Use these four Suburban NT24S exploded illustrations in their service order: cabinet and duct connections, ignition and combustion chamber, burner and gas manifold, then room-air blower and motor. Match the numbered callouts to the part descriptions below.
Select a linked manufacturer number for product details and availability. Check the furnace model, serial-number range and any replacement notes before ordering.
1. Cabinet, ducts and wiring
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 1 | 100962 | 1 | CABINET ASSY USE 101874 |
| 1 | 101874 | 1 | CABINET ASM COMPLETE |
| 2 | 121378 | 1 | TINNERMAN U TYPE |
| 3 | 62164 | 1 | BOTTOM DUCT GASKET |
| 4 | 121388 | 1 | SCREW, #10 X 1/2 |
| 5 | 100808 | 1 | CABINET FRONT |
| 5A | 121224 | 2 | SCREW, #10 X 3/4 |
| 6 | 50715 | 3 | DUCT COLLAR, 4 IN. |
| 7 | 160849 | 1 | THERMOSTAT USE 161154 |
| 7 | 161154 | 1 | THERMOSTAT, WALL (WHITE) |
| 8 | 520322 | 1 | POWER SUPPLY HARNESS |
2. Electrodes, chamber and exhaust
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 9 | 121407 | 2 | SCREW 8-32 X 3/8 HEX BK |
| 10 | 230956 | 1 | ELECTRODE 3 PRONG - Below Serial# 920500001 |
| 10 | 525019 | 1 | SERVICE KIT, ELECTRODE - Below Serial# 920500001 |
| 10 | 231933 | 1 | ELECTRODE - Above Serial# 920500001 |
| 10 | 525029 | 1 | SERVICE KIT, ELECTRODE - Above Serial# 920500001 |
| NS | 231261 | 1 | ELECTRODE WIRE |
| 11 | 121421 | 2 | NUT, 10-24 HEX(THREAD LOCKING) |
| 12 | 30523 | 1 | ACCESS DOOR |
| 13 | 70163 | 1 | GASKET, ELECTRODE USE 071076 |
| 13 | 71076 | 1 | BURNER/ELECTRODE GASKET SET USE 72103 |
| 13 | 72103 | 1 | GASKET KIT, BURNER /ELECTRODE |
| 13 | 525011 | 1 | SERVICE KIT, GASKETS BURNER / ELECTRODE |
| 14 | 120158 | 2 | SCREW, #8 X 3/8 |
| 15 | 121388 | 4 | SCREW, #10 X 1/2 |
| 16 | 310026 | 1 | DISC, OBSERVATION GLASS |
| 17 | 290120 | 1 | OBSERVATION HOLE COVER |
| 18 | 70398 | 1 | GASKET, BURNER ACCESS DOOR USE 071076 |
| 18 | 71076 | 1 | BURNER/ELECTRODE GASKET SET USE 72103 |
| 18 | 72103 | 1 | GASKET KIT, BURNER /ELECTRODE |
| 18 | 525011 | 1 | SERVICE KIT, GASKETS BURNER / ELECTRODE |
| 19 | 20921 | 1 | COMBUSTION CHAMBER |
| 20 | 120158 | 2 | SCREW, #8 X 3/8 |
| 21 | 230496 | 1 | LIMIT SWITCH 230 DEGREE |
| 22 | 121252 | 1 | SCREW 10 X 3/8 PH PH |
| 23 | 121252 | 1 | SCREW 10 X 3/8 PH PH |
| 24 | 70362 | 1 | BUSHING, SNAP |
| 25 | 121252 | 2 | SCREW 10 X 3/8 PH PH |
| 26 | 60270 | 1 | WIRE CLAMP |
| 27 | 230714 | 1 | SPLICER |
| 28 | 120714 | 2 | SCREW, #6 X 1/4 |
| 29 | 120158 | 1 | SCREW, #8 X 3/8 |
| 30 | 70270 | 1 | BUSHING, SNAP 1/2 IN. |
| 31 | 62135 | 1 | BRACKET, POWER SUPPLY |
| 32 | 120158 | 2 | SCREW, #8 X 3/8 |
| 33 | 60270 | 1 | WIRE CLAMP |
| 34 | 120158 | 1 | SCREW, #8 X 3/8 |
| 35 | 230587 | 1 | MODULE BOARD USE 520741 |
| 35 | 520741 | 1 | MODULE BOARD, WAS SUPERCEEDED BY 520820. USE 521099 |
| 35 | 520820 | 1 | MODULE BOARD, WAS SUPERCEEDED USE 521099 |
| 35 | 521099 | 1 | IGNITION CONTROL MODULE |
| 36 | 121357 | 2 | SCREW 6 X 5/8 PH PH |
| 37 | 70549 | 1 | INSULATOR CAP |
| 38 | 70538 | 1 | INSULATOR, MODULE BOARD |
| 40 | 231202 | 1 | TIME DELAY RELAY USE 521069 |
| 40 | 521069 | 1 | TIME DELAY RELAY |
| 41 | 121357 | 2 | SCREW 6 X 5/8 PH PH |
| 42 | 260164 | 1 | VENT CAP, EXHAUST TUBE ASSY |
| 43 | 50906 | 1 | SUBURBAN INTAKE TUBE 3 IN |
