How can I re-set my veritas 8?

Just moved into a new house, whilst I was at work my partner knocked into the key panel which set the alarm off. There is no code set yet because we are the first people to live here. There is also no contact number for the alarm. I had to disconnect it from the mains and disconnect the battery. When I power it back up the key panel beeps 3 times every couple of seconds. How do I get the alarm up and running so I can put my own number in