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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. The LED display will show the current set-point temperature. 3. Press and hold the ADJUST push-button. The displayed temperature will either increase or decrease. To alternate between increasing or decreasing the temperature, release then press and hold the ADJUST push-button. 4. When the desired set-point temperature is reached, release the ADJUST push-button. 5. Press the ENTER/RESET push-button once, this enters the selected set-point temperature into controller memory. 6. The appliance will now control the temperature to the desired set-point value. NOTE: The boiler must complete a full cycle in order for the new setting to take effect. If the unit is turned off prior to a complete cycle the setting will be lost and the previous setting will remain in effect. If the ADJUST push-button is held down long enough, the set-point will reach 110°F, the minimum value (or 240°F, the maximum value) and stop. At this point, if the desired set-point is not obtained, release the ADJUST push-button and depress it again. The set-point value will now restart at 110°F (240°F) and once again increase (decrease) in value for as long as the ADJUST push-button is pressed. Switching Differential Adjustment Procedure To facilitate proper operation and maximize appliance performance, the control has a programmable operating switching differential or "hysteresis" about the set point. This means a call for heat will become active when the water temperature measured at the outlet temperature sensing probe (Prob...

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