A.O. Smith LB-1000 Application guide

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PSD-3-148
COMMERCIAL POWER BURNER BOILER
REPLACEMENT PARTS LIST
COPPER BOILERS FOR HYDRONIC
HEATING & HOT WATER SUPPLY
LEGEND MODELS LW/LB: 1000
SERIES 980, 981
A.O. SMITH WATER PRODUCTS CO., INC.
5621 W. 115TH STREET • ALSIP, ILLINOIS 60803
Phone: [phone] • Fax: [phone]
Website: www.hotwater.com/parts
PRINTED IN U.S.A. 1001 210654-000
NATURALGAS
TRAIN/BLOWER
ASSEMBLY
See page 5
PROPANE GAS TRAIN ASSEMBLY
See page 6
WATERWAYS &
COMBUSTION
CHAMBER
See page 2
EXHAUST & DRAIN
ASSEMBLY
See page 3
WATERINLET
See page 3
BY-PASS
See page 6
WIRING/HARNESS & PROBES
See page 8
JACKET/FRAMEASSEMBLY
See page 4
CONTROLBOARD
See page 7

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LB/LLB/L
LB/LLB/L
LB/L
WW
WW
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Item Description Part Number
1..... Bracket .................................................. 191602
2..... Burner and Cone Assembly ................... 191850-2
3..... Combustion Chamber Asembly ............. 192129-1
4..... Connector, Hose ..................................... 191765
5..... Coupling, Flexible w/Gasket ..................191780-1
6..... Cover Outer ............................................ 210404
7..... Gasket, Outer........................................ 191563-1
8..... Gasket, Burner ...................................... 191564-1
9..... Gasket, Inner .......................................... 191563
10 .... Housing Assembly ................................ 191627-4
11..... Ignitor ..................................................... 192334
12 .... Insulation, Burner ................................... 191618
13 .... Nut, Manifold .........................................191555-1
14 .... O-Ring ................................................... 191556-2
15 .... Probe, Outlet Temp./ECO ....................... 210572
LB/LW 1000 WATERWAYS & COMBUSTION CHAMBER PARTS LIST
16 .... Probe, Inlet Temp ................................... 210571
17 .... Screw, Machine #8-32/ 3/8" Long, SST .. 210444
18 .... Screw, Machine #8-32/ 1" Long, SST ..... 191770
19 .... Sealer, Silicone (not shown) .................. 191482-1
20 .... Sensor, Flame ........................................ 210421
21 .... Spacer Ring .......................................... 191554-1
22 .... Switch, Safety Flow ................................ 210176
23 .... Tee Assembly......................................... 192387
24 .... Tube Assembly, Primary (LW Models) .... 192388
24 .... Tube Assembly, Primary (LB Models) ..... 192225
25 .... Tube Assembly, Outlet ........................... 210426
26 .... Tube Assembly, Secondary .................... 192386
27 .... Washer, Flat #8 SST .............................. 191768
28 .... Restrictor-Air, Top Cover ........................ 191926-1
Item Description Part Number

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LB/LLB/L
LB/LLB/L
LB/L
WW
WW
W
1 .... Clamp, Hose (Large) .............................. 191794-1
2 .... Clamp, Hose (Small) .............................. 191794-3
3 .... Connector, Female Bulkhead................... 191744
4 .... Connector, Port ....................................... 191745
5 .... Drain, Flange ........................................... 191620
6 .... Drain, Flange Assembly .......................... 191625
7 .... Elbow ...................................................... 191664
8 .... Gasket, Blocked Flue.............................. 191767
9 .... Gasket, Drain .......................................... 191622
10 .... Gasket, Vent .......................................... 191683-1
11 .... Nipple ..................................................... 20373-18
12 .... Nut, Hex 1/4" .......................................... 191769
13 .... O-Ring .................................................... 191556-1
14 .... Plate, Drain Seal ..................................... 191626
15 .... Pump Ass'y, Circulator (LW Models) ....... 192203
LB/LW 1000 EXHAUST, DRAIN & WATER INLET ASSEMBLY PARTS LIST
Item Description Part Number
Item Description Part Number
16 .... Tube Assembly, Inlet (LW Models) .......... 192308
17 .... Tube Assembly, Primary (LB Models) ..... 192225
18 .... Tube Assembly, Primary (LW Models) ..... 192388
19 .... Tubing, Condensate ................................ 191746
20 .... Tubing, Pressure ..................................... 191562
21 .... U-Bolt Assembly ..................................... 191938
22 .... Valve Drain ............................................... 26273
23 .... Vent Assembly ........................................ 210494
24 .... Vent Flange ............................................ 191685-5
25 .... Vent Flange Assembly ........................... 191686-1
26 .... Washer, Lock 1/4" Stainless ................... 191771
27 .... Washer, Flat ........................................... 191766
28 .... Vent Support, Bracket ............................. 192194
29 .... Vent, Restricting Ring (Series 981, LP) .. 191923-1

