John Wood Commercial - 300-400K BTU - Manual (Page 9)

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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 41.
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 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 35.
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 3 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
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LEFT SIDE
figure 4 figure 5