Suburban Nt Series NT12L Parts Diagram · Exploded View › Burner Assembly

Furnace · 4 assemblies · 8 diagram sheets · 110 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT12L RV furnace: 4 assemblies (Exploded View › Burner Assembly, Exploded View › Cabinet Assembly, Exploded View › Combustion Chamber, Replacement) and 110 manufacturer part numbers. 20 parts are marked as superseded — the description gives the replacement number to order instead.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 › Burner Assembly

Components

37 items

1. #STRAP, GROUND MFR # 230173
2. #APPLIANCE COMPONENTS RV;;Screw 8-32 X 3/8 Hex Hd MFR # S6U121407
3. #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NT-34M/ NT-24S/ NT-30S/ NT-34S/ NT-24SP/ NT-30SP/ NT-34SP/ NT-40/ P-30/ P-40; Also Use New Number 525011 MFR # 71076 Superseded: see description
4. #GASKET, PILOT BURNER USE 71076 MFR # 70163 Superseded: see description
5. #5 WIRE FLAT VEHICLE END MFR # 30485
6. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
7. #Furnace Access Door Sight Glass; Replacement For Suburban Furnace NT-Series/ P-45M/ P-45S MFR # 310026
8. #APPLIANCE COMPONENTS RV; Cover Plate MFR # 290120
9. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
10. #REPLMT METAL SOCKET MFR # 10595
11. #APPLIANCE COMPONENTS RV; Orifice #60 MFR # 180225
12. #MANIFOLD, GAS INLET MFR # 170779
13. #FITTING MFR # 170527
14. #Furnace Gasket; Furnace Manifold Gasket; Fits Suburban Furnace NT-12S/ NT-16S/ NT-16SE/ NT-16SQ/ NT-20S/ NT-20SE/ NT-20SQ MFR # 70449
15. #AWNING, 8' SIDEWINDER II WHT W/WHITE HARDWARE MFR # 170800
16. #VALVE,GAS USE 520423 W/MANIFOLD MFR # 160781 Superseded: see description
17. #Propane Adapter Fitting; Fits Suburban Part Numbers 171171/ 171172/ 171325/ 171326/ 171334/ 171406/ 171407/ 171443/ 171444/ 171445/ 211497/ 520423 MFR # 170545
18. #VALVE,GAS MFR # 160911
19. #VALVE,GAS USE 161078 MFR # 160832 Superseded: see description
20. #VALVE, FENWAL MFR # 160803
21. #SUBURBAN VALVE MFR # 161123
22. #VALVE KIT USE 160911 & 170545 MFR # 520423 Superseded: see description
23. #VALVE, GAS USE 161123 MFR # 161078 Superseded: see description
24. #COUPLING MFR # 170522
25. #VALVE, MANUAL SHUT OFF MFR # 160782
26. #ROD, SHUT-OFF VALVE MFR # 140153
27. #KNOB, SHUT-OFF VALVE MFR # 140151
28. #COTTER PIN MFR # 121352
29. #Furnace Time Delay Relay; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE/ NT-25/ NT-30/ NT-35/ SF-20/ SF-25/ SF-30/ SF-35/ SF-42/ SF-20F/ SF-25F/ SF-30F/ SF-35F/ SF-42F/ NT-24S/ NT-30S/ NT-34S/ NT-24SP/ NT-30SP/ NT-34SP/ NT-40 (NT24/30/34 S And SP Only Above Serial Number 1600851); 12 Volt MFR # 521069
30. #Furnace Time Delay Relay; Replacement For Older Furnaces That Use A Standard 12 Volt DC Igniter Board; Micro Controlled; 12 Volt DC; 1-1/2 Inch x 1-1/2 Inch; 4 Second Delay; 2 Minute Cool Down Period At The End Of The Heat Cycle; Also Use New Number 12VDCTDR MFR # 48000D Superseded: see description
31. #WIRE, IGNITION USE 318060002 MFR # 230350 Superseded: see description
32. #Furnace Time Delay Relay; Use With Suburban Furnace Models NT-24-S/ NT-24-SP/ NT-30-S/ NT-30-SP/ NT-34-S/ NT-40/ P-30-S/ P-40-S; 24 Volt MFR # 231202MC Superseded: see description
33. #WIRE,HIGH VOLTAGE USE 231713 MFR # 318060002 Superseded: see description
34. #IGNITOR BOARDS AND ACCESS MFR # 12VDCTDR
35. #APPLIANCE COMPONENTS RV; Wire Electrode - N.L.A. MFR # 231713
36. #MANIFOLD ASSY. COMPLETE WITH VALVE KIT NT-12L MFR # 170638
37. #APPLIANCE COMPONENTS RV; Relay Switch MFR # 231202

