A.O. Smith LB/LW 500 Water Heater User Manual


 
6
LB/LW NATURAL GAS TRAIN/BLOWER ASSEMBLY- 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
Item Description Model 750
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
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