A.O. Smith 750 & 1000 Parts list
Contents
1. Iech Aje wech h h J bi a ve Lech Lech Lech fk ek Iech Iech Iech Iech fe 00 00 00 00 00 00 00 00 00 Co Use dash number to indicate length of wire Example 20 inch long red wire would be expressed as 170603 20 LB LW WIRING AND HARNESS ASSEMBLY 78468 99593 6 78469 191673 42573 210091 210152 99599 2 iB Ignition Harness Assembly 210575 Tank Probe Harness Assembly 210604 Power Harness Assembly 210579 1 Pressure Flow Switch Harness Assembly 210576 0 On 500 Models Only Gas Valve Harness Assembly 210574 1 Propane 210574 2 Nat amp Prop Model 500 Outlet Temperature Control ECO Assembly 210572 H Tank Probe LW Models 211541 1 z L E WATER PRODUCTS Csa COMPANY PSD Alsip IL Transformer Harness Assembly 210578 Model 1000 211330 Models 500 amp 750 Harness Assembly 210609 Model 1000 Inlet Temperature Control Assembly 210571 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 com2. Nipple 1 Nipple 1 8 Tee 1 8 Nipple Close Stainless Orifice Union LB LW 500 ORIFICE TABLE LB LW BY PASS PARTS LIST MODEL 500 Item Description Model 500 Ball Valve Hex Reducing Bushing LW Models for use w Relief Valve Relief valve Orifice Gas Assembly See Orifice Table Tube Condensate Strap Cable Item Not Illustrated LB LW PROPANE GAS TRAIN ASSEMBLY MODEL 750 Model 750 Item Description Valve Main Gas Nipple 1 1 4 Regulator LP Nipple 1 1 4 Valve Manual Shut Off Nipple 1 1 4 Pipe Plug Switch Low Gas Pressure Connector Angle 1 8 Nipple 1 1 4 Bleeder Tube Nipple 1 1 4 Bleeder Tube Nipple 1 1 4 Bushing 1 x 1 1 4 Elbow Union 1 1 4 Nipple Close Stainless Elbow 90 Street 1 1 4 Orifice Union Elbow 90 1 1 4 Item Description Model 750 LB LW 750 ORIFICE TABLE 3001 4000 On LB models the circulating pump must be between the boiler inlet and the bypass see figure below LW models have pump mounted inside the jacket Ball Valve Hex Reducing Bushing LW Models for use w Relief Valve Relief valve Valve Manual Shutoff Orifice Gas Assembly See Orifice Table Tube Condensate Strap Cable Hem Not Illustrated LB LW PROPANE GAS TRAIN ASSEMBLY MODEL 1000 Item Description Part No Item Description Part No Valve Main Gas LP 300 Series Elbow 90 Street 1 1 4 Regulator LP 301 Series Elbow 90 1 1
3. PSD 3 153 __ 2 SO D I A WATER Goan COMMERCIAL POWER BURNER BOILER REPLACEMENT PARTS LIST WIRING HARNESS amp PROBES COPPER BOILERS FORHYDRONIC See page 12 PROPANE GASTRAINASSEMBLY HEATING amp HOT WATER SUPPLY See pages 8 10 LEGEND MODELS LB LW 500 750 amp 1000 SERIES 300 301 NATURAL GAS TRAIN BLOWER ASSEMBLY See pages 5 7 JACKET FRAME ASSEMBLY See page 4 WATERWAYS amp COMBUSTION CHAMBER See page 2 CONTROL BOARD See page 11 BY PASS See pages 8 10 EXHAUST amp DRAIN ASSEMBLY Se See page 3 WATERINLET See page 3 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 PRINTED IN U S A 0403 211691 000 LB LW WATERWAYS amp COMBUSTION CHAMBER PARTS LIST Description Model 500 Model 750 Model 1000 Burner and Cone Assembly Combustion Chamber Assembly Connector Hose Coupling Flexible w Gasket Cover Outer Gasket Outer Gasket Burner Gasket Inner Housing Assembly Ignitor Insulation Burner Nut Manifold g Probe Outlet Temp ECO Probe Inlet Tempi ss scsevsesazes ceecsctvuscstetepscaaseradenasatvectagaessetioe eae eee 210571 Screw Machine 8 32 3 8 Long SST Screw Machine 8 32 1 Long SST Sealer Silicone Hi Temp Sensor Flame Spacer Rin
