20140257
24
GB
Installation
4.12 Gas pressure
shows minimum load losses at combustion head (
p1) and gas
butterfly valve (
p2) depending on the maximum burner output op-
eration with natural gas and LPG.
p1
- Gas pressure is measured at the test point 1)(Fig. 22), with:
–
combustion chamber at 0 mbar
–
burner working at maximum output
p2
- Load loss at gas butterfly valve 2)(Fig. 22) with maximum
opening: 90°.
NOTE
To know the approximate output at which the burner is operating at
its maximum:
–
subtract the combustion chamber pressure from the gas pres-
sure measured at test point 1)(Fig. 22);
–
find, in the the pressure value closest to the result you want;
–
read the corresponding output on the left.
Example for RX 2500 with natural gas:
–
Maximum output operation
–
Gas pressure at test point 1)(Fig. 22)
=
4 “WC
–
Pressure in combustion chamber
=
1 “WC
4 - 1
=
3 “WC
A maximum output of 9.000 Btu/hr shown in corresponds to 3 “WC
pressure.
This value serves as a rough guide, the effective delivery must be
measured at the gas meter.
Tab. K
MBtu/hr
p1 (“WC)
p2 (“WC)
RX 250
0 S/E
3.400
0.4
0.02
3.900
0.6
0.03
5.000
1.0
0.07
6.000
1.5
0.15
7.000
2.0
0.20
8.000
2.6
0.35
9.000
3.0
0.50
10.000
3.7
0.55
10.500
4.3
0.60
11.500
-
0.80
RX
3000 S
/E
3.400
-
0.02
3.900
0.4
0.03
5.000
0.7
0.07
6.000
1.0
0.15
7.000
1.3
0.20
8.000
1.7
0.35
9.000
2.1
0.50
10.000
2.6
0.55
10.500
2.9
0.60
11.500
3.5
0.80
WARNING
The heat output and gas pressure in the head
data refer to operating with the gas butterfly
valve fully open (90°).
Fig. 22
1
2
D2441
Summary of Contents for RX 2500 S/E
Page 2: ...Original instructions ...
