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Hersteller: A.O. Smith Dateigröße: 550.11 kb Dateiname: Unterrichtssprache:

4. If all checks are successfully passed, the circulating pump circuit is energized, then the combustion blower is energized for the 20 second pre-purge cycle. 5. When the pre-purge cycle is complete, the ignitor is energized. The pump and blower should continue to run. 6. The ignition control board will verify ignitor current. After the verification, the gas valve will open, allowing gas to enter the burner. 7. After an additional 1 second, the ignition control board will monitor the flame sense probe to confirm a flame is present. If a flame is not verified within 4 seconds, the gas valve is immediately closed, and the ignition control board will return to step 2, unless jumper J30 is in place (ON), see figure 2. perature is reached, and the thermostat circuit opens. At that point, the gas valve is closed and the control enters the post-purge and post-circulating cycles. 9. The combustion blower will run for a 25 second post purge cycle. When the post purge cycle is complete, the blower is de-energized and will coast to a stop. The circulating pump will continue with the post-circulate cycle for the selected amount of time, factory default is 45 seconds. See circulating pump adjustment procedure on page 5 and 6 of this manual. 10. The control now enters the idle state while continuing to monitor temperature and the state of other system devices. If the outlet temperature drops below the set-point value minus the switching differential, and the thermostat circuit or tank probe circuit closes, the control will automatically return to step 2 and repeat the entire operating cycle. During this idle state, if the control detects an improper operating state for external devices such as the ECO switch, air pressure switch, gas pressure switch, etc., the appropriate LED(s) on the Display Board will illuminate indicating the nature of the fault. DIA-SCAN II DISPLAY BOARD OPERATING PROCEDURES The Display Board provides a user-friendly interface to the WHC1502 Ignition Control Board. With the Display Board, the user can control appliance functions and view the overall operating status of the appliance. If an error condition occurs, the Display Board will scroll a message across the LED display, indicating the error code. Under normal operating conditions, the four digit LED display on the Display Board will continuously illustrate the water temperature sensed at temperature probe #1 (Outlet). The push buttons on the Display Board allow the user to program and view the desired water temperature set point. The Display Board is connected to the Ignition Control Board through a 6 conductor cable assembly with modular plug terminations. In addition, an 8 conductor modular jack on the Display Board allows for connecting a remote display board. When power is applied to the WHC1502 System, the Display Board will initially run through a self-diagnostic test, and then display the Outlet temperature. To display a specific setting or temperature, press the SELECT push...

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