4.11 Gas Pressure - Riello RS 28/E Installation, Use And Maintenance Instructions

4.11 Gas pressure

The Tab. G is used to calculate manifold pressure taking into ac-
count combustion chamber pressure.
Model MBtu/hr
624
699
795
891
RS 28/E
986
1078
1174
1232
870
979
1099
1211
RS 38/E
1327
1440
1552
1665
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. 16);
 find the nearest pressure value to your result in column A or B
(Tab. G) for the burner in question;
 read off the corresponding output on the left.
Example with natural gas
– Maximum output operation
– Gas ring 2)(Fig. 12) adjusted as indicated in diagram (Fig. 13)
– Gas pressure at test point 1)(Fig. 16)
– Pressure in combustion chamber
3 - 0.8
A maximum output of 990 MBtu/hr shown in Tab. G corresponds to
2.2" WC pressure, column A.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
The data of thermal output and combustion
head gas pressure are related to full open (90°)
gas butterfly valve.
WARNING
p (" WC)
kW
A B
183 0.98 0.98
205 1.22 1.3
233 1.57 1.69
261 1.85 2.05
289 2.17 2.28
316 2.48 2.68
344 2.76 3.07
361 2.95 3.58
255 1.02 1.02
287 1.22 1.38
322 1.46 1.77
355 1.69 2.28
389 1.89 2.72
422 2.13 3.11
455 2.36 3.54
488 2.6 4.21
Tab. G
= 3" WC
= 0.8" WC
= 2.2" WC
Installation
19 GB
D2786
Fig. 16
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