Find the NT20SQ cabinet and intake parts first, then continue through the blower and switch references to the burner and gas-train items. The three drawings now appear outside the table for a better mobile reading experience.
Match the drawing callout to the manufacturer part number, and check any supersession or serial-number notes. Select a linked number for product details and availability.
1. Opening parts and reference view (1–9)
| Drawing reference | Manufacturer part number | Quantity | Original component description |
|---|---|---|---|
| 1 | 161154 | 1 | THERMOSTAT, WALL (WHITE) |
| 1 | 161210 | 1 | THERMOSTAT, WALL (BLACK) |
| 4 | 101884 | 1 | FRONT, CABINET |
| 5 | 101885 | 1 | CABINET |
| 6 | 50715 | 2 | DUCT COLLAR, 4 IN. |
| 7 | 70569 | 1 | BUSHING SNAP |
| 8 | 50906 | 1 | SUBURBAN INTAKE TUBE 3 IN |
| 8 | 50712 | 1 | TUBE, INTAKE 5IN LONG (STANDARD) |
| 8 | 521077 | 1 | TUBE ASSEMBLY, INTAKE 7-1/4 |
| 9 | 260580 | 1 | VENT CAP & EXHAUST TUBE ASSEMBLY, 6 IN. |
2. Continuation of part references (11–NS)
| Drawing reference | Manufacturer part number | Quantity | Original component description |
|---|---|---|---|
| 11 | 62476 | 1 | BRACKET, MICRO SW MOUNTING |
| 11 | 121247 | 1 | SCREW, 2-56 X 5/8 HEX |
| 12 | 233100 | 1 | MICRO SWITCH ASM USE 525028 |
| 12 | 233352 | 1 | MICRO SWITCH |
| 12 | 525028 | 1 | SERVICE KIT, SAIL SWITCH |
| 13 | 121951 | 2 | NUT #2-56 |
| 14 | 21201BK | 1 | COMBUSTION CHAMBER |
| 16 | 70362 | 1 | BUSHING, SNAP |
| 18 | 233022 | 1 | LIMIT SWITCH 170 DEGREE |
| 21 | 230714 | 1 | SPLICER |
| 23 | 70270 | 1 | BUSHING, SNAP 1/2 IN. |
| 26 | 521099 | 1 | IGNITION CONTROL MODULE |
| 29 | 62392 | 1 | BRACKET, COMBUSTION AIR HOUSING MOUNTING |
| 31 | 70450 | 1 | GASKET, BURNER TUNNEL |
| 36 | 391059 | 1 | HOUSING COMBUSTION AIR (REAR) |
| 38 | 350208 | 1 | WHEEL, COMBUSTION AIR |
| 41 | 391058 | 1 | HOUSING COMBUSTION AIR (FRONT) |
| 42 | 121928 | 10 | SCREW 6-19 X 1/2 PH PH |
| 44 | 521067 | 1 | MOTOR |
| 45 | 350207 | 1 | IMPELLER, ROOM AIR |
| 46 | 63447 | 1 | BRACKET, COMBUSTION AIR HOUSING MOUNTING |
| 56 | 63262 | 1 | BRACKET, SWITCH MOUNTING |
| 57 | 232351 | 1 | ON/OFF SWITCH |
| NS | 2611A | 1 | FURNACE CORE REPLACEMENT RP-16NQ |
3. Continuation of part references (49–70)
| Drawing reference | Manufacturer part number | Quantity | Original component description |
|---|---|---|---|
| 49 | 231931 | 1 | ELECTRODE (SINGLE PROBE) |
| 49 | 525033 | 1 | SERVICE KIT, ELECTRODE |
| 50 | 70163 | 1 | GASKET, ELECTRODE USE 071076 |
| 50 | 71076 | 1 | BURNER/ELECTRODE GASKET SET USE 72103 |
| 50 | 72103 | 1 | GASKET KIT, BURNER / ELECTRODE |
| 50 | 525011 | 1 | SERVICE KIT, GASKETS BURNER / ELECTRODE |
| 54 | 10978 | 1 | BURNER ASM. W/ACCESS DOOR |
| 55 | 70398 | 1 | GASKET, BURNER ACCESS DOOR USE 071076 |
| 59 | 170374 | 1 | GAS FITTING, 90° ELBOW |
| 59 | 525025 | 1 | SERVICE KIT, FITTING BRASS 3/8 90 DEG ELBOW |
| 63 | 171730 | 1 | PIPE, GAS INLET |
| 64 | 161123 | 1 | GAS VALVE 3/8 X 1/8 |
| 67 | 170746 | 1 | MANIFOLD ASSY |
| 69 | 180231 | 1 | ORIFICE, MAIN BURNER |
| 70 | 70449 | 1 | GASKET, MANIFOLD PIPE |
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 1 · MPN 161154
Suburban 161154 White Heat-Only Mechanical RV Furnace Thermostat
View product and availability
Diagram ref 1 · MPN 161210
Suburban 161210 Black Heat-Only Mechanical RV Furnace Thermostat
View product and availability
Diagram ref 26 · MPN 521099
Suburban 521099 12V Furnace Fan-Control Ignition Module
View product and availability
Diagram ref 36 · MPN 391059
Suburban 391059 Rear Furnace Combustion Air Housing NT16SEQ, NT16SQ, NT20SEQ & NT20SQ
View product and availability
Diagram ref 57 · MPN 232351
Suburban 232351 Furnace On/Off Switch | Select SF, SH & NT
View product and availability
Diagram ref 49 · MPN 525033
Suburban 525033 NT-Series Furnace Single-Probe Igniter
View product and availability
Diagram ref 50 · MPN 525011
Suburban 525011 Furnace Burner & Electrode Gasket Kit | NT/P
View product and availability
Diagram ref 64 · MPN 161123
Suburban 161123 12V Gas Valve | Selected NT/VT Furnaces
View product and availability