A. O. Smith HW-420 Parts List
PSD-3-140/D
COMMERCIAL WATER HEATER
REPLACEMENT PARTS LIST
MODELS HW 300 THRU HW 670:
SERIES 932/933
INTERMITTENT
IGNITION CONTROL
A.O. SMITH WATER PRODUCTS CO., INC.
5621 W. 115TH STREET • ALSIP, ILLINOIS 60803
PHONE: 1-800-433-2545 • FAX: 1-800-433-2515
Website : www.hotwater.com/parts
PRINTED IN U.S.A. 0601 2277 192358-000 REV.05
ROBERTSHAW
GAS VALVE
COIL HIGH LIMIT
ASSEMBLY
WIRE TERMINALS USED WITH ITEM 62
PILOT BURNER
77951 85688 99593 78469 78468
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 .................................................... 210871-0 ............ 210871-0 ............ 210871-0 ........... 210871-0
.......... 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 ................................................... 190285-10 .... 190285-1/190285 ..... 190285-5 ............. 190286
16 .......... Control, Intermittent Ignition:
.......... Natural Gas (Series 932) ................................191182 ............... 191182 ................ 191182 ............... 191182
.......... Propane Gas (Series 933) ............................ 191182-1 ............. 191182-1 ............ 191182-1 ........... 191182-1
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
HWHW
HW
HWHW
HWHW
HW
HWHW
ASSEMBLY
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