Gas Train; Gas Pressure - Riello RS 50/E 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. I is used to calculate manifold pressure taking into ac-
count combustion chamber pressure.
Model MBtu/hr
1099
1249
1402
1552
RS 50/E
1706
1856
2006
2197
Gas manifold pressure measured at test point 1)(Fig. 19), with:
– combustion chamber at 0" WC;
– burner operating at maximum output;
– column A (Tab. I): gas ring 2)(Fig. 13) adjusted as indicated in
diagram (Fig. 14).
– column B (Tab. I): gas ring 2)(Fig. 13) adjusted to zero.
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 A or B
(Tab. I) for the burner in question;
 read off the corresponding output on the left.
Example with natural gas
– Maximum output operation
– Gas ring 2)(Fig. 13) adjusted as indicated in diagram (Fig. 14)
– Gas pressure at test point 1)(Fig. 19)
– Pressure in combustion chamber
2.48 - 0.79
A maximum output of 1552 MBtu/hr shown in Tab. I corresponds to
1.69" WC pressure, column A.
p (" WC)
kW
A B
322 0.87 0.87
366 1.14 1.3
411 1.42 1.61
455 1.69 2.01
500 1.97 2.36
544 2.2 2.76
588 2.48 3.15
644 2.83 3.78
= 2.48" WC
= 0.79" WC
= 1.69" WC
Installation
D2294
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
Tab. I
21
GAS PILOT LINE
MAIN GAS LINE
Fig. 18
D2786
Fig. 19
20053677