Suburban NT42T Furnace Exploded Diagrams and Parts

This model-specific NT42T reference presents the cabinet/harness, combustion and vent, burner/manifold, and motor/blower assemblies in drawing order. Match each numbered position to its source manufacturer number without substituting a similar NT-series model.

Select a linked manufacturer part number for product details and availability. Match the furnace model and any serial-number restrictions before ordering.

1. Cabinet, ducts and wiring

Suburban NT42T cabinet and duct exploded parts illustration 1
Illustration 1 of four. Use the callout to identify its manufacturer service number.
Reference Manufacturer part number Quantity Component description
1 101033 1 CABINET ASSEMBLY
2 50715 4 DUCT COLLAR, 4 IN.
2A 70612 4 GASKET, DUCT COLLAR
3 101002 1 CABINET FRONT ASSM.
4 121224 2 SCREW, #10 X 3/4
5 121389 2 SCREW, #10 X 1/2
6 160902 1 WALL THERMOSTAT USE 161154
6 161154 1 THERMOSTAT, WALL (WHITE)
7 230789 1 POWER SUPPLY HARNESS (FEMALE)

2. Ignition, chamber and exhaust

Suburban NT42T electrode and combustion exploded parts illustration 2
Illustration 2 of four. Use the callout to identify its manufacturer service number.
Reference Manufacturer part number Quantity Component description
8 121407 2 SCREW 8-32 X 3/8 HEX BK
9 230956 1 ELECTRODE 3 PRONG
9 525019 1 SERVICE KIT, ELECTRODE
NS 231261 1 ELECTRODE WIRE
10 121421 2 NUT, 10-24 HEX(THREAD LOCKING)
11 30764 1 BURNER ACCESS DOOR
12 70163 1 GASKET, ELECTRODE USE 071076
12 71076 1 BURNER/ELECTRODE GASKET SET USE 72103
12 72103 1 GASKET KIT, BURNER /ELECTRODE
12 525011 1 SERVICE KIT, GASKETS BURNER / ELECTRODE
14 121388 4 SCREW, #10 X 1/2
17 70398 1 GASKET, BURNER ACCESS DOOR USE 071076
17 71076 1 BURNER/ELECTRODE GASKET SET USE 72103
17 72103 1 GASKET KIT, BURNER /ELECTRODE
17 525011 1 SERVICE KIT, GASKETS BURNER / ELECTRODE
18 20927 1 COMBUSTION CHAMBER
19 120158 2 SCREW, #8 X 3/8
20 230888 1 LIMIT SWITCH 240 DEGREE
22 121252 1 SCREW 10 X 3/8 PH PH
23 70362 1 BUSHING, SNAP
24 121252 2 SCREW 10 X 3/8 PH PH
25 60270 1 WIRE CLAMP
26 230714 1 SPLICER
27 120714 2 SCREW, #6 X 1/4
28 120158 1 SCREW, #8 X 3/8
29 70270 1 BUSHING, SNAP 1/2 IN.
30 62135 1 BRACKET, POWER SUPPLY
31 120158 2 SCREW, #8 X 3/8
34 230587 1 MODULE BOARD USE 520741
34 520741 1 MODULE BOARD, WAS SUPERCEEDED BY 520820. USE 521099
34 520820 1 MODULE BOARD, WAS SUPERCEEDED USE 521099
34 521099 1 IGNITION CONTROL MODULE
36 121357 2 SCREW 6 X 5/8 PH PH
37 70538 1 INSULATOR, MODULE BOARD
38 90301 1 PANEL, BOARD MOUNTING
39 231202 1 TIME DELAY RELAY USE 521069
39 521069 1 TIME DELAY RELAY
40 121357 2 SCREW 6 X 5/8 PH PH
41 260123 1 CAP,VENT/EXH TUBE ASSY USE 260350
41 260350 1 VENT CAP & EXHAUST TUBE ASSY USE 260560
41 260560 1 VENT CAP, EXHAUST TUBE, RAIN SHEILD ASSY
42 52041 1 INTAKE TUBE ASSY
42 50933 1 TUBE, INTAKE 3IN LONG 2IN OD USE 52041
43 110506 1 RADIATION SHIELD ASSY
44 50633 1 COLLAR/SHIELD EXH
45 121224 4 SCREW, #10 X 3/4

3. Burner, gas valve and manifold

Suburban NT42T burner and gas exploded parts illustration 3
Illustration 3 of four. Use the callout to identify its manufacturer service number.
Reference Manufacturer part number Quantity Component description
47 10639 1 BURNER ASSEMBLY
48 180216 1 ORIFICE #49 (LP GAS ONLY)
49 70408 1 GASKET, MANIFOLD PIPE
50 121388 4 SCREW, #10 X 1/2
51 170924 1 MANIFOLD PIPE
52 160832 1 VALVE USE 161078
52 161078 1 VALVE USE 161123
52 161123 1 GAS VALVE 3/8 X 1/8
53 62571 1 BRACKET, VALVE MOUNTING
54 120158 2 SCREW, #8 X 3/8
55 170012 1 ELBOW,STREET 90 DEGREE USE 171427
55 171427 1 ELBOW, STREET
60 160740 1 VALVE, SHUTOFF

4. Motor, blower and combustion air

Suburban NT42T blower and motor exploded parts illustration 4
Illustration 4 of four. Use the callout to identify its manufacturer service number.
Reference Manufacturer part number Quantity Component description
61 350098 1 WHEEL ROOM AIR
62 121252 4 SCREW 10 X 3/8 PH PH
63 390384 1 BLOWER HOUSING ASSEMBLY
64 121227 3 SCREW,10-24 X 1/2
65 230509 1 MICRO SWITCH & PADDLE USE 233356
65 233356 1 MICRO SWITCH & PADDLE
65 525024 1 SERVICE KIT, SAIL SWITCH
66 121247 2 SCREW, 2-56 X 5/8 HEX
68 121661 2 FASTENER TINNERMAN #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 231208 1 MOTOR ASSY USE 521138
75 521138 1 MOTOR NT34 M,S,SP NT40
76 70384 1 GASKET, MOTOR MOUNT
77 390179 1 HOUSING COMBUSTION AIR ASSY
78 121436 3 SCREW #10-16 X 1/2
79 350077 1 WHEEL COMB AIR
80 121436 3 SCREW #10-16 X 1/2
81 70386 1 GASKET, COMBUSTION AIR
82 390424 1 HOUSING, COMBUSTION AIR (OUTSIDE)
83 120615 9 SCREW 8 X 1/2 PH PH
83A 121712 1 BOLT, TINNERMAN

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