A.O. Smith LB-LW- 500, 750, 1000 User Manual

WIRING/HARNESS & PROBES

See page 12

PROPANE GAS TRAIN ASSEMBLY

See pages 8-10

JACKET/FRAME ASSEMBLY

See page 4

PSD-3-153

COMMERCIAL POWER BURNER BOILER

REPLACEMENT PARTS LIST

COPPER BOILERS FOR HYDRONIC

HEATING & HOT WATER SUPPLY

LEGEND MODELS LB/LW: 500, 750 & 1000

SERIES: 300 - 301

NATURAL GAS

TRAIN/BLOWER

ASSEMBLY

See pages 5-7

WATERWAYS &

COMBUSTION

CHAMBER

See page 2

CONTROL BOARD

See page 11

BY-PASS

See pages 8-10

EXHAUST & DRAIN

ASSEMBLY
See page 3

WATER INLET

See page 3

A.O. SMITH WATER PRODUCTS CO., INC.

5621 W. 115TH STREET • ALSIP, ILLINOIS 60803

Phone: [phone] • Fax: [phone]

PRINTED IN U.S.A. 0403 211691-000

Website: www.hotwater.com

1

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........................

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

*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 T ub 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.

191555.................. 191555-1

LW Models

LB Models

2

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) ...........................................

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

211611................. 211612 ................ 211538

.................- - - - -................... - - - - -

3

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 As sembly ............................................................... 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

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

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

............................................................................... 41994 ......................... 41994......................... 41994

...................... 191666

4