Suburban Nt Series NT40 Parts Diagram · Exploded View › Burner Assembly

Furnace · 5 assemblies · 10 diagram sheets · 100 parts · by Andrew Strick, mobile RV technician

OEM exploded parts diagrams for the Suburban Nt Series NT40 RV furnace: 5 assemblies (Exploded View › Burner Assembly, Exploded View › Cabinet Assembly, Replacement, Exploded View › Blower Assembly, Exploded View › Combustion Chamber) and 100 manufacturer part numbers. 22 parts are marked as superseded — the description gives the replacement number to order instead.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 › Burner Assembly

Components

11 items

1. #Furnace Burner; For Suburban Furnace Model NT40 MFR # 10702
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. #Furnace Manifold; Use With Suburban Furnace Model P-40/ NT40 MFR # 171472 Superseded: see description
6. #APPLIANCE COMPONENTS RV; BRKT VALVE MFR # 63265
7. #APPLIANCE COMPONENTS RV; Elbow MFR # 171427
8. #Water Heater Gas Inlet Elbow; For Suburban Water Heater SW4-D; 90 Degree; Also Use New Number 525025 MFR # 170374 Superseded: see description
9. #Water Heater Gas Inlet Elbow; For Suburban Water Heater SW4-D; 90 Degree; 3/8 Inch; Single MFR # 525025
10. #Screw; For Suburban Furnace NT-Series; Fits Suburban Furnace Combustion Chamber; #10 x 3/8 Inch MFR # 121252
11. #SUBURBAN VALVE MFR # 161123

Exploded View › Cabinet Assembly

Components

22 items

1. #APPLIANCE COMPONENTS RV; Cabinet Assy MFR # 101880
2. #Stove Mounting Bracket; For Suburban Range; Angled; Single MFR # 122060
3. #APPLIANCE COMPONENTS RV; Sububan Tinnerman Fastene MFR # 121662
4. #Screw; Use With Suburban Furnace Model NT40; Phillips Head; 10-24 x 1/2 MFR # 121227 Superseded: see description
5. #APPLIANCE COMPONENTS RV; Cabinet Front MFR # 101879
6. #APPLIANCE COMPONENTS RV; Screw 10 X 3/4 Ph Ph MFR # 121224
7. #NR627947 RETAINER-PANEL-12 UPR-BLK MFR # 50715
8. #T-STAT, WALL USE 100402 MFR # 160902 Superseded: see description
9. #APPLIANCE COMPONENTS RV; Thermostat 3 Day Program MFR # 1F80R850
10. #Wall Thermostat; Single Stage; For Heat/ Cool Control; Mechanical Readout; 12 Volt; Without Fan Speed Control; Without Fan On Mode MFR # 100402
11. #Wall Thermostat; Heat; Not Programmable; Mechanical Readout; Black MFR # 161210
12. #Wall Thermostat; Single Stage; Snap-Action; Low Voltage; Heat Only; 24 Volt; White MFR # 01C20102S1
13. #Wall Thermostat; Single Stage; For Heat Control; Mechanical Readout; White Case MFR # 161154
14. #Wall Thermostat; Heat Only; Mechanical; 1 Stage; White; MFR # 1C20101
15. #Wall Thermostat; Single Stage; For Heat And Cool Control; Programmable; Digital Display; 24 Volt; Battery Powered MFR # 1F87R875
16. #Furnace Vent; For Suburban Furnace NT-40/ P-40; With 7 Inch To 9 Inch Length Extension Tube MFR # 520596
17. #Furnace Duct Cover Plate; Fits Suburban 4 Inch Duct MFR # 50733
18. #EXTENSION KIT, VENT TUBE 3 1/8" - 4 7/8" MFR # 520594
19. #Furnace Power Supply Wiring Harness; For Suburban Furnace; With 3-Pin Female Connector MFR # 230789
20. #Furnace Vent; For Suburban Furnace NT-40/ P-40; With 4.78 Inch To 7 Inch Length Extension Tube MFR # 520595
21. #Furnace Gasket; Bottom Duct Gasket; Fits Suburban Furnace NT-24SP/ NT-30SP/ NT-40 MFR # 520009
22. #EXTENSION,VENT (USE 520932) MFR # 520593 Superseded: see description

Replacement

Components

3 items

1. #Furnace Core; NT Series; LP Gas; Model Number NT-40; 40,000 BTU; 9.5 Amp Draw; 12 Inch Width x 12-1/2 Inch Height x 23 Inch Depth; 25.55 Pounds; With Energy-Saving Electronic Ignition; With Gasket-Sealed Vent Assembly MFR # 2455A
2. #RP-40 FURNACE CORE N MFR # 2614A
3. #APPLIANCE COMPONENTS RV; Kit Vent MFR # 520501

