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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-button until the appropriate LED is illuminated (see figure 1). After 5 seconds, the Display Board will automatically revert to displaying the Outlet temperature. Pressing the ENTER/RESET push-button will hold the display in the indicated mode until the SELECT push-button is pressed. With the Display Board, the user can make adjustments to many of the appliance’s control features. This includes the following: Options/Features Setting Procedures • Set Appliance Temperature Set-point Value • Set Appliance Switching Differential Value • Select Appliance Post-Circulate Time • Set Appliance Circulating Pump to Continuous ON Mode • Check Appliance Cycle Count • Control the water temperature in a storage tank 4 Figure 1. Dia-Scan II Display Board. Green Status Lights LED 1: Call for Heat LED 2: Flow Switch LED 3: Pressure Switch LED 4: Ignitor Current LED 5: Gas Valve LED 6: Flame Sense Red Fault Lights LED 7: Ignition Fail LED 8: Circulate Failure LED 9: Blower Failure LED 10: Blocked Inlet LED 11: Blocked Flue Water Temperature Set Lights LED 12: Inlet Water Temperature * LED 13: Outlet Water Temperature LED 14: Inlet/Outlet Differential Temperature LED 15: Set-Point Temperature LED 16: Outlet/Set-Point Differential Temperature * Defaults to tank probe temperature when tank probe is used. Temperature Set-point Adjustment Procedure The control board has a standard programmable temperature set- point range of 110°F to 240°F. The user can easily change the temperature set-point at any time by using the following procedure. In all cases, the boiler must be energized. The factory default setting is 180°F. To change or view the current programmed temperature set-point value: 1. Press the SELECT push-button on the display board until both the Set-Pt LED (LED 15, see figure 1) and Outlet Water Temperature LED (LED 13, see figure 1) are illuminated. 2...

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