Suburban NT20SQ Furnace Service Diagrams and OEM Parts

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)

Suburban NT20SQ furnace model-specific service reference illustration 1
Source illustration 1 of 3 · Reference numbers 1 through 9 as shown in the accompanying list.
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)

Suburban NT20SQ furnace model-specific service reference illustration 2
Source illustration 2 of 3 · Reference numbers 11 through NS as shown in the accompanying list.
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)

Suburban NT20SQ furnace model-specific service reference illustration 3
Source illustration 3 of 3 · Reference numbers 49 through 70 as shown in the accompanying list.
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

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