Side Views
1.Cleanout access panel, covers water heater cleanout opening.
2.CCB enclosure - see Figure 3 on page 8 for description.
3.120 VAC junction box. Incoming power supply and ground connections are made here - see requirements for Power Supply on page 13.
4.Intake air connection - 4 inch PVC.
5.Supply gas line connection. See Supply Gas Line on page 13.
6.Low Gas Pressure switch, see description under Figure 3 on page 8. See Table 4 and the Gas Pressure Requirements on page 13.
7.Water heater 24 VAC Gas Valve.
8.Water outlet pipe - 1 1/2” NPT connection.
9.VFD (variable frequency drive) blower motor drive - - see Figure 3 on page 8 for description.
10.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 42.
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13.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.
14.Water inlet pipe - 1 1/2” NPT connection.
15.Water heater drain valve.
16.Combustion Blower.
17.Vent connection (exhaust elbow) - 4 inch PVC.
18.Condensate trap with 1/2 inch PVC drain connection. See Figure 9 on page 16 and Condensate Drain Installation on page 36.
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Figure 4
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Figure 5
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