Gas Train; Gas Pressure - Riello RS 45/E LN Installation, Use And Maintenance Instructions

4.10 Gas train

It must be type-approved according to UL Standards and is sup-
plied separately from the burner.
See the accompanying instructions for the ad-
justment of the gas train.
WARNING
Key to layout
1 Gas input pipe
2 Manual valve
3 Pressure regulator
4 Low gas pressure switch
st
5 1 safety shut off valve
nd
6 2 safety shut off valve
7 Standard issue burner gasket with flange
8 Gas adjustment butterfly valve
9 Burner

4.11 Gas pressure

The Tab. D is used to calculate manifold pressure taking into ac-
count combustion chamber pressure.
MBtu/hr kW
720 211
949 278
1136 333
1327 389
1515 444
1706 500
1894 555
2085 611
Gas manifold pressure measured at test point 1)(Fig. 19), with:
• combustion chamber at 0" WC;
• burner operating at maximum output;
• column 1: gas ring R2-R3)(Fig. 13) adjusted as indicated in di-
agram (Fig. 14);
• column 2: pressure loss at gas butterfly valve 8)(Fig. 18) with
maximum opening: 90°.
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 nearest pressure value to your result in column 2 for
the burner in question;
 read off the corresponding output on the left.
20026767
Installation
p ("WC)
1 2
1.38 0.12
2.16 0.15
2.90 0.19
3.66 0.23
4.21 0.27
4.72 0.31
5.12 0.35
5.31 0.39
Tab. D
20
D2294
Example with natural gas G20
– Maximum output operation
– Gas ring 2-5)(Fig. 13) adjusted as indicated in diagram
(Fig. 14)
– Gas pressure at test point 1)(Fig. 19)
– Pressure in combustion chamber
3.69 - 0.79
A maximum output of 1136 MBtu/hr shown in Tab. D corresponds
to 2.90" WC pressure, column 1.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
GAS PILOT LINE
MAIN GAS LINE
Fig. 18
= 3.69" WC
= 0.79" WC
= 2.90" WC
D2786
Fig. 19