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Scantronic 9800 - How do I replace a PIR?

One of my PIRs is not working after it has been moved because of some building work and I need to replace it. I think I can cope with the wiring but I need some advice on how to disconnect the old one and reconnect the new one without the alarm going haywire. Is there a process that I need to follow when working on the system to put it into some sort of maintenance mode to prevent the alarm triggering? I would be grateful for any advice and help.
Patrick
Patrick, March 2011
Do I need to disconnect the battery or turn the alarm off before I proceed? Does keying in the engineering code stop the alarm from going off?
thanks

Patrick, April 2011
... & don't blow a fuse

acorn, March 2011
key in the engineering code,then you will be able to remove the sensor

gts, March 2011
link Click here to see other fixes for Scantronic 9800.