
• burner operating at maximum output;
• combustion head adjusted as indicated in diagram, (Fig. 11,
page 16).
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 pressure value in diagram, (Fig. 18);
 read off the corresponding output on the left.
Example:
• Maximum output operation
• Natural gas
• Gas pressure at test point 1)(Fig. 19)
• Pressure in combustion chamber
3.15 - 1.18
A maximum output of 6700 MBtu/hr shown in corresponds to 3.8
"WC pressure, (Fig. 18).
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
The heat output and gas pressure data in the
head refer to operation with gas butterfly valve
fully open (90°).
WARNING
20160742
Installation
= 5.0 "WC
= 1.2 "WC
= 3.8 "WC
20 GB
1
20161046
D3190
Fig. 18
2
Fig. 19