Suburban Nt Series NT20S Parts Diagram · Exploded View › Cabinet Assy & Thermostat

Furnace · 4 assemblies · 4 diagram sheets · 107 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT20S RV furnace: 4 assemblies (Exploded View › Cabinet Assy & Thermostat, Replacement Furnace, Exploded View › Burner Assembly, Exploded View › Combustion Chamber-blower Asm) and 107 manufacturer part numbers. 22 parts are marked as superseded — the description gives the replacement number to order instead.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 › Cabinet Assy & Thermostat

Components

25 items

1. #Wall Thermostat; Single Stage; Snap-Action; Low Voltage; Heat Only; 24 Volt; White MFR # 01C20102S1
2. #Wall Thermostat; Single Stage; For Heat/ Cool Control; Mechanical Readout; 12 Volt; Without Fan Speed Control; Without Fan On Mode MFR # 100402
3. #T-STAT, WALL USE 100402 MFR # 160902 Superseded: see description
4. #Wall Thermostat; Single Stage; For Heat And Cool Control; Programmable; Digital Display; 24 Volt; Battery Powered MFR # 1F87R875
5. #Wall Thermostat; Heat Only; Mechanical; 1 Stage; White; MFR # 1C20101
6. #APPLIANCE COMPONENTS RV; Thermostat 3 Day Program MFR # 1F80R850
7. #APPLIANCE COMPONENTS RV; Screw 10 X 3/4 Ph Ph MFR # 121224
8. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
9. #APPLIANCE COMPONENTS RV; Cab Front/Labels MFR # 101884
10. #FRONT, CABINET USE 101884 MFR # 100960 Superseded: see description
11. #APPLIANCE COMPONENTS RV; Cab/Labels MFR # 101885
12. #WRAP, CABINET USE 101885 MFR # 100959 Superseded: see description
13. #NR627947 RETAINER-PANEL-12 UPR-BLK MFR # 50715
14. #APPLIANCE COMPONENTS RV; BUSHING SNAP MFR # 70569
15. #TUBE INTAKE MFR # 052162
16. ##T5-12 TUBE 30 LED SW MFR # 50708
17. #Furnace Intake Tube; For Suburban Furnace NT12S/ NT-16S/ NT-20S/ NT-16SQ/ NT-20SQ/ NT-30SP/ NT-34SP; 3 Inch Length MFR # 052159
18. #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
19. #Furnace Intake Tube; For Suburban Furnace NT-16SE/ NT-20SE; 5 Inch Length; Steel; With Gasket MFR # 50712
20. #TUBE INTAKE MFR # 052161
21. #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
22. #VENT CAP/RANGE SHIELD MFR # 260572
23. #Screw; For Suburban Furnace Exhaust Vent; 8 X 3-1/4; Set Of 2 MFR # 121711
24. #32646 BUG BUST BI-LING 32OZ MFR # 50558
25. #Furnace Duct Cover Plate; Fits Suburban 4 Inch Duct MFR # 50733

Replacement Furnace

Components

3 items

1. #NT-20SQ 19 000 HEATER MFR # 2450A
2. #UNIV LDR BAR CROSSMEMB MFR # 2019
3. #SUBURBAN PROPANCE FURNACE REPLACEMENT CORE (NT-16SQ/NT-20SQ) MFR # 2611A

Exploded View › Burner Assembly

Components

29 items

1. #SCREW 8-32 X 1/2 SLOT HEX MFR # 121387
2. #APPLIANCE COMPONENTS RV; Electrode MFR # 520775
3. #WIRE,HIGH VOLTAGE USE 231713 MFR # 318060002 Superseded: see description
4. #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
5. #ELECTRODE ASM USE 231258 MFR # 230820 Superseded: see description
6. #Furnace Wiring Harness; Use With All Suburban Model NT And P Series Electrode Furnaces; 22 Inch Length MFR # 231261 Superseded: see description
7. #ELECTRODE USE 79-8710 OR 520775 MFR # 231258 Superseded: see description
8. #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
9. #APPLIANCE COMPONENTS RV; Wire Electrode - N.L.A. MFR # 231713
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. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
14. #Ignition Control Circuit Board; Replacement For Atwood AFL Model Hydroflame Model Furnace; DSI Board; AC MFR # 30621
15. #Furnace Burner; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE; 0.57 Pound MFR # 10978S
16. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
17. #APPLIANCE COMPONENTS RV; Elbow 90 Deg MFR # 170082
18. #VALVE,SHUTOFF MFR # 160740
19. #Furnace Gasket; Furnace Gas Inlet Tube Gasket; Fits Suburban Furnace NT-45S MFR # 70432
20. #COVER PLATE, GAS INLET MFR # 62143
21. #PIPE GAS INLET MFR # 170748
22. #SUBURBAN VALVE MFR # 161123
23. #VALVE,GAS USE 161078 MFR # 160832 Superseded: see description
24. #VALVE, GAS USE 161123 MFR # 161078 Superseded: see description
25. #APPLIANCE COMPONENTS RV; Manifold MFR # 170746
26. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
27. #Furnace Burner Orifice; For Suburban Furnace NT12LEC/ NT16LEC/ NT20LEC/ NT20S/ NT16LE/ NT16S/ NT20L/ NT20SE/ NT20SQ/ NT20SEQ MFR # 180231
28. #Furnace Gasket; Furnace Manifold Gasket; Fits Suburban Furnace NT-12S/ NT-16S/ NT-16SE/ NT-16SQ/ NT-20S/ NT-20SE/ NT-20SQ MFR # 70449
29. #BURNER ASSEMBLY USE 10978S MFR # 10614 Superseded: see description

