Suburban Nt Series NT42S Parts Diagram · Exploded View › Cabinet Assembly

Furnace · 5 assemblies · 10 diagram sheets · 111 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT42S RV furnace: 5 assemblies (Exploded View › Cabinet Assembly, Exploded View › Blower Assembly, Exploded View › Burner Assembly, Replacement, Exploded View › Combustion Chamber) and 111 manufacturer part numbers. 22 parts are marked as superseded — the description gives the replacement number to order instead.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 Assembly

Components

20 items

1. #CABINET ASSEMBLY MFR # 100996
2. #APPLIANCE COMPONENTS RV; Sububan Tinnerman Fastene MFR # 121662
3. #Stove Mounting Bracket; For Suburban Range; Angled; Single MFR # 122060
4. #Fifth Wheel Trailer Hitch; 16000 Pound Weight Carrying Capacity; With Mounting Rails MFR # 70546
5. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
6. #CABINET FRONT MFR # 100997
7. #PUMP ASM, OIL MFR # 70547G
8. #Screw; For Suburban Furnace NT-Series; Fits Suburban Furnace Combustion Chamber; #10 x 3/8 Inch MFR # 121252
9. #NR627947 RETAINER-PANEL-12 UPR-BLK MFR # 50715
10. #Furnace Duct Collar; Use With Suburban Furnace Model P-40; 2 Inch Diameter; Round MFR # 51240S Superseded: see description
11. #Wall Thermostat; Single Stage; For Heat Control; Mechanical Readout; White Case MFR # 161154
12. #Wall Thermostat; Single Stage; For Heat/ Cool Control; Mechanical Readout; 12 Volt; Without Fan Speed Control; Without Fan On Mode MFR # 100402
13. #T-STAT USE 161154 MFR # 160849 Superseded: see description
14. #Wall Thermostat; Single Stage; For Heat And Cool Control; Programmable; Digital Display; 24 Volt; Battery Powered MFR # 1F87R875
15. #Wall Thermostat; Single Stage; Snap-Action; Low Voltage; Heat Only; 24 Volt; White MFR # 01C20102S1
16. #Wall Thermostat; Heat Only; Mechanical; 1 Stage; White; MFR # 1C20101
17. #APPLIANCE COMPONENTS RV; Thermostat 3 Day Program MFR # 1F80R850
18. #Furnace Power Supply Wiring Harness; For Suburban Furnace; With 3-Pin Female Connector MFR # 230789
19. #CABINET FRONT ASSY COMPLETE ITEMS 4, 5, 6 MFR # 101002
20. #Furnace Duct Cover Plate; Fits Suburban 4 Inch Duct MFR # 50733

