Viking C-4000 250-Unit Apartment Entry System 4 Entry Points

Viking Electronics C-4000 Apartment and Office Entry System Controller

Overview

The Viking Electronics C-4000 is a 250-unit door entry system controller built for apartment complexes, office suites, and multi-tenant facilities that need reliable telephone-based access without a dedicated IP infrastructure. The C-4000 converts up to four standard touch-tone phones into multi-number auto-dialers, storing up to 250 resident or tenant telephone numbers in non-volatile memory — meaning programmed data survives power loss without a battery backup. At its core, this is a DTMF-based intercom and relay controller: a visitor dials a directory code, the system calls the tenant's phone, and the tenant presses a tone to release the door. No app, no cloud subscription, no managed service required.

If you're managing a property where simplicity of operation matters more than smartphone integration, and where the maintenance staff doesn't want to troubleshoot software updates at 11pm, the C-4000 fits that brief cleanly. It handles up to four entry points simultaneously — front lobby, side entrance, parking gate, and a fourth controlled point — all from a single controller chassis.

Key Features

• 250 Tenant Entries in Non-Volatile Memory: All 250 telephone numbers and entry codes are stored in non-volatile memory, so a power outage doesn't wipe your tenant database. For a 200-unit apartment building, this means no re-programming after a breaker trip — a real operational concern for property managers.
• Four Independent Entry Points: The C-4000 supports up to four entry points with independent relay control at each. Each relay is rated at 5 Amps @ 30V DC / 250V AC — enough to drive most electric strikes, magnetic locks, and gate operators directly without an intermediate relay board.
• 250 Programmable Entry Codes for Keyless or Proximity Card Entry: Each of the 250 entry codes can be used for keyless entry or paired with a proximity card reader. This makes it practical to issue a unique code to every resident rather than sharing a single building-wide PIN, which is an audit and accountability issue on most shared-code systems.
• Wiegand Input with Tiered Run Distances: Proximity reader integration uses standard Wiegand protocol. Maximum Wiegand run distances vary by port: PRx-1 supports up to 305m, PRx-2 up to 91m, PRx-3 up to 305m, and PRx-4 up to 610m. That 610m ceiling on PRx-4 is meaningful for large campuses or properties where the reader is at a parking gate far from the controller panel.
• LOG BUS Run Up to 1,610m: The LOG BUS backbone extends up to 1,610 meters, supporting distributed entry point deployments across large facilities without signal degradation concerns.
• 120V AC Input, 13.8V DC Output: Powered directly from a standard 120V AC outlet and outputs 13.8V DC at 1.25A for peripheral devices. The talk battery output is 32V DC nominal — the right voltage for powering the intercom communication path on standard telephone-based door entry wiring.
• DTMF Dialing at 120ms/100ms Timing: DTMF dialing is tuned to 120ms on / 100ms off — compatible with virtually all PSTN and VoIP systems that accept DTMF. This matters in mixed environments where some tenants use VoIP lines with varying tone sensitivity.
• Customer Data Cloning via PC: Programming data stored in one C-4000 can be read and downloaded to a second unit using a PC. For property management companies running multiple buildings with the same tenant structure, this eliminates the need to re-enter 250 entries manually at each site — a significant time saving during rollouts.
• Operating Range 0°C to 32°C, 5%–95% Non-Condensing Humidity: Rated for interior installations in temperature-controlled lobbies and utility rooms. This is not an outdoor-rated enclosure — plan for a weatherproof housing or interior placement if the controller is near an exterior entry point.

Integration and Compatibility

The C-4000 integrates with standard Wiegand-protocol proximity card readers across all four entry points, making it compatible with the broad ecosystem of 26-bit Wiegand readers from major access control hardware manufacturers. The relay outputs at 5A / 30V DC / 250V AC are directly compatible with the majority of commercial electric strikes and electromagnetic locks without additional relay boards.

The system operates over standard POTS telephone lines or compatible VoIP lines that pass DTMF tones. If your property has already migrated to a hosted VoIP PBX, verify that the provider passes DTMF in-band — most do, but some SIP trunks using RFC 2833 out-of-band DTMF require configuration at the PBX to ensure door-release tones are recognized.

For multi-building deployments, the PC-based data cloning capability (C-4000 to C-4000 via PC) reduces commissioning time materially. Explore the full Viking Electronics intercom and entry system line for compatible directory panels, handsets, and expansion hardware.

Frequently Asked Questions

Q: How many tenants and entry codes does the C-4000 support?

A: The C-4000 stores up to 250 telephone numbers and supports up to 250 individual entry codes, each assignable to a unique resident or staff member.

Q: Does the C-4000 support proximity card readers?

A: Yes. The C-4000 supports Wiegand-protocol proximity card readers on all four entry point ports. Maximum Wiegand cable run lengths vary by port: PRx-1 up to 305m, PRx-2 up to 91m, PRx-3 up to 305m, and PRx-4 up to 610m.

Q: What happens to stored programming data if power is lost?

A: Tenant telephone numbers and entry codes are stored in non-volatile memory, so programmed data is retained through power outages without any battery backup requirement.

Q: Can the C-4000 be used outdoors?

A: The C-4000 itself is rated for interior use (0°C to 32°C operating temperature). For outdoor or vestibule installations, it requires a separate weatherproof enclosure. The Wiegand readers connected to its ports can be outdoor-rated units.

Q: What is the warranty on the C-4000?

A: The C-4000 carries a two-year limited manufacturer warranty.

Q: Can programming be copied from one C-4000 unit to another?

A: Yes. Customer programming data stored in one C-4000 can be read and downloaded to a second C-4000 unit using a PC, which simplifies multi-site deployments.

Eden Phillips

The spec I keep coming back to on the C-4000 is the PRx-4 Wiegand run distance of 610 meters. Most entry controllers cap Wiegand at 150–200 feet and leave you running additional wire infrastructure or repeaters for anything beyond that. At 610m on port 4, you can reach a parking gate at the far end of a mid-size apartment complex from a single controller without any amplification hardware — that changes the wiring budget on larger properties significantly.

Technical Highlights:

• Non-Volatile Memory for 250 Entries: No battery-backed RAM, no capacitor, no risk of losing your entire tenant directory on a power event. On a 200-unit property that took hours to program, this is not a minor detail.
• Relay Rating 5A @ 30V DC / 250V AC: Drives most commercial electric strikes and mag-lock hardware directly. You don't need to add a relay board between the C-4000 and the hardware at the door frame — simplifies the panel wiring and reduces a potential failure point.
• DTMF Timing 120ms on / 100ms off: This is tuned tightly enough to work reliably with most VoIP lines, but you'll still want to confirm your SIP provider passes in-band DTMF before commissioning. RFC 2833 out-of-band configurations at the PBX will need a setting change.

Deployment Considerations:

• The C-4000's operating temperature ceiling is 32°C — plan its placement in a conditioned utility room or interior panel closet. A mechanical room that hits 40°C in summer is not a suitable install location without active cooling.
• PRx-2 has a significantly shorter Wiegand run limit at 91m compared to the other three ports (305m / 305m / 610m). Assign PRx-2 to your closest reader — typically an interior stairwell or elevator lobby — and reserve PRx-4 for the most distant point.

The C-4000 (often searched as C 4000) is the right controller for a 100–250 unit apartment building or multi-tenant office complex that wants telephone-based entry with proximity card support, doesn't need cloud management, and needs to cover four physically separated entry points from a single panel — particularly when one of those points is a distant parking gate or loading dock.