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


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HW
HW
HW
77951 85688 99593 78469 78468
WIRE TERMINALS USED WITH ITEM 62
COIL HIGH LIMIT ASSEMBLY
Item Parts Description HW 300 HW 399/420 HW 520 HW670
1.......... Base, Assembly ................................................76195-700 ..........76193-700.......... 76193-700 ......... 76193-700
2.......... Box, Junction ...................................................... 190616-4 ............190616-4............ 190616-4 ........... 190616-4
3.......... Bracket, Gas Control String ..................................93764 ................. 93764 ................. 93764................. 93764
4.......... Bracket, Pilot (At Main Gas Burner) ......................190424 ............... 190424 ............... 190424...............190424
5.......... Bracket, Shield .....................................................190473 ............... 190473 ............... 190473............... 190473
6.......... Burner, Main: Sea Level
.......... Natural Gas....................................................98593-20 .............98593-2............. 98593-21 ............ 98593-4
.......... Propane Gas ..................................................98593-1 ..............98593-3............. 98593-22 ............ 98593-5
7.......... Burner, Pilot (With Orifice):
.......... Natural Gas......................................................210871 ............... 210871 ............... 210871...............210871
.......... Propane Gas .................................................210871-1 ............210871-1............ 210871-1 ........... 210871-1
9.......... Bushing, Snap.......................................................98863 ................. 98863 ................. 98863.................98863
10.......... Cap, Terminal End ................................................98206 ................. 98206 ................. 98206.................98206
11.......... Clamp, Capillary Tube ..........................................94998 ................. 94998 ................. 94998................. 94998
12.......... Clamp, Tubing.......................................................68903 ................. 68903 ................. 68903................. 68903
13.......... Clip, Retainer ........................................................92979 ................. 92979 ................. 92979................. 92979
14.......... Coil, Combustion Chamber..................................97485 ................. 97486 ................. 99267................. 99267
15.......... Collector, Flue (Series 100) ..............................190285-10 .... 212037/212037-1 ....... 212035............. 190286-1
Collector, Flue (Series 101) ...............................190285-1 .....212037/212037-1 ....... 212035...............190286
16.......... Control, Intermittent Ignition:
.......... Natural Gas (Series 100) .............................. 191182-2.............191182-2 ............ 191182-2 ........... 191182-2
.......... Propane Gas (Series 101) ............................ 191182-3.............191182-3 ............ 191182-3 ........... 191182-3
17.......... Control, Limit .......................................................93661-4 ..............93661-4 .............. 93661-4 ............. 93661-4
18.......... Control, Limit (Protector Switch) ......................... 77981-2 ..............77981-2.............. 77981-2 ............. 77981-2
19.......... Cover, Leg .........................................................97259-701 ..........97259-701.......... 97259-701 ......... 97259-701
20.......... Cover, Limit Control (Protector Switch) .............96667-706 ..........96667-706.......... 96667-706 ......... 96667-706
21.......... Cover, Peep Hole ...............................................1050-702 ............1050-702............ 1050-702 ........... 1050-702
22.......... Cover, Top .......................................................... 96096-709 ..........96096-701.......... 96378-702 ......... 96378-701
23.......... *Decals:
.......... ASHRAE ...........................................................191857 ............... 191857 ............... 191857...............191857
.......... California ..........................................................42985 ................. 42985 ................. 42985................. 42985
.......... Clearance — Models HW-300, 399 .............. 190022-1 ............190022-2................ - - - -................... - - - -
.......... Clearance — Models HW-420, 520 & 670 ........ - - - - .................. 76982 ................. 76982................. 76982
.......... Flammable Vapors/Scald ................................192872 ............... 192872 ............... 192872...............192872
.......... Lighting & Operating ........................................191367 ............... 191367 ............... 191367...............191367
.......... M.E.A. .............................................................42929-22 ............42929-22............ 42929-23 ........... 42929-22
.......... Pilot 77860 ......................................................77860 ................. 77860 ................. 77860
.......... Protector............................................................97315 ................. 97315 ................. 97315................. 97315
.......... Warning............................................................190230 ............... 190230 ............... 190230...............190230
.......... Water Inlet .........................................................94518 ................. 94518 ................. 94518................. 94518
.......... Water Outlet ......................................................94519 ................. 94519 ................. 94519................. 94519
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
ROBERTSHAW GAS VALVE
59
3
72
72
72
72
67
24
38
PILOT ASSEMBLY
48
7
5
64
63
43
4
58
71
72
72
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