Exploded View › Combustion Chamber-blower Asm

Components

55 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; Sail Switch MFR # 230933
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; Fastener Tinnerman MFR # 121661
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; Bushing MFR # 70362
10. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
11. #Furnace Limit Switch;;For Suburban Furnace NT-12/ NT-16/ NT-20/ NT-12S/ NT-16S/ NT-20S MFR # SBB230621
12. #LIMIT SW MFR # 233484
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; Relay MFR # 230625
17. #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
18. #COVER FOR UIB S MFR # SMALLCOVER
19. #UIB L WITH POST TOP MFR # UIBLPOST
20. #UIB WITH FAN CONTROL MFR # FAN50PLUS
21. #ignition Control Circuit Board; Replacement For Suburban Furnace SF-Series (After Serial Number 003805481); 12 Volt DC MFR # 520820
22. #Furnace Wiring Harness; For Suburban Furnace DD17DSI/ NT-Series MFR # 232161
23. #UIB S WITH POST TOP MFR # UIBSPOST
24. #UNIVERSAL IGN BRD SMALL MFR # UIBS
25. #Ignition Control Circuit Board Cover; Replacement For Dinosaurs Universal Igniter Boards; Large; White; Fire Retardant ABS Plastic MFR # LCVR
26. #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
27. #Ignition Control Circuit Board - Fits Suburban Water Heaters MFR # 520820MC
28. #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
29. #Furnace Wiring Harness; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE MFR # 520840
30. #Nut; For Suburban Furnace NT-45S MFR # 121271
31. #CAP LUG #1-3/8 RED INSULATOR CAP F/ CIR BD MFR # 70549
32. #APPLIANCE COMPONENTS RV; BRKT COMB AIR HSG MFR # 62392
33. #APPLIANCE COMPONENTS RV; Screw 6 X 5/8 Ph Ph MFR # 121357
34. #APPLIANCE COMPONENTS RV; Gskt Burner Tunnel MFR # 70450
35. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
36. #Furnace Gasket; Furnace Combustion Air Box Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70446
37. #BOX,COMBUSTION AIR USE 390222BK MFR # 390222 Superseded: see description
38. #Furnace Combustion Air Housing Cover; For Suburban Furnace NT-12/ NT-16/ NT-20 Series MFR # 390222BK
39. #Furnace Combustion Wheel; For Suburban Furnace NT-12S/ NT-12SE/ NT-16S/ NT-16SE/ NT-20S/ NT-20SE MFR # 350082
40. #APPLIANCE COMPONENTS RV; Nut 10-32 Hex Lock MFR # 120716
41. #APPLIANCE COMPONENTS RV; Washer Flat 7/32Idx1/2Od MFR # 120684
42. #Furnace Combustion Air Housing; Replacement For Suburban NT12/ NT16/ NT20 Series Furnaces MFR # 390223
43. #Furnace Motor Mounting Grommet; Replacement For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Rubber MFR # 530089
44. #Furnace Gasket; Furnace Motor Gasket; Fits Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE MFR # 70448
45. #MOTOR USE 232878 MFR # 230634 Superseded: see description
46. #APPLIANCE COMPONENTS RV; Motor MFR # 232878
47. #Furnace Room Air Impeller; For Suburban Furnace NT-12S/ NT-16S/ NT-20S/ NT-12SE/ NT-16SE/ NT-20SE MFR # 350083
48. #APPLIANCE COMPONENTS RV; BRKT HSG COMB AIR MTG MFR # 62290
49. #BACKWALL RADIATION SHIELD ASSY MFR # 110441
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. #VENT CAP/RANGE SHIELD MFR # 260572
52. #APPLIANCE COMPONENTS RV; Kit Gskt MFR # 520798
53. #IGNITOR BOARDS AND ACCESS MFR # 12VDCTDR
54. #APPLIANCE COMPONENTS RV; Relay Switch MFR # 231202
55. #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