Noritz CB180-DV - Gas Line Sizing for a Noritz Condensing Gas Combi Boiler

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Gas Supply Piping
Chapter4.–Installation
Pipe
size
Length (ft)
10'(3m) 20'(6m) 30'(9m) 40'(12m) 50'(15m) 60'(18m) 70'(21m) 80'(24m) 90'(27m) 100'(30m) 125'(37.5m)
3/4˝ 360 247 199 170 151 137 126 117 110 104 92
1˝ 678 466 374 320 284 257 237 220 207 195 173
1-1/4˝ 1390 957 768 657 583 528 486 452 424 400 355
1-1/2˝ 2090 1430 1150 985 873 791 728 677 635 600 532
2" 4020 2760 2220 1900 1680 1520 1400 1300 1220 1160 1020
2 1/2" 6400 4400 3530 3020 2680 2430 2230 2080 1950 1840 1630
3" 11300 7780 6250 5350 4740 4290 3950 3670 3450 3260 2890
4" 23100 15900 12700 10900 9660 8760 8050 7490 7030 6640 5890
Pipe
size
Length (ft)
10'(3m) 20'(6m) 30'(9m) 40'(12m) 50'(15m) 60'(18m) 70'(21m) 80'(24m) 90'(27m) 100'(30m) 125'(37.5m)
1/2˝ 454 312 250 214 190 172 158 147 138 131 116
3/4˝ 949 652 524 448 397 360 331 308 289 273 242
1˝ 1787 1228 986 844 748 678 624 580 544 514 456
1-1/4˝ 3669 2522 2025 1733 1536 1392 1280 1191 1118 1056 936
1-1/2˝ 5497 3778 3034 2597 2302 2085 1919 1785 1675 1582 1402
2" 10588 7277 5844 5001 4433 4016 3695 3437 3225 3046 2700
2 1/2" 16875 11598 9314 7971 7065 6401 5889 5479 5140 4856 4303
3" 29832 20503 16465 14092 12489 11316 10411 9685 9087 8584 7608
4" 43678 30020 24107 20632 18286 16569 15243 14181 13305 12568 11139
Gas Line Sizing for a Noritz Condensing Gas Combi Boiler
Table 2. For 8" WC ~ 10.5" WC initial supply pressure
Table 1. For Less than 8" WC initial supply pressure
Table 3. Maximum Undiluted Propane (LP) Delivery Capacity in Thousands of Btu/H (0.5" WC Pressure Drop)
Maximum Natural Gas Delivery Capacity (0.5" WC Pressure Drop)
Maximum Natural Gas Delivery Capacity (3.0" WC Pressure Drop).
Contact the Gas Supplier for Btu/Cubic Ft. of the Supplied Gas. 1000 BTU/Cubic Ft. is a Typical Value
** For reference only. Please consult gas pipe manufacturer for actual pipe capacities
.
** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
Instructions
1. Size each outlet branch starting from the furthest using the Btu/h required
and the length from the meter.
2. Size each section of the main line using the length to the furthest outlet
and the Btu/h required by everything after that section.
Sample Calculation
Outlet A: 45' (13.5m) (Use 50' (15m)), 50,000 Btu/h requires 1/2"
Outlet B: 40' (12m), 65,000 Btu/h requires 1/2"
Section 1: 45' (13.5m) (Use 50' (15m)), 115,000 Btu/h requires 3/4"
Outlet C: 30' (9m), 35,000 Btu/h requires 1/2"
Section 2: 45' (13.5m) (Use 50' (15m)), 150,000 Btu/h requires 3/4”
Outlet D: 25' (7.5m) (Use 30' (9m)), 25,000 Btu/h requires 1/2"
Section 3: 45' (13.5m) (Use 50' (15m)), 175,000 Btu/h requires 1"
Outlet E: 25' (7.5m) (Use 30' (9m)), 199,000 Btu/h requires 3/4" (CB199-DV)
180,000 Btu/h requires 3/4" (CB180-DV)
Section 4: 45' (13.5m) (Use 50' (15m)),374,000 Btu/h requires 1-1/4"(CB199-DV)
355,000 Btu/h requires 1-1/4”(CB180-DV)
Noritz Condensing Gas Combi Boiler.
Pipe
size
Length (ft)
10'(3m) 20'(6m) 30'(9m) 40'(12m) 50'(15m) 60'(18m) 80'(24m) 100'(30m) 125'(38m) 150'(45m) 175'(53m) 200'(60m) 250'(76m)
1/2˝ 275 189 152 129 114 103 96 89 83 78 69 63 55
3/4˝ 567 393 315 267 237 217 196 185 173 162 146 132 112
1˝ 1071 732 590 504 448 409 378 346 332 307 275 252 213
1-1/4˝ 2205 1496 1212 1039 913 834 771 724 677 639 567 511 440
1-1/2˝ 3307 2299 1858 1559 1417 1275 1181 1086 1023 976 866 787 675
2˝ 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496 1260
(CB199-DV: 199,000 Btuh)
(CB180-DV: 180,000 Btuh)