AO Smith Boiler 750 1000 User Guide

PSD-3-153  
COMMERCIAL POWER BURNER BOILER  
REPLACEMENT PARTS LIST  
COPPERBOILERSFORHYDRONIC  
HEATING & HOT WATER SUPPLY  
LEGEND MODELS LB/LW: 500, 750 & 1000  
SERIES: 300 - 301  
WIRING/HARNESS&PROBES  
See page 12  
PROPANEGASTRAINASSEMBLY  
See pages 8-10  
NATURALGAS  
TRAIN/BLOWER  
ASSEMBLY  
See pages 5-7  
JACKET/FRAMEASSEMBLY  
See page 4  
WATERWAYS&  
COMBUSTION  
CHAMBER  
See page 2  
CONTROLBOARD  
See page 11  
BY-PASS  
See pages 8-1
EXHAUST &DRAIN  
ASSEMBLY  
See page 3  
WATERINLET  
See page 3  
A.O. SMITH WATER PRODUCT
5621 W. 115TH STREET • ALSIP, ILLI
Phone: 1-800-433-2545 • Fax: 1-800
PRINTED IN U.S.A. 0403  
211691-000  
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LB/LW WATERWAYS & COMBUSTION CHAMBER PARTS LIST  
Item  
Description  
Model 500  
Model 750  
Model 1000  
1 ................ Bracket ........................................................................................ 191602........................ 191602 .................... 191602  
2 ................ Burner and Cone Assembly ....................................................... 191850...................... 191850-1 ................ 191850-2  
3 ................ Combustion Chamber Assembly ............................................ 191529-2 .................... 191529-3 ................ 192129-1  
4 ................ Connector, Hose......................................................................... 191765........................ 191765 .................... 191765  
5 ................ Coupling, Flexible w/Gasket....................................................... 191780........................ 191780 .................. 191780-1  
6 ................ Cover, Outer ................................................................................ 210408........................ 210408 .................... 210404  
7 ................ Gasket, Outer ............................................................................ 211594-1 .................... 211594-1 ................ 211594-1  
8 ................ Gasket, Burner .......................................................................... 191564-1 .................... 191564-1 ................ 191564-1  
9 ................ Gasket, Inner............................................................................... 211594........................ 211594 .................... 211594  
10 ................ Housing Assembly ..................................................................... 211742...................... 211742-1 ................ 211742-2  
11 ................ Ignitor .......................................................................................... 192334........................ 192334 .................... 192334  
12 ................ Insulation, Burner ....................................................................... 191618........................ 191618 .................... 191618  
13 ................ Nut, Manifold ............................................................................... 191555........................ 191555 .................. 191555-1  
14 ................ O-Ring ......................................................................................... 191556........................ 191556 .................. 191556-2  
15 ................ Probe, Outlet Temp./ECO ........................................................... 210572........................ 210572 .................... 210572  
16 ................ Probe, Inlet Temp. ...................................................................... 210571........................ 210571 .................... 210571  
17 ................ Screw, Machine #8-32, 3/8" Long, SST ..................................... 210444........................ 210444 .................... 210444  
18 ................ Screw, Machine #8-32, 1" Long SST ......................................... 191770........................ 191770 .................... 191770  
*19 ................ Sealer, Silicone Hi-Temp ......................................................... 191482-1 .................... 191482-1 ................ 191482-1  
20 ................ Sensor, Flame ............................................................................ 210421........................ 210421 .................... 210421  
21 ................ Spacer Ring ................................................................................ 191554........................ 191554 .................. 191554-1  
22 ................ Switch, Safety Flow ..................................................................... 211480........................ 211480 .................... 211480  
23 ................ Tee Assembly ............................................................................. 191583........................ 191583 .................... 192387  
24 ................ Tube Assembly, Primary (LW Models) ...................................... 210900........................ 210900 .................... 192388  
24 ................ Tube Assembly, Primary (LB Models) ....................................... 210901........................ 210901 .................... 192225  
25 ................ Tube Assembly, Outlet ............................................................... 210425........................ 210425 .................... 210426  
26 ................ Tube Assembly, Secondary ....................................................... 210912........................ 210912 .................... 192386  
27 ................ Washer, Flat #8 SST................................................................... 191768........................ 191768 .................... 191768  
28 ................ Restrictor-Air, Top Cover .......................................................... 191926-1 .................... 191926-1 ................ 191926-1  
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.  
*Item Not Illustrated.  
