Suburban Nt Series NT20T Parts Diagram · Replacement Furnace

Furnace · 4 assemblies · 4 diagram sheets · 109 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT20T RV furnace: 4 assemblies (Replacement Furnace, Exploded View › Cabinet Assembly, Exploded View › Combustion Chamber, Exploded View › Burner Assembly) and 109 manufacturer part numbers. 28 parts are marked as superseded — the description gives the replacement number to order instead.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 # 2021APW
2. #UNIV LDR BAR CROSSMEMB MFR # 2019

Exploded View › Cabinet Assembly

Components

18 items

1. #Furnace Cabinet; Replacement Cabinet For Suburban Furnace N30M/ NT-20T/ NT-24MA/ NT-24MP/ NT-24MPD/ NT-24S/ NT-24SP/ NT-34MA/ NT-30MP/ NT-30MPD/ NT-30S/ NT-30SP/ NT-34L/ NT-34LD/ NT-34S/ NT-34SP MFR # 101874
2. #Furnace Cabinet Panel Mounting Clip; For Suburban Furnace NT30S/ NT24S/ NT34S/ NT20T/ P40/ P40S MFR # 121378
3. #Furnace Gasket; Furnace Bottom Duct Adapter Gasket; Fits Suburban Furnace NT-24/ NT-30/ NT-34S/ NT-24/ NT-30SP/ NT-25/ NT-30/ NT-35K/ NT-24/ NT-30/ NT-34HS/ P-30S MFR # 62164
4. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
5. #Furnace Adapter Plate; For Suburban Furnace NT-30SP MFR # 101871DG
6. #FRONT,CABINET GRAY ***SEE NOTES FOR USE #'S MFR # 100808 Superseded: see description
7. #APPLIANCE COMPONENTS RV; Screw 10 X 3/4 Ph Ph MFR # 121224
8. #NR627947 RETAINER-PANEL-12 UPR-BLK MFR # 50715
9. #Wall Thermostat; Single Stage; For Heat/ Cool Control; Mechanical Readout; 12 Volt; Without Fan Speed Control; Without Fan On Mode MFR # 100402
10. #Wall Thermostat; Heat Only; Mechanical; 1 Stage; White; MFR # 1C20101
11. #Wall Thermostat; Single Stage; For Heat And Cool Control; Programmable; Digital Display; 24 Volt; Battery Powered MFR # 1F87R875
12. #T-STAT USE 161154 MFR # 160912 Superseded: see description
13. #Wall Thermostat; Single Stage; For Heat Control; Mechanical Readout; White Case MFR # 161154
14. #Wall Thermostat; Heat; Not Programmable; Mechanical Readout; Black MFR # 161210
15. #Wall Thermostat; Single Stage; Snap-Action; Low Voltage; Heat Only; 24 Volt; White MFR # 01C20102S1
16. #APPLIANCE COMPONENTS RV; Thermostat 3 Day Program MFR # 1F80R850
17. #Furnace Duct Cover Plate; Fits Suburban 4 Inch Duct MFR # 50733
18. #32646 BUG BUST BI-LING 32OZ MFR # 50558

