Suburban NT34MMD Furnace Exploded Parts Reference

The NT34MMD furnace service drawings identify cabinet and duct details, ignition and chamber items, gas controls, and blower assemblies in four distinct sections.

Select a linked part number for product details and availability. Check the furnace model and serial-number range, and confirm the quantity needed for your repair.

1. Cabinet and wiring

Suburban NT34MMD cabinet and harness service parts diagram 1
Illustrated group 1 of 4 — match the drawing callout to the numbered list.
Reference Manufacturer part number Component details
1 100950 CABINET ASSEMBLY
2 121378 TINNERMAN U TYPE
3 62164 BOTTOM DUCT GASKET
4 70546 FELT SEAL (VERTICAL)
5 121224 SCREW, #10 X 3/4
6 100808 CABINET FRONT
6A 100949 CABINET DOOR ASM.
7 70547 FELT SEAL (HORIZONTAL)
8 121252 SCREW 10 X 3/8 PH PH
9 70534 GASKET DISC COVER
10 62408 DISC COVER, GAS INLET
11 520322 POWER SUPPLY HARNESS
12 160813 THERMOSTAT
13 50296 DUCT COLLAR

2. Ignition and combustion

Suburban NT34MMD electrode and ignition service parts diagram 2
Illustrated group 2 of 4 — match the drawing callout to the numbered list.
Reference Manufacturer part number Component details
14 121460 SCREW, BURNER MOUNTING #10-24 X 3/8
15 120158 SCREW, #8 X 3/8
16 121388 SCREW, #10 X 1/2
17 290119 COVER, AIR ADJUSTMENT HOLE
18 70389 GASKET, AIR ADJUSTMENT HOLE COVER
19 230590 ELECTRODE USE 520733
19 520733 ELECTRODE KIT - NLA
NS 230491 WIRE, ELECTRODE
20 70163 GASKET, ELECTRODE USE 071076
20 71076 BURNER/ELECTRODE GASKET SET USE 72103
20 72103 GASKET KIT, BURNER /ELECTRODE
21 121387 SCREW 8-32 X 1/2 SLOT HEX SELF-TAP
22 230173 GROUND STRAP
23 30451 BURNER ACCESS DOOR
NS Z030506 BURNER ACCESS DOOR ASM
24 120158 SCREW, #8 X 3/8
25 310026 DISC, OBSERVATION GLASS
26 290120 OBSERVATION HOLE COVER
27 70398 GASKET, BURNER ACCESS DOOR
28 X020786 COMBUSTION CHAMBER
29 120158 SCREW, #8 X 3/8
30 230612 LIMIT SWITCH
31 230362 BUSHING
32 70538 INSULATOR, MODULE BOARD
33 230587 MODULE BOARD USE 520741
33 520741 MODULE BOARD, WAS SUPERCEEDED BY 520820. USE 521099
33 521099 IGNITION CONTROL MODULE
34 120744 NUT 6-32 HEX
35 70549 INSULATOR CAP
36 121252 SCREW 10 X 3/8 PH PH
37 230530 RELAY, THERMOSTAT
38 62135 BRACKET, POWER SUPPLY
39 121252 SCREW 10 X 3/8 PH PH
40 230575 FAN SWITCH
41 121252 SCREW 10 X 3/8 PH PH
42 20270 BUSHING
43 X110426 RADIATION SHIELD ASSEMBLY
44 40293 BAFFLE, EXHAUST TUBE
45 121436 SCREW #10-16 X 1/2
46 121224 SCREW, #10 X 3/4
47 121256 SCREW #8 X 3 1/4
48 260093 260093 VENT CAP ASSY (260164)

3. Burner and gas system

Suburban NT34MMD burner and gas service parts diagram 3
Illustrated group 3 of 4 — match the drawing callout to the numbered list.
Reference Manufacturer part number Component details
52 170082 ELBOW 90 DEG X 3/8 NPT
53 70432 GASKET, GAS INLET
54 121252 SCREW 10 X 3/8 PH PH
55 62143 PLATE COVER, GAS INLET
56 121388 SCREW, #10 X 1/2
57 X170566 GAS INLET PIPE ASSEMBLY
58 160781 VALVE, FENWALL
59 X170597 MANIFOLD PIPE ASSEMBLY
59A 170546 FITTING REDUCER 1/8 X 3/4
59B 170628 LONG COUPLING 1/8 X 3/4
NS Z170641 MANIFOLD & VALVE ASSEMBLY
60 121388 SCREW, #10 X 1/2
61 180222 ORIFICE #51
62 70408 GASKET, MANIFOLD PIPE
63 10582 SHUTTER, BURNER AIR
64 121398 PIN, ROLL 5/32 X 1
65 150026 SPRING
66 120684 WASHER, 7/32 X 1/2
67 10581 BURNER
NS Z010609 BURNER ASSEMBLY
69 121250 PIN, ROLL 1/4 X 3/32

4. Blower and motor

Suburban NT34MMD blower and motor service parts diagram 4
Illustrated group 4 of 4 — match the drawing callout to the numbered list.
Reference Manufacturer part number Component details
70 350076 WHEEL, ROOM AIR USE 350113
70 350113 WHEEL, BLOWER METAL
71 121252 SCREW 10 X 3/8 PH PH
72 X390269 ROOM AIR BLOWER HOUSING
73 Z230748 MICROSWITCH ASM WITH WIRING
74 121247 SCREW, 2-56 X 5/8 HEX
75 121364 WASHER, LOCK #2
76 120672 NUT, HEX #2 -56
77 121227 SCREW,10-24 X 1/2
78 121388 SCREW, #10 X 1/2
79 62138 BRACKET, MOTOR MOUNTING -NLA
80 120717 NUT, HEX # 10-24 KEPS
81 230774 MOTOR
82 70384 GASKET, MOTOR MOUNT
83 390179 HOUSING COMBUSTION AIR ASSY
84 121436 SCREW #10-16 X 1/2
85 121436 SCREW #10-16 X 1/2
86 350077 WHEEL COMB AIR
87 70386 GASKET, COMBUSTION AIR
88 390173 HOUSING, COMBUSTION AIR BLOWER (OUTSIDE)
89 121252 SCREW 10 X 3/8 PH PH
90 70385 GASKET, CROSSOVER TUBE
91 50439 CROSSOVER TUBE
92 121388 SCREW, #10 X 1/2
NS 160740 VALVE, SHUTOFF
NS 230297 230297 RECIFER DIODE
NS 230255 230255 AC/DC RELAY
NS 230323 TRANSFORMER

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