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 # 390384
4. #APPLIANCE COMPONENTS RV; Hsg Blower MFR # 390384BK
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 233356 MFR # 230509 Superseded: see description
7. #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
8. #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
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-40 MFR # 233355
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 Models NT-34M/ NT-34S/ NT-34SP/ NT-40S/ NT-42S/ NT-42T; Also Use New Number 521138MC MFR # 231208MC Superseded: see description
19. #Furnace Motor; For Suburban Furnace NT-34M/ NT-34S/ NT-34SP/ NT-40S/ NT-42S/ NT-42T MFR # 231208
20. #MOTOR, BLOWER (169) 231208 MFR # PE2787Q
21. #KIT MOTOR/MTG BRKTS MFR # 521138
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. #Furnace Combustion Wheel; For Use With Suburban Furnace NT24BW/ NT24SP/ NT30BW/ NT30SP/ NT34BW/ NT34SP/ NT40/ P30S; With Clamp MFR # 350110 Superseded: see description
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 › Combustion Chamber

Components

45 items

1. #APPLIANCE COMPONENTS RV; Chamber/Shield MFR # 21166BK
2. #Screw; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; 10 x 1/2; Serrated Head; Single MFR # 121388
3. #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
4. #GASKET, PILOT BURNER USE 71076 MFR # 70163 Superseded: see description
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. #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
7. #SERVICE KIT ELECTRODE MFR # 525029
8. #Igniter Electrode; For Suburban Furnace NT-24/ NT-30/ NT-34/ NT-24S/ NT-30S/ NT-34S/ NT-24SP/ NT-30SP/ NT-34SP (Above Serial Number 920500001); Without Gasket; Also Use New Number 525029 MFR # 231933 Superseded: see description
9. #ELECTRODE REPLACES 231933MC MFR # 525029MC
10. #APPLIANCE COMPONENTS RV; Screw 8-32 X 3/8 Hex Hd MFR # 121407
11. #Nut; For Suburban Furnace NT-12SE/ NT-16SE/ NT-20SE; Fits Furnace Combustion Air Housing; Locking; #10-24 Thread Size MFR # 120717
12. #Furnace Access Door; For Suburban Furnace NT40; Burner Access Panel Assembly MFR # 30764
13. #GASKET,BURNER USE 71076 MFR # 70398 Superseded: see description
14. #Screw; For Suburban Furnace NT-Series; Fits Suburban Furnace Combustion Chamber; #10 x 3/8 Inch MFR # 121252
15. #Furnace Limit Switch; For Suburban Furnace NT-40 MFR # 231807
16. #APPLIANCE COMPONENTS RV; #8 Screw MFR # 120158
17. #APPLIANCE COMPONENTS RV; Bushing MFR # 70362
18. #GATEKING-F150 (04-14) MFR # 230714
19. #Screw; For Suburban Furnace NT-24SP/ NT-30SP/ NT-34SP; 6 x 1/4 Inch MFR # 121244
20. #APPLIANCE COMPONENTS RV; BRKT PWR SPLY MFR # 63248
21. #UIB WITH FAN CONTROL MFR # FAN50PLUS
22. #Ignition Control Circuit Board - Fits Suburban Water Heaters MFR # 520820MC
23. #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
24. #ignition Control Circuit Board; Replacement For Suburban Furnace SF-Series (After Serial Number 003805481); 12 Volt DC MFR # 520820
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. #APPLIANCE COMPONENTS RV; Screw 6 X 5/8 Ph Ph MFR # 121357
27. #APPLIANCE COMPONENTS RV; Insul Mod Board MFR # 70807
28. #APPLIANCE COMPONENTS RV; BUSHING SNAP MFR # 231827
29. #APPLIANCE COMPONENTS RV; Bushing Snap 7/8" MFR # 230218
30. #APPLIANCE COMPONENTS RV; Panel Mod Board MFR # 90301
31. #TUBE VENT USE 47-1893 OR 52041 MFR # 50933 Superseded: see description
32. #APPLIANCE COMPONENTS RV; Suburban Intake Tube Assy MFR # 52041S
33. #CAP,VENT/EXH TUBE -USE 79-8862 OR 260350 MFR # 260123 Superseded: see description
34. #APPLIANCE COMPONENTS RV; VENT CAP WITH RAIN SHIELD MFR # 260560
35. #Screw; For Use With Suburban Furnace Vent NT.12SE/ NT-16SE/ NT-20SE; #10 x 3/4 MFR # 121853 Superseded: see description
36. #Furnace Fan Switch; For All V-Series Suburban Furnaces (After Serial Number 952202951) MFR # 232351
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. #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
39. #IGNITOR BOARDS AND ACCESS MFR # 12VDCTDR
40. #EXTENSION KIT, VENT TUBE 3 1/8" - 4 7/8" MFR # 520594
41. #APPLIANCE COMPONENTS RV; Relay Switch MFR # 231202
42. #Furnace Vent; For Suburban Furnace NT-40/ P-40; With 7 Inch To 9 Inch Length Extension Tube MFR # 520596
43. #EXTENSION,VENT (USE 520932) MFR # 520593 Superseded: see description
44. #Furnace Vent; For Suburban Furnace NT-40/ P-40; With 4.78 Inch To 7 Inch Length Extension Tube MFR # 520595
45. #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