Exploded View › Combustion Chamber

Components

67 items

1. #APPLIANCE COMPONENTS RV; Screw 8-32 X 3/8 Hex Hd MFR # 121407
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 NT-24M/ NT-30M/ NT-34M; Without Gasket MFR # 520733
4. #APPLIANCE COMPONENTS RV; Wire Electrode - N.L.A. MFR # 231713
5. #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
6. #APPLIANCE COMPONENTS RV; Ignitor Wire MFR # 230949
7. #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
8. #WIRE,HIGH VOLTAGE USE 231713 MFR # 318060002 Superseded: see description
9. #Igniter Electrode; For Suburban Furnace Models NT-24M/ NT-30M/ NT-34M; Without Gasket MFR # 520733MC
10. #APPLIANCE COMPONENTS RV; Nut 10-24 Hex Lock (Std) MFR # 121421
11. #SCREW MFR # 30523C
12. #DOOR BURNER - NLA MFR # 30523
13. #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
14. #GASKET, PILOT BURNER USE 71076 MFR # 70163 Superseded: see description
15. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
16. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
17. #Furnace Access Door Sight Glass; Replacement For Suburban Furnace NT-Series/ P-45M/ P-45S MFR # 310026
18. #APPLIANCE COMPONENTS RV; Cover Plate MFR # 290120
19. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
20. #CHAMBER,COMB. USE 20932S MFR # 20931 Superseded: see description
21. #APPLIANCE COMPONENTS RV; Suburban Heat Chamber MFR # 20932S
22. #CHAMBER MFR # 20925
23. #SWITCH,LIMIT USE 230496 MFR # 230773 Superseded: see description
24. #Furnace Limit Switch; For Suburban Furnace NT-30SP/ NT-34SP/ NT-24/ NT-30/ NT-34/ NT-24M/ NT-30M/ NT-34M/ NT-24S/ NT-30S/ NT-34S/ P-30S; Also Use New Number 525020 MFR # 231244 Superseded: see description
25. #Furnace Limit Switch; For Suburban Furnace P-30S/ NT-34SP/ NT-24/ NT-30/ NT-34/ NT-24M/ NT-30M/ NT-34M/ NT-24S/ NT-30S/ NT-34S MFR # 230496
26. #SWITCH,LIMIT MFR # 232578
27. #Furnace Limit Switch; For Suburban Furnace Models P-30S/ NT-34SP/ NT-24/ NT-30/ NT-34/ NT-24M/ NT-30M/ NT-34M/ NT-24S/ NT-30S/ NT-34S MFR # 230496MC
28. #Screw; For Suburban Furnace NT-Series; Fits Suburban Furnace Combustion Chamber; #10 x 3/8 Inch MFR # 121252
29. #APPLIANCE COMPONENTS RV; Bushing MFR # 70362
30. #GATEKING-F150 (04-14) MFR # 230714
31. #SCREW #6 x 1/4 (2 REQ.) MFR # 120714
32. #APPLIANCE COMPONENTS RV; Bushing Snap 1/2" MFR # 70270
33. #WATER FLANGE WHIT PLASTC MFR # 62135
34. #UNIVERSAL IGN BRD SMALL MFR # UIBS
35. #UIB L WITH POST TOP MFR # UIBLPOST
36. #UIB WITH FAN CONTROL MFR # FAN50PLUS
37. #UIB S WITH POST TOP MFR # UIBSPOST
38. #Furnace Wiring Harness; For Suburban Furnace DD17DSI/ NT-Series MFR # 232161
39. #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
40. #BOARD,MODULE USE 520741 (05152435103) MFR # 230587 Superseded: see description
41. #UNIVERSAL IGN BRD LARGE MFR # UIBL
42. #COVER FOR UIB S MFR # SMALLCOVER
43. #Ignition Control Circuit Board Cover; Replacement For Dinosaurs Universal Igniter Boards; Large; White; Fire Retardant ABS Plastic MFR # LCVR
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. #APPLIANCE COMPONENTS RV; Screw 6 X 5/8 Ph Ph MFR # 121357
46. #CAP LUG #1-3/8 RED INSULATOR CAP F/ CIR BD MFR # 70549
47. #BURNER, LARGE W/AIR SHUTTER USE 520564 MFR # 3000003 Superseded: see description
48. #APPLIANCE COMPONENTS RV; Insulation MFR # 70538
49. #BOARD,CHANNEL USE 520741 MFR # 231328 Superseded: see description
50. #APPLIANCE COMPONENTS RV; Panel Mod Board MFR # 90301
51. #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
52. #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
53. #IGNITOR BOARDS AND ACCESS MFR # 12VDCTDR
54. #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
55. #APPLIANCE COMPONENTS RV; Relay Switch MFR # 231202
56. #***USE 79-8142*** MFR # 260164 Superseded: see description
57. #VENT CAP USE 79-8143 MFR # 260542 Superseded: see description
58. #VENT,EXHAUST TUBE USE 260164 ALSO NEED 50454 INTK TUBE MFR # 260111 Superseded: see description
59. #Furnace Intake Tube; For Suburban Furnace NT12S/ NT-16S/ NT-20S/ NT-16SQ/ NT-20SQ/ NT-30SP/ NT-34SP; 3 Inch Length; With Gasket MFR # 50906
60. #Furnace Intake Tube; For Suburban Furnace NT12S/ NT-16S/ NT-20S/ NT-16SQ/ NT-20SQ/ NT-30SP/ NT-34SP; 3 Inch Length MFR # 052159
61. #Furnace Gas Valve; For Suburban NT20T/ NT24S/ NT30S/ NT34S Series Furnaces; 110 Series; 3/8 Inch Inlet x 3/8 Inch Outlet; 160 Degrees MFR # 110504
62. #SHIELD,RADIATION MFR # 110504S
63. #APPLIANCE COMPONENTS RV; Screw 10 X 3/4 Ph Ph MFR # 121224
64. #Screw; For Suburban Furnace Exhaust Vent; 8 X 3-1/4; Set Of 2 MFR # 121711
65. #SCREW,8 X 3 1/4 USE 121711 MFR # 121256 Superseded: see description
66. #APPLIANCE COMPONENTS RV; Screw 10-24X1/2 Whiz Lock MFR # 121459
67. #Furnace Vent Adapter; Replacement For Suburban Furnace NT-20T/ NT24S/ NT24SP/ NT-30M/ NT-30S/ NT-30SP/ NT-34S/ NT-34SP/ P-30S MFR # 260089

