Maximum Liquefied Propane Delivery Capacity; Measuring The Inlet Gas Pressure; To Measure The Inlet Gas Pressure - Navien NPE-180A2 Installation Manual

Maximum Liquefied Propane Delivery Capacity

In Thousands of BTU/H (0.5 in WC Pressure Drop)
Length (including fittings)
Pipe
10 ft 20 ft
Size
(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

3.3.2 Measuring the Inlet Gas Pressure

WARNING
The water heater cannot function properly without sufficient inlet gas pressure. Measuring the inlet gas
pressure should be performed by a licensed professional only.
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 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
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
If gas pressure is out of the acceptable range or an excessive pressure drop is observed, contact the
Note
gas supplier or a qualified installer to supply proper gas pressure to the unit.

To measure the inlet gas pressure:

1. Shut off the manual gas valve on the gas supply line.
30 ft 40 ft 50 ft 60 ft
(9 m) (12 m) (15 m) (18 m)
160 137 122 110
336 287 255 231
632 541 480 434
1,300 1,110 985 892
1,940 1,660 1,480 1,340
3,750 3,210 2,840 2,570
Gas Valve
80 ft 100 ft 125 ft
(24 m) (30 m) (38 m)
101 94 89
212 197 185
400 372 349
821 763 716
1,230 1,140 1,070
2,370 2,200 2,070
/ psi (3.5 kPa). The appliance must be isolated
1
2
/ psi (3.5 kPa).
1
2
Opened Closed
150 ft 175 ft 200 ft 250 ft
(45 m) (53 m) (60 m) (76 m)
84 74 67 62
175 155 140 129
330 292 265 243
677 600 543 500
1,010 899 814 749
1,950 1,730 1,570 1,440
Installing the Water Heater 23