| 44 | 110504 | 1 | RADIATION SHIELD ASSEMBLY |
| 45 | 110504 | 4 | SCREW, #10 X 3/4 |
| 46 | 121224 | 1 | SCREW #8 X 3 1/4 |
| 46 | 121256 | 1 | SCREW #8X3.25 PH PH 410SS |
| NS | 121711 | 1 | FAN SWITCH - Below Serial# 1600851 |
3. Gas system and burner
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 22 | 121252 | 1 | SCREW 10 X 3/8 PH PH |
| 48 | 10619 | 1 | BURNER |
| 49 | 180215 | 1 | ORIFICE, #54 |
| 50 | 70408 | 1 | GASKET, MANIFOLD PIPE |
| 51 | 121388 | 4 | SCREW, #10 X 1/2 |
| 52 | 170757 | 1 | MANIFOLD ASM |
| 53 | 160832 | 1 | VALVE USE 161078 |
| 53 | 161078 | 1 | VALVE USE 161123 |
| 53 | 161123 | 1 | GAS VALVE 3/8 X 1/8 |
| 54 | 170858 | 1 | PIPE GAS INLET |
| 56 | 70432 | 1 | GASKET, GAS INLET |
| 57 | 170082 | 1 | ELBOW 90 DEG X 3/8 NPT |
| 58 | 70534 | 1 | GASKET DISC COVER |
| 59 | 62408 | 1 | DISC COVER, GAS INLET |
| 60 | 160740 | 1 | VALVE, SHUTOFF |
4. Blower, motor and air intake
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 61 | 350076 | 1 | WHEEL, ROOM AIR USE 350113 |
| 61 | 350113 | 1 | WHEEL, ROOM AIR |
| 62 | 121252 | 4 | SCREW 10 X 3/8 PH PH |
| 63 | 390283 | 1 | HOUSING, BLOWER |
| 64 | 121227 | 3 | SCREW,10-24 X 1/2 |
| 65 | 230510 | 1 | MICRO SWITCH |
| 66 | 121247 | 2 | SCREW, 2-56 X 5/8 HEX |
| 67 | 121364 | 2 | WASHER, LOCK #2 |
| 68 | 120672 | 2 | NUT, HEX #2 -56 |
| 69 | 121388 | 3 | SCREW, #10 X 1/2 |
| 70 | 62138 | 3 | BRACKET MOTOR MOUNTING |
| 71 | 120717 | 3 | NUT, HEX # 10-24 KEPS |
| 72 | 70385 | 2 | GASKET CROSSOVER TUBE |
| 73 | 50751 | 1 | TUBE, CROSSOVER |
| 74 | 121388 | 2 | SCREW, #10 X 1/2 |
| 75 | 231206 | 1 | MOTOR |
| 76 | 70384 | 1 | GASKET, MOTOR MOUNT |
| 77 | 390179 | 1 | HOUSING COMBUSTION AIR ASSY |
| 78 | 121436 | 2 | SCREW #10-16 X 1/2 |
| 79 | 350069 | 1 | WHEEL, COMBUSTION AIR USE 350110 |
| 79 | 350110 | 1 | WHEEL COMBUSTION AIR |
| 80 | 121436 | 3 | SCREW #10-16 X 1/2 |
| 81 | 70386 | 1 | GASKET, COMBUSTION AIR |
| 82 | 390240 | 1 | HOUSING, CUMBUSTION AIR OUTSIDE USE 390424 |
| 82 | 390424 | 1 | HOUSING, COMBUSTION AIR (OUTSIDE) |
| 83 | 121252 | 9 | SCREW 10 X 3/8 PH PH |
Replacement parts shown in the diagrams
The products pictured below have manufacturer numbers linked in the reference tables above. Confirm the furnace model, serial number and production revision before ordering. See individual listings for current availability.
Diagram ref 7 · MPN 161154
Suburban 161154 White Heat-Only Mechanical RV Furnace Thermostat
View product and availability
Diagram ref 8 · MPN 520322
Suburban 520322 Furnace Power Supply Wiring Harness, With 3-Pin Female Connector
View product and availability
Diagram ref 10 · MPN 525019
Suburban 525019 Igniter Electrode | P-30S/P-40, Early NT
View product and availability
Diagram ref NS · MPN 231261
Suburban 231261 22-Inch Electrode Wire for NT/P Furnaces
View product and availability
Diagram ref 18 · MPN 525011
Suburban 525011 Furnace Burner & Electrode Gasket Kit | NT/P
View product and availability
Diagram ref 35 · MPN 521099
Suburban 521099 12V Furnace Fan-Control Ignition Module
View product and availability
Diagram ref 53 · MPN 161123
Suburban 161123 12V Gas Valve | Selected NT/VT Furnaces
View product and availability
Diagram ref 71 · MPN 120717
Suburban 120717 #10-24 Plastic Hex Replacement Nut
View product and availability