Suburban Nt Series NT20SE Parts Diagram · Exploded View › Burner Assembly

Furnace · 4 assemblies · 4 diagram sheets · 98 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT20SE RV furnace: 4 assemblies (Exploded View › Burner Assembly, Exploded View › Heat Chamber Assembly, Replacement Furnace, Exploded View › Cabinet Assy & Thermostat) and 98 manufacturer part numbers. 16 parts are marked as superseded — the description gives the replacement number to order instead.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

23 items

1. #APPLIANCE COMPONENTS RV; Screw 8-32 X 3/8 Hex Hd MFR # 121407
2. #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
3. #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NT-12SE/ NT-16SE/ NT-20SE (After Serial Number 000303844); Without Gasket; Also Use New Number 525033 MFR # 231931 Superseded: see description
4. #APPLIANCE COMPONENTS RV; Electrode MFR # 520775
5. #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NT-34M/ NT-24S/ NT-30S/ NT-34S/ NT-24SP/ NT-30SP/ NT-34SP/ NT-40/ P-30/ P-40; Also Use New Number 525011 MFR # 71076 Superseded: see description
6. #GASKET, PILOT BURNER USE 71076 MFR # 70163 Superseded: see description
7. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
8. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
9. #Ignition Control Circuit Board; Replacement For Atwood AFL Model Hydroflame Model Furnace; DSI Board; AC MFR # 30621
10. #Furnace Burner; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE; 0.57 Pound MFR # 10978S
11. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
12. #Water Heater Gas Inlet Elbow; For Suburban Water Heater SW4-D; 90 Degree; Also Use New Number 525025 MFR # 170374 Superseded: see description
13. #Water Heater Gas Inlet Elbow; For Suburban Water Heater SW4-D; 90 Degree; 3/8 Inch; Single MFR # 525025
14. #SUBURBAN VALVE MFR # 161123
15. #BRAKET, MANIFOLD MFR # 62288
16. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
17. #APPLIANCE COMPONENTS RV; Suburban Manifold MFR # 170744
18. #Furnace Manifold; For Suburban NT-16SE/ NT-20SE/ NT-16SEQ/ NT-20SEQ/ NT-16SQ/ NT-20SQ Furnaces MFR # 171786
19. #APPLIANCE COMPONENTS RV; Screw 8 X 1/2 Ph Ph MFR # 120615
20. #Furnace Burner Orifice; For Suburban Furnace NT12LEC/ NT16LEC/ NT20LEC/ NT20S/ NT16LE/ NT16S/ NT20L/ NT20SE/ NT20SQ/ NT20SEQ MFR # 180231
21. #Furnace Gasket; Furnace Manifold Gasket; Fits Suburban Furnace NT-12S/ NT-16S/ NT-16SE/ NT-16SQ/ NT-20S/ NT-20SE/ NT-20SQ MFR # 70449
22. #BURNER ASSEMBLY USE 10978S MFR # 10614 Superseded: see description
23. #Furnace Wiring Harness; Use With All Suburban Model NT And P Series Electrode Furnaces; 22 Inch Length MFR # 231261 Superseded: see description

Exploded View › Heat Chamber Assembly

Components

51 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. #APPLIANCE COMPONENTS RV; Fastener Tinnerman MFR # 121661
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 525028 MFR # 233352 Superseded: see description
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. #CHAMBER MFR # 20839
8. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
9. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
10. #APPLIANCE COMPONENTS RV; GROMMET MFR # 70243
11. #BACKWALL RADIATION SHIELD ASSY MFR # 110440
12. #SUBURBAN LIMIT SWITCH MFR # 230849
13. #SCREW #6 x 1/4 (2 REQ.) MFR # 120714
14. #GATEKING-F150 (04-14) MFR # 230714
15. #APPLIANCE COMPONENTS RV; Bushing Snap 1/2" MFR # 70270
16. #APPLIANCE COMPONENTS RV; Screw 6 X 5/8 Ph Ph MFR # 121357
17. #BOARD,MODULE USE 520741 MFR # 231741 Superseded: see description
18. #UIB S WITH POST TOP MFR # UIBSPOST
19. #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
20. #Furnace Wiring Harness; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE MFR # 520840
21. #ignition Control Circuit Board; Replacement For Suburban Furnace SF-Series (After Serial Number 003805481); 12 Volt DC MFR # 520820
22. #UIB WITH FAN CONTROL MFR # FAN50PLUS
23. #COVER FOR UIB S MFR # SMALLCOVER
24. #UNIVERSAL IGN BRD LARGE MFR # UIBL
25. #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
26. #Furnace Wiring Harness; For Suburban Furnace DD17DSI/ NT-Series MFR # 232161
27. #Ignition Control Circuit Board - Fits Suburban Water Heaters MFR # 520820MC
28. #UNIVERSAL IGN BRD SMALL MFR # UIBS
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. #APPLIANCE COMPONENTS RV; Relay MFR # 230625
31. #APPLIANCE COMPONENTS RV; Screw 6X3/8 Ph Rh Black MFR # 121502
32. #APPLIANCE COMPONENTS RV; BRKT COMB AIR HSG MFR # 62392
33. #APPLIANCE COMPONENTS RV; Gskt Burner Tunnel MFR # 70450
34. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
35. #Furnace Combustion Wheel; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE/ NT-20S/ NT-20SE MFR # 350082
36. #Furnace Combustion Air Housing Cover; For Suburban Furnace NT-12/ NT-16/ NT-20 Series MFR # 390222BK
37. #BOX,COMBUSTION AIR USE 390222BK MFR # 390222 Superseded: see description
38. #APPLIANCE COMPONENTS RV; 10-32 Elastic Stop Nut MFR # 121329
39. #Furnace Gasket; Furnace Combustion Air Box Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70446
40. #APPLIANCE COMPONENTS RV; 3/16 FLAT WASHER TY MFR # 120722
41. #Furnace Combustion Air Housing; Replacement For Suburban NT12/ NT16/ NT20 Series Furnaces MFR # 390223
42. #Furnace Motor Mounting Grommet; Replacement For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Rubber MFR # 530089
43. #Furnace Gasket; Furnace Motor Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70448
44. #APPLIANCE COMPONENTS RV; Motor MFR # 232878
45. #MOTOR USE 232878 MFR # 230634 Superseded: see description
46. #Furnace Room Air Impeller; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE MFR # 350083
47. #APPLIANCE COMPONENTS RV; BRKT HSG COMB AIR MTG MFR # 62290
48. #APPLIANCE COMPONENTS RV; Brkt Mtg MFR # 63249
49. #Furnace Fan Switch; For All V-Series Suburban Furnaces (After Serial Number 952202951) MFR # 232351
50. #VENT CAP/RANGE SHIELD MFR # 260572
51. #APPLIANCE COMPONENTS RV; Kit Gskt MFR # 520798

