Gas Piping Requirements - Daikin Rebel Applied DPSA Installation And Start-Up Manual

Gas Piping Requirements

Gas Pressure Requirements
Inlet gas pressure must be maintained at 7.0" wc for Natural
Gas and 11.0" wc for Propane. Maximum inlet pressure must
not exceed 13.0" wc to prevent damage to the gas valve.
Gas piping must be sized and routed to provide the minimum
required pressure when the burner is operating at maximum
input. Consult your local utility on any questions on gas
pressure available, allowable pipe pressure drops, and local
piping requirements. Table 16,
for sizing reference.
Table 18: Natural Gas Pipe Flow Capacity* (CFH)
Pipe Length
½
(ft)
10 132
20 92
30 73
40 63
50 56
60 50
70 46
80 53
90 40
100 38
125 34
150 31
175 28
200 26
*Assuming Pressure Drop of 0.3" Wc & Specific Gravity of 0.60
Table 19: Conversion for Specific Gravities other than 0.60
Natural Gas
0.50
0.60
0.70
0.80
0.90
1.00
Propane-Air
1.10
Propane
1.55
Butane
2.00
IM 1287 • REBEL APPLIED ROOFTOP
Table 17, and Table 18 provided
Gas Capacity in CFH
Pipe Size-inches (Ips)
¾ 1 1¼
278 520 1050
190 350 730
152 285 590
130 245 500
115 215 440
105 195 400
96 180 370
90 170 350
84 160 320
79 150 305
72 130 275
64 120 250
59 110 225
55 100 210
Multiplier
1.100
1.000
0.936
0.867
0.816
0.775
Multiplier
0.740
Multiplier
0.622
Multiplier
0.547
Install all piping in accordance with the National Fuel Gas Code
(ANSI Z223 .1), (NFPA 54-1999) and any applicable local codes.
Remove all burrs and obstructions from pipe. A drip leg must
be installed in the vertical line before each burner such that it
will not freeze. All pipe threads must have a pipe dope which is
resistant to the action of LP gas .
After installation, pressurize the piping as required and test
all joints for tightness with a rich soap solution or UL 913
combustible gas leak detector. Any bubbling is considered a
leak and must be eliminated.
1½ 2
1600 2050
1100 2100
890 1650
760 1450
670 1270
610 1150
560 1050
530 990
490 930
460 870
410 780
380 710
350 650
320 610
Table 20: Conversion for Pressure Drop other than 0.3"
Inches W .C .
Multiplier
Pressure Drop
0.1 0.577
0.2 0.815
0.3 1.000
0.4 1.16
0.6 1.42
0.8 1.64
88
Unit Maintenance
2½ 3
4800 8500 17500
3300 5900 12000
2700 4700 9700
2300 4100 8300
2000 3600 7400
1850 3250 6800
1700 3000 6200
1600 2800 5800
1500 2600 5400
1400 2500 5100
1250 2200 4500
1130 2000 4100
1050 1850 3800
980 1700 3500
Inches W .C .
Multiplier
Pressure Drop
1.0 1.83
2.0 2.58
3.0 3.16
4.0 3.65
6.0 4.47
8.0 5.15
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