RTNI

I have recently installed a scantronic 9751 with hardwired expander (13 zones in total) and all is going well with the exception of reporting a mains failure. This is a bells only setup, no monitoring and it takes about 15 mins from when the mains power goes off to the keypad reporting the alert lamp being lit. On a previous 9651 system this was reported immediately. In the programming manual I can't see anything about setting a delay up - can anyone help me out with this? Additionally, several times I have come home and the alarm has gone off during the day (I know why it went off - it was a mistake on my part). When entering, the old 9651 system used to sound the internal speaker and external bex box as soon as PiR was tripped, but on the 9751 this is not the case. Even the manual says "if the alarm sounds when you enter the premises then an intruder may be present." The alert lamp is lit to indicate the alarm went off but how do I restore the immediate alarm on entry to signify an alarm condition when returning to the premises? Many thanks.