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LB/LLB/L
LB/L
WW
WW
W
LB/LW 1000 JACKET/FRAME ASSEMBLY
Item Description Part No.
1 .... Bolt Machine 5/16” - 18" ...................... 191358-2
2 .... Control Panel Assembly ........................ 210601
3 .... Display Board ....................................... 210219
4 .... Frame Assembly .................................. 210501
5 .... Gasket, Display .................................... 210130
6 .... Grommet ............................................... 97951
7 .... Handle .................................................. 191802
8 .... Junction Box Assembly ........................190438-1
9 .... Junction Box Cover .................................. 2233
10 .... Label, Control Panel .............................. 210561-1
11 .... Locknut, Star ........................................... 1953
12 .... Locknut #6 -32 ....................................... 210207
13 .... Nipple, Chase ......................................... 41994
14 .... Nut, Lock Hex 5/16” - 18" ........................ 97896
15 .... Panel Assembly, Left Side .................... 191796-3
16 .... Panel Assembly, Right Side ..................191796-2
17 .... Panel, Lower Front ............................... 191805-1
18 .... Panel, Rear (Natural) .............................. 192191
18 .... Panel, Rear (Propane) ............................ 210020
19 .... Panel, Top Cover .................................. 191609-1
20 .... Plate, Rear Cover ................................... 210214
21 .... Screw, Hex Head 5/16” .......................... 210125
22 .... Screw, Hex Head #6 -32 ........................ 210206
23 .... Switch, Blower Prover ............................ 191666
24 .... Switch, Blocked Flue ............................. 191667
25 .... Switch , Rocker .................................... 191665-1
26 .... Support Bracket (Propane Only) ............. 210017
27 .... Transformer (100VA) .............................. 210449
28 .... U - Bolt Assembly (Waterway) ............... 191938
29 .... Washer, Flat .......................................... 191359
30 .... Washer, Lock ........................................ 191480
31 .... Switch, Relay ........................................ 211546
Item Description Part No.

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LB/LLB/L
LB/LLB/L
LB/L
WW
WW
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LB/LW 1000 NATURAL GAS TRAIN/BLOWER ASSEMBLY
Item Description Part No.
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 .... Flange, Observation Port ....................... 191573
9 .... Gasket, Blower Air Inlet ........................ 192213
10 .... Gasket, Burner ..................................... 191564
11 .... Gasket, Manifold ................................... 191565
12 .... Gasket, Port (1/8" Thick) ...................... 191576
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” ........................................ 170272
24 .... Orifice, Air (Series 980 - Nat. Gas) ....... 192737-3
.... Orifice, Air (Series 981 - 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 .... Screw, Flathead #8-32 x 1/2" ................ 191542
32 .... Screw, Flathead #8-32 x 3/4" ............... 191542-1
33 .... Switch, Low Gas 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, Lock 1/4" .................................. 1006
Item Description Part No.
DETAIL BACK VIEW
LEGENDORIFICE TABLE
Natural Propane Size Elevation
Gas Gas (inches) (Feet)
192222 --- 0.555 0-2000
192222-1 --- 0.537 2001-3000
192222-2 --- 0.533 3001-4000
--- 192739 0.333 0-2000
--- 192739-1 0.329 2001-3000
--- 192739-2 0.325 3001-4000

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LB/LLB/L
LB/LLB/L
LB/LWW
WW
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LB/LLB/L
LB/LLB/L
LB/L
WW
WW
W
Please update these numbers
LB/LW 1000 PROPANE GAS TRAIN ASSEMBLY
Item Description Part No.
1 .... Valve, Main Gas, LP 981 Series............. 77780
2 .... Regulator, LP 981 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
Item Description Part No.
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
1 ...... Ball Valve ............................................................... 191935
2 ...... Tank/Pump Kit (LW Models Only - Not Shown) ...... 210625
3 ...... Hex Reducing Bushing (LB Only) .......................... 91940-8
4 ...... Flush Bushing (LB Only) .......................................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
LB/LW 1000 BY-PASS PARTS LIST
Item Description Part No.
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.

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LB/LW 1000 WIRING CHART
COLOR GAUGE PART NUMBER ***
White 14 41974
Black 14 99650
Green 14 41972
White 16 86580
Black 16 86578
Green 16 69058
White 18 170595
Black 18 170596
Green 18 170606
Blue 18 191719
Red 18 170603
Yellow 18 170604
Brown 18 170890
White/Red 18 191700
White/Yellow 18 191702
White/Black 18 191699
Black/White 18 191694
Yellow/Blue 18 191708
Red/Green 18 191717
*** Use dash number to indicate length of wire.
Example: 20 inch long red wire would be expressed as 170603-20.
LB/LW 1000 CONTROL BOARD WHC 1502
Part Number 210128

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Outlet Temperature
Control/ ECO Assembly
210572
Tank Probe (LW Models)
210211-1
Inlet Temperature
Control Assembly
210571
LB/LW 1000 TERMINALS
Tank Probe
Harness Assembly
210604
Pressure Flow Switch
Harness Assembly
210576
Power
Harness Assembly
210579-1
Gas Valve
Harness Assembly
210574 (-1 Propane)
Transformer
Harness Assembly
210578
Blower
Harness Assembly
210609
Ignition
Harness Assembly
210575
78468 99593-6 78469 191673 42573 210091 210152 99599-2
LB/LW 1000 WIRING AND HARNESS ASSEMBLY