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

  • Links are included to the parts that are available to be purchased.
  • Parts that are not listed in the chart are either discontinued by AO Smith or are not available for purchase.
  • The item number in the first column corresponds to the location of the part in the line art drawing below the chart.

 

Waterways and Combustion Chamber Parts List:

Item Description
LB/LW-750
Series 300/301
5 Coupling, Flexible with Gasket 191780 (new # 100050119)
11 Ignitor 192334 (new # 100110899)
15 Probe, Outlet Temp/ECO 210572 (new # 100110742)
16 Probe, Inlet Temp 210571 (new # 100110747)
20 Sensor, Flame 210421 (new # 100110707)
21 Spacer Ring 191554 (new # 100049869)
22 Switch, Safety Flow 211480 (new # 100110588)
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.

 

 

 

Jacket/Frame Assembly:

Item Description
LB/LW-750
Series 300/301
23 Switch, Blower Prover 191666 (new # 100110729)
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
3 Blower Manifold Assembly 191832 (new # 100110799)
25+ Port, Obersation Lower 191572 (new # 100049889)
31 Switch, Low Pressure 191149-1 (new # 100109151)
38 Valve, Main Gas 78481-3 (new # 100110223)
+ Not Illustrated.

 

 

Train Assembly, Propane:

Item Description
LB/LW-750
Propane
5 Switch, Low Gas Pressure 191149-3 (new # 100109151)

 

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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