Exploded View › Cabinet Assembly

Components

25 items

1. #FRONT, CABINET MFR # 100889
2. #CABINET ASSY MFR # 100890
3. #LATCH,CABINET FRONT NT24 M MFR # 62230
4. #KNOB MFR # 140149
5. #NUT,TINNERMAN 1/4 X 1/4 MFR # 121395
6. #APPLIANCE COMPONENTS RV;;Collar Duct MFR # 50296
7. #APPLIANCE COMPONENTS RV; Screw 10 X 3/4 Ph Ph MFR # 121224
8. #APPLIANCE COMPONENTS RV; BUSHING UNIV MFR # 70486
9. #NR61633030 MOUNTING MFR # 50605
10. #NR616319BWH WHITE BASE MFR # 50603
11. ##T5-12 TUBE 30 LED SW MFR # 50708
12. #TUBE INTAKE MFR # 052162
13. #APPLIANCE COMPONENTS RV; Tube Exh Int MFR # 50454
14. #VENT CAP/RANGE SHIELD MFR # 260572
15. #Furnace Vent; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE/ NT-20S/ NT-20SE; Exhaust Vent Cap; With Vent Extension Tube MFR # 260098
16. #Screw; For Suburban Furnace Exhaust Vent; 8 X 3-1/4; Set Of 2 MFR # 121711
17. #APPLIANCE COMPONENTS RV; Thermostat 3 Day Program MFR # 1F80R850
18. #Wall Thermostat; Single Stage; For Heat And Cool Control; Programmable; Digital Display; 24 Volt; Battery Powered MFR # 1F87R875
19. #Wall Thermostat; Single Stage; Snap-Action; Low Voltage; Heat Only; 24 Volt; White MFR # 01C20102S1
20. #T-STAT USE 100402 MFR # 160814 Superseded: see description
21. #Wall Thermostat; Single Stage; For Heat/ Cool Control; Mechanical Readout; 12 Volt; Without Fan Speed Control; Without Fan On Mode MFR # 100402
22. #Wall Thermostat; Heat Only; Mechanical; 1 Stage; White; MFR # 1C20101
23. #T-STAT,WALL USE 100402 MFR # 60A140003 Superseded: see description
24. #Furnace Duct Cover Plate; Fits Suburban 4 Inch Duct MFR # 50733
25. #CABINET FRONT ASM. (INCL. 1, 3, 3A, 4) MFR # 100926

