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
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
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) ........................................... 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
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 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
4
LB/LW NATURAL GAS TRAIN/BLOWER ASSEMBLY- MODEL 500
Item Description
Model 500
Item Description
Model 500
1 ....Blower ............................................................ 211613
2 ....Blower Adapter Assembly ............................. 191645
3 ....Blower Manifold Assembly ............................ 191832
*4 ....Bracket, Blower .............................................. 191773
*5 ....Clamp, Hose ................................................. 191794
6 ....Elbow, 1" .............................................................1630
7 ....Elbow, Union 1" .............................................. 2482-1
8 ....Elbow, Street 1".............................................. 190763
9 ....Flange, Observation Port............................... 191573
10 ....Gasket, Blower .............................................. 191623
11 ....Gasket, Burner ............................................... 191564
12 ....Gasket, Manifold ............................................ 191565
13 ....Gasket, Port (1/8" Thick) ................................ 191576
14 ....Manifold Assembly ........................................ 191610
15 ....Nipple, Close 1/8" ...................................... 191147-1
16 ....Nipple, Close Stainless ................................ 191772
17 ....Nipple, Tapped ........................................... 86397-11
18 ....Nipple, 1" x 9 1/2"............................................. 86397
19 ....Nipple, 1" x 2" ......................................................1177
19A ....Nipple, Pipe 1"x2 1/2" .........................................1179
19B ....Nipple, Pipe 1"x14 1/2" ................................. 86397-6
20 ....Nut, Hex 1/4" ..................................................... 170272
21 ....Orifice, Air .......................................................... 192737
22 ....Orifice, Union (See Orifice Table Below)
23 ....Plug, 1/8" Pipe .................................................... 3348
24 ....Port, Observation Lower ................................... 191572
25 ....Port, Observation Upper ................................. 191572-1
26 ....Screen, Air Inlet................................................. 192041
27 ....Screw, Cap 1/4" .............................................. 190960-2
28 ....Srew, Flathead #8-32 x 1/2" ............................. 191542
29 ....Screw, Flathead #8-32 x 3/4" ......................... 191542-1
30 ....Switch, Low Pressure .................................... 191149-1
31 ....Tee, 1/8" ............................................................. 40119
*32 ....Tee, Union ........................................................ 191633
*33 ....Tubing, Pressure .............................................. 191562
*34 ....U-Bolt Assembly ............................................. 191938-1
35 ....Valve, Main Gas ................................................ 191956
36 ....Washer, Lock 1/4" .............................................. 1006
37 ....Shutter, Blower ................................................. 211694
38 ....Flange, Shutter ................................................. 211695
39 ....Manual Firing Valve .......................................... 3423-4
*Item Not Illustrated.
DETAILBACKVIEW
Note: Manual firing valve (item 43) used on
US models made on or after 6/1/02.
LEGENDORIFICETABLE
Model
Natural Gas Size (In.) Elevation(Ft.)
