Side Views - A.O. Smith BTH-120 Instruction Manual

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LEFT SIDE
120,000 & 150,000 Btu/hr MODELS

side Views

1. Cleanout access panel, covers water heater cleanout
opening.
2. CCB enclosure - see beginning on page 8 for description.
3. Intake air connection - 3 inch PVC.
4. Water heater 24 Volt Gas Valve.
5. Combustion Blower.
6. Water outlet pipe - 1 1/2" NPT connection.
7. UIm (user interface module). The UIm includes the display
circuit board, the control system's LCD display and
operational buttons. Used to adjust various user settings and
view operational information. See Control System Operation
on page 44.
8. Temperature-Pressure relief Valve. See Temperature-
Pressure relief Valve on page 16.
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199,000 & 250,000 Btu/hr MODELS
figure 5
9. Temperature-Pressure relief Valve discharge pipe - see T&P
Valve Discharge Pipe requirements: on page 16.
10. Lower Temperature Probe, 1 of 2 temperature probes. The
water heater's control system monitors this probe to detect
water temperature in the lower portion of the storage tank.
11. Water inlet pipe - 1 1/2" NPT connection.
12. Water heater drain valve.
13. Supply gas line connection. See Gas Supply Systems on
page 14.
14. Low Gas Pressure switch, see description under beginning
on page 8. See Gas Pressure requirements and Table
3 on page 12.
15. Vent connection (exhaust elbow) - 3 inch PVC.
16. Condensate trap with 1/2 inch PVC drain connection. See Figure
9 on page 17 and Condensate Drain Installation on page 38.
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RIGHT SIDE
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