LG PACS4B000 AC Smart IV Central Controller VRF 10.2″ Touch Screen

LG PACS4B000 AC Smart IV Central Controller VRF 10.2″ Touch Screen

The LG PACS4B000 AC Smart IV is a standalone central HVAC controller built to manage multi-zone Variable Refrigerant Flow (VRF) and commercial air conditioning networks. Featuring an ARM Cortex-A8 800 MHz processor paired with a 10.2-inch WSVGA (1024 × 600) TFT LCD capacitive/resistive touch screen, the unit provides localized graphical floor-plan monitoring and remote web-server access without requiring a dedicated continuously running PC.

The PACS4B000 coordinates up to 128 indoor units over dual RS-485 V-Net communication buses while supporting local dry-contact interlocking for emergency shutdown and external plant alarms.

Model Details

• Manufacturer: LG Electronics
• Series / Product Line: AC Smart IV (4th Generation Central Control Platform)
• Manufacturer Part Number (MPN): PACS4B000
• Primary Installation Manual P/N: MFL68463901 / MFL69150602
• GUI User Manual P/N: MFL68128402
• Quick Reference Guide P/N: MFL68525003

Electrical Ratings & Terminal Allocations

• AC Supply Option: 24 VAC, 50/60 Hz, 850 mA nominal current draw (22 VA maximum power consumption). Must be supplied by a dedicated insulating Class 2 transformer compliant with IEC 61558-2-6 and NEC Class 2.
• DC Supply Option: 12 VDC, 3.33 A (40 W max) via external AC/DC switching power adapter (100–240 VAC, 50/60 Hz, 1.2 A input). Note: North American market packages require separate sourcing of the 24 VAC Class 2 transformer or 12 VDC adapter.

Technical Details

Features

1. High-Capacity Multi-Zone Node Management: Controls and monitors up to 128 individual devices (or 64 HVAC units paired with up to 9 external ACS I/O modules for 130 total I/O points) across 16 Multi V outdoor systems.
2. Standalone Web Server & Floor-Plan GUI: Built-in web server allows authorized operators to monitor zone temperatures, fan speeds, and fault codes via standard desktop browsers without external server software.
3. 200-Event Programmable Scheduler: Automates operational modes (Auto/Cool/Dry/Heat/Fan), dual-setpoint auto-changeover, unoccupied setback limits, and local wall-thermostat lockouts across daily, weekly, and holiday calendars.
4. Hardware & Software Interlocking: Executes automated conditional logic between onboard DI/DO terminals, VRF indoor units, and third-party auxiliary equipment such as exhaust fans and booster pumps.
5. Full-Screen Red Alert Emergency Override: Immediately locks out standard user controls and displays a full-screen visual alarm upon receiving an emergency stop or critical system fault trigger.

Part Number Cross-References

• Direct Successor / Upgrade Model: LG PACS5A000 (AC Smart 5) — Current-generation 10.2″ touchscreen replacement offering backward compatibility with Multi V V-Net buses and expanded BACnet IP / Modbus TCP gateway capabilities.
• Headless Din-Rail / Rack Alternative: LG PACP4B000 (ACP IV) — Advanced Control Platform IV offering identical web-based management for up to 256 units without an integrated LCD touchscreen.
• Legacy Predecessor Models: Replaces PQCSW320A1E and PBACNA000 central control interfaces in legacy Multi V installations.

Applications

• Marine & Offshore Accommodation HVAC: Centralized bridge or engine control room (ECR) climate supervision for cruise vessels, offshore supply vessels (OSVs), and accommodation barges utilizing LG Multi V marine-treated VRF systems.
• Commercial Office Towers & Retail Complexes: Multi-tenant scheduling, remote setpoint restriction, and energy distribution tracking.
• Hospitality & Institutional Facilities: Hotels, universities, and healthcare clinics requiring centralized unoccupied setback and fire-alarm forced shutdown interlocking.
• Industrial Control Rooms & Data Centers: Duty/standby rotation interlocking and fault email alerting for mission-critical equipment cooling.

Frequently Asked Questions

Can the LG PACS4B000 operate on 12 VDC battery-backed control circuits?

Yes. In addition to 24 VAC (50/60 Hz, 850 mA), the PACS4B000 accepts a regulated 12 VDC (3.33 A) input. Ensure the DC supply is filtered and isolated from noisy inductive loads if powered from a 24V/12V marine DC-DC converter bank.

What is the difference between RS-485 CH1 and CH2 on the PACS4B000?

CH1 is dedicated to Air Handling Unit (AHU) communication kits, whereas CH2 handles standard V-Net devices including Multi V indoor units, outdoor units (via PI485), Energy Recovery Ventilators (ERV), and ACS I/O expansion modules.

Does the PACS4B000 require a separate computer to run schedules and web access?

No. The unit has an embedded ARM Cortex-A8 processor, 4 GB of internal iNAND flash memory, and a built-in web server. All 200 scheduled events, floor-plan graphics, and interlocking routines execute locally on the controller even if external network connections are offline.

Is the LG PACS5A000 a direct drop-in replacement for a failed PACS4B000?

Yes. The LG PACS5A000 (AC Smart 5) is the official OEM successor to the PACS4B000. It supports the same 128-unit V-Net architecture and 24 VAC / 12 VDC power requirements while adding native BACnet IP and Modbus TCP support for modern building management systems.

How many PACS4B000 controllers can be connected to the same V-Net bus?

A maximum of two central controllers can reside on a single V-Net communication network, provided they are assigned distinct controller addresses and polled without bus arbitration conflicts.