LB & LW-500
LB & LW-500
LB & LW-500
191884-0
191884-1
191884-2
0.391
0.384
0.374
0 - 2000
2001 - 3000
3001 - 4000
5
LB/LW NATURAL GAS TRAIN/BLOWER ASSEMBLY- MODEL 750
Item Description
Model 750
Item Description
Model 750
1 ..... Blower ............................................................. 211614
2 ..... Blower Adapter Assembly .............................. 191645
3 ..... Blower Manifold Assembly ............................. 191832
*4 ..... Bracket, Blower ............................................... 191773
*5 ..... Clamp, Hose ................................................... 191794
6 ..... Elbow, 1" ........................................................... 1630
7 ..... Face Bushing 1"x1 1/4" ................................... 99376
*9 ..... Flange, Observation Port ................................ 191573
10 ..... Gasket, Blower................................................ 191623
*11 ..... Gasket, Burner ................................................ 191564
12 ..... Gasket, Manifold ............................................. 191565
*13 ..... Gasket, Port (1/8" Thick) ............................... 191576-1
*14 ..... Gasket, Port (1/16" Thick) ............................... 191576
15 ..... Manifold Assembly ......................................... 191610
16 ..... Nipple, Close 1/8"......................................... 191147-1
17 ..... Nipple, Close Stainless ................................. 191772
18 ..... Nipple, 1x4 1/2" with Tap .............................. 86397-14
19 ..... Nipple, 1" x 9 1/2" ............................................. 86397
20 ..... Nipple, 1" x 2" .................................................... 1177
20A ... Nipple, 1"x15 1/2" ......................................... 86397-13
20B... Nipple, 1 1/4" x 2" .......................................... 86505-29
20C .. Nipple, 1"xClose ............................................... 1342
20D .. Nipple, 1"x4" ................................................... 86397-7
21 ....Nut, Hex 1/4" ..................................................... 170272
22 ....Orifice, Air ........................................................ 192737-1
23 ....Orifice, Union (See Orifice Table Below)
24 ....Plug, 1/8" Pipe .................................................... 3348
*25 ....Port, Observation Lower ................................... 191572
*26 ....Port, Observation Upper ................................. 191572-1
27 ....Screen, Air Inlet................................................. 192041
*28 ....Screw, Cap 1/4" .............................................. 190960-2
*29 ....Srew, Flathead #8-32 x 1/2" ............................. 191542
*30 ....Screw, Flathead #8-32 x 3/4" ......................... 191542-1
31 ....Switch, Low Pressure .................................... 191149-1
33 ....Tee, 1/8" ............................................................. 40119
*34 ....Tee, Union ........................................................ 191633
*35 ....Tubing, Pressure .............................................. 191562
*36 ....Tubing, Top Cover Assembly ........................... 191925
*37 ....U-Bolt Assembly ............................................. 191938-1
38 ....Valve, Main Gas ............................................... 78481-3
*39 ....Washer, Lock 1/4" .............................................. 1006
40 ....Valve, Solenoid Gas ......................................... 192189
41 ....Shutter, Blower ................................................. 211694
42 ....Flange, Shutter ................................................. 211695
43 ....Manual Firing Valve .......................................... 3423-4
*Item Not Illustrated.
DETAILBACKVIEW
LEGENDORIFICETABLE
for boilers built on or after 6/01/02.
Model
Natural Gas Size (In.) Elevation(Ft.)
LB & LW-750 191884-11
LB & LW-750 191884-12
LB & LW-750 191884-13
0.464
0.450
0.443
0 - 2000
2001 - 3000
3001 - 4000
LEGENDORIFICETABLE
Model
Natural Gas Size (In.) Elevation(Ft.)
LB & LW-750
LB & LW-750
LB & LW-750
191884-3
191884-5
191884-7
0.484
0.469
0.461
0 - 2000
2001 - 3000
3001 - 4000
Note: Manual firing valve (item 43) used on
US models made on or after 6/1/02.
