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Directory: Catalog > Water
Heaters > A.O. Smith > Parts
Parts List: A.O. Smith LB-750, LW-750; Series 920/951
- Use the chart to find the part you need to order. A diagram of the unit is below the chart to assist you in locating your part.
- Click on the underlined link to go directly to the part's page for pricing and ordering.
- For parts that are not underlined and do not have a link, please Contact Us for price and availability.
- The manufacturer has changed some part numbers to a new part number, and we have referenced the new part number in the chart (if applicable). Please note that the manufacturer may change part numbers and availability at any time.
- You can download and print the original PDF of the A.O. Smith parts list at the bottom of the page.
By-Pass Kit Parts List:
| Item |
Description |
LW/LB-750
Series 920, 951 |
| 1 |
Ball Valve |
191935 |
| 2 |
Hex Reducing Bushing (for use with relief valve): |
|
| |
- LW Models |
91940-1 (new # 091940-001) |
| |
- LB Models |
91940-8 |
| 3 |
Relief Valve: |
|
| |
- LW Models |
98883-3 (new # 098883-003) |
| |
- LB Models |
98883-2 (new # 210451-002) |
| 4 |
Tee (for use with relief valve): |
|
| |
- LW Models |
78685-2 |
| |
- LB Models |
78685-5 |
| 5 |
Tee, 2 in. |
191584 (new # 191584-000) |
| 6 |
Tee, 2 x 2 x 3/4 in. |
078685-4 (new # 078685-004) |
| 7 |
Valve, Drain |
26273 (no longer available) |
| 8 |
Valve, Manual Shutoff |
003423-3 (new # 003423-003) |
| 9* |
Control, Tank Temperature (LW Models) |
099058-1 |
| 10* |
Orifice, Gas Assembly (See Orifice Table) |
|
| 11 |
Vent Patch Assembly |
192161 (new # 9005283205) |
| 12* |
Strap Cable |
099592-2 |
| 13 |
Tee, Condensate |
192040-1 (new # 192040-001) |
NOTES:
- The manufacturer may change part numbers and availability at any time.
* Not shown
** On LB models the circulating pump must be installed between the boiler inlet and the bypass. LW models have the pump mounted inside the jacket.
|
Parts List A:
| Item |
Description |
LB/LW-750 |
| 1 |
Bracket, Cover |
191602 |
| 2 |
Burner and Cone Assembly |
191850-1 |
| 3 |
Bushing, Temp. Sensing |
191908 |
| 4 |
Combustion Chamber Assembly |
191529-1 (new # 9005275205) |
| 5 |
Connector, Hose |
191765 (new # 191765-000) |
| 6 |
Control, Dual Limit (for LB) |
191671 (no longer available) |
| 7 |
Control, Dual Limit (for LW) |
191671-1 (no longer available) |
| 8 |
Coupling, Flexible with Gasket |
191780 (new # 191780-000) |
| 9 |
Cover |
191548 |
| 10 |
Gasket, Outer |
191563-1 (new # 9005679205) |
| 11 |
Gasket, Plate Assembly |
191564-1 |
| 12 |
Gasket, Inner |
191563 (new # 9005679205) |
| 13 |
Housing Assembly |
191627-2 (no longer available) |
| 14 |
Igniter |
191526 (new # 9006101205) |
| 15 |
Insulation, Burner |
191618 (new # 191618-000) |
| 16 |
Nut, Manifold |
191555 |
| 17 |
O-Ring |
191556 (new # 191556-000) |
| 18 |
Power Supply, Temperature Indicator |
191905 (new # 9005996105) |
| 19 |
Screw, Machine #8-32 SST |
191770 (new # 191770-000) |
| 20 |
Sealer, Silicone |
