Installation
23
20017786
4.11
Gas pressure
The adjacent diagrams are used to calculate manifold pressure
taking into account combustion chamber pressure.
Diagrams (Fig. 20)
Gas manifold pressure measured at test point 1)(Fig. 21), with:
Combustion chamber at 0 “WC
Burner operating at maximum output
Gas ring adjusted as indicated in diagram (Fig. 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. 21).
Find the nearest pressure value to your result in the diagram for
the burner in question.
Read off the corresponding output on the left.
Example - RS 100/E:
• Maximum output operation
• Natural gas
• Gas ring adjust as indicated in diagram (Fig. 16)
• Gas pressure at test point 1)(Fig. 21)
= 3.15 “WC
• Pressure in combustion chamber
= 1.18 “WC
3.15 - 1.18
= 1.97 “WC
A maximum output of 2815 MBtu/hr shown diagram RS 100/E
corresponds to 1.97 “WC pressure.
This value serves as a rough guide, the effective delivery must
be measured at the gas meter.
Fig. 20
D3123
p
[
“WC
]
p
[
“WC
]
p
[
“WC
]
RS 70/E
RS 100/E
RS 130/E
D3344
Fig. 21
