Component Assembly Diagrams and Part Lists - 12.6 Appendixes

Oct 26, 2026

Component assembly diagrams and parts lists for multiple assemblies identified by NFB-301C and NFB-399C. The material enumerates case, cover, main and terminal PCBs, front panel, air duct assemblies, filters, brackets, power transformer, heating adapters, handles, and air pressure sensors. It further lists heat exchanger and waterway components including pipes, adapters, thermistors, switches, O-rings, exhaust ducts, caps, and fasteners, plus combustion parts such as fans, venturi, gas orifices, and packing.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages14

Reading Time35 min

AccessFree to download

12.6 Component Assembly Diagrams and Part Lists

12.6.1 Case Assembly - NFB-301C

12.6.2 Case Assembly - NFB-399C

12.6.3 Heat Exchanger and Waterway Assembly - NFB-301C

12.6.4 Heat Exchanger and Waterway Assembly - NFB-399C

12.6.5 Combustion Parts Assembly - NFB-301C

12.6 Component Assembly Diagrams and Part Lists 12.6.1 Case Assembly-NFB-301C 120 Appendixes | \# | Description | Part \# | Remark | | --- | --- | --- | --- | | 1 | Case Upper | 20042573A | | | | (SET) Case Upper | 30023701A | NFB-301C SERVICE KIT | | | Case Middle | 20042572A | | | | Case Lower | 20042571A | | | | (SET) Case Lower | 30023702A | NFB-301C SERVICE KIT | | 2 | Cover | 30020590A | | | | (SET)Cover | 30023383A | NFB-301C SERVICE KIT | | 3-1 | Main PCB | 30020431A | | | 3-2 | Terminal PCB | 30020433A | | | 4 | Front Panel | 30019786A | | | 5 | Exhaust Duct Assembly | 30020520A | | | 6 | Intake Air Duct Assembly | 30020519A | | | 7-1 | Air Filter Case | 20046047A | | | 7-2 | Air Filter | 20046201A | | | 8 | PCB Lower Bracket | 20040181A | | | 9 | Rubber Ring | 20041970A | | | 10 | 24 V Power Transformer | 30019688A | | | 11 | Heating Supply Adapter (Air Vent Adapter) | 20043650A | | | 12 | Base Packing | 20042901A | | | 13 | Drain Pan Adapter Lower Bracket | 20043583A | | | 14 | Handle | 20044467A | | | 15 | Air Pressure Sensor | 30013265A | | Appendixes 121 12.6.2 Case Assembly-NFB-399C 122 Appendixes | \# | Description | Part \# | Remark | | --- | --- | --- | --- | | 1 | Case Upper | 20042659A | | | | (SET) Case Upper | 30023699A | NFB-399C SERVICE KIT | | | Case Middle | 20042521A | | | | Case Lower | 20042517A | | | | (SET) Case Lower | 30023700A | NFB-399C SERVICE KIT | | 2 | Cover | 30020590A | | | | (SET)Cover | 30023383A | NFB-399C SERVICE KIT | | 3-1 | Main PCB | 30020431A | | | 3-2 | Terminal PCB | 30020433A | | | 4 | Front Panel | 30019786A | | | 5 | Exhaust Duct Assembly | 30020520A | | | 6 | Intake Air Duct Assembly | 30020519A | | | 7-1 | Air Filter Case | 20046047A | | | 7-2 | Air Filter | 20046201A | | | 8 | PCB Lower Bracket | 20040181A | | | 9 | Rubber Ring | 20041970A | | | 10 | 24 V Power Transformer | 30019688A | | | 11 | Heating Supply Adapter (Air Vent Adapter) | 20043267A | | | 12 | Base Packing | 20042901A | | | 13 | Drain Pan Adapter Lower Bracket | 20043583A | | | 14 | Handle | 20044467A | | | 15 | Air Pressure Sensor | 30013265A | | Appendixes 123 12.6.3 Heat Exchanger and Waterway Assembly-NFB-301C 124 Appendixes | \# | Description | Part \# | Remark | | --- | --- | --- | --- | | 1 | Heat Exchanger Assembly | 30021565A | | | | (SET) Heat Exchanger Assembly | 30023358A | NFB-301C SERVICE KIT | | 2 | Drain Pan Assembly | 30020747A | | | 3 | Supply Pipe (Upper) | 30020985A | | | 4 | Packing | 20041401A | | | 5 | Heat Exchanger Outlet Adapter | 30021367A | | | 6 | Supply Pipe (Lower) | 30020986A | | | 7 | Fastener | 20040255A | | | 8 | Supply/Return Pipe (Lower) Adapter | 20040244A | | | 9 | LWCO (Pressure sensor) | 30022672A | | | 10 | LWCO (Pressure sensor) Packing | 20006873A | | | 11 | Heat Exchanger Inlet Adapter | 30020587A | | | 12 | Return Pipe (Lower) | 30022921A | | | 13 | Thermistor | 30012907A | | | 14 | Return Pipe (Upper) | 30022922A | | | 15 | Drain Pan Packing | 20040241A | | | 16 | Exhaust Duct (Lower) | 20040242A | | | 17 | Exhaust Duct Clip | 20042741A | | | 18 | Exhaust Duct Packing (G90) | 20022326A | | | 19 | Exhaust Duct Packing (P85) | 20042823A | | | 20 | Exhaust Duct (Upper) | 20042575A | | | 21 | Exhaust Duct Cap | 20029712A | | | 22 | Exhaust Duct Packing (Upper) | 20043021A | | | 23 | Thermistor (Exhaust) | 30020489A | | | 24 | Heat Exchanger Drain Cap | 20042237A | | | 25 | High Limit Switch | 30002558A | | | 26 | O-ring (V32) | 20041403A | | | 27 | O-ring (P34) | 20042298A | | | 28 | Drain Pan Adapter | 20043016A | | | 29 | Drain Pan Adapter Packing | 20043017A | | | 30 | Screw (M4X10L) | 20038753A | | | 31 | Screw (M4X20L) | 20042814A | | | 32 | Bolt (M4X10L) | 20038757A | | Appendixes 125 12.6.4 Heat Exchanger and Waterway Assembly-NFB-399C 126 Appendixes | \# | Description | Part \# | Remark | | --- | --- | --- | --- | | 1 | Heat Exchanger Assembly

FAQs

What assemblies are covered in the component assembly diagrams?

The document covers case assemblies, heat exchanger and waterway assemblies, and combustion parts assemblies for NFB-301C and NFB-399C.

How is part information organized in the tables?

Each table lists an item number, a description, a part number, and a remark field that often indicates service kit compatibility.

What types of components are included in the heat exchanger and waterway assembly sections?

They include a heat exchanger assembly, drain pan components, supply and return pipes and adapters, thermistors, LWCO pressure sensor parts, switches, exhaust ducts, O-rings, fasteners, and related packing and caps.

Oct 26, 2026

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