191482-1 (new # 191482-001) |
| 20A |
Sensor, Temperature with Temperature Indicator |
191910 (new # 9005997105) |
| 21 |
Spacer, Ring |
191554 (new # 191554-000) |
| 22 |
Switch, Safety Flow |
78168 (new # 9005680205) |
| 23 |
Tee, Reducing |
191583 |
| 24 |
Tube Assembly, Outlet |
191589 (new # 9005124205) |
| 25 |
Tube Assembly, Primary (LW Models) |
191688 |
| 25 |
Tube Assembly, Primary (LB Models) |
191987 (new # 191987-000) |
| 26 |
Tube Assembly, Secondary (LW Models) |
191588 (new # 9005123205) |
| 26 |
Tube Assembly, Secondary (LB Models) |
191588-1 (No Longer Available) |
| 27 |
Washer, Flat #8 SST |
191768 (new # 191768-000) |
| 28 |
Well, Temperature Sensor |
191907 (new # 191907-000) |
| 29 |
Restrictor, Air-Top Cover |
191926-1 (new # 9005809215) |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Parts List B:
| Item |
Description |
LB/LW-750 |
| 1 |
Bolt, Machine 5/16 in. - 18 in. |
191358-1 |
| 2 |
Box, 4 x 4 in. Junction |
191970-1 |
| 3 |
Bracket Assembly, Front |
191603 |
| 4 |
Bracket, Dia-Scan |
191756 |
| 5 |
Control, Blower Speed |
191922 (new # 191922-000) |
| 6 |
Cover, Top |
191609 (no longer available) |
| 7 |
Dia-Scan Assembly |
191815 |
| 8 |
Fastener |
191813 |
| 9 |
Frame Assembly |
191577 |
| 10 |
Handle, Lower Front Panel |
191802 (new # 191802-000) |
| 11 |
Indicator, Temperature |
191910 (new # 9005997105) |
| 12 |
|
191852 (new # 210561-000) |
| 13 |
Locknut, Star |
1953 (new # 001953-000) |
| 14 |
Nipple, Chase |
41994 |
| 15 |
Nut, Hex (6-32) |
191936 |
| 16 |
Nut, Hex #8-32 |
41284-1 (new # 041284-001) |
| 17 |
Overlay, On/Off |
191799 |
| 18 |
Panel, Left Side |
191796-1 (new # 9005128205) |
| 19 |
Panel, Lower Front |
191805 (new # 9005277205) |
| 20 |
Panel, Rear |
191748-1 (new # 9005126205) |
| 21 |
Panel, Right Side |
191796 (new # 9005127205) |
| 22 |
Panel, Upper Front |
191806 (No Longer Available) |
| 23 |
Plate, Junction Box Cover |
191971 |
| 24 |
Plate, On/Off |
191800 |
| 25 |
Power Suuply, Temperature Indicator |
191905 (new # 9005996105) |
| 26 |
Relay, Blower Speed |
191661 (new # 9004481215) |
| 27 |
Screw, Flat Head #4 |
191906 |
| 28 |
Screw, Machine (6-32) |
191937 |
| 29 |
Switch, Rocker |
191665 (new # 9004484215) |
| 30 |
Trim |
191810 |
| 31 |
Washer, Lock 5/16 in. |
191480 |
| 32 |
Washer, Lock #8 |
3347-1 |
| 33 |
Washer, Lock #6 |
3347-2 |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Parts List C:
| Item |
Description |
LB/LW-750 |
| 1 |
Clamp, Hose (Large) |
191794-1 (new # 191794-001) |
| 2 |
Clamp, Hose (Small) |
191794 (new # 191794-000) |
| 3 |
Connector, Female Bulkhead |
191744 (new # 191744-000) |
| 4 |
Connector, Port |
191745 (new # 191745-000) |
| 5 |
Drain, Flange |
191620 (no longer available) |
| 6 |
Drain, Flange Assembly |
191625 |
| 7 |
Elbow |
191664 (new # 191664-000) |
| 8 |
Gaskt, Blocked Flue |
191767 (new # 191767-000) |
| 9 |
Gasket, Drain |
191622 |
| 10 |
Gasket, Vent |
191683 |
| 11 |
Nipple |
20373-15 (no longer available) |
| 12 |
Nut, Hex 1/4 in. |
170272 (new # 170272-000) |
| 13 |
