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For the new jumper setting to take effect - all 24V power to the board must be removed and reapplied. 6. Complete the installation and power up the unit, re-applying both 240V & 24V. FIGURE 1: Outdoor Unit Control Box DEFROST CURVE SELECTION When the control board is replaced, the jumper MUST be placed in a numbered position. Select the proper jumper position from Table1. If the jumper is missing or in the P position, the replacement control will not energize the compressor. When the jumper