Pacific 3404 Intercom

[TGH]

I am trying to figure out what technically happens when I press the door open button.
What wires does it connect to open the door?
I would somehow like to attach a remote controller to wires.
Is this possible?

 

[kellys_eye]

AC1 and D0 will be shorted to operate the door open solenoid.

You could use a wireless doorbell as a simple remote - to activate a relay with contacts connected across AC1 and D0.

 

[TGH]

My station only has four wires C Pt T B

 

[kellys_eye]

You should be able to trace the copper tracks on the printed circuit board from the 'door open' button to the appropriate terminals.