AO Smith Water Heater LB LW 1000 User Manual

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  
WIRING/HARNESS & PROBES  
See page 12  
PROPANE GAS TRAIN ASSEMBLY  
See pages 8-10  
NATURAL GAS  
TRAIN/BLOWER  
ASSEMBLY  
See pages 5-7  
JACKET/FRAME ASSEMBLY  
See page 4  
&  
N  
CONTROL BOARD  
See page 11  
BY-PASS  
See pages 8-1
EXHAUST & DRAIN  
ASSEMBLY  
See page 3  
WATER INLET  
See page 3  
A.O. Smith Water Heater Parts Fulillmen
125 Southeast Parkway, Franklin, TN 37068  
PRINTED IN U.S.A. 1006  
PART NO. 212856-000  
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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 ...................................................................................... 191620-1 .............. 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)............................................ 211611 ................. 211612 ................ 211538  
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  
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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 (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 ...................... 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.......................................................................................................... - - - - -......................... - - - - -  
33 ......... Control Bracket Assembly ............................................................ 210902 ...................... 210902-3 ....................192167-2  
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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.  
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.)  
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
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LB/LW NATURAL GAS TRAIN/BLOWER ASSEMBLY- MODEL 750  
Item Description  
Model 750 Item Description  
Model 750  
1 ..... Blower .............................................................191652-1  
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 ........................................................192737-2  
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.  
DETAIL BACK VIEW  
LEGEND ORIFICE TABLE  
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  
LEGEND ORIFICE TABLE  
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
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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.  
DETAIL BACK VIEW  
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
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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
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LB/LW PROPANE GAS TRAIN ASSEMBLY - MODEL 750  
Item  
Model 750  
Description  
Model 750  
Item Description  
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  
Size (In.)  
0.286  
Elevation (Ft.)  
0 - 2000  
192741-5  
0.282  
2001 - 3000  
3001 - 4000  
192741-7  
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.  
Item Description  
Model 750  
1 .....Ball Valve ..............................................................191935  
2 .....Hex Reducing Bushing LW Models  
Please update these numbers  
.....(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
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LB/LW PROPANE GAS TRAIN ASSEMBLY - MODEL 1000  
Item Description  
Part No.  
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  
On LB models the circulating pump must be between  
the boiler inlet and the bypass (see figure below).  
Item  
Description  
Part No.  
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 Heater Parts Fulfillment  
125 Southeast Parkway, Franklin, TN 37068  
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