4. f 25 Port Observation Upper Elbow Union 1 26 Screen Air Inlet 192041 Elbow Street 1 27 Screw Cap 1 4 190960 2 pode oo Port 28 Srew Flathead 8 32 x 1 2 191542 gt i 29 Screw Flathead 8 32 x 3 4 191542 1 NEE Se 30 Switch Low Pressure Gasket Port 1 8 Thick 31 Tee 1 8 Manifold Assembly 32 Tee Union 191633 Nipple Close 1 8 33 Tubing Pressure 191562 Nipple Close Stainless 34 U Bolt Assembly 191938 1 Nipple Tapped 35 Valve Main Gas 191956 Nipple 1 x 9 1 2 36 Washer Lock 1 4 Nipple 1 x 2 37 Shutter Blower 211694 Nipple Pipe 1 x2 1 2 38 Flange Shutter 211695 Nipple Pipe 1 x14 1 2 39 Manual Firing Valve OANDARWNM Item Not Illustrated DETAIL BACK VIEW Note Manual firing valve item 43 used on US models made on or after 6 1 02 LEGEND ORIFICE TABLE Model Natural Gas Size In Elevation Ft 191884 2 0 374 LB LW NATURAL GAS TRAIN BLOWER ASSEMBLY MODEL 750 Item Description Model 750 Item Description Model 750 211614 21 Nut Hex 1 4 170272 Blower Adapter Assembly 191645 22 Orifice Air 192737 1 Blower Manifold Assembly 23 Orifice Union See Orifice Table Below Bracket Blower 24 Plug 1 8 Pipe Clamp Hose 25 Port Observation Lower 26 Port Observation Upper Face Bushing 1 x1 1 4 27 Screen Air Inlet Flange
5. 4 Valve Firing Nipple 1 1 4 w Tapping 86505 32 Nipple 1 1 4 86505 6 Nipple 1 1 4 Tee 1 8 NPT Branch Connector Angle 1 8 Bleeder Tube Bleeder Tube Nipple Close Stainless Orifice Union LB LW 1000 ORIFICE TABLE PropaneGas Stein Elevation Ft 192739 0 333 0 2000 192739 1 0 329 2001 3000 192739 2 0 325 3001 4000 On LB models the circulating pump must be between the boiler inlet and the bypass see figure below Description LW models have pump mounted inside the jacket Ball Valve Tank Pump Kit LW Models Hex Reducing Bushing LB Model Flush Bushing LB Model Relief Valve LW Model Relief Valve LB Model Strap Cable not shown Tee Condensate Tee For use w relief valve Tee 2 x2 x2 Tee 2 x2 x3 4 Valve Drain Valve Manual Shutoff Vent Patch Assembly Nipple For use w relief valve LW Model LB Model Clamp Hose hem Not Illustrated LB LW CONTROL BOARD WHC 1502 Part Number 210128 CONTROL BOARD WHC1502 POLARITY LED GREEN FUSE 3 AMP 210205 JUMPER 210491 BLOWN FUSE LED RED LB LW WIRING CHART ote He 51 EL Ue 3 PART NUMBER White 14 41974 Black 99650 Green 41972 White 86580 Black 86578 Green 69058 White 170595 Black 170596 Green 170606 Blue 191719 170603 Yellow 170604 Brown 170890 White Red 191700 White Yellow 191702 White Black 191699 Black White 191694 Yellow Blue 191708 Red Green 191717
6. 4 191685 4 191685 5 Washer Plain 76820 18 76820 18 76820 18 Vent Support Bracket 1000 Model Only 192194 Vent Restricting Ring 500 Model Only Vent Restricting Ring Series 301 LP LB LW JACKET FRAME ASSEMBLY Description Model 500 Bolt Machine 5 16 18 Control Panel Assembly Display Board Frame Assembly Gasket Dispaly Grommet Junction Box Assembly Junction Box Cover Label Control Panel Locknut Star Locknut 6 32 Nipple Chase Nut Lock Hex 5 16 18 1000 Model Only Panel Assembly Left Side Panel Assembly Right Side Panel Lower Front Panel Rear Natural Panel Rear Propane Panel Top Cover Plate Rear Cover 1000 Model Only Screw Hex Head 5 16 Screw Hex Head 6 32 Switch Blower Prover Switch Blocked Flue Switch Rocker Support Bracket Propane Only Transformer 75VA Transformer 100VA U Bolt Assembly Water way Washer Flat Washer Lock Switch Relay Blower Speed Control Control Bracket Assembly Model 750 Model 1000 210214 210125 210206 191666 210017 210449 191938 211546 LB LW NATURAL GAS TRAIN BLOWER ASSEMBLY MODEL 500 Item Description Model 500 Item Description Model 500 Ge 211613 20 Nut Hex 1 4 170272 Blower Adapter Assembly 21 Orifice Air 192737 Blower Manifold Assembly 22 Orifice Union See Orifice Table Below Bracket Blower 23 Plug 1 8 Pipe Clamp Hose 24 Port Observation Lower
