A.O. Smith 750 & 1000 - Manual (Page 9)

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Item Description Model 750
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 PROPANE GAS TRAIN ASSEMBLY - 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
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
LB/LW BY-PASS PARTS LIST - MODEL 750
Please update these numbers
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 Not Illustrated.
Propane Gas Size (In.) Elevation (Ft.)
192741-3 0.286 0 - 2000
192741-5 0.282 2001 - 3000
192741-7 0.278 3001 - 4000
LB/LW 750 ORIFICE TABLE