6
LB/LW NATURAL GAS TRAIN/BLOWER ASSEMBLY - MODEL 1000
Item Description
Model 1000 Item Description
Model 1000
1 .....Blower ............................................................... 192195
2 .....Blower Adapter Assembly .............................. 192215-1
3 .....Blower Manifold Assembly ............................... 192217
4 .....Bracket, Blower ................................................. 210214
5 .....Clamp, Hose .................................................. 191794-3
6 .....Elbow, 1-1/4" ..................................................... 192216
7 .....Elbow, Union 1-1/4" ......................................... 86506-1
8 .....Flanged Observation Port ................................ 191573
9 .....Gasket, Blower Air Inlet .................................... 192213
10 ....Gasket, Burner .................................................. 191564
11 ....Gasket, Manifold ............................................... 191565
12 ....Gasket, Port (1/8" Thick) ................................... 191576
13 ....Nut, Hex 1/4", Serrated ..................................... 210226
14 ....Manifold Assembly - Air/Gas ............................ 192309
15 ....Nipple, Close 1/8" .......................................... 191147-3
16 ....Nipple, Close Stainless ................................. 191772-1
17 ....Nipple, Tapped ................................................ 86505-3
18 ....Nipple, 1-1/4" x 38-1/2" ................................... 86505-28
19 ....Nipple, 1-1/4" x 28-3/4" ................................... 86505-27
20 ....Nipple, 1-1/4" x 2" .............................................. 86505
21 ....Nipple, 1-1/4" x 3" ............................................ 86505-2
22 ....Nipple, 1-1/4" x 4" ............................................ 86505-6
23 ....Nut, Hex 1/4" ................................................... 191817-1
24 ....Orifice, Air (Series 300 - Nat. Gas)................. 192737-3
24 ....Orifice, Air (Series 30211 - L.P. Gas) ............ 192737-2
25 ....Orifice, Union (See Orifice Table Below)
26 ....Plug, 1/8" Pipe .................................................... 3348
27 ....Port, Observation Lower ................................... 191572
28 ....Port, Observation Upper ................................. 191572-1
29 ....Screen, Air Inlet............................................... 192220-1
30 ....Screw, Cap 1/4" .............................................. 190960-2
31 ....Srew, Flathead #8-32 x 1/2" ............................. 191542
32 ....Screw, Flathead #8-32 x 3/4" ......................... 191542-1
33 ....Switch, Low Pressure .................................... 191149-1
34 ....Shutter, Blower ................................................. 192593
35 ....Shutter Flange .................................................. 192592
36 ....Tee, 1/8" ............................................................. 40119
37 ....Tee, Pressure ................................................... 191633
38 ....Tubing, Pressure .............................................. 191562
40 ....U-Bolt Assembly (Gas Train) ......................... 191938-3
41 ....Valve, Main Gas ............................................... 78481-3
42 ....Valve, Firing....................................................... 3423-3
43 ....Valve, Solenoid Gas ......................................... 192189
44 ....Washer, Plain ................................................. 76820-18
42 ....Manual, Shut-off Valve ...................................... 211695
*Item Not Illustrated.
DETAILBACKVIEW
LEGEND ORIFICE TABLE
Natural
Gas
Size
(inches)
0.555
Elevation
(Feet)
192222
192222-1
192222-2
0-2000
0.537
2001-3000
3001-4000
0.533
7
LB/LW PROPANE GAS TRAIN ASSEMBLY - MODEL 500
Item Description
Model 500
Item Description
Model 500
10 ....Elbow, 90° Street, 1" ............................................... 190763
11 ....Elbow, 90°, 1".......................................................... 1630
12 ....Nipple, 1" ................................................................ 1179
13 ....Nipple, 1" ............................................................ 86397-11
14 ....Nipple, 1/8" ......................................................... 191147-1
15 ....Tee, 1/8" .................................................................40119
16 ....Nipple, Close Stainless .......................................191772
17 ....Orifice, Union .............................. See Orifice Table Below
1 .....Valve, Main Gas .............................................. 191956-1
2 .....Regulator, LP ..................................................... - - - - -
3 .....Valve, Manual Shut-Off ..................................... 3423-4
4 .....Pipe Plug ............................................................ 3348
5 .....Switch, Low Gas Pressure............................. 191149-3
6 .....Nipple, 1" ........................................................... 86397
7 .....Nipple, 1" ......................................................... 85397-6
8 .....Nipple, 1" ............................................................ 1177
9 .....Elbow, Union, 1" ...................................................... 2482-1
LB/LW 500 ORIFICE TABLE
Propane Gas
Size (In.)
Elevation(Ft.)
192741
192741-1
192741-2
0.229
0.226
0.223
0 - 2000
2001 - 3000
3001 - 4000
LB/LW BY-PASS PARTS LIST - MODEL 500
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
Please update these numbers
1 .....Ball Valve .............................................................. 191935
2 .....Hex Reducing Bushing LW Models
.....(for use w/Relief Valve)........................................ 91940-1
3 .....Relief valve:
..... LB Model ............................................................ 210451
..... LW Model .......................................................... 98883-3
4 .....Tee, 2" x 2" x 1" .................................................... 78685-2
5 .....Tee, 2" ...................................................................191584
6 .....Tee, 2" x 2" x 2" .................................................... 78685-4
7 .....Valve, Drain ............................................................ 26273
*8 .....Valve, Manual Shutoff ............................................ - - - - -
*9 .....Orifice, Gas Assembly (See Orifice Table)
*10 .....Tube, Condensate ............................................191746-120
*11 .....Strap, Cable ......................................................... 99592-2
*Item Not Illustrated.
