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Parts List: A.O. Smith LB-750, LW-750, Series 300/301

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  • You can download and print the original PDF of the A.O. Smith parts list at the bottom of the page.

 

Waterways and Combustion Chamber Parts List:

Item Description
LB/LW-750
Series 300/301
2 Burner and Cone Assembly 191850-1 (new # 100062891)
3 Combustion Chamber Assembly 191529-3 (new # 100110370)
5 Coupling, Flexible with Gasket 191780 (new # 100050119)
6 Cover, Outer 210408 (new # 100061058)
7 Gasket, Outer 211594-1 (new # 100110587)
8 Gasker, Burner 191564-1 (new # 100110592)
9 Gasker, Inner 211594 (new # 100110587)
10 Housing Assembly 211742-1 (new # 100111385)
11 Ignitor 192334 (new # 100110899)
12 Insulation, Burner 191618 (new # 100049958)
14 O-Ring 191556 (new # 100049872)
15 Probe, Outlet Temp/ECO 210572 (new # 100110742)
16 Probe, Inlet Temp 210571 (new # 100110747)
19+ Sealer, Silicone Hi-Temp 191482-1 (new # 100049842)
20 Sensor, Flame 210421 (new # 100110707)
21 Spacer Ring 191554 (new # 100049869)
22 Switch, Safety Flow 211480 (new # 100110588)
27 Washer, Flat #8 SST 191768 (new # 100050105)
NOTES:
- The manufacturer may change part numbers and availability at any time.
+ Items not illustrated.
- Replacement housing assemblies (Item 10) are currently all steel type. When replacing the housing assembly, both the inner gasket (Item 9) and outer gasket (Item 7) must also be replaced. In addition, high temperature silicone sealant (Item 19) is required to fix the gaskets to the surfaces.
- The Tub Replacement Kit is available for replacing housing assemblies. When ordering, use part number 211742 for LB/LW-500 models, 211742-1 for LB/LW-750 models and 211742-2 for LB/LW-1000 models.

 

 

Exhaust, Drain and Water Inlet Assembly Parts List:

Item Description
LB/LW-750
Series 300/301
1 Clamp, Hose (Large) 191794-1 (new # 100050128)
7 Elbow 191664 (new # 100049989)
12 Nut, Hex 1/4 in. (Serrated) 210226 (new # 100060814)
13 O-Ring 191556-1 (new # 100049873)
14 Plate, Drain Seal 191626 (new # 100049965)
15 Pump Assembly, Circulator (LW Models) 211612 (new # 100112020)

 

 

Jacket/Frame Assembly:

Item Description
LB/LW-750
Series 300/301
3 Display Board 210219 (new # 100109984)
7 Handle 191802 (new # 100050134)
11 Locknut, Star 1953 (new # 100003894)
23 Switch, Blower Prover 191666 (new # 100110729)
24 Switch, Blocked Flue 191667 (new # 100110593)
25 Switch, Rocker 191665-1 (new # 100109882)
31 Switch, Relay 211546 (new # 100111329)

 

 

Train/Blower Assembly, Natural Gas:

Item Description
LB/LW-750
Series 300/301
1 Blower 211614 (new # 100110437)
3 Blower Manifold Assembly 191832 (new # 100110799)
9+ Flange, Observation Port 191573 (new # 100049891)
10 Gasket, Blower 191623 (new # 100049963)
12 Gasket, Manifold 191565 (new # 100049887)
13+ Gasket, Part (1/8 in. Thick) 191576-1 (new # 100049896)
14+ Gasket, Port (1/16 in. Thick) 191576 (new # 100049895)
16 Nipple, Close 1/8 in. 191147-1 (new # 100049693)
20C Nipple, 1 in. x Close 1342 (new # 100110144)
25+ Port, Obersation Lower 191572 (new # 100049889)
26+ Port, Observation Upper 191572-1 (new # 100049890)
30+ Screw, Flathead #8-32 x 3/4 in. 191542-1 (new # 100049865)
31 Switch, Low Pressure 191149-1 (new # 100109151)
34+ Tee, Union 191633 (new # 100049966)
35+ Tubing, Pressure 191562 (new # 100049874)
38 Valve, Main Gas 78481-3 (new # 100110223)
+ Not Illustrated.

 

 

Train Assembly, Propane:

Item Description
LB/LW-750
Propane
3 Pipe Plug 3423-3 (new # 100110076)
5 Switch, Low Gas Pressure 191149-3 (new # 100109151)
10 Elbow, 90° Street, 1-1/4 in. 94516 (new # 100029566)

 

Bypass Parts List:

Item Description
LB/LW-750
3 Relief Valve - LB model 210451-1 (new # 100111922)
3 Relief Valve - LW Model  
10+ Tube, Condensate 191746-120 (new # 100109886)
+ Not Illustrated.

 

 

 

 

Download original AO Smith Parts List
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