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• The Comelit 2602/2602u “Style” is a universal 4 + n (usually 5-wire) analog handset.
• Its terminal designations are:
A = Door-lock (P1) B = Speech-out / Microphone (2)
C = Common (0 V reference) D = Call (electronic or buzzer) E = Speech-in / Earpiece (3)
• If your previous handset used the blue/white-blue and orange/white-orange pairs, you must map those conductors to the above functions before reconnecting; wire colours are NOT standardised.
• Once each conductor is identified, connect:
Common → C Speech-in → E Speech-out → B Call → D Door-lock → A (plus link to C1 if required).
• Set jumpers: JPC (common polarity), JPR (AC-buzz vs electronic), JPS (mic type).
• After wiring, power up, verify speech both ways, ring, and electric-strike operation.
Why “universal” matters
Comelit 2602u is intended to replace many 4 + n handsets from Fermax, Urmet, Golmar, Buss, etc. “n” is the number of call wires (normally one per flat). Audio (2 wires), common, call, and lock add up to five. Because legacy brands labelled terminals differently (T/R, 1/2/3, +/-, etc.) and installers often used random colours, positive identification is essential.
Terminal functions in detail
• A (or P1) — Door-release contact. Internally a push-button shorts A to C (or to C1 via on-board link). Carries 8–15 V DC/AC, ≤ 1 A typical.
• B (term. 2) — Speech-out. Carries microphone audio (~300 mV pp).
• C (term. 3) — Common return for audio, call and lock. Usually 0 V but can be +V on positive-common systems.
• D (CA) — Call wire. Either:
– AC (≈12 V AC) to energise buzzer → set JPR to “AC”
– DC (≈6–15 V DC) for electronic tone → JPR to “EL”
• E (term. 1, sometimes marked 3) — Speech-in. Carries speaker signal (~0.5 W max).
Configuration jumpers/pots
JPC Positive vs negative common
JPR AC-buzzer vs electronic tone
JPS Carbon vs electret microphone
TRIM-MIC / TRIM-SPK Level pots for balanced audio
Identifying the building wires
Method A – referencing the old handset
• Photograph or mark each wire before removal.
• Transcribe old labels to Comelit equivalents using table:
| Old label | Typical brand | Comelit 2602 |
|---|---|---|
| T / MIC | Urmet | B |
| R / SPK | Urmet | E |
| C / 0 | Urmet | C |
| Z / LL | Urmet | D |
| AP / P | Urmet | A |
Method B – multimeter when old unit is absent
a. Find Common: measure each conductor pair; the one that yields a steady reference to most others (0 V or supply rail) is C.
b. Locate Call: have an assistant press the panel button while probing; the wire that toggles to 8–15 V (AC or DC) is D.
c. Audio pair: remaining two wires showing 6–12 V DC between each other (or to common) are B/E. If Tx/Rx swapped you will hear but not be heard—just reverse.
d. The last unused conductor is typically A (lock). Confirm by observing voltage only while handset button is pressed.
Recommended Cat-5 mapping (if you re-terminate):
Blue → C Blue/White → E Orange → B Orange/White → D Green → A
| Function | Expected symptom | Diagnostic if failed |
|---|---|---|
| Speech both ways | Clear audio | Swap B/E; adjust pots; check JPS |
| Ring | Tone/Buzzer sounds | Wrong D; wrong JPR; missing common |
| Door unlock | Strike clicks | Wrong A; missing link to supply; relay in PSU defective |
• Analog 4 + n is being replaced by 2-wire digital systems (e.g., Comelit SimpleBus, SBTOP) or IP-based (ViP, SIP).
• Many manufacturers still sell universal analog handsets because retro-fits in existing cabling remain cost-effective.
• Regulations (EU EN 50486) increasingly require low-power standby and privacy muting—2602u meets these via a three-position volume/privacy slider.
• Migration kits: Comelit now offers SimpleKey and Multiuser gateways that allow existing 4 +n wiring to be upgraded to digital without changing risers.
Electrical parameters
Voltage range: 8–15 V DC/AC (supplied by system PSU)
Idle current: ≈15 mA; Call tone: ≈50 mA; Lock contact rating: 2 A @ 30 V AC/DC
Audio impedance: 600 Ω (earpiece) / 1 kΩ (mic)
Example: Swapping Urmet 1130 to Comelit 2602u
Old labels were T (orange), R (white-orange), 0 (blue), Z (white-blue), AP (green). Map as:
T → B, R → E, 0 → C, Z → D, AP → A.
Set JPR to AC (Urmet uses 12 V AC buzzer). Works first time.
• Low-voltage door-entry work is generally exempt from high-voltage electrical licensing but local regulations (e.g., BS 7671 Part P in UK) still mandate competence and safe isolation.
• Mis-wiring a common-bus system can disable service for neighbours; keep loop-through joins intact.
• Door-entry systems handle personal access—ensure lock wiring cannot be shorted to open the door inadvertently (fit tamper-resistant back-plates, hide jumpers).
• Privacy: leaving the handset off-hook or jumpering mic permanently constitutes lawful-intercept risk; always instruct occupants about privacy switch.
Typical challenges & fixes
• “One-way audio” → reverse B and E; check mic jumper.
• “Buzz during speech” → separate speech pair from mains cable; fit ferrite.
• “No ring on AC systems” → JPR set to EL; move to AC and install piezo buzzer link.
• Colour coding above is illustrative; your installation may differ.
• Some 4-wire systems use combined speech and common returns; Comelit PCB has solder-link positions to emulate these—consult the service sheet.
• If the riser uses a “positive-common” topology (rare), move JPC to +C and transpose references. Audio will be silent if this is wrong.
• Comelit technical sheet “2602u Universal Handset” (document FN-2602U-EN-10/22).
• Intercoms-R-Us handset compatibility charts (for cross-reference with other brands).
• Study migration options to 2-wire digital (Comelit SimpleBus2) for improved noise immunity and features.
• Investigate cybersecurity aspects of IP door-entry before future upgrades.
Identify each conductor’s real function (Common, Call, Speech-in, Speech-out, Lock) before trusting colours. Terminate onto Comelit 2602u terminals A B C D E accordingly, set the three onboard jumpers, and test ring, two-way audio, and door release. Document the mapping; confirm regulations are met. This methodical approach guarantees a reliable, future-serviceable installation of the Comelit 2602 analog handset.
