This compact NT20STC reference includes three illustrated areas but a shorter parts list. The diagrams have been moved out of the table cells, and each numbered part is grouped beneath the illustration that introduces it.
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 (5–9)
| Drawing reference | Manufacturer part number | Quantity | Original component description |
|---|---|---|---|
| 5 | 102200 | 1 | CABINET |
| 6 | 50733 | 1 | COVER, DUCT |
| 7 | 70569 | 1 | BUSHING SNAP |
| 8 | 50906 | 1 | SUBURBAN INTAKE TUBE 3 IN |
| 9 | 260541 | 1 | CAP, VENT - AND EXHAUST ASSY |
2. Continuation of part references (11A–44)
| Drawing reference | Manufacturer part number | Quantity | Original component description |
|---|---|---|---|
| 11A | 121247 | 2 | SCREW, 2-56 X 5/8 HEX |
| 11 | 62476 | 1 | BRACKET, MICRO SW MOUNTING |
| 12 | 230933 | 1 | MICRO SWITCH USE 233100 |
| 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 | 21186BK | 1 | COMBUSTION CHAMBER |
| 18 | 230635 | 1 | LIMIT SWITCH 170 DEGREE |
| 18 | 233022 | 1 | LIMIT SWITCH 170 DEGREE - Above Serial# 093800203 |
| 26 | 520820 | 1 | MODULE BOARD, WAS SUPERCEDED USE 521099 |
| 26 | 521099 | 1 | IGNITION CONTROL MODULE |
| 44 | 520950 | 1 | MOTOR KIT W/ GASKETS - NLA |
3. Continuation of part references (49–71)
| Drawing reference | Manufacturer part number | Quantity | Original component description |
|---|---|---|---|
| 49 | 231931 | 1 | ELECTRODE (SINGLE PROBE) |
| 49 | 525033 | 1 | SERVICE KIT, ELECTRODE |
| 54 | 30621 | 1 | BURNER ACCESS DOOR |
| 64 | 161123 | 1 | GAS VALVE 3/8 X 1/8 |
| 71 | 10614 | 1 | BURNER ASSEMBLY USE 10978 |
| 71 | 10978 | 1 | BURNER ASM. W/ACCESS DOOR |
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 26 · MPN 521099
Suburban 521099 12V Furnace Fan-Control Ignition Module
View product and availability
Diagram ref 49 · MPN 525033
Suburban 525033 NT-Series Furnace Single-Probe Igniter
View product and availability
Diagram ref 64 · MPN 161123
Suburban 161123 12V Gas Valve | Selected NT/VT Furnaces
View product and availability