A.O. Smith 750 & 1000 - Manual (Page 6)

6
LB/LW NATURAL GAS TRAIN/BLOWER ASSEMBLY- 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
Item Description Model 750
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
DETAIL BACK VIEW
*Item Not Illustrated.
Note: Manual firing valve (item 43) used on
US models made on or after 6/1/02.
LEGEND ORIFICE TABLE
for boilers built on or after 6/01/02.
Model Natural Gas Size (In.) Elevation (Ft.)
LB & LW-750 191884-11 0.464 0 - 2000
LB & LW-750 191884-12 0.450 2001 - 3000
LB & LW-750 191884-13 0.443 3001 - 4000
Model Natural Gas Size (In.) Elevation (Ft.)
LB & LW-750 191884-3 0.484 0 - 2000
LB & LW-750 191884-5 0.469 2001 - 3000
LB & LW-750 191884-7 0.461 3001 - 4000
LEGEND ORIFICE TABLE