8
LB/LW PROPANE GAS TRAIN ASSEMBLY - MODEL 750
Item
Description
Model 750
Item Description
Model 750
12 .......Nipple, 1-1/4" ............................................... 86505-3
13 .......Nipple, 1-1/4" ..............................................86397-11
14 .......Nipple, 1-1/4" ............................................... 86505-4
15 .......Tee, 1/8" ........................................................192465
16 .......Connector, Angle 1/8".....................................1578
17 .......Bleeder, Tube ...............................................210016
18 .......Bleeder, Tube ...............................................192461
19 .......Bushing, 1" x 1-1/4" .......................................99376
20 .......Nipple, Close Stainless ...............................191772
21 .......Orifice, Union .............................. See Orifice Table Below
1 .......Valve, Main Gas .............................................77780
2 .......Regulator, LP ................................................192460
3 .......Valve, Manual Shut-Off ................................. 3423-3
4 .......Pipe Plug ........................................................3348
5 .......Switch, Low Gas Pressure.........................191149-3
6 .......Nipple, 1-1/4" ............................................... 86505-8
7 .......Nipple, 1-1/4 ................................................ 86505-2
8 .......Nipple, 1-1/4" .............................................. 86505-10
9 .......Elbow, Union ,1-1/4" ......................................... 86506
10 .......Elbow, 90° Street , 1-1/4" .................................. 94516
11 .......Elbow, 90°, 1-1/4" .........................................192216
LB/LW 750 ORIFICE TABLE
Propane Gas
192741-3
192741-5
192741-7
Size (In.)
0.286
Elevation(Ft.)
0 - 2000
0.282
2001 - 3000
3001 - 4000
0.278
LB/LW BY-PASS PARTS LIST - MODEL 750
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.
Please update these numbers
Item Description
Model 750
1 .....Ball Valve ..............................................................191935
2 .....Hex Reducing Bushing LW Models
.....(for use w/Relief Valve)........................................ 91940-1
3 .....Relief valve:
..... LB Model .......................................................... 210451-1
..... LW Model .......................................................... 98883-3
4 .....Tee, 2" x 2" x 1" .................................................... 78685-2
5 .....Tee, 2" ...................................................................191584
6 .....Tee, 2" x 2" x 2" .................................................... 78685-4
7 .....Valve, Drain ............................................................ 26273
*8 .....Valve, Manual Shutoff ........................................... 3423-3
*9 .....Orifice, Gas Assembly (See Orifice Table)
*10 .....Tube, Condensate ............................................ 191746-120
*11 .....Strap, Cable ......................................................... 99592-2
*Item Not Illustrated.
9
LB/LW PROPANE GAS TRAIN ASSEMBLY - MODEL 1000
Part No.
Item Description
Item Description
Part No.
1 ...... Valve, Main Gas, LP 300 Series .................. 77780
2 ...... Regulator, LP 301 Series ........................... 192460
3 ...... Valve, Firing ................................................. 3423-3
4 ...... Pipe Plug....................................................... 3348
5 ...... Switch, Low Gas Pressure ....................... 191149-3
6 ...... Nipple, 1-1/4” ............................................ 86505-13
7 ...... Nipple, 1-1/4” ............................................. 86505-2
8 ...... Nipple, 1-1/4” ........................................... 86505-17
9 ...... Elbow, Union 1-1/4” ..................................... 86506
10 ......Elbow, 90 Street 1-1/4”................................. 94516
11 ......Elbow, 90 1-1/4” ......................................... 192216
12 ......Nipple, 1-1/4” w/Tapping.......................... 86505-32
13 ......Nipple, 1-1/4” ............................................. 86505-6
14 ......Nipple, 1-1/4” ............................................ 86505-4
15 ......Tee, 1/8” NPT Branch.................................. 192465
16 ......Connector, Angle 1/8” ................................... 1578
17 ......Bleeder, Tube.............................................. 210016
18 ......Bleeder, Tube.............................................. 192461
19 ......Nipple, Close Stainless ........................... 191772-1
20 ......Orifice, Union ....................... See Orifice Table Below
LB/LW 1000 ORIFICE TABLE
Propane Gas
Size (In.)