7. Observation Port 28 Screw Cap 1 4 Gasket Blower 29 Srew Flathead 8 32 x 1 2 Gasket Burner van Gasket Manifold an Gasket Port 1 8 Thick 33 Gasket Port 1 16 Thick 34 SH Manifold Assembly 191610 35 Tubing Pressure Ae EE ue 191147 1 ege Tubing Top Cover Assembly ipple Close Stainless 191772 37 U Bolt Assembly Nipple xe Vie with Tap 38 Valve Main Gas Nipple 1 x 9 1 2 Nipple 1 S 2 39 Washer Lock 1 4 Nipple 1 x15 1 2 86397 13 40 Valve Solenoid Gas 7 Nipple 1 1 4 x 2 86505 29 41 Shutter Blower Nipple 1 xClose 42 Flange Shutter Nipple 1 x4 Manual Firing Valve tem Not Illustrated LEGEND ORIFICE TABLE for boilers built on or after 6 01 02 Model _ Natural Gas Size In Elevation Ft i LEGEND ORIFICETABLE wei Natural Gas Size In Elevation Ft Note Manual firing valve item 43 used on US models made on or after 6 1 02 LB LW NATURAL GAS TRAIN BLOWER ASSEMBLY MODEL 1000 Item Description Model 1000 Item Description Model 1000 192195 24 Orifice Air Series 300 Nat Gas 192737 3 Blower Adapter Assembly 24 Orifice Air Series 30211 L P Gas 192737 2 Blower Manifold Assembly 25 Orifice Union See Orifice Table Below Bracket Blower 26 Plug 1 8 Pipe Clamp Hose 27 Port Observation Lower 191572 Elbow 1 1 4 28 Port Observation Upper 191572 1 Elbow Union 1 1 4 29
8. Screen Air Inlet 192220 1 Flanged Observation Port 30 Screw Cap 1 4 190960 2 Gasket Blower Air Inlet 31 Srew Flathead 8 32 x 1 2 191542 SE SE S 32 Screw Flathead 8 32 x 3 4 191542 1 Gasket Port 1 8 Thick 33 Switch Low Pressure 191149 1 G 34 Shutter Blower 192593 Nut Hex 1 4 Serrated Manifold Assembly Air Gas 35 Shutter Flange 192592 Nipple Close 1 8 36 Tee 1 8 Nipple Close Stainless 37 Tee Pressure Nipple Tapp 38 Tubing Pressure 191562 Nipple 1 1 4 x 38 1 2 40 U Bolt Assembly Gas Train 191938 3 Nipple 1 1 4 x 28 3 4 41 Valve Main Gas 78481 3 Nipple 1 1 4 x 2 42 Valve Firing Nipple 1 1 4 x 3 43 Valve Solenoid Gas 192189 Nipple 1 1 4 x 4 44 Washer Plain 76820 18 Nut Hex 1 4 42 Manual Shut off Valve 211695 Item Not Illustrated DETAIL BACK VIEW LEGEND ORIFICE TABLE Size Elevation inches Feet 192222 0 555_ 0 2000 192222 2 0 533 3001 4000 LB LW PROPANE GAS TRAIN ASSEMBLY MODEL 500 Item Description Model 500 Valve Main Gas Regulator LP Valve Manual Shut Off Pipe Plug Switch Low Gas Pressure On LB models the circulating pump must be between the boiler inlet and the bypass see figure below LW models have pump mounted inside the jacket Item Description Model 500 Elbow 90 Street 1 Elbow 90 1 Nipple 1
9. g Switch Safety Flow Tee Assembly Tube Assembly Primary LW Models Tube Assembly Primary LB Models Tube Assembly Outlet Tube Assembly Secondary Washer Flat 8 SST Restrictor Air Top Cover Item Not Illustrated Note 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 p n 211742 for LB LW 500 models p n 211742 1 for LB LW 750 models and p n 211742 2 for LB LW 1000 models LW Models LB Models LB LW EXHAUST DRAIN amp WATER INLET ASSEMBLY PARTS LIST Description Model 500 Model 750 Model 1000 Clamp Hose Large 191794 1 191794 1 Clamp Hose Small 191794 3 191817 1 Drain Flange Drain Flange Assembly 191625 191625 191664 191664 Gasket Drain Gasket Vent 191683 20373 15 191556 1 191556 1 Plate Drain Seal 191626 191626 191626 Pump Assembly Circulator LW Models 211611 211612 211538 Tube Assembly Inlet LW Models 210897 1 210897 2 Tube Assembly Primary LB Models Tube Assembly Primary LW Models Tubing Condensate 191746 24 Tubing Pressure 191562 26 191562 26 191562 26 U Bolt Assembly 191938 191938 191938 Valve Drain Vent Assembly Vent Flange 191685
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