A.O. Smith HW 300 THRU HW 670 manual Parts Description, HW 399/420, HW670

Item	Parts Description			HW 300	HW 399/420	HW 520		HW670
	Wiring Diagram:
..........	Natural Gas			192359	192359	192359	192359
..........	Propane Gas			192360	192360	192360	192360
24	Elbow, Union With 1/8" Pressure Tap			1854	2482	86506	86506
25	Exchanger, Heat			190922	190913	190889	190889
26	Fitting, Limit Control			97570	97570	97570	97570
27	Grommet			96053	96053	96053	96053
28	Hood, Draft:
..........	Series 932		190479-700 ..		98428-707/98428-704 ....	98428-704	192256-700
..........	Series 933		190479-700 ..		98428-707/98428-704 ....	98428-704	98428-700
30	Insulation, Blanket			190175	190175-1	190175-2	190175-3
31	Insulation, Pyrofelt			190176	190177	190177	190177
32	Insulator			32779-1	32779-1	32779-1	32779-1
33	Jacket			211176	211177	211178	211178
34	Leg			96383-704	96383-701	96383-701	96383-701
35	Nut, Tie Rod			85138	85138	85138	85138
36	Nut, Wing			1995-1	1995-1	1995-1	1995-1
37	Orifice, Pilot Burner:
..........	Natural Gas			6210	6210	6210	6210
..........	Propane Gas			210913	210913	210913	210913
38	Plug, Pipe 1/8" Pressure Tap			3348	3348	3348	3348
39	Retainer, Door			190429	190429	190429	190429
40	Ring, Support			95359	85405	85405	85405
41	Rod, Tie (3 Required)			- - - -	94453-11	94453-3	94453-3
..........	Rod, Tie (2 Required)			94453-6	- - - -	- - - -	- - - -
..........	Rod, Tie (1 Required)			94453-2	- - - -	- - - -	- - - -
42	Screen, Peep Hole			1051	1051	1051	1051
43	Screw, Thumb			97288	97288	97288	97288
44	Shield, Base Radiation	..............................		96015-1	96015	96015	96015
45	Shield, Door			191119	191119	191119	191119
46	Shield, Floor			96025-1	96025	96025	96025
47	Shield, Leg			97265	97265	97265	97265
48	Shield, Pilot			170247	170247	170247	170247
49	Skirt Assembly			97260	97261	97262	97262
50	Stud, Floor Shield			96384	96384	96384	96384
51	Switch, Safety Flow
..........	(Required but not supplied with unit)			.. 211480	211480	211480	211480
52	Tape, Asbestos Free (Used with Item 40)			... 95072	95072-1	95072-1	95072-1
53	Terminal, Segment (4 Required)			98205	98205	98205	98205
54	Thermal Balancer			98190	98190	98190	98190
55	Transformer			99238	99238	99238	99238
56	Tube, Asbestos Free			68831	68831	68831	68831
57	Tube, By-Pass			96162-1	94451-3	97463	97463
58	Tubing, 1/4" x 60" Wire Assorted Fittings
..........	(User to cut to required length)			1417-60	1417-60	1417-60	1417-60
59	Valve, Gas Control:	HW
..........	Natural Gas (Series 932)			. 78450	78450-4/78450	78450	78450
..........	.................Propane Gas (Series 933)			................... ..............78450-1				78450-1
60	Valve, Relief 50 PSI			210451	210451-1	210451-1	210451-1
61	Wire, 200°C Tan with Terminals			6226	6226	6226	6226
62	*Wire, (See illustration for terminals —
..........	Order as required):
..........	16 AWG Stranded, 1050C, AWM & TEW
..........	Black			86578	86578	86578	86578
..........	Red			86579	86579	86579	86579
..........	White			86580	86580	86580	86580
..........	18 AWG Stranded, 200°C
..........	Tan			78223	78223	78223	78223
63	Wire, Ground, 250°C			170889-69	170889-69	170889-69	170889-69
64	Standard hardware items to be purchased locally.
65	Glass Yarn (4 Req’d.)			68831-2	68831-3	68831-3	68831-3
66	Glass Yarn (4 Req’d.)			68831-5	68831-4	68831-6	68831-6

*Items not illustrated.

When ordering wire, indicate length required in inches. (Example: 86578-100 equals 100" length).

Part numbers underlined are recommended stock items for emergency replacement. (Consider gas used in your area only). Request parts from PSD by giving all information such as model and series number, type of gas and specifications.

Parts List PSD-3-140/C supersedes Parts List PSD-3-140/A&B.