Nut, Hex 1/4 in. Stainless |
191769 (new # 191769-000) |
| 14 |
O-Ring |
191556-1 (new #191556-001) |
| 15 |
Plate, Drain Seal |
191626 (new # 191626-000) |
| 16 |
Pump Assembly, Circulator (LW Models only) |
191552-1 (new # 9004632205) |
| 17 |
Screw, Cap 1/4 in. |
190960 |
| 18 |
Tube Assembly, Inlet |
191587 |
| 19 |
Tube Assembly, Primary (LW models) |
191688 |
| 19 |
Tube Assembly, Primary (LB models) |
191987 (new # 191987-000) |
| 20 |
Tubing, Condensate |
191746 (new # 9004490215) |
| 21 |
Tubing, Pressure |
191562 (new # 191556-002) |
| 22 |
U-Bolt Assembly |
191938 |
| 23 |
Valve, Drain |
26273 (no longer available) |
| 24 |
Vent, Assembly |
191687 (new # 191687-000) |
| 25 |
Vent, Flange |
191685 (No Longer Available) |
| 26 |
Vent, Flange Assembly |
191686 (No Longer Available) |
| 27 |
Vent, Restricting Ring |
191923 (new # 191923-000) |
| 28 |
Washer, Flat |
191766 |
| 29 |
Washer, Lock 1/4 in. |
1006 (new # 001006-000) |
| 30 |
Washer, Lock 1/4 in. Stainless |
191771 (new # 191771-000) |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Parts List D:
| Item |
Description |
LB/LW-750 |
| 1 |
Blower |
191652-1 (new # 9005371205) |
| 2 |
Blower Adapter Assembly |
191645-1 (no longer available) |
| 3 |
Blower Manifold Assembly |
191832 (new part # 191832-000) |
| 4 |
Bracket, Blower |
191773 |
| 5 |
Clamp, Hose |
191794 (new # 191794-000) |
| 6 |
Elbow, 1 in. |
1630 |
| 7 |
Elbow, Union 1 in. |
2482-1 (no longer available) |
| 8 |
Elbow, Street 1 in. |
190763 |
| 8A |
Elbow, Street 1 in. Tapped |
190763-2 |
| 8B |
Elbow, Street 1/8 in. 45° |
192046 |
| 9 |
Flange, Observation Port |
191573 (new # 191573-000) |
| 10 |
Gasket, Blower |
191623 (new # 191623-000) |
| 11 |
Gasket, Burner |
191564 (new # 191564-000) |
| 12 |
Gasket, Manifold |
191565 (no longer available) |
| 13 |
Gasket, Port (1/8 in. Thick) |
191576-1 |
| 14 |
Gasket, Port (1/16 in. Thick) |
191576 (new # 191576-000) |
| 15 |
Manifold Assembly |
191610 |
| 16 |
Nipple, Close 1/8 in. |
191147-1 (new part # 191147-001) |
| 17 |
Nipple, Close Stainless |
191772 (new # 191772-000) |
| 18 |
Nipple Tapped |
----- |
| 19 |
Nipple, 1 in. x 9-1/2 in. |
86397 |
| 20 |
Nipple, 1 in. x 2 in. |
1177 (new # 001177-000) |
| 20A |
Nipple, 1 in. x 7 in. |
086397-1 |
| 20B |
Nipple, 1 in. x 14-1/2 in. |
086397-6 |
| 20C |
Nipple, 1 in. x 3 in. |
086397-12 |
| 21 |
Nut, Hex 1/4 in. |
170272 (new # 170272-000) |
| 22 |
Orifice, Air |
191903-1 |
| 23 |
Orifice, Union - See Orifice Table |
|
| 24 |
Plug, 1/8 in. Pipe |
3348 (new # 003348-000) |
| 25 |
Port, Observation Lower |
191572 (new # 191572-000) |
| 26 |
Port, Observation Upper |
191572-1 (new # 191572-001) |
| 27 |
Screen, Air Inlet |
192041 (new # 192041-000) |
| 28 |
Screw, Cap 1/4 in. |
190960 |
| 29 |
Screw, Flathead #8-32 x 1/2 in. |
191542 |
| 30 |
Screw, Flathead #8-32 x 3/4 in. |
191542-1 |
| 31 |
Switch, Low Pressure |
191149-1 (new # 9003301205) |
| 32 |
Switch, Restricted Flow |
191076 |
| 33 |
Tee, 1/8 in. |
40119 (new # 040119-000) |
| 34 |
Tee, Union |
