If a door position switch (DPS) is connected across the green and white wires of the old CX (green and red of new CX) the CX would go into alarm if the door is held open when it attempts to rearm. If no DPS is used the CX will rearm when the rearm time expires regardless of door position. If the door is going to be propped open for long periods of time, the device should be turned off or externally inhibited. You can also set the CX for infinite rearm which means the door will not rearm until the door is closed. DPS is required for infinite rearm function.
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