Replacement Furnace

Components

3 items

1. #HEATERS & FURNACES RV; Nt-20Seq 19 000 Suburban MFR # 2021APW
2. #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
3. #Furnace; NT Series; LP Gas; 19,000 BTU; 1 Stage; Direct Discharge; 2.8 Amp Draw; 9-3/8 Inch Width x 9-1/2 Inch Height x 21-1/2 Inch Depth; 45.21 Pounds; With Energy-Saving Direct Spark Ignition; With Gasket-Sealed Vent Assembly MFR # 2436APW

Exploded View › Cabinet Assy & Thermostat

Components

25 items

1. #Wall Thermostat; Single Stage; Snap-Action; Low Voltage; Heat Only; 24 Volt; White MFR # 01C20102S1
2. #APPLIANCE COMPONENTS RV; Thermostat 3 Day Program MFR # 1F80R850
3. #Wall Thermostat; Single Stage; For Heat/ Cool Control; Mechanical Readout; 12 Volt; Without Fan Speed Control; Without Fan On Mode MFR # 100402
4. #T-STAT, WALL USE 100402 MFR # 160902 Superseded: see description
5. #Wall Thermostat; Single Stage; For Heat And Cool Control; Programmable; Digital Display; 24 Volt; Battery Powered MFR # 1F87R875
6. #Wall Thermostat; Heat Only; Mechanical; 1 Stage; White; MFR # 1C20101
7. #APPLIANCE COMPONENTS RV; Screw 10 X 3/4 Ph Ph MFR # 121224
8. #APPLIANCE COMPONENTS RV; Screw 8X3/8 Phph Bk Oxide MFR # 121520
9. #1/2MPTX1/2FPT PEX LOCK SWIVEL MFR # 30785
10. #030520 303 FABRIC TOP MFR # 30520
11. #Furnace Access Door; For Suburban Furnace NT12SE/ NT16SE/ NT20SE; Black MFR # 30785BK
12. #Furnace Access Door; For Suburban Furnace NT12SE/ NT16SE/ NT16SEQ/ NT20SE/ NT20SEQ; Polar White MFR # 30785PW
13. #CABINET MFR # 100957
14. #APPLIANCE COMPONENTS RV; CAB/LABELS MFR # 101887
15. #APPLIANCE COMPONENTS RV; BUSHING SNAP MFR # 70569
16. #Furnace Intake Tube; For Suburban Furnace NT-16SEQ/ NT-20SEQ; 2-3/4 Inch Length MFR # 052160
17. #TUBE INTAKE MFR # 052161
18. #TUBE INTAKE MFR # 052162
19. #Furnace Intake Tube; For Suburban Furnace NT-16SE/ NT-20SE; 5 Inch Length; Steel; With Gasket MFR # 50712
20. ##T5-12 TUBE 30 LED SW MFR # 50708
21. #VENT CAP/RANGE SHIELD MFR # 260572
22. #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
23. #Screw; For Suburban Furnace Exhaust Vent; 8 X 3-1/4; Set Of 2 MFR # 121711
24. #Furnace Duct Cover Plate; Fits Suburban 4 Inch Duct MFR # 50733
25. #32646 BUG BUST BI-LING 32OZ MFR # 50558