Older buildings might not follow standard color codes. Always mark your wires (e.g., "1-White," "6-Blue") before disconnecting the old unit. 3. Installation Steps for Urmet 1131
The Complete Urmet 1131 Door Phone Installation and Wiring Guide urmet 1131 manual full
: Primarily 4+n systems (4 common wires + 1 individual call wire per apartment). Older buildings might not follow standard color codes
Dedicated button for unlocking the entrance door. urmet 1131 manual full