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Parts List: A.O. Smith LB-750, LW-750; Series 400/401

  • 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 & Combustion Chamber Parts List:

Item Description LB/LW-750
Series 400/401
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.
+ Not Illustrated

 

 

Exhaust, Drain & Water Inlet Assembly Parts List:

Item Description LB/LW-750
7 Elbow 191664 (new # 100049989)
9 Gasket, Drain 211895 (new # 100063510)
14 Sleeve 212018 (new # 100063671)
15 Pump Assembly, Circulator (LW models) 211612 (new # 100112020)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

Jacket/Frame Assembly:

Item Description LB/LW-750
3 Display Board (LB models) 210219-000 (new # 100109984)
  Display Board (LW models) 210219-001 (new # 100110978)
23 Switch, Blower Motor 191666 (new # 100110729)
25 Switch, Rocker 191665-1 (new # 100109882)
31 Switch, Relay 211546 (new # 100111329)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

Natural Gas Train / Blower Assembly Model 750:

Item Description LB/LW-750
1 Blower 191652-1 (new # 100110437)
3 Blower Manifold Assembly 191832 (new # 100110799)
9* Flange, Observation Port 191573 (new # 100049891)
10 Gasket, Blower 191623 (new # 100049963)
25+ Port, Observation Lower 191572 (new # 100049889)
26+ Port, Observation Upper 191572-1 (new # 100049890)
31 Switch, Low Pressure 191149-1 (new # 100109151)
38 Valve, Main Gas 78481-3 (new # 100110223)
40 Valve, Solenoid Gas 192189 (new # 100050419)
NOTES:
- The manufacturer may change part numbers and availability at any time.
+ Not Illustrated

 

 

 

 

Propane Gas Train Assembly - Model 750:

Item Description LB/LW-750
3 Valve, Manual Shut-Off 3423-3 (new # 100110076)
5 Switch, Low Gas Pressure 191149-3 (new # 100109151)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

Propane By-Pass Parts List Model 750:

Item Description LB/LW-750
3 Relief Valve:  
  - LB Model 210451-1 (new # 100111922)
8+ Valve, Manual Shutoff 3423-3 (new # 100110076)
10+ Tube, Condensate 191746-120 (new # 100109886)
NOTES:
- The manufacturer may change part numbers and availability at any time.
+ Not Illustrated

 

 

 

 

Wiring Harness Assembly:

Description  
Pressure Flow Switch Harness Assembly 210576 (new # 100061275)
Transformer Harness Assembly:  
- Model 1000 210578 (new # 100109200)
Outlet Temperature Control / ECO Assembly 210572 (new # 100110742)
Tank Probe (LW Model) 211541-1 (new # 100109985)
Inlet Temperature Control Assembly 210571 (new # 100110747)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

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