Gas Piping - PF NPM15-10-24 Installation And Operation Manual

4.3 COMBUSTION CHAMBER SIZING
Table 1. Combustion Chamber Recommended Dimensions
Gas Input
MBTU/HR
450
600
700
850
4.4 Whichever method of mounting is chosen, the burner blast tube must be recessed into the front wall
surface from 0" to 1/2".
NOTE: Serious Damage To The Burner May Result If The Blast Tube is
Extended Into The Combustion Chamber.
Secure the burner to the heat exchanger or boiler, using the burner-mounting flange. A tight seal
4.5
between the mounting flange and the front plate should be made using the factory-furnished gasket or
ceramic non-asbestos fiber rope .
5

GAS PIPING

Contact you local gas service company to ensure that adequate gas service is available and to review
5.1
applicable installation codes for your area. All gas piping installations must be in accordance with NFPA
54, National Fuel Gas Code, Definitions and General Field Recommendations, CGA 3.0, Canadian
Natural Gas Installation Code CAN/CGA B149.1 or Propane Installation Code, CGA B 149.2.
5.2 Size the main gas line in accordance with Table 2. The figures shown are for straight lengths of pipe at
0.2" W.C. pressure drop, which is considered normal for low-pressure systems. Note that fittings such as
elbows and tees will add to the pipe pressure drop.
Table 2 - Gas Piping Pressure Drop Data
Pipe Size In Inches
1"
1-1/4"
1-1/2"
2"
2-1/2"
EQUIVALENT LENGTHS OF STANDARD PIPE IN FEET FOR LISTED FITTINGS
Fitting Type
Std. Tee
Std. Elbow
Refer to Figure 3 for details of standard gas piping. (Also refer to any additional piping diagrams supplied
5.3
for this specific unit.)
5.4 Mount leakage test and main gas cocks, main automatic gas valve or combination gas valve/pressure
regulator, and auxiliary valves (if required and not factory mounted) per piping diagram or Figure 3 on
page 4.
Width
Inches
15
16
17
18
EQUIVALENT LENGTH OF STRAIGHT PIPE IN FEET
20 30 40
CFH GAS WITH .2" PRESSURE DROP
300 250 210
520 425 360
800 690 560
1700 1400 1200
3000 2500 2100
1" 1-1/4" 1½"
5.5 7.5 9.0
2.7 3.7 4.5
Length Gas Input
Inches MBTU/HR
20 1260
23 1500
25 1800
26 2200
50 60 80
190 180 150
325 300 260
500 480 410
1100 1000 850
1900 1800 1550
2" 2-1/2" Nominal Pipe Size In Inches
12.0 13.5
5.5 6.1
3
Width
Inches
23
25
26
28
100 150 200
135 110 75
230 190 165
370 300 260
750 600 540
1375 1100 950
Length
Inches
33
38
40
42