Navien NFB Series User Manual

109Appendixes
# Description Part # Remark
1 Heat Exchanger Assembly
30019155A NFB-200
30019724A NFB-175
2 Drain Pan Assembly 30019173A
3 Supply Pipe (Upper) 30019177A
4 Packing (P27) 20041401A
5 Heat Exchanger Outlet Adapter 30019645A
6 Supply Pipe (Lower) 30019176A
7 Fastener 20040255A
8 Heating Supply Adapter 20040244A
9 LWCO (Pressure Sensor) 30013223A
10 LWCO (Pressure Sensor) Packing 20006873A
11 Heat Exchanger Inlet Adapter 30019648A
12 Return Pipe 30019175A
13 Thermistor 30012907A
14 Air Pressure Sensor 30015811A
15 Drain Pan Packing 20040241A
16 Exhaust Duct (Lower) 20040242A
17 Exhaust Duct Clip 20042741A
18 Exhaust Duct Packing (G90) 20027350A
19 Exhaust Duct Packing (P85) 20042823A
20 Exhaust Duct (Upper) 20040727B
21 Exhaust Duct Cap 20029712A
22 Exhaust Duct Packing (Upper) 20024690A
23 Thermistor (Exhaust) 30009478A
24 Heat Exchanger Drain Cap 20042237A
25 High Limit Switch 30002558A
26 O-ring (V32) 20041403A
27 O-ring (P26) 20032409A
28 Drain Pan Adapter 20041181A
29 Packing (Drain Pan Adapter) 20041449A
30 Screw (M4X6) 20038752A
31 Screw (M8X20) 20042814A

Navien NFB Series Specifications

General

Type	Condensing Boiler
Fuel Type	Natural Gas or Propane
Heat Exchanger	Stainless Steel
Vent Type	Direct Vent
Vent Diameter	2" or 3"