Elevation(Ft.)
192739
192739-1
192739-2
0.333
0.329
0.325
0 - 2000
2001 - 3000
3001 - 4000
LB/LW BY-PASS PARTS LIST - MODEL 1000
Description Part No.
On LB models the circulating pump must be between
the boiler inlet and the bypass (see figure below).
Item
LW models have pump mounted inside the jacket.
1 ........ Ball Valve ........................................................................ 191935
*2 ........ Tank/Pump Kit (LW Models) .......................................... 210625
3 ........ Hex Reducing Bushing (LB Model) .............................. 91940-8
4 ........ Flush Bushing (LB Model) ........................................... 192163-2
5 ........ Relief Valve (LW Model) ................................................ 98883-3
........ Relief Valve (LB Model) ................................................ 210451-2
6 ........ Strap, Cable (not shown).............................................. 99592-2
7 ........ Tee, Condensate ......................................................... 192040-1
8 ........ Tee (For use w/relief valve):
............... LW Model ............................................................... 78685-4
............... LB Model ................................................................. 191584
9 ........ Tee 2"x2"x2" .................................................................... 191584
10 ........ Tee 2"x2"x3/4" ................................................................ 78685-4
11 ........ Valve, Drain ..................................................................... 26273
12 ........ Valve, Manual Shutoff ..................................................... 3423-3
13 ........ Vent Patch Assembly ..................................................... 192161
14 ........ Nipple (For use w/relief valve)
............... LW Model .............................................................. 20373-12
............... LB Model ................................................................ 92706-4
15 ........ Clamp, Hose................................................................ 191794-1
*Item Not Illustrated.
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LB/LW CONTROL BOARD WHC 1502
Part Number 210128
LB/LW WIRING CHART
COLOR
White
GAUGE
14
PART NUMBER ***
41974
Black
14
99650
Green
14
41972
White
16
86580
Black
16
86578
Green
16
69058
White
Black
Green
Blue
Red
Yellow
Brown
18
18
18
18
18
18
18
18
18
18
18
18
170595
170596
170606
191719
170603
170604
170890
191700
191702
191699
191694
191708
191717
White/Red
White/Yellow
White/Black
Black/White
Yellow/Blue
Red/Green
18
*** Use dash number to indicate length of wire.
Example: 20 inch long red wire would be expressed as 170603-20.
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LB/LW WIRING AND HARNESS ASSEMBLY
78468
99593-6
78469
191673
42573
210091
210152
99599-2
22-16 Ga. 16-14 Ga.
22-18 Ga.
#10 Stud
22-18 Ga.
Harness Assembly
210575
Tank Probe
Harness Assembly
210604
Pressure Flow Switch
Harness Assembly
10576
Power Harness Assembly
210579-1
(-0 0n -500 Models Only)
Transformer
Harness Assembly
210578 (Model 1000)
211330 (Models 500 & 750)
Gas Valve Harness Assembly
210574-1 (Propane)
210574-2 (Nat. & Prop. Model 500)
Blower
Harness Assembly
210609 (Model 1000)
Outlet Temperature
Control/ ECO Assembly
210572
Tank Probe (LW Models)
211541-1
A.O. SMITH WATER PRODUCTS CO., INC.
5621 W. 115TH STREET • ALSIP, ILLINOIS 60803
Phone: 1-800-433-2545 • Fax: 1-800-433-2515
PSD, Alsip, IL
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