A.O. Smith 750 & 1000 - Manual (Page 8)

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Item Description Model 500
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 PROPANE GAS TRAIN ASSEMBLY - 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
Item Description Model 500
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
LB/LW BY-PASS PARTS LIST - MODEL 500
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 0.229 0 - 2000
192741-1 0.226 2001 - 3000
192741-2 0.223 3001 - 4000
LB/LW 500 ORIFICE TABLE