Exploded View › Blower Assembly

Components

29 items

1. #Furnace Blower Wheel; For Suburban Furnace NT-40 MFR # 350098
2. #Screw; For Suburban Furnace NT-Series; Fits Suburban Furnace Combustion Chamber; #10 x 3/8 Inch MFR # 121252
3. #APPLIANCE COMPONENTS RV; Hsg Blower MFR # 390384BK
4. #APPLIANCE COMPONENTS RV; Hsg Blower MFR # 390384
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 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
7. #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
8. #Furnace Low Air Flow Switch; For Suburban Furnace NT-40 MFR # 233355
9. #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
10. #Furnace Low Air Flow Switch; For Suburban Furnace NT-40; Also Use New Number 233355 MFR # 232279 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; Fastener Tinnerman MFR # 121661
13. #Screw; Furnace Blower Screw; #10 x 1/4 Inch; Single MFR # 121577
14. #Furnace Motor Bracket; For Suburban NT-40 MFR # 62138
15. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
16. #Furnace Gasket; Furnace Crossover Tube Gasket; Fits Suburban Furnace NT-24M/ NT-30M/ NT-30SP/ NT-34SP/ NT-40 MFR # 70385
17. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
18. #Furnace Motor; For Suburban Furnace NT-34M/ NT-34S/ NT-34SP/ NT-40S/ NT-42S/ NT-42T MFR # 231208
19. #Furnace Motor; For Suburban Furnace Models NT-34M/ NT-34S/ NT-34SP/ NT-40S/ NT-42S/ NT-42T; Also Use New Number 521138MC MFR # 231208MC Superseded: see description
20. #KIT MOTOR/MTG BRKTS MFR # 521138
21. #MOTOR, BLOWER (169) 231208 MFR # PE2787Q
22. #Furnace Gasket; Motor Mount Gasket; Fits Suburban Furnace NT-40 MFR # 70384
23. #APPLIANCE COMPONENTS RV; Suburban Comb Air Housing MFR # 390179
24. #APPLIANCE COMPONENTS RV; Screw #10-16 X 1/2 MFR # 121436
25. #WHEEL COMB AIR - obsolete MFR # 350077
26. #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
27. #Furnace Combustion Air Housing Cover; For Suburban Furnace NT30SP/ NT34SP/ NT40 MFR # 390424
28. #Furnace Combustion Air Housing Cover Mounting Clip; For Suburban Furnace NT24BW/ NT30SP/ NT24SP/ NT34SP/ NT40/ NT42T/ NT34BW/ NT30BW/ P30S/ P40/ P40S MFR # 121712
29. #APPLIANCE COMPONENTS RV; Screw 8 X 1/2 Ph Ph MFR # 120615

Exploded View › Burner Assembly

Components

10 items

1. #BURNER - NLA NT42T MFR # 10639
2. #Furnace Burner Orifice; For Suburban Furnace SF-42/ SF-42/ NT-40/ P-40 MFR # 180216
3. #Furnace Gasket; Furnace Manifold Gasket; Fits Suburban Furnace NT-24SP/ NT-30SP/ NT-34SP/ NT-40/ P-30S/ P-40/ P-40B MFR # 70408
4. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
5. #MANIFOLD ASM ***USE 73-0833*** MFR # 170757 Superseded: see description
6. #SUBURBAN VALVE MFR # 161123
7. #VALVE,GAS USE 161078 MFR # 160832 Superseded: see description
8. #VALVE, GAS USE 161123 MFR # 161078 Superseded: see description
9. #APPLIANCE COMPONENTS RV; St Ell MFR # 170012
10. #VALVE,SHUTOFF MFR # 160740

