Urmet 1131 is a classic analogue intercom handset known for its simple 4+n wiring. Since manuals for older models can be sparse, this guide compiles the essential technical and wiring details needed for installation or replacement. Core Wiring Configuration (4+n System)
Carbon capsule (older variants) or Electret capsule (newer variants) Speaker Impedance: 45 Ohms Mounting: Surface wall mount Terminal Wire Connections (The 5-Wire Standard)
Installing the Urmet 1131 is straightforward. Follow these steps for a typical 4+N system. Tools Needed: Small Flathead Screwdriver Wire Stripper/Cutter Pencil/Marker (to label wires) Drill (if new wall mounting is required) Step-by-Step Installation: urmet 1131 manual full
Single door-release button (Auxiliary buttons can be added) Buzzer Rating: 12V AC traditional mechanical buzzer Urmet 1131 Terminal Block Connections (Pinout)
Ensure the power to the intercom system is disconnected at the main building breaker if possible, or exercise caution if working with low voltage. Urmet 1131 is a classic analogue intercom handset
To wire or replace an Urmet 1131 handset, you must understand the numbering system on the internal terminal block. Open the casing by pressing the release tab at the bottom to reveal the following terminals: Terminal Number Function / Description Speaker (Voice coming from the outdoor entry panel) Terminal 2 Microphone (Voice going to the outdoor entry panel) Terminal 6 Common Ground (Earth / Negative) Terminal 7 Call Signal (Buzzer or Electronic chime input) Terminal 9 Door Lock Release (Triggers the electric latch) Auxiliary Terminals (If Expanded)
4+n analog systems (meaning 4 common wires plus 1 call wire per apartment). Compatibility: Follow these steps for a typical 4+N system
Short out Terminal 6 and Terminal 9 with a small piece of insulated wire. If the door opens, the handset button is faulty. If it does not open, the issue lies in the building's central power supply or external lock wiring. Issue 3: Low Volume or High-Pitched Screeching (Feedback)