A.O. Smith HW 300 THRU HW 670 Water Heater User Manual


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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:
.......... Natural Gas (Series 932)......................78450 .............78450-4/78450 ............ 78450 ................ 78450
.......... Propane Gas (Series 933) ................. 78450-1 ......... 78450-5/78450-1..........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.
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