4 minutes ago, ScotsGuy said:

Can i remove the 12v and 0v wires on the 'bus' connection inside the main box without disconnecting the main power?

 

Yes, some wouldn't recommend it but will save the external bell from sounding.

 

5 minutes ago, ScotsGuy said:

Also i note about not shorting the 12v/0v wires - how would that happen?

 

As above it won't if you disconnect the wires at the main box first

Hi All,

 

So i have the required parts now.  I managed to get another 9930 keypad as a temporary measure so will put this in until i can upgrade to the newer keypad. One question i have is :

 

Do i need to disconnect the 12v and 0v wires from inside the panel first or can i just remove the 4 wires going to the old keypad and connect straight into the new keypad without opening the panel box up?  I suspect there might be an issue doing it this way (is that what you meant by shorting the cables). 

 

Thanks for your reply in advance....

If you know what your doing just sawp it live

 

Otherwise disconnect all four from panel , it's easy to take off 12v at PC end and still make a mistake 

 

You have fire extinguisher nearby?