Suburban Nt Series NT20SEQ Parts Diagram · Exploded View › Combustion Chamber-blower Asm

Furnace · 4 assemblies · 4 diagram sheets · 69 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT20SEQ RV furnace: 4 assemblies (Exploded View › Combustion Chamber-blower Asm, Exploded View › Cabinet Assy & Thermostat, Replacement Furnace, Exploded View › Burner Assembly) and 69 manufacturer part numbers. 13 parts are marked as superseded — the description gives the replacement number to order instead.

The rating plate is on the furnace chassis — slide the unit's front panel off or look just inside the exterior access door. Suburban models (SF-30F, NT-34SP …) changed burners and boards over the years, so the serial number's date range matters as much as the model.

Exploded View › Combustion Chamber-blower Asm

Components

28 items

1. #APPLIANCE COMPONENTS RV; BRKT SAIL SW MTG MFR # 62476
2. #Screw; Use With Suburban Furnace Part Numbers NT-16SE/ NT-20SE; # 2; 56 Inch x 5/8 Inch; Hex Head MFR # 121247 Superseded: see description
3. #Furnace Low Air Flow Switch; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE/ NT-20S/ NT-20SE; Also Use New Number 525028 MFR # 233352 Superseded: see description
4. #Furnace Low Air Flow Switch; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE/ NT-20S/ NT-20SE; Also Use New Number 233352 MFR # 233100 Superseded: see description
5. #APPLIANCE COMPONENTS RV; Nut Hex 2-56 Elastic Stop MFR # 121951
6. #COMBUSTION CHAMBER/SHIELD ASM MFR # 21234BK
7. #GROMMET MFR # 70243S
8. #LIMIT SW MFR # 233484
9. #Furnace Limit Switch; Use With NT16SEQ/ NT20SEQ Suburban Furnaces; Also Use New Number 233484 MFR # 233020 Superseded: see description
10. #GATEKING-F150 (04-14) MFR # 230714
11. #APPLIANCE COMPONENTS RV; Bushing Snap 1/2" MFR # 70270
12. #Ignition Control Circuit Board;;Replaces Dinosaurs Earlier Small And Large Fan Boards; Can Also Be MFR # DNRFAN50PLUSPINS
13. #Ignition Control Circuit Board; For Suburban Furnace Models NT-16SQT/ NT-20SQT/ NT-16SEQT/ NT-20SEQT/ NT-T Replacement Cores; With 521099 Board And Rewiring Instructions MFR # 521313
14. #Ignition Control Circuit Board - Fits Suburban Water Heaters MFR # 520820MC
15. #ignition Control Circuit Board; Replacement For Suburban Furnace SF-Series (After Serial Number 003805481); 12 Volt DC MFR # 520820
16. #ignition Control Circuit Board; Replacement For Suburban 520741 Or 520820 Boards And Fits All Suburban 12 Volt Furnaces; Will Not Replace 24 Volt AC Boards MFR # 521099
17. #Ignition Control Circuit Board; For Suburban Furnace Models With A Non-Fan Controlled Module Board: NT-16SQ/ NT-20SQ/ NT-16SEQ/ NT-20SEQ/ NT Replacement Cores/ SF-20Q/ SF-25Q/ SF-30Q/ SF-35Q/ SF-42Q/ SF-20FQ/ SF-25FQ/ SF-30FQ/ SF-35FQ/ SF-42FQ/ SFV-20Q/ SFV-25Q/ SFV-30Q/ SFV-35Q/ SFV-42Q/ SFV-20FQ/ SFV-25FQ/ SFV-30FQ/ SFV-35FQ/ SFV-42FQ/ SF-20VHQ/ SF-25VHQ/ SF-30VHQ/ SF-35VHQ/ SF-20VHFQ/ SF-25VHFQ/ SF-30VHFQ/ SF-35VHFQ/ SF Replacement Cores; Use With Time Delay Relay 521304; Also Use New Number 521313 For NT-T Series Or 521314 For SF-T Series MFR # 521303 Superseded: see description
18. #APPLIANCE COMPONENTS RV; BRKT COMB AIR HSG MFR # 62392
19. #APPLIANCE COMPONENTS RV; Gskt Burner Tunnel MFR # 70450
20. #Furnace Combustion Wheel; Replacement For Suburban NT16-SQ/ NT16-SEQ/ NT20-SQ/ NT20-SEQ Models MFR # 350208S
21. #HSG COMB AIR REAR MFR # 391059
22. #APPLIANCE COMPONENTS RV; HSG COMB AIR MFR # 391058
23. #KIT MOTOR MFR # 521068
24. #MOTOR - USE 521068 MFR # 521056 Superseded: see description
25. #IMPELLER ROOM AIR MFR # 350207
26. #BRACKET, COMBUSTION AIR HOUSING MOUNTING MFR # 63447
27. #APPLIANCE COMPONENTS RV; BRKT MTG MFR # 63262
28. #Furnace Fan Switch; For All V-Series Suburban Furnaces (After Serial Number 952202951) MFR # 232351