191633 (new # 191633-000) |
| 35 |
Tubing, Pressure |
191562 (new # 191556-002) |
| 37 |
U-Bolt Assembly |
191938-1 |
| 37A |
Union, 1 in. |
095515-2 |
| 38 |
Valve, Main Gas |
078481-2 |
| 39 |
Washer, Lock 1/4 in. |
1006 (new # 001006-000) |
| 40 |
Valve, Solenoid Gas |
191322 (new # 9004978105) |
| 41 |
Bushing, Face, 1 in. x 1-1/4 in. |
----- |
| 42 |
Nipple, 1 in. x 2-1/2 in. |
1179 |
| 43 |
Nipple, 1 in. x 4 in. |
86397-7 |
| 44 |
Nipple with Tap, 1-1/4 in. x 2 in. |
----- |
| 45 |
Nipple, 1 in. Close |
----- |
| 46 |
Nipple with Tap, 1 in. x 15-1/2 in. |
----- |
| 47 |
Nipple with Tap, 1 in. x 5 in. |
----- |
| 48 |
Plug, Pipe, 1/8 in. NPT |
----- |
| 49 |
Valve, Manual Shut-Off |
3423-4 (new # 003423-004) |
| 50 |
Valve, Solenoid |
192189 (new # 192189-000) |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Parts List E, LB/LW-750 Series 951 Propane:
| Item |
Description |
LB-LW-750 |
| 1 |
Valve, Main Gas, LP 951 Series |
077780-0 |
| 2 |
Regulator, Propane, 951 Series |
192460 |
| 3 |
Valve, Manual Shut-Off |
3423-3 (new # 211694-000) |
| 4 |
Switch, Restricted Flow |
191076 |
| 5 |
Switch, Low Pressure |
191149-3 (new # 9003301205) |
| 6 |
Nipple, 1-1/4 in. |
86505-2 (new # 086505-002) |
| 7 |
Nipple, 1-1/4 in. |
86505-10 |
| 8 |
Elbow, Union 1-1/4 in. |
86506 (new # 086506-000) |
| 9 |
Elbow, 90° Street 1-1/4 in. |
94516 (new # 094516-000) |
| 10 |
Bushing, Face 1 x 1-1/4 in. |
99376 (new # 099376-000) |
| 11 |
Elbow, 90° 1-1/4 in. |
99376 (new # 099376-000) |
| 12 |
Nipple, 1 in. |
86397 |
| 13 |
Nipple, 1-1/4 in. |
86505-3 |
| 14 |
Nipple, 1-1/4 in. |
86505-8 |
| 15 |
Nipple, 1-1/4 in. |
86505-4 |
| 16 |
Nipple, 1-1/4 in. |
86505-16 |
| 17 |
Tee, 1/8 in. NPT Branch |
192465 |
| 18 |
Connector, Angle 1/8 in. |
1578 (new # 001578-000) |
| 19 |
Bleeder, Tube |
210016 |
| 20 |
Bleeder, Tube |
192461 |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Parts List F:
| Item |
Description |
LB/LW-750 |
| 1 |
Block, Terminal (4 Required) |
98205 (new # 098205-000) |
| 2 |
Box, 4 in. x 4 in. Junction |
93558-4 (new # 9005076205) |
| 3 |
Bushing, Snap (Large 1-1/8 in. Hole) |
191078 |
| 4 |
Bushing, Snap (Small 7/8 in. Hole) |
98863 (new # 098863-000) |
| 5 |
Cabinet with Cover |
191561 (new # 191561-000) |
| 6 |
Control, Hot Surface Ignition |
191848 (new # 9004492005) |
| 7 |
End Cap, Terminal |
98206 (new # 098206-000) |
| 8 |
Fuse, 2 Amp |
191842 (new # 191842-000) |
| 9 |
Fuse, 10 Amp |
191842-1 (new # 191842-001) |
| 10 |
Holder, Fuse |
191843 (new part # 191843-000) |
| 11 |
Lucknet, Star |
1953 (new # 001953-000) |
| 12 |
Marker, Terminal Strip No. 1-6 |
191657 |
| 13 |
Marker, Terminal Strip No. 7-12 |
191657-1 |
| 14 |
Module, Interface Assembly |
191757 (new # 9007119005) |
| 15 |
Nipple, Chase |
41994 |
| 16 |
Nut, Hex #10 |
7207 |
| 17 |
Panel Assembly |
191678 |
| 19 |
Relay, D.P.S.T. (120 Vac) |
191880 (new # 191880-000) |
| 20 |
Retainer, Wire |
39884 |
| 21 |
Screw, Thread Cut #* x 1/ 4 in. |
96902 |
| 22 |
Screw, thread Cut #8 x 3/8 in. |
20107 |
| 23 |
Screw, Thread Cut #8 x 5/8 in. |
