Gas Connections - Bosch 125B NGS Installation And Operating Instructions Manual

GAS CONNECTIONS and Gas Regulator
NOTE: The Aquastar 125 B"S" is supplied with a gas pressure regulator that must be installed on the heater before
attaching the gas supply line. See figure 5. Failure to install the gas regulator as shown in figure 5 will be a violation
of CSA certification of the unit. The regulator supplied with the heater is preset for the gas shown on the rating
plate to the correct pressure. It is an appliance level regulator designed for (low inlet) pressure (less than 1/2 Psig
or 15" W.C.) DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial
natural gas line.
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour
for Gas Pressure of 0.5 Psig or less and a Pressure drop of
0.3 in Water Column.
(Based on a 0.60 Specific Gravity Gas) Btu numbers given
in thousands.
Nominal
Iron
Pipe Internal
Size, Diameter
inches inches 10
1/4 0.364 32
3/8 0.493 72
1/2 0.622 132
3/4 0.824 278
1 1.049 520
1 1/4 1.380 1050
1 1/2 1.610 1600
2 2.067 3050
2 1/2 2.469 4800
3 3.068 8500
4 4.026 17,500 12,000 9,700 8,300
FOR LP GAS
Maximum Capacity of Pipe in Thousands of
BTU per Hour of Undiluted Petroleum Gases
(at 11 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Wa-
ter Column).
Maximum Capacity of Semi-Rigid
Tubing in Thousands of BTU per Hour of
Undiluted Liquified Petroleum Gases (at 11
inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water
Column)
* Source National Fuel Gas Code NFPA 54, ANSI Z223. 1 - No
Additional Allowance is necessary for an ordinary number of fittings
10
GAS LINE SIZING
Length of Black Iron Pipe, Feet
20 30 40 50
22 18 15 14
49 40 34 30
92 73 63 56
190 152 130 115
350 285 245 215
730 590 500 440
1100 890 760 670
2100 1650 1450 1270 1150 1050
3300 2700 2300 2000 1850 1700 1600 1500 1400 1250
5900 4700 4100 3600 3250 3000 2800 2600 2500 2200
7,400 6,80 6,200 5,800 5,400 5,100 4,500
nominal
Iron Pipe
Size,
Inches
1/2
3/4
1
1 1/4 220 149 121
1 1/2 330 229 185
2
Outside
Diameter,
Inch
3/8
1/2
5/8
3/4
7/8
Follow boxed numbers for piping just one Aquastar 125BS
(example: 3/4" B.I. Natural Gas pipe for 30 ft. will handle
152,000 btu's). For multiple appliances combine the total
btu input load and then refer to applicable chart below.
60 70 80 90
12 11 11 10
27 25 23 22
50 46 43 40
105 96 90 84
195 180 170 160
400 370 350 320
610 560 530 490
990 930
Black Iron Pipe
Length of Pipe, Feet
10 20 30 40 50 60
275 189 152 129 114 103
567 693 315 267 237 217 196 185 173
107 732 590 504 448 409 378 346 322
103 913 834 771 724 677
155 141 127 118 108 102
622 433 346 299 264 239 220 204 192 1811 1606 1496
Copper
Length of Tubing, Feet
10 20 30 40 50
_
39 26 21 19
92 62 50 41 37
199 131 107 90 79
329 216 181 145 131
501 346 277 233 198
100 125 150 175
9 8 8 7
21 18 17 15
38 34 31 28
79 72 64 59
150 130 120 110
305 275 250 225
460 410 380 350
870 780 710 650
1130 1050
2000 1850 1700
4,100 3,800 3500
70 80 90 100 125 150
96 89 83 78 69 63
162 146 132
307 275 252
630 567 511
976 866 787
60 70 80 90 100
_ _ _ _ _
35 31 29 27 26
72 67 62 59 55
121 112 104 95 90
187 164 155 146 138
200
6
14
26
55
100
210
320
610
980
Fig. 4
6 720 606 518