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  
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LB/LW EXHAUST, DRAIN & WATER INLET ASSEMBLY PARTS LIST  
Item  
Description  
Model 500  
Model 750  
Model 1000  
1 ................ Clamp, Hose (Large)......................................................................... 191794-1 ..............191794-1 ............ 191794-1  
2 ................ Clamp, Hose (Small)......................................................................... 191794-3 ..............191794-3 ............ 191794-3  
3 ................ Nut, Hex .............................................................................................. 191817-1 ..............191817-1 ............ 191817-1  
5 ................ Drain, Flange ....................................................................................... 191620 ................. 191620 ................ 191620  
6 ................ Drain, Flange Assembly ...................................................................... 191625 ................. 191625 ................ 191625  
7 ................ Elbow .................................................................................................... 191664 ................. 191664 ................ 191664  
9 ................ Gasket, Drain ....................................................................................... 191622 ................. 191622 ................ 191622  
10 ............... Gasket, Vent ......................................................................................... 191683 ................. 191683 .............. 191683-1  
11 ............... Nipple ................................................................................................. 20373-15 ..............20373-15 ............ 20373-18  
12 ............... Nut, Hex 1/4" (Serrated) ....................................................................... 210226 ................. 210226 ................ 210226  
13 ............... O-Ring ................................................................................................ 191556-1 ..............191556-1 ............ 191556-1  
14 ............... Plate, Drain Seal .................................................................................. 191626 ................. 191626 ................ 191626  
15 ............... Pump Assembly, Circulator (LW Models) ........................................... 211611 ................. 211612 ................ 211538  
16 ............... Tube Assembly, Inlet (LW Models) ................................................... 210897-1 ..............210897-2 .............. 192308  
17 ............... Tube Assembly, Primary (LB Models) ................................................ 210901 ................. 210901 ................ 192225  
18 ............... Tube Assembly, Primary (LW Models)................................................ 210900 ................. 210900 ................ 192388  
19 ............... Tubing, Condensate ......................................................................... 191746-24 ........... 191746-24 .......... 191746-24  
20 ............... Tubing, Pressure .............................................................................. 191562-26 ........... 191562-26 .......... 191562-26  
21 ............... U-Bolt Assembly .................................................................................. 191938 ................. 191938 ................ 191938  
22 ............... Valve Drain ............................................................................................ 26273 ................... 26273 .................. 26273  
23 ............... Vent Assembly ..................................................................................... 210499 ................. 210499 ................ 210494  
24 ............... Vent Flange ........................................................................................ 191685-4 ..............191685-4 ............ 191685-5  
25 ............... Washer, Plain..................................................................................... 76820-18 ..............76820-18 ............ 76820-18  
26 ............... Vent Support, Bracket (1000 Model Only) ............................................ - - - - - .................... - - - - -.................. 192194  
27 ............... Vent, Restricting Ring (500 Model Only) ........................................... 191923-2 ................. - - - - -................... - - - - -  
28 ............... Vent, Restricting Ring (Series 301 LP)................................................ - - - - - .................... - - - - -................ 191923-1  
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LB/LW JACKET/FRAME ASSEMBLY  
Item  
Description  
Model 500  
Model 750  
Model 1000  
1 .......... Bolt, Machine 5/16" - 18 ..............................................................191358-1 ................... 191358-1................... 191358-2  
2 .......... Control Panel Assembly .............................................................210601-1 ................... 210601-1..................... 210601  
3 .......... Display Board ............................................................................... 210219 ....................... 210219 ...................... 210219  
4 .......... Frame Assembly .......................................................................... 210495 ..................... 210495-1................... 210501-1  
5 .......... Gasket, Dispaly ............................................................................ 210130 ....................... 210130 ...................... 210130  
6 .......... Grommet ....................................................................................... 97591 ......................... 97591......................... 97591  
7 .......... Handle .......................................................................................... 191802 ....................... 191802 ...................... 191802  
8 .......... Junction Box Assembly ...............................................................190438-1 ................... 190438-1................... 190438-1  
9 .......... Junction Box Cover ........................................................................ 2233 ........................... 2233........................... 2233  
10 ......... Label, Control Panel .................................................................... 210561 ....................... 210561 .................... 210561-1  
11 ......... Locknut, Star ................................................................................... 1953 ........................... 1953........................... 1953  
12 ......... Locknut #6 -32.............................................................................. 210207 ....................... 210207 ...................... 210207  
13 ......... Nipple, Chase ............................................................................... 41994 ......................... 41994......................... 41994  
14 ......... Nut, Lock Hex 5/16" - 18 (1000 Model Only) ................................. - - - - -.......................... - - - - - ......................... 97896  
15 ......... Panel Assembly, Left Side ..........................................................191796-1 ................... 191796-1................... 191796-3  
16 ......... Panel Assembly, Right Side ........................................................ 191796 ....................... 191796 .................... 191796-2  
17 ......... Panel, Lower Front ....................................................................... 191805 ....................... 191805 .................... 191805-1  
18 ......... Panel, Rear (Natural) ................................................................... 191748 ..................... 191748-1..................... 192191  
........... Panel Rear (Propane).................................................................. 191748 ..................... 191748-4..................... 210020  
19 ......... Panel, Top Cover .......................................................................... 191609 ....................... 191609 .................... 191609-1  
20 ......... Plate, Rear Cover (1000 Model Only) ............................................- - - - -.......................... - - - - - ........................ 210214  
21 ......... Screw, Hex Head 5/16" ................................................................ 210125 ....................... 210125 ...................... 210125  
22 ......... Screw, Hex Head #6-32 ............................................................... 210206 ....................... 210206 ...................... 210206  
23 ......... Switch, Blower Prover .................................................................. 191666 ....................... 191666 ...................... 191666  
24 ......... Switch, Blocked Flue .................................................................... 191667 ....................... 191667 ...................... 191667  
25 ......... Switch, Rocker.............................................................................. 191665 ..................... 191665-1................... 191665-1  
26 ......... Support Bracket (Propane Only) .................................................... - - - - -......................... 210019 ...................... 210017  
27 ......... Transformer (75VA)...................................................................... 192528 ....................... 192528 ....................... - - - - -  
........... Transformer (100VA) ..................................................................... - - - - -.......................... - - - - - ........................ 210449  
28 ......... U-Bolt Assembly (Water way) ...................................................... 191938 ....................... 191938 ...................... 191938  
29 ......... Washer, Flat ................................................................................. 191359 ....................... 191359 ...................... 191359  
30 ......... Washer, Lock ............................................................................... 191480 ....................... 191480 ...................... 191480  
31 ......... Switch, Relay ..................................................................................- - - - -......................... 211546 ...................... 211546  
32 ......... Blower Speed Control.................................................................. 191922 ........................ - - - - - ......................... - - - - -  
33 ......... Control Bracket Assembly ........................................................... 210902 ..................... 210902-3................... 192167-2  
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