Suburban Nt Series NT20L Parts Diagram · Replacement Furnace

Furnace · 4 assemblies · 4 diagram sheets · 106 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT20L RV furnace: 4 assemblies (Replacement Furnace, Exploded View › Burner Assembly, Exploded View › Cabinet Assembly, Exploded View › Combustion Chamber) and 106 manufacturer part numbers. 20 parts are marked as superseded — the description gives the replacement number to order instead.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.

Replacement Furnace

Components

2 items

1. #HEATERS & FURNACES RV; Nt-20Seq 19 000 Suburban MFR # NT20SEN
2. #HEATERS & FURNACES RV; Nt-20Sq 19 000 Suburban H MFR # NT20SN

Exploded View › Burner Assembly

Components

39 items

1. #APPLIANCE COMPONENTS RV; Wire Electrode - N.L.A. MFR # 231713
2. #Furnace Wiring Harness; Use With All Suburban Model NT And P Series Electrode Furnaces; 22 Inch Length MFR # 231261 Superseded: see description
3. #Igniter Electrode; For Suburban Furnace Models P-30S/ P-40S/ NT-30/ NT-34/ NT-24/ NT-30/ NT-34/ NT-24/ NT-30S/ NT-34S/ NT-24S/ NT-34S/ NT-30SP/ NT-34SP/ NT-24SP/ NT-30SP/ NT-34SP; Without Gasket MFR # 230956mc
4. #WIRE,HIGH VOLTAGE USE 231713 MFR # 318060002 Superseded: see description
5. #STRAP, GROUND MFR # 230173
6. #ELECTRODE ***USE 79-8627*** MFR # 230562 Superseded: see description
7. #APPLIANCE COMPONENTS RV; Ignitor Wire MFR # 230949
8. #APPLIANCE COMPONENTS RV; Screw 8-32 X 3/8 Hex Hd MFR # 121407
9. #Igniter Electrode; For Suburban Furnace P-30S/ P-40S/ NT-30/ NT-34/ NT-24/ NT-30/ NT-34/ NT-24/ NT-30S/ NT-34S/ NT-24S/ NT-34S/ NT-30SP/ NT-34SP/ NT-24SP/ NT-30SP/ NT-34SP; Without Gasket; Also Use New Number 525019 MFR # 230956 Superseded: see description
10. #GASKET, PILOT BURNER USE 71076 MFR # 70163 Superseded: see description
11. #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NT-34M/ NT-24S/ NT-30S/ NT-34S/ NT-24SP/ NT-30SP/ NT-34SP/ NT-40/ P-30/ P-40; Also Use New Number 525011 MFR # 71076 Superseded: see description
12. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
13. #BURNER, DOOR NT20LE MFR # 30518
14. #Furnace Access Door Sight Glass; Replacement For Suburban Furnace NT-Series/ P-45M/ P-45S MFR # 310026
15. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
16. #APPLIANCE COMPONENTS RV; Cover Plate MFR # 290120
17. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
18. #BURNER ASSEMBLY MFR # 010978
19. #NO PART # GIVEN BY VENDOR MFR # NPG
20. #BURNER ASSEMBLY USE 10978S MFR # 10614 Superseded: see description
21. #Furnace Burner Orifice; For Suburban Furnace NT12LEC/ NT16LEC/ NT20LEC/ NT20S/ NT16LE/ NT16S/ NT20L/ NT20SE/ NT20SQ/ NT20SEQ MFR # 180231
22. #MANIFOLD, GAS INLET MFR # 170799
23. #FITTING MFR # 170527
24. #Furnace Gasket; Furnace Manifold Gasket; Fits Suburban Furnace NT-12S/ NT-16S/ NT-16SE/ NT-16SQ/ NT-20S/ NT-20SE/ NT-20SQ MFR # 70449
25. #MANIFOLD ASSEMBLY WITH ORIFICE MFR # 170802
26. #SUBURBAN VALVE MFR # 161123
27. #VALVE,GAS USE 161078 MFR # 160832 Superseded: see description
28. #VALVE, GAS USE 161123 MFR # 161078 Superseded: see description
29. #COUPLING MFR # 170522
30. #SHUT-OFF VALVE MFR # 160872
31. #ROD, SHUT-OFF VALVE MFR # 140153
32. #KNOB, SHUT-OFF VALVE MFR # 140151
33. #COTTER PIN MFR # 121352
34. #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
35. #IGNITOR BOARDS AND ACCESS MFR # 12VDCTDR
36. #WIRE, IGNITION USE 318060002 MFR # 230350 Superseded: see description
37. #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
38. #APPLIANCE COMPONENTS RV; Relay Switch MFR # 231202
39. #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

Exploded View › Cabinet Assembly

Components

22 items

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

Exploded View › Combustion Chamber

Components

49 items

1. #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
2. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
3. #SCREW MFR # 121451
4. #NO GENERIC NAME;;SAIL SWITCH MFR # S6U233352
5. #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
6. #APPLIANCE COMPONENTS RV; Sail Switch MFR # 230933
7. #APPLIANCE COMPONENTS RV;;Sail Sw MFR # S6U230638
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. #RADIATION SHIELD BACKWALL ASSY MFR # 110373
12. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
13. #COVER, CONTROL BOX MFR # 110372
14. #GROMMET MFR # 90432
15. #ELBOW 90 DEGREE 1" MFR # 70466
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. #Furnace Motor Mounting Grommet; Replacement For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Rubber MFR # 530089
19. #APPLIANCE COMPONENTS RV; Motor MFR # 232878
20. #MOTOR USE 232878 MFR # 230634 Superseded: see description
21. #APPLIANCE COMPONENTS RV; Washer Flat 7/32Idx1/2Od MFR # 120684
22. #APPLIANCE COMPONENTS RV; Nut 10-32 Hex Lock MFR # 120716
23. #Furnace Gasket; Furnace Motor Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70448
24. #BOX COMB AIR MFR # S6U390223BK
25. #APPLIANCE COMPONENTS RV; BRKT COMB AIR HSG MFR # 62392
26. #BOX,COMBUSTION AIR USE 390222BK MFR # 390222 Superseded: see description
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. #Furnace Gasket; Furnace Combustion Air Box Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70446
30. #Furnace Combustion Wheel; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE/ NT-20S/ NT-20SE MFR # 350082
31. #APPLIANCE COMPONENTS RV; Gskt Burner Tunnel MFR # 70450
32. #APPLIANCE COMPONENTS RV; Relay MFR # 230625
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. #UNIVERSAL IGN BRD SMALL MFR # UIBS
36. #UIB L WITH POST TOP MFR # UIBLPOST
37. #UIB WITH FAN CONTROL MFR # FAN50PLUS
38. #Furnace Wiring Harness; For Suburban Furnace DD17DSI/ NT-Series MFR # 232161
39. #Ignition Control Circuit Board Cover; Replacement For Dinosaurs Universal Igniter Boards; Large; White; Fire Retardant ABS Plastic MFR # LCVR
40. #UIB S WITH POST TOP MFR # UIBSPOST
41. #UNIVERSAL IGN BRD LARGE MFR # UIBL
42. #BOARD,MODULE USE 520741 (05152435103) MFR # 230587 Superseded: see description
43. #COVER FOR UIB S MFR # SMALLCOVER
44. #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
45. #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
46. #32646 BUG BUST BI-LING 32OZ MFR # 50558
47. #LIMIT SWITCH MFR # S6U230815
48. #GATEKING-F150 (04-14) MFR # 230714
49. #SCREW #6 x 1/4 (2 REQ.) MFR # 120714