A.O. Smith LB-LW 700, LB-LW 1000 User Manual

WIRING/HARNESS & PROBES

See page 12

PROPANE GAS TRAIN ASSEMBLY

See pages 8-10

JACKET/FRAME ASSEMBLY

See page 4

COMMERCIAL POWER BURNER BOILER

REPLACEMENT PARTS LIST

COPPER BOILERS FOR HYDRONIC

HEATING & HOT WATER SUPPLY

LEGEND MODELS LB/LW: 500, 750 & 1000

SERIES: 400 - 401

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 Heater Parts Fulfillment

125 Southeast Parkway, Franklin, TN 37068

1-800-433-2545 • www.hotwater.com

PRINTED IN U.S.A. 1006 PART NO. 212856-000

1

LB/L W W ATERWA YS & COMBUSTION CHAMBER PARTS LIST

Item Description Model 500 Model 750 Model 1000

1 ................ Bracket ........................................................................................ 191602........................ 191602 .................... 191602

2 ................ Burner, Assembly........................................................................ 211615...................... 211615-1 .................211615-2

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 ...................................................................... 212097 ...................... 212097-1 .................212097-2

11 ................ Ignitor........................................................................................... 192334........................ 192334 .................... 192334

12 ................ Insulation, Burner........................................................................ 191618 ........................ 191618 .................... 191618

13 ................ Nut, Manifold ...............................................................................

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

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.

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

210901........................210901.................... 192225

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 212108 for LB/LW 500 models, p/n 212108-1 for
LB/LW 750 models and p/n 212108-2 for LB/LW 1000 models.

LW Models

LB Models

2

LB/L W EXHAUST, DRAIN & W ATER 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...................................................................................... 191620-1 .............. 191620-1............. 191620-1

6 ................ Drain, Flange Assembly..................................................................... 191625-1 .............. 191625-1 ............. 191625-1

7 ................ Elbow .................................................................................................... 191664 ................. 191664 ................ 191664

9 ................ Gasket, Drain........................................................................................ 211895................. 211895 ................ 211895

10 ............... Gasket, Vent.........................................................................................211736................. 211736 .............. 211736-1

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 ............... Sleeve................................................................................................... 212018................. 212018 ................ 212018

15 ............... Pump Assembly, Circulator (LW Models) ............................................

16 ............... Tube Assembly, Inlet (LW Models).................................................... 212855-0 ..............212855-1............. 212855-2

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 Elbow Assembly ........................................................................... 211902................. 211902 ................ 211903

25 ............... Washer, Plain ..................................................................................... 76820-18 .............. 76820-18............. 76820-18

26 ............... Vent Support, Bracket (1000 Model Only)............................................- - - - - ................... - - - - - ................. 192194

27 ............... Vent, Restricting Ring (500 Model Only) ............................................. 212092.................. - - - - - .................. - - - - -

28 ............... Vent, Restricting Ring (Series 401 LP).................................................- - - - - ................... - - - - - ............... 212092-1

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

3

LB/L W 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 (LB Models)........................................................210219-000 .................210219-000 ............... 210219-000

3 .......... Display Board (LW Models) ...................................................... 210219-001.................210219-001 ............... 210219-001

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)...................................................................191748-5.....................191748-6 ....................192191-1

...........Panel Rear (Propane).................................................................. 191748-5 .....................191748-7 ..................... 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 ......................

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

33.........Control Bracket Assembly ............................................................ 210902 ......................210902-3 ....................192167-2

191665-1 ....................191665-1

4