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/EV
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
20040438