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Hersteller: Crown Dateigröße: 550.11 kb Dateiname: Unterrichtssprache:

3 ELECTRONIC HOT SURFACE 8. If a flame is confirmed, the control will enter the heating IGNITION CONTROL BOARD mode where it will continue heating until the set-point tem- ALL MODELS -The WHC1502 ignition control board is a fully integrated, state of the art electronic control system. The ignition control board includes a microprocessor, which governs all temperature and ignition control functions for the appliance. Inherent in the design are the normal operating sequences and safety features associated with a gas ignition control system. The ignition control continuously performs various diagnostic tests to verify proper appliance and control operation. Should an unsafe condition occur, the control will shut down the burner and illuminate the appropriate diagnostic indicators on the Display Board, indicating a need for service. All operating programs are stored in permanent memory on the ignition control and a second programmable memory is used for retaining user-specific operating parameters in the event main power is ever interrupted. Line Polarity Indicator A green LED is mounted on the ignition control to indicate line voltage polarity is properly connected. When 120 VAC input power is properly connected to the Ignition Control Board, the green LED will illuminate. If an error is made when connecting 120 VAC input power, this LED will not light. Improperly connecting the input power may result in a false flame sensor failure. Fuse Protection The 24 VAC circuitry is protected with a 3 amp auto fuse. If the fuse opens, a red LED located near the fuse will light. If the red LED is illuminated, replace the fuse (recommended replacement part is Little fuse p/n 257003 automotive fuse). Repeated failure of the fuse is an indication of possible damage to the ignition control board. NOTE: One extra fuse is supplied with the boiler. Typical Control/Appliance Operating Sequence 1. When power is applied to the WHC1502 ignition control, the Display board will initially run through a self-diagnostic routine, and then go into its operating mode, displaying the temperature sensed at temperature probe #1 (Outlet). 2. If the ignition control board determines the actual outlet water temperature at the temperature sensing probe (probe #1) is below the programmed temperature set-point less the switching differential, and the thermostat circuit or tank probe circuit closes, call for heat is activated. 3. The ignition control board then performs selected system diagnostic checks. This includes confirming the proper state of the ECO/High Limit device, flow switch, and pressure switches. 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, allowi...

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