20107-3 (no longer available) |
| 24 |
Screw #10, Ground |
39885-1 |
| 25 |
Spacer, Unified |
191946 |
| 26 |
Strip, Terminal |
191656 (new # 191656-000) |
| 27 |
Switch, Blocked Flue |
191667 (new # 9005686205) |
| 28 |
Switch, Blower Prover Switch |
191666 (new # 9005913205) |
| 29 |
Tab Cap Terminal |
170053 (new # 170053-000) |
| 30 |
Transformer, 40 VA |
99238 (new # 9005916205) |
| 30 |
Transformer, 75 VA (Canada only) |
192528 (new # 190021-000) |
| 31 |
Tubing, Pressure |
191562 (new # 191556-002) |
| 32 |
Washer, Lock # 10 |
3347 |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Orifice Table:
| Model |
Natural Gas
Part #
|
Propane
Part # |
Size (in.) |
Elevation (ft.) |
| LW/LB-750 (USA) |
*191884-3 (new # 191884-003) |
|
0.484 |
0-2000 |
| LW/LB-750 (USA) |
191884-5 |
|
0.469 |
2001-3000 |
| LW/LB-750 (USA) |
191884-7 (new # 191884-007) |
|
0.461 |
3001-4000 |
| |
|
|
|
|
| LW/LB-750 |
|
*192741-3 |
0.286 |
0-2000 |
| LW/LB-750 |
|
192741-4 |
0.282 |
2001-3000 |
| LW/LB-750 |
|
192741-5 |
0.278 |
3001-4000 |
NOTES:
- The manufacturer may change part numbers and availability at any time.
* Factory installed orifice
|
Wire (Solid Colors):
| Wire |
Gauge |
Part No. + |
| White |
18 |
170595 170595-000: Wire - White #18 GA. Stranded |
| Black |
18 |
170596 170596-000: Wire Black #18 Stranded |
| Brown |
18 |
170890 170890-000: Wire Assembly (new part # 9004523215) |
| Yellow |
18 |
170604 |
| Red |
18 |
170603 170603-000: Wire Red #18 Stranded |
| Green |
14 |
041972 041972-000: Wire #14 Green Stranded 1 FT Long |
| White |
16 |
086580 (new # 086580-000) |
| Black |
16 |
086578 |
| White |
14 |
041974 |
| Black |
14 |
099650 |
| Blue |
18 |
191719 |
NOTES:
- The manufacturer may change part numbers and availability at any time.
+ Use dash no. after part no. to indicate length of wire required in inches. For example, part no. 041972-020 equals #14 gauge Green, 20 in. length.
|
Wire (Striped Colors, #18 Gauge):
| Wire |
Part No. + |
| Black with White |
191694 |
| Black with Red |
191695 |
| Black with Yellow |
191696 |
| Black with Blue |
191697 |
| Black with Green |
191698 |
| White with Black |
191699 |
| White with Red |
191700 |
| White with Green |
191701 |
| White with Yellow |
191702 |
| White with Brown |
191703 |
| White with Blue |
191704 |
| White with Violet |
191705 |
| Yellow with Red |
191706 |
| Yellow with Black |
191707 |
| Yellow with Blue |
191708 |
| Yellow with Violet |
191709 |
| Yellow with Brown |
191710 |
| Yellow with Green |
191711 |
| Blue with Red |
191712 |
| Blue with White |
191713 |
| Blue with Yellow |
191714 |
| Red with Yellow |
191715 |
| Red with White |
191716 |
| Red with Green |
191717 |
| Red with Blue |
191718 |
NOTES:
- The manufacturer may change part numbers and availability at any time.
+ Use dash no. after part no. to indicate length of wire required in inches. For example, part no. 041972-020 equals #14 gauge Green, 20 in. length. |
Download original AO Smith Parts List
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