Exploded View › Combustion Chamber

Components

54 items

1. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
2. #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
3. #SCREW MFR # 121451
4. #APPLIANCE COMPONENTS RV; Switch Sail MFR # 230619
5. #APPLIANCE COMPONENTS RV; Sail Switch MFR # 230933
6. #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
7. #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
8. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
9. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
10. #CHAMBER MFR # 20839
11. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
12. #COVER, CONTROL BOX MFR # 110372
13. #ELBOW 90 DEGREE 1" MFR # 70466
14. #RADIATION SHIELD BACKWALL ASSY MFR # 110373
15. #GROMMET MFR # 90432
16. #APPLIANCE COMPONENTS RV; BRKT HSG COMB AIR MTG MFR # 62290
17. #Furnace Room Air Impeller; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE MFR # 350083
18. #APPLIANCE COMPONENTS RV; Motor MFR # 232877
19. #Furnace Motor Mounting Grommet; Replacement For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Rubber MFR # 530089
20. #MOTOR USE 232877 MFR # 230616 Superseded: see description
21. #APPLIANCE COMPONENTS RV; Nut 10-32 Hex Lock MFR # 120716
22. #APPLIANCE COMPONENTS RV; Washer Flat 7/32Idx1/2Od MFR # 120684
23. #Furnace Motor; For Suburban Furnace NT-12S/ NT-12SE/ NT12-LE/ NT-16LE/ NT-16SE (Below Serial Number 000303844) MFR # 520949
24. #Furnace Gasket; Furnace Motor Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70448
25. #Furnace Combustion Air Housing; Replacement For Suburban NT12/ NT16/ NT20 Series Furnaces MFR # 390223
26. #APPLIANCE COMPONENTS RV; BRKT COMB AIR HSG MFR # 62392
27. #Furnace Combustion Air Housing Cover; For Suburban Furnace NT-12/ NT-16/ NT-20 Series MFR # 390222BK
28. #NO PART # GIVEN BY VENDOR MFR # NPG
29. #BOX,COMBUSTION AIR USE 390222BK MFR # 390222 Superseded: see description
30. #Furnace Gasket; Furnace Combustion Air Box Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70446
31. #Furnace Combustion Wheel; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE/ NT-20S/ NT-20SE MFR # 350082
32. #APPLIANCE COMPONENTS RV; Gskt Burner Tunnel MFR # 70450
33. #Furnace Time Delay Relay; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE/ NT-25/ NT-30/ NT-35/ SF-20/ SF-25/ SF-30/ SF-35/ SF-42/ SF-20F/ SF-25F/ SF-30F/ SF-35F/ SF-42F/ NT-24S/ NT-30S/ NT-34S/ NT-24SP/ NT-30SP/ NT-34SP/ NT-40 (NT24/30/34 S And SP Only Above Serial Number 1600851); 12 Volt MFR # 521069
34. #APPLIANCE COMPONENTS RV; Screw 6 X 5/8 Ph Ph MFR # 121357
35. #APPLIANCE COMPONENTS RV; Relay MFR # 230625
36. #UNIVERSAL IGN BRD LARGE MFR # UIBL
37. #ignition Control Circuit Board; For Suburban Furnace SF Series/ NT Series And All Water Heater DSI Series/ SW Series/ VDSI Series; Also Use New Number 521099 For Furnaces Or 520814 For Water Heaters MFR # 520741 Superseded: see description
38. #UNIVERSAL IGN BRD SMALL MFR # UIBS
39. #Ignition Control Circuit Board Cover; Replacement For Dinosaurs Universal Igniter Boards; Large; White; Fire Retardant ABS Plastic MFR # LCVR
40. #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
41. #UIB WITH FAN CONTROL MFR # FAN50PLUS
42. #UIB S WITH POST TOP MFR # UIBSPOST
43. #UIB L WITH POST TOP MFR # UIBLPOST
44. #Furnace Wiring Harness; For Suburban Furnace DD17DSI/ NT-Series MFR # 232161
45. #COVER FOR UIB S MFR # SMALLCOVER
46. #Furnace Limit Switch; For Suburban Furnace NT-12/ NT-16/ NT-20/ NT-12S/ NT-16S/ NT-20S MFR # 230621
47. #LIMIT SW MFR # 233484
48. #SCREW #6 x 1/4 (2 REQ.) MFR # 120714
49. #GATEKING-F150 (04-14) MFR # 230714
50. #Furnace Time Delay Relay; Replacement For Older Furnaces That Use A Standard 12 Volt DC Igniter Board; Micro Controlled; 12 Volt DC; 1-1/2 Inch x 1-1/2 Inch; 4 Second Delay; 2 Minute Cool Down Period At The End Of The Heat Cycle; Also Use New Number 12VDCTDR MFR # 48000D Superseded: see description
51. #IGNITOR BOARDS AND ACCESS MFR # 12VDCTDR
52. #PLUG BUTTON MFR # 70438
53. #Furnace Time Delay Relay; Use With Suburban Furnace Models NT-24-S/ NT-24-SP/ NT-30-S/ NT-30-SP/ NT-34-S/ NT-40/ P-30-S/ P-40-S; 24 Volt MFR # 231202MC Superseded: see description
54. #APPLIANCE COMPONENTS RV; Relay Switch MFR # 231202

Replacement

Components

2 items

1. #USE 79-1806 MFR # NT12SN Superseded: see description
2. #USE 79-1814 MFR # NT12SEN Superseded: see description