Riello RS 200/E LN, Installation, Use And Maintenance Instructions

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20008113 20
GB
Installation
4.10 Gas supply pressure
The diagram (Fig. 20) show minimum load losses at combustion
head depending on the maximum burner output operation with
natural gas (G 20).
Gas pressure is measured at the test point 1)(Fig. 21), with:
• Combustion chamber at 0 mbar
• Burner working at maximum output
• Ring nut 2) (Fig. 16) adjusted as in the diagram of Fig. 15
NOTE
To know the approximate output at which the burner is operating
at its maximum:
– subtract the combustion chamber pressure from the gas pressu-
re measured at test point 1)(Fig. 21);
– find, in the diagram (Fig. 20) the pressure value closest to the
result you want;
– read the corresponding output on the left.
Example
• Maximum output operation
• Ring nut 2)(Fig. 16) adjusted as in the diagram of Fig. 15
• Gas pressure at test point 1)(Fig. 21) = 9.2 “wc
• Pressure in combustion chamber = 1.2 “wc
9.2 - 1.2 = 8 “wc
A maximum output of 8,000 MBtu/hr corresponds to 8 “wc pres-
sure.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
NOTE
To know the required gas pressure at test point 1) (Fig. 21), set
the maximum output required from the burner operation, then:
– find the nearest output value in the table for the burner in que-
stion.
– read, on the diagram (Fig. 20), the socket pressure 1) (Fig. 21);
– add this value to the estimated pressure in the combustion
chamber.
Example
• Maximum output required: 8,000 MBtu/hr
• Ring nut 2) (Fig. 16) adjusted as in the diagram of Fig. 15
• Gas pressure at output of 8,000 MBtu/hr = 8 “wc
• Pressure in combustion chamber = 1.2 “wc
8 + 1.2 = 9.2 “wc
pressure required at socket 1) (Fig. 21).
Fig. 20
∆
p [ “w
c ]
Burner output operation
D9127
Fig. 21
1
2
D2441