Replacement

Components

1 item

1. #FURNACE 45000 BTU 13 1/2H X 20 1/4W X 24D MFR # NT45SN

Exploded View › Combustion Chamber

Components

57 items

1. #COVER PLATE MFR # 209120
2. #DOOR BURNER - NLA MFR # 30523
3. #SCREW MFR # 30523C
4. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
5. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
6. #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
7. #GASKET, PILOT BURNER USE 71076 MFR # 70163 Superseded: see description
8. #APPLIANCE COMPONENTS RV; Screw 8-32 X 3/8 Hex Hd MFR # 121407
9. #Furnace Wiring Harness; Use With All Suburban Model NT And P Series Electrode Furnaces; 22 Inch Length MFR # 231261 Superseded: see description
10. #ELECTRODE USE 230956 MFR # 230889 Superseded: see description
11. #Igniter Electrode; For Suburban Furnace NT-24M/ NT-30M/ NT-34M; Without Gasket MFR # 520733
12. #WIRE,HIGH VOLTAGE USE 231713 MFR # 318060002 Superseded: see description
13. #Igniter Electrode; For Suburban Furnace Models NT-24M/ NT-30M/ NT-34M; Without Gasket MFR # 520733MC
14. #APPLIANCE COMPONENTS RV; Wire Electrode - N.L.A. MFR # 231713
15. #APPLIANCE COMPONENTS RV; Ignitor Wire MFR # 230949
16. #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
17. #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
18. #APPLIANCE COMPONENTS RV; Nut 10-24 Hex Lock (Std) MFR # 121421
19. #Furnace Access Door Sight Glass; Replacement For Suburban Furnace NT-Series/ P-45M/ P-45S MFR # 310026
20. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
21. #COMBUSTION CHAMBER USE 20928S MFR # 20901 Superseded: see description
22. #CHAMBER/SHIELD - NLA MFR # 20928S
23. #BUMPER CAPS BLACK 2 PER CARD MFR # 40303
24. #APPLIANCE COMPONENTS RV; Bushing MFR # 70362
25. #APPLIANCE COMPONENTS RV; Bushing Snap 3/8" MFR # 70483
26. #Furnace Limit Switch; For Suburban Furnace NT-42TS/ NT-42T MFR # 230888
27. #RADIATION SHIELD ASSEMBLY MFR # 110489
28. #BRACKET, POWER SUPPLY MFR # 62509
29. #BOARD,MODULE USE 520741 (05152435103) MFR # 230587 Superseded: see description
30. #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
31. #Furnace Wiring Harness; For Suburban Furnace DD17DSI/ NT-Series MFR # 232161
32. #UNIVERSAL IGN BRD SMALL MFR # UIBS
33. #UIB WITH FAN CONTROL MFR # FAN50PLUS
34. #UNIVERSAL IGN BRD LARGE MFR # UIBL
35. #UIB S WITH POST TOP MFR # UIBSPOST
36. #Ignition Control Circuit Board Cover; Replacement For Dinosaurs Universal Igniter Boards; Large; White; Fire Retardant ABS Plastic MFR # LCVR
37. #COVER FOR UIB S MFR # SMALLCOVER
38. #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
39. #UIB L WITH POST TOP MFR # UIBLPOST
40. #APPLIANCE COMPONENTS RV; NUT HEX 6-32 MFR # 120744
41. #APPLIANCE COMPONENTS RV; Insulation MFR # 70538
42. #Water Heater Burner; Large; For Suburban Water Heater SSRV6/ SSRV6M/ ESSRV6/ SSRV8/ SSRV8M/ ESSRV8/ SSRV10/ SSRV10M/ ESSWRV10/ 10ARVM/ E10ARV; With Target/ Burner Support Bracket/ Shutter/ Screw/ Nut/ Pilot Bracket/ Pilot Burner/ Thermocouple/ Tube/ Tube Fitting MFR # 520564
43. #BURNER, LARGE W/AIR SHUTTER USE 520564 MFR # 3000003 Superseded: see description
44. #APPLIANCE COMPONENTS RV; Screw 6 X 5/8 Ph Ph MFR # 121357
45. #APPLIANCE COMPONENTS RV; Washer Flat Nylon MFR # 121565
46. #APPLIANCE COMPONENTS RV; Bushing Snap 1/2" MFR # 70270
47. #Screw; Furnace Blower Screw; #10 x 1/4 Inch; Single MFR # 121577
48. #Screw; For Suburban Furnace NT-Series; Fits Suburban Furnace Combustion Chamber; #10 x 3/8 Inch MFR # 121252
49. #GASKET, RADIATION SHIELD, FRONT FLANGE MFR # 70614
50. #GASKET,RADIATION SHEILD SIDE FLANGE MFR # 70613S
51. #NYLON SPACER WASHER 5/16 THICK (4 REQUIRED) MFR # 121621
52. #Furnace Limit Switch; For Suburban Furnace Models NT-24M/ NT-30M/ NT-34M/ NT-24S/ NT-30S/ NT-34S MFR # 230575MC
53. #Furnace Limit Switch; For Suburban Furnace NT-24M/ NT-30M/ NT-34M/ NT-24S/ NT-30S/ NT-34S (Below Serial Number 1600851) MFR # 230575
54. #KIT, SVC PRESSURE ELBOW ASSY MFR # 90287
55. #THERMOSTAT RELAY MFR # 230423
56. #APPLIANCE COMPONENTS RV; Screw 10 X 3/4 Ph Ph MFR # 121224
57. #VENT CAP MFR # 260124