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20019904
24 GB
Installation
4.12.3 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. 23), with:
•
combustion chamber at 0” WC
• burner operating at maximum output
• natural gas
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. 23);
– find the nearest pressure value to your result in the diagram for
the burner;
– read off the corresponding output.
Example - RLS 100/M
Maximum output operation
Natural gas
Gas pressure at test point 1)(Fig. 23)
= 2.94” WC
Pressure in combustion chamber = 0.79” WC
2.94 - 0.79 = 2.15” WC
A maximum output of 3550 MBtu/hr shown in diagram corresponds
to 2.15” WC pressure.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
Tab. K
1
2
Fig. 23
D10091
Model MBtu/hr kW

p
[
“WC
]
RLS 70/M 1761 516 0.2
1952 572 0.3
2139 627 0.4
2330 683 0.4
2518 738 0.5
2709 794 0.5
2897 849 0.5
3094 907 0.6
RLS 100/M 2646 775 0.1
3800 1113 0.2
4100 1201 0.2
RLS 130/M 3500 1026 0.2
4500 1319 0.3
5292 1551 0.4
D10913

p
[
“WC
]

p
[
“WC
]

p
[
“WC
]
RLS 70/M
RLS 100/M
RLS 130/M
Fig. 24