Navien NHB-055 Service Manual page 24

Maximum Liquefied Propane Delivery Capacity
In Thousands of BTU / H (0.5" WC Pressure Drop)
Length (including fittings)
Pipe Size
10 ft. 20 ft.
(3 m) (6 m)
/ in 291 200
1
2
/ in 608 418
3
4
1 in 1,150 787
1 / in 2,350 1,620
1
4
1 / in 3,520 2,420
1
2
2 in 6,790 4,660
The inlet gas pressure must be maintained between 3.5 in and 10.5 in WC for natural gas and between 8.0 in and 13.5 in WC for liquefied
propane.
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that
system at test pressures in excess of
The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of
the gas supply piping system at test pressures equal to or less than
NOTE
For installations using CSST (flexible) gas piping, please refer to the sizing charts provided by the manufacturer.
●
The use of single-stage regulators are recommended. Dual-stage regulators could cause operational issues with the boiler.
●
24 NHB Service Manual
30 ft. 40 ft. 50 ft.
(9 m) (12 m) (15 m)
160 137 122
336 287 255
632 541 480
1,300 1,110 985
1,940 1,660 1,480
3,750 3,210 2,840
/ psi (3.5 kPa).
1
2
60 ft. 70ft. 80ft.
(18 m) (21m) (24m)
110 101 94
231 212 197
434 400 372
892 821 763
1,340 1,230 1,140
2,570 2,370 2,200
/ psi (3.5 kPa).
1
2
90ft. 100ft. 125ft.
(27m) (30m) (38m)
89 84 74
185 175 155
349 330 292
716 677 600
1,070 1,010 899
2,070 1,950 1,730
200 ft. 250 ft.
(60 m) (76 m)
67 62
140 129
265 243
543 500
814 749
1,570 1,440
Version 1.0