Exploded View › Cabinet Assy & Thermostat

Components

17 items

1. #Wall Thermostat; Single Stage; For Heat Control; Mechanical Readout; White Case MFR # 161154
2. #Wall Thermostat; Heat; Not Programmable; Mechanical Readout; Black MFR # 161210
3. #GRILLE/LABELS MFR # 031504BK
4. #FRONT,CABINET LIGHT GRAY MFR # 30785GL
5. #Furnace Access Door; For Suburban Furnace NT12SE/ NT16SE/ NT16SEQ/ NT20SE/ NT20SEQ; Polar White MFR # 030785PW
6. #FRONT,CABINET GRAY MFR # 30785SG
7. #Furnace Access Door; NT-SEQ Series; For Use With NT-SEQ Series Furnace; Polar White; Composite Plastic; With Polar White Screws MFR # 031504PW Superseded: see description
8. #CAB/LABELS MFR # 102396
9. #APPLIANCE COMPONENTS RV; BUSHING SNAP MFR # 70569
10. #TUBE INTAKE MFR # 052162
11. #Furnace Intake Tube; For Suburban Furnace NT-16SEQ/ NT-20SEQ; 2-3/4 Inch Length MFR # 052160
12. ##T5-12 TUBE 30 LED SW MFR # 50708
13. #Furnace Intake Tube; For Suburban Furnace NT-16SE/ NT-20SE; 5 Inch Length; Steel; With Gasket MFR # 50712
14. #TUBE, INTAKE & VENT CAP 7 1/4" MFR # 521077S
15. #TUBE INTAKE MFR # 052161
16. #VENT CAP/RANGE SHIELD MFR # 260572
17. #VENT CAP/RAIN SHIELD MFR # 260580

Replacement Furnace

Components

11 items

1. #RP-16 FURNACE CORE NEQ MFR # 2612A
2. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; 1 Stage; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; 22 Pounds; With Energy-Saving Solid State Electronic Ignition; Gasket Sealed Vent Assembly; With Black Composite Access Door And 7-1/4 Inch Length Intake Tube; Pack Of 10 MFR # 2506JBK
3. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; Electronic Ignition; Gasket Sealed Vent Assembly; With Black Metal Access Door; Also Use New Number 2504ABK MFR # 2446ABK Superseded: see description
4. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; 1 Stage; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; 22 Pounds; With Energy-Saving Solid State Electronic Ignition; Gasket Sealed Vent Assembly; With Polar White Composite Access Door And 5 Inch Length Intake Tube; Pack Of 10 MFR # 2504JPW
5. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19,000 BTU; Direct Discharge; 9-3/8 Inch Width x 9-1/2 Inch Height x 22-1/2 Inch Depth; 45.21 Pounds; With Automatic Direct Spark Ignition; With Polar White Metal Access Door MFR # 2446APW
6. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; 1 Stage; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; 22 Pounds; With Energy-Saving Solid State Electronic Ignition; Gasket Sealed Vent Assembly; With Polar White Composite Access Door And 7-1/4 Inch Length Intake Tube; Pack Of 10 MFR # 2506JPW
7. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; 1 Stage; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; 22 Pounds; With Energy-Saving Solid State Electronic Ignition; Gasket Sealed Vent Assembly; With Black Metal Access Door; Pack Of 10 MFR # 2501JBK
8. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; 1 Stage; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; 22 Pounds; With Energy-Saving Solid State Electronic Ignition; Gasket Sealed Vent Assembly; With Polar White Metal Access Door; Pack Of 10 MFR # 2501JPW
9. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; Electronic Ignition; Gasket Sealed Vent Assembly; With White Composite Access Door MFR # 2504APW
10. #NT20SEQ FURNACE MFR # 2504ABK
11. #Furnace; NT-SEQ Series; LP Gas; Model Number NT-20SEQ; 19000 BTU; 1 Stage; Optional Side Duct; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/8 Inch Depth; 22 Pounds; With Energy-Saving Solid State Electronic Ignition; Gasket Sealed Vent Assembly; With Black Composite Access Door And 5 Inch Length Intake Tube; Pack Of 10 MFR # 2504JBK

Exploded View › Burner Assembly

Components

13 items

1. #Furnace Burner Orifice; For Suburban Furnace NT12LEC/ NT16LEC/ NT20LEC/ NT20S/ NT16LE/ NT16S/ NT20L/ NT20SE/ NT20SQ/ NT20SEQ MFR # 180231
2. #Igniter Electrode; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE (After Serial Number 000303844); Without Gasket; Also Use New Number 525033 MFR # 231931 Superseded: see description
3. #Igniter Electrode; For Suburban Furnace Models NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE (After Serial Number 000303844); Without Gasket MFR # 231931MC
4. #Furnace Gasket; Furnace Burner Access Door Gasket And Electrode Gasket; Fits Suburban Furnace NT-12/ NT-16/ NT-20/ NT-12S/ NT-16S/ NT-20S/ NT-12SP/ NT-16SP/ NT-20SP/ NT-24/ NT-30/ NT-34/ NT-24M/ NT-30M/ NT-34M/ NT-24S/ NT-30S/ NT-34S/ NT-24SP/ NT-30SP/ NT-34SP/ NT-40/ P-30/ P-40; Also Use New Number 525011 MFR # 71076 Superseded: see description
5. #GASKET, PILOT BURNER USE 71076 MFR # 70163 Superseded: see description
6. #Furnace Burner; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE; 0.57 Pound MFR # 10978S
7. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
8. #Water Heater Gas Inlet Elbow; For Suburban Water Heater SW4-D; 90 Degree; 3/8 Inch; Single MFR # 525025
9. #Water Heater Gas Inlet Elbow; For Suburban Water Heater SW4-D; 90 Degree; Also Use New Number 525025 MFR # 170374 Superseded: see description
10. #SUBURBAN VALVE MFR # 161123
11. #APPLIANCE COMPONENTS RV; BRKT MANIFOLD MTG MFR # 63531
12. #Furnace Manifold; For Suburban NT-16SE/ NT-20SE/ NT-16SEQ/ NT-20SEQ/ NT-16SQ/ NT-20SQ Furnaces MFR # 171786
13. #Furnace Gasket; Furnace Manifold Gasket; Fits Suburban Furnace NT-12S/ NT-16S/ NT-16SE/ NT-16SQ/ NT-20S/ NT-20SE/ NT-20SQ MFR # 70449