Features And Components - A.O. Smith 300 Series Instruction Manual

1: Central Control Board (CCB) Enclosure
2: Blocked Intake Switch
3: Blocked Outlet Switch
4: Blower Assembly
5: Burner Assembly
6: Flame Sensor
7: Igniter Assembly
8: Junction Box
9: Gas Control Valve Assembly
10: UIM (user interface module)
11: Top Plastic Enclosure

FEATURES AND COMPONENTS

FEATURES AND COMPONENTS
Figure 3. 50 Gallon Unit
12: Display Enclosure
** 13: Exhaust Elbow Assembly
** 14: Condensate Drain Outlet
15: Enable / Disable Switch
16: Hot Water Outlet
17: Gas Supply
18: Main Manual Gas Shutoff Valve
19: Union
20: Inlet Water Shutoff Valve
21: Cold Water Inlet
22: Inlet Dip Tube
10
* CAUTION HARNESS HAS 120 VAC. IN OPERATION.
** See Venting Installation (page 23) and Condensate Piping (page
21) for more information.
9
4
7
6
5
Vacuum Relief
Valve
23: T/P Relief Valve
24: Rating Plate
25: Labels
26: Drain Valve
** 27: Vent Terminal
28: Drain Pan
29: Anode Rod
30: Insulation
31: Temperature Probe
32: Access Door
33: Spark Module
**13
**14
Access
Panel
Caution: This access panel
covers a 2" NPT plug that
was required during the man-
ufacturing of this water
heater. This 2" NPT flange is
not a cleanout fitting, remov-
ing the 2" NPT plug and using
this fitting as a cleanout
could void your warranty.