Reference Parts Listing - A.O. Smith 300 Series Installation And Operating Manual

Replacement parts may be ordered
through your plumber or the local
distributor. When ordering replacement
parts, always have the following
information ready:
1. Model, Serial and Product number
2. Type of gas
3. Item number
4. Parts description
1 Termination Elbow with Vent Screen
2 *Vent Pipe
3 *Vent Pipe Elbow (long radius)
5 Cold-Water Inlet Nipple/Diptube
6 **Combo Heating System Supply Outlet
(Optional)
7 T&P Valve
8 *Discharge Pipe
9 **Combo Heating System Return Inlet
(Optional)
10 Gas Control Valve/Thermostat
(Honeywell)
11 Drain Valve
2
1
2
1
24
23
22
Front View
Figure 58.
100304526_2000545240 _Rev. 01

REFERENCE PARTS LISTING

12 Outer Gas Door
13 Manifold Door Assembly (behind outer
door) (see Figure 3 & Figure 4) (see
also Figure 60 & Figure 61)
14 *Metal Drain Pan
15 *Floor Drain
22 Anode (under cap)
23 Baffle Assembly
24 Hot-Water Outlet Nipple/Anode
26 ****Rubber Coupling (see Figure 5)
(see also Figure 62)
27 Gear Clamp (see Figure 5) (see also
Figure 62)
28 ***Blower with Power Cord (see Figure
5) (see also Figure 62)
29 Air Duct Adapter
30 Air Inlet Snorkel
31 Air Duct
33 Flame Sensor Rod (see Figure 3
& Figure 4) (see also Figure 60 &
Figure 61)
34 Sheet Metal Burner (see Figure 3
& Figure 4) (see also Figure 60 &
Figure 61)
35 Gas Orifice (see Figure 3 &
Figure 4) (see also Figure 60 &
Figure 61)
36 Gas Manifold (see Figure 3 & Figure 4)
3
(see also Figure 60 & Figure 61)
3
5
6
7
8
5
9
10
11
12 13
14
15
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37 Hot-Surface Igniter (see Figure 3
& Figure 4) (see also Figure 60 &
Figure 61)
38 Manifold Door Gasket (see Figure
3 & Figure 4) (see also Figure 60 &
Figure 61)
39 Manifold Door (see Figure 3 & Figure
4) (see also Figure 60 & Figure 61)
40 Two Piece Grommet With Clip (see
Figure 3 & Figure 4) (see also
Figure 60 & Figure 61)
41 Viewport (see Figure 3 & Figure 4)
(see also Figure 60 & Figure 61)
42 Air Tubing (Intake) (see Figure 5) (see
also Figure 62)
43 Blower High Limit Switch (see Figure
5) (see also Figure 62)
44 Intake Air Pressure Switch (NC)
(inside box) (see Figure 5) (see also
Figure 62)
45 Capacitor (see Figure 5) (see also
Figure 62)
46 Air Tubing (Exhaust) (see Figure 5)
(see also Figure 62)
47 Exhaust Air Pressure Switch (NO)
(inside box) (see Figure 5) (see also
Figure 62)
*, **, ***, **** see notes on following
page.
AIR INLET
PIPING
31
30
Rear View
Figure 59.
EXHAUST
OUTLET PIPING
26
27
28
29
53