Exploded View › Burner Assembly

Components

26 items

1. #WHEEL,ROOM AIR USE 350113 MFR # 350076 Superseded: see description
2. #Furnace Blower Wheel; For Suburban Furnace NT-30SP/ NT-34SP MFR # 350113
3. #Screw; For Suburban Furnace NT-Series; Fits Suburban Furnace Combustion Chamber; #10 x 3/8 Inch MFR # 121252
4. #Furnace Blower Housing; Furnace Blower Wheel Housing; For Suburban Furnace NT30SP/ NT34SP MFR # 390283
5. #Screw; Use With Suburban Furnace Model NT40; Phillips Head; 10-24 x 1/2 MFR # 121227 Superseded: see description
6. #Furnace Low Air Flow Switch; For Suburban Furnace Models NT-30/ NT-34/ NT-30M/ NT-34M/ NT-30S/ NT-34S/ NT-30SP/ NT-34SP/ NT-25/ NT-30/ NT-35/ NT-35K/ P-30S/ SF-20/ SF-25/ SF-30/ SF-35/ SF-20F/ SF-25F/ SF-30F/ SF-35F MFR # 230509MC
7. #Furnace Low Air Flow Switch; For Suburban Furnace NT-40 MFR # 233355
8. #Furnace Low Air Flow Switch; For Suburban Furnace NT-30/ NT-34/ NT-30M/ NT-34M/ NT-30S/ NT-34S/ NT-30SP/ NT-34SP/ NT-25/ NT-30/ NT-35/ NT-35K/ P-30S/ SF-20/ SF-25/ SF-30/ SF-35/ SF-20F/ SF-25F/ SF-30F/ SF-35F; Also Use New Number 525024 MFR # 233356 Superseded: see description
9. #Furnace Low Air Flow Switch; For Suburban Furnace NT-40; Also Use New Number 233355 MFR # 232279 Superseded: see description
10. #Furnace Low Air Flow Switch; For Suburban Furnace NT-30/ NT-34/ NT-30M/ NT-34M/ NT-30S/ NT-34S/ NT-30SP/ NT-34SP/ NT-25/ NT-30/ NT-35/ NT-35K/ P-30S/ SF-20/ SF-25/ SF-30/ SF-35/ SF-20F/ SF-25F/ SF-30F/ SF-35F; Also Use New Number 233356 MFR # 230509 Superseded: see description
11. #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
12. #APPLIANCE COMPONENTS RV; Washer Lock #2 MFR # 121364
13. #NUT HEX 2-56 MFR # 120672
14. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
15. #Furnace Motor Bracket; For Suburban NT-40 MFR # 62138
16. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
17. #Furnace Gasket; Furnace Crossover Tube Gasket; Fits Suburban Furnace NT-24M/ NT-30M/ NT-30SP/ NT-34SP/ NT-40 MFR # 70385
18. #Furnace Motor; For Suburban Furnace Models NT-24 M/ NT-24S/ NT-24SP MFR # 231206MC
19. #Furnace Motor; For Suburban Furnace NT-24 M/ NT-24S/ NT-24SP MFR # 231206
20. #Furnace Gasket; Motor Mount Gasket; Fits Suburban Furnace NT-40 MFR # 70384
21. #APPLIANCE COMPONENTS RV; Suburban Comb Air Housing MFR # 390179
22. #APPLIANCE COMPONENTS RV; Screw #10-16 X 1/2 MFR # 121436
23. #APPLIANCE COMPONENTS RV; Wheel Blower Small 6-1/4 MFR # 350069
24. #Furnace Gasket; Furnace Combustion Air Housing Gasket; Fits Suburban Furnace NT-24/ NT-30/ NT-34H/ NT-HA/ NT-34S/ NT-30SP/ NT-34HS/ NT-30MA/ NT-34L/ NT-34MM/ P-30S/ P-40S/ NT-42S/ NT-42ST MFR # 70386
25. #HOUSING,AIR USE 390424 MFR # 390240 Superseded: see description
26. #Furnace Combustion Air Housing Cover; For Suburban Furnace NT30SP/ NT34SP/ NT40 MFR # 390424