Installation Manual

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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.
11. Temperature-Pressure Relief Valve. See Temperature-
Pressure Relief Valve on page 15.
12. Temperature-Pressure Relief Valve discharge pipe - see T&P
Valve Discharge Pipe Requirements: on page 15.
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 connection - 1 1/2” NPT connection.
15. Water heater drain valve.
16. Combustion Blower.
17. Vent connection (exhaust/condensate elbow) - 4 inch
aluminum.
18. Recirculation loop return connection - 3/4" NPT.
19. Spark Ignition Control, When energized, sends the electrical
current to the spark igniter.
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, ground
connections, and other eld installed electrical connections
are made here. See 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 connection - 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
Figure 4 Figure 5
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12
14
15
13
17
3
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18